ref: 97ab532bc05a545a3606cf33662008b971358b5a
parent: b5ec4491b729182ccfdf131da5acb75cf22ae678
author: Timothy B. Terriberry <tterribe@xiph.org>
date: Sun Sep 16 11:19:26 EDT 2012
Initial code import. Seeking and playback work, at least as far as the examples test them. There are probably still lots of bugs.
--- /dev/null
+++ b/examples/opusfile_example.c
@@ -1,0 +1,198 @@
+/*For fileno()*/
+#if !defined(_POSIX_SOURCE)
+# define _POSIX_SOURCE 1
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#if defined(_WIN32)
+/*We need the following two to set stdin/stdout to binary.*/
+# include <io.h>
+# include <fcntl.h>
+#endif
+#include <opus/opusfile.h>
+
+/*Matrices for downmixing from the supported channel counts to stereo.*/
+static const float DOWNMIX_MATRIX[8][8][2]={+ /*mono*/
+ {+ {1.F,1.F}+ },
+ /*stereo*/
+ {+ {1.F,0.F},{0.F,1.F}+ },
+ /*3.0*/
+ {+ {0.5858F,0.F},{0.4142F,0.4142F},{0,0.5858F}+ },
+ /*quadrophonic*/
+ {+ {0.4226F,0.F},{0,0.4226F},{0.366F,0.2114F},{0.2114F,0.336F}+ },
+ /*5.0*/
+ {+ {0.651F,0.F},{0.46F,0.46F},{0,0.651F},{0.5636F,0.3254F},{0.3254F,0.5636F}+ },
+ /*5.1*/
+ {+ {0.529F,0.F},{0.3741F,0.3741F},{0.F,0.529F},{0.4582F,0.2645F},+ {0.2645F,0.4582F},{0.3741F,0.3741F}+ },
+ /*6.1*/
+ {+ {0.4553F,0.F},{0.322F,0.322F},{0.F,0.4553F},{0.3943F,0.2277F},+ {0.2277F,0.3943F},{0.2788F,0.2788F},{0.322F,0.322F}+ },
+ /*7.1*/
+ {+ {0.3886F,0.F},{0.2748F,0.2748F},{0.F,0.3886F},{0.3366F,0.1943F},+ {0.1943F,0.3366F},{0.3366F,0.1943F},{0.1943F,0.3366F},{0.2748F,0.2748F}+ }
+};
+
+int main(int _argc,const char **_argv){+ OggOpusFile *of;
+ ogg_int64_t pcm_offset;
+ ogg_int64_t nsamples;
+ int ret;
+ int prev_li;
+#if defined(_WIN32)
+# undef fileno
+# define fileno _fileno
+ /*We need to set stdin/stdout to binary mode. Damn windows.*/
+ /*Beware the evil ifdef. We avoid these where we can, but this one we
+ cannot.
+ Don't add any more.
+ You'll probably go to hell if you do.*/
+ _setmode(fileno(stdin),_O_BINARY);
+ _setmode(fileno(stdout),_O_BINARY);
+#endif
+ if(_argc!=2){+ fprintf(stderr,"Usage: %s <file.opus>\n",_argv[0]);
+ return EXIT_FAILURE;
+ }
+ if(strcmp(_argv[1],"-")==0){+ OpusFileCallbacks cb={NULL,NULL,NULL,NULL};+ of=op_open_callbacks(op_fdopen(&cb,fileno(stdin),"rb"),&cb,NULL,0,NULL);
+ }
+#if 0
+ /*For debugging: force a file to not be seekable.*/
+ else{+ OpusFileCallbacks cb={NULL,NULL,NULL,NULL};+ void *fp;
+ fp=op_fopen(&cb,_argv[1],"rb");
+ cb.seek=NULL;
+ cb.tell=NULL;
+ of=op_open_callbacks(fp,&cb,NULL,0,NULL);
+ }
+#else
+ else of=op_open_file(_argv[1],NULL);
+#endif
+ if(of==NULL){+ fprintf(stderr,"Failed to open file '%s'.\n",_argv[1]);
+ return EXIT_FAILURE;
+ }
+ if(op_seekable(of)){+ ogg_int64_t duration;
+ fprintf(stderr,"Total number of links: %i\n",op_link_count(of));
+ duration=op_pcm_total(of,-1);
+ fprintf(stderr,"Total duration: %f seconds (%li samples @ 48 kHz).\n",
+ duration/48000.0,(long)duration);
+ }
+ prev_li=-1;
+ nsamples=0;
+ pcm_offset=op_pcm_tell(of);
+ if(pcm_offset!=0){+ fprintf(stderr,"Non-zero starting PCM offset: %li\n",(long)pcm_offset);
+ }
+ for(;;){+ ogg_int64_t next_pcm_offset;
+ float pcm[120*48*8];
+ float stereo_pcm[120*48*2];
+ int nchannels;
+ int li;
+ int i;
+ ret=op_read_float(of,pcm,sizeof(pcm)/sizeof(*pcm),&li);
+ if(ret<0){+ fprintf(stderr,"Error decoding '%s': %i\n",_argv[1],ret);
+ ret=EXIT_FAILURE;
+ break;
+ }
+ if(li!=prev_li){+ const OpusHead *head;
+ const OpusTags *tags;
+ int ci;
+ /*We found a new link.
+ Print out some information.*/
+ fprintf(stderr,"Decoding link %i:\n",li);
+ head=op_head(of,li);
+ fprintf(stderr," Channels: %i\n",head->channel_count);
+ if(op_seekable(of)){+ ogg_int64_t duration;
+ duration=op_pcm_total(of,li);
+ fprintf(stderr," Duration: %f seconds (%li samples @ 48 kHz).\n",
+ duration/48000.0,(long)duration);
+ }
+ if(head->input_sample_rate){+ fprintf(stderr," Original sampling rate: %lu Hz\n",
+ (unsigned long)head->input_sample_rate);
+ }
+ tags=op_tags(of,li);
+ fprintf(stderr," Encoded by: %s\n",tags->vendor);
+ for(ci=0;ci<tags->comments;ci++){+ fprintf(stderr," %s\n",tags->user_comments[ci]);
+ }
+ fprintf(stderr,"\n");
+ if(!op_seekable(of)){+ pcm_offset=op_pcm_tell(of)-ret;
+ if(pcm_offset!=0){+ fprintf(stderr,"Non-zero starting PCM offset in link %i: %li\n",
+ li,(long)pcm_offset);
+ }
+ }
+ }
+ next_pcm_offset=op_pcm_tell(of);
+ if(pcm_offset+ret!=next_pcm_offset){+ fprintf(stderr,"PCM offset gap! %li+%i!=%li\n",
+ (long)pcm_offset,ret,(long)next_pcm_offset);
+ }
+ pcm_offset=next_pcm_offset;
+ if(ret<=0){+ ret=EXIT_SUCCESS;
+ break;
+ }
+ /*Downmix to stereo so we can have a consistent output format.*/
+ nchannels=op_channel_count(of,li);
+ if(nchannels<0||nchannels>8){+ fprintf(stderr,"Unsupported channel count: %i\n",nchannels);
+ ret=EXIT_FAILURE;
+ break;
+ }
+ for(i=0;i<ret;i++){+ float l;
+ float r;
+ int ci;
+ l=r=0.F;
+ for(ci=0;ci<nchannels;ci++){+ l+=DOWNMIX_MATRIX[nchannels-1][ci][0]*pcm[i*nchannels+ci];
+ r+=DOWNMIX_MATRIX[nchannels-1][ci][1]*pcm[i*nchannels+ci];
+ }
+ stereo_pcm[2*i+0]=l;
+ stereo_pcm[2*i+1]=r;
+ }
+ if(!fwrite(stereo_pcm,sizeof(*stereo_pcm)*2,ret,stdout)){+ fprintf(stderr,"Error writing decoded audio data: %s\n",strerror(errno));
+ ret=EXIT_FAILURE;
+ break;
+ }
+ nsamples+=ret;
+ prev_li=li;
+ }
+ op_free(of);
+ if(ret==EXIT_SUCCESS){+ fprintf(stderr,"Done (played %li samples).\n",(long)nsamples);
+ }
+ return ret;
+}
--- /dev/null
+++ b/examples/seeking_example.c
@@ -1,0 +1,406 @@
+/*For fileno()*/
+#if !defined(_POSIX_SOURCE)
+# define _POSIX_SOURCE 1
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <math.h>
+#include <string.h>
+#if defined(_WIN32)
+/*We need the following two to set stdin/stdout to binary.*/
+# include <io.h>
+# include <fcntl.h>
+#endif
+#include <opus/opusfile.h>
+
+/*Use shorts, they're smaller.*/
+#define OP_FIXED_POINT (1)
+
+#if defined(OP_FIXED_POINT)
+
+typedef opus_int16 op_sample;
+
+# define op_read_native op_read
+
+/*TODO: The convergence after 80 ms of preroll is far from exact.
+ Our comparison is very rough.
+ Need to find some way to do this better.*/
+# define MATCH_TOL (16384)
+
+# define ABS(_x) ((_x)<0?-(_x):(_x))
+
+# define MATCH(_a,_b) (ABS((_a)-(_b))<MATCH_TOL)
+
+/*Don't have fixed-point downmixing code.*/
+# undef OP_WRITE_SEEK_SAMPLES
+
+#else
+
+typedef float op_sample;
+
+# define op_read_native op_read_float
+
+/*TODO: The convergence after 80 ms of preroll is far from exact.
+ Our comparison is very rough.
+ Need to find some way to do this better.*/
+# define MATCH_TOL (16384.0/32768)
+
+# define FABS(_x) ((_x)<0?-(_x):(_x))
+
+# define MATCH(_a,_b) (FABS((_a)-(_b))<MATCH_TOL)
+
+# if defined(OP_WRITE_SEEK_SAMPLES)
+/*Matrices for downmixing from the supported channel counts to stereo.*/
+static const float DOWNMIX_MATRIX[8][8][2]={+ /*mono*/
+ {+ {1.F,1.F}+ },
+ /*stereo*/
+ {+ {1.F,0.F},{0.F,1.F}+ },
+ /*3.0*/
+ {+ {0.5858F,0.F},{0.4142F,0.4142F},{0,0.5858F}+ },
+ /*quadrophonic*/
+ {+ {0.4226F,0.F},{0,0.4226F},{0.366F,0.2114F},{0.2114F,0.336F}+ },
+ /*5.0*/
+ {+ {0.651F,0.F},{0.46F,0.46F},{0,0.651F},{0.5636F,0.3254F},{0.3254F,0.5636F}+ },
+ /*5.1*/
+ {+ {0.529F,0.F},{0.3741F,0.3741F},{0.F,0.529F},{0.4582F,0.2645F},+ {0.2645F,0.4582F},{0.3741F,0.3741F}+ },
+ /*6.1*/
+ {+ {0.4553F,0.F},{0.322F,0.322F},{0.F,0.4553F},{0.3943F,0.2277F},+ {0.2277F,0.3943F},{0.2788F,0.2788F},{0.322F,0.322F}+ },
+ /*7.1*/
+ {+ {0.3886F,0.F},{0.2748F,0.2748F},{0.F,0.3886F},{0.3366F,0.1943F},+ {0.1943F,0.3366F},{0.3366F,0.1943F},{0.1943F,0.3366F},{0.2748F,0.2748F}+ }
+};
+
+static void write_samples(float *_samples,int _nsamples,int _nchannels){+ float stereo_pcm[120*48*2];
+ int i;
+ for(i=0;i<_nsamples;i++){+ float l;
+ float r;
+ int ci;
+ l=r=0.F;
+ for(ci=0;ci<_nchannels;ci++){+ l+=DOWNMIX_MATRIX[_nchannels-1][ci][0]*_samples[i*_nchannels+ci];
+ r+=DOWNMIX_MATRIX[_nchannels-1][ci][1]*_samples[i*_nchannels+ci];
+ }
+ stereo_pcm[2*i+0]=l;
+ stereo_pcm[2*i+1]=r;
+ }
+ fwrite(stereo_pcm,sizeof(*stereo_pcm)*2,_nsamples,stdout);
+}
+# endif
+
+#endif
+
+static void verify_seek(OggOpusFile *_of,opus_int64 _byte_offset,
+ ogg_int64_t _pcm_offset,ogg_int64_t _pcm_length,op_sample *_bigassbuffer){+ opus_int64 byte_offset;
+ ogg_int64_t pcm_offset;
+ ogg_int64_t duration;
+ op_sample buffer[120*48*8];
+ int nchannels;
+ int nsamples;
+ int li;
+ int lj;
+ int i;
+ byte_offset=op_raw_tell(_of);
+ if(_byte_offset!=-1&&byte_offset<_byte_offset){+ fprintf(stderr,"\nRaw position out of tolerance: requested %li, "
+ "got %li.\n",(long)_byte_offset,(long)byte_offset);
+ exit(EXIT_FAILURE);
+ }
+ pcm_offset=op_pcm_tell(_of);
+ if(_pcm_offset!=-1&&pcm_offset>_pcm_offset){+ fprintf(stderr,"\nPCM position out of tolerance: requested %li, "
+ "got %li.\n",(long)_pcm_offset,(long)pcm_offset);
+ exit(EXIT_FAILURE);
+ }
+ if(pcm_offset<0||pcm_offset>_pcm_length){+ fprintf(stderr,"\nPCM position out of bounds: got %li.\n",
+ (long)pcm_offset);
+ exit(EXIT_FAILURE);
+ }
+ nsamples=op_read_native(_of,buffer,sizeof(buffer)/sizeof(*buffer),&li);
+ if(nsamples<0){+ fprintf(stderr,"\nFailed to read PCM data after seek: %i\n",nsamples);
+ exit(EXIT_FAILURE);
+ }
+ for(lj=0;lj<li;lj++){+ duration=op_pcm_total(_of,lj);
+ pcm_offset-=duration;
+ if(pcm_offset<0){+ fprintf(stderr,"\nPCM data after seek came from the wrong link: "
+ "expected %i, got %i.\n",lj,li);
+ exit(EXIT_FAILURE);
+ }
+ _bigassbuffer+=op_channel_count(_of,lj)*duration;
+ }
+ duration=op_pcm_total(_of,li);
+ if(pcm_offset+nsamples>duration){+ fprintf(stderr,"\nPCM data after seek exceeded link duration: "
+ "limit %li, got %li.\n",duration,pcm_offset+nsamples);
+ exit(EXIT_FAILURE);
+ }
+ nchannels=op_channel_count(_of,li);
+ for(i=0;i<nsamples*nchannels;i++){+ if(!MATCH(buffer[i],_bigassbuffer[pcm_offset*nchannels+i])){+ fprintf(stderr,"\nData after seek doesn't match declared PCM "
+ "position: mismatch %G\n",
+ (double)buffer[i]-_bigassbuffer[pcm_offset*nchannels+i]);
+ for(i=0;i<duration-nsamples;i++){+ int j;
+ for(j=0;j<nsamples*nchannels;j++){+ if(!MATCH(buffer[j],_bigassbuffer[i*nchannels+j]))break;
+ }
+ if(j==nsamples*nchannels){+ fprintf(stderr,"\nData after seek appears to match position %li.\n",
+ (long)i);
+ }
+ }
+ exit(EXIT_FAILURE);
+ }
+ }
+#if defined(OP_WRITE_SEEK_SAMPLES)
+ write_samples(buffer,nsamples,nchannels);
+#endif
+}
+
+#define OP_MIN(_a,_b) ((_a)<(_b)?(_a):(_b))
+
+/*A simple wrapper that lets us count the number of underlying seek calls.*/
+
+static op_seek_func real_seek;
+
+static long nreal_seeks;
+
+static int seek_stat_counter(void *_stream,opus_int64 _offset,int _whence){+ if(_whence==SEEK_SET)nreal_seeks++;
+ /*SEEK_CUR with an offset of 0 is free, as is SEEK_END with an offset of 0
+ (assuming we know the file size), so don't count them.*/
+ else if(_offset!=0)nreal_seeks++;
+ return (*real_seek)(_stream,_offset,_whence);
+}
+
+#define NSEEK_TESTS (1000)
+
+static void print_duration(FILE *_fp,ogg_int64_t _nsamples){+ ogg_int64_t seconds;
+ ogg_int64_t minutes;
+ ogg_int64_t hours;
+ ogg_int64_t days;
+ ogg_int64_t weeks;
+ seconds=_nsamples/48000;
+ _nsamples-=seconds*48000;
+ minutes=seconds/60;
+ seconds-=minutes*60;
+ hours=minutes/60;
+ minutes-=hours*60;
+ days=hours/24;
+ hours-=days*24;
+ weeks=days/7;
+ days-=weeks*7;
+ if(weeks)fprintf(_fp,"%liw",(long)weeks);
+ if(weeks||days)fprintf(_fp,"%id",(int)days);
+ if(weeks||days||hours)fprintf(_fp,"%ih",(int)hours);
+ if(weeks||days||hours||minutes)fprintf(_fp,"%im",(int)minutes);
+ fprintf(_fp,"%i.%03is",(int)seconds,(int)(_nsamples+24)/48);
+}
+
+int main(int _argc,const char **_argv){+ OpusFileCallbacks cb;
+ OggOpusFile *of;
+ void *fp;
+#if defined(_WIN32)
+# undef fileno
+# define fileno _fileno
+ /*We need to set stdin/stdout to binary mode. Damn windows.*/
+ /*Beware the evil ifdef. We avoid these where we can, but this one we
+ cannot.
+ Don't add any more.
+ You'll probably go to hell if you do.*/
+ _setmode(fileno(stdin),_O_BINARY);
+ _setmode(fileno(stdout),_O_BINARY);
+#endif
+ if(_argc!=2){+ fprintf(stderr,"Usage: %s <file.opus>\n",_argv[0]);
+ return EXIT_FAILURE;
+ }
+ memset(&cb,0,sizeof(cb));
+ if(strcmp(_argv[1],"-")==0)fp=op_fdopen(&cb,fileno(stdin),"rb");
+ else fp=op_fopen(&cb,_argv[1],"rb");
+ if(cb.seek!=NULL){+ real_seek=cb.seek;
+ cb.seek=seek_stat_counter;
+ }
+ of=op_open_callbacks(fp,&cb,NULL,0,NULL);
+ if(of==NULL){+ fprintf(stderr,"Failed to open file '%s'.\n",_argv[1]);
+ return EXIT_FAILURE;
+ }
+ if(op_seekable(of)){+ op_sample *bigassbuffer;
+ ogg_int64_t size;
+ ogg_int64_t pcm_print_offset;
+ ogg_int64_t pcm_offset;
+ ogg_int64_t pcm_length;
+ ogg_int64_t nsamples;
+ ogg_int64_t si;
+ opus_int32 bitrate;
+ int nlinks;
+ int ret;
+ int li;
+ int i;
+ /*Because we want to do sample-level verification that the seek does what
+ it claimed, decode the entire file into memory.*/
+ nlinks=op_link_count(of);
+ fprintf(stderr,"Opened file containing %i links with %li seeks "
+ "(%0.3f per link).\n",nlinks,nreal_seeks,nreal_seeks/(double)nlinks);
+ /*Reset the seek counter.*/
+ nreal_seeks=0;
+ nsamples=0;
+ for(li=0;li<nlinks;li++){+ nsamples+=op_pcm_total(of,li)*op_channel_count(of,li);
+ }
+ bigassbuffer=_ogg_malloc(sizeof(*bigassbuffer)*nsamples);
+ pcm_offset=op_pcm_tell(of);
+ if(pcm_offset!=0){+ fprintf(stderr,"Initial PCM offset was not 0, got %li instead.!\n",
+ (long)pcm_offset);
+ exit(EXIT_FAILURE);
+ }
+ pcm_print_offset=pcm_offset-48000;
+ bitrate=0;
+ for(si=0;si<nsamples;){+ ogg_int64_t next_pcm_offset;
+ opus_int32 next_bitrate;
+ ret=op_read_native(of,bigassbuffer+si,OP_MIN(120*48*8,nsamples-si),&li);
+ if(ret<=0){+ fprintf(stderr,"Failed to read PCM data: %i\n",ret);
+ exit(EXIT_FAILURE);
+ }
+ /*If we have gaps in the PCM positions, seeking is not likely to work
+ near them.*/
+ next_pcm_offset=op_pcm_tell(of);
+ if(pcm_offset+ret!=next_pcm_offset){+ fprintf(stderr,"\nGap in PCM offset: expecting %li, got %li\n",
+ (long)(pcm_offset+ret),(long)next_pcm_offset);
+ exit(EXIT_FAILURE);
+ }
+ pcm_offset=next_pcm_offset;
+ si+=ret*op_channel_count(of,li);
+ if(pcm_offset>=pcm_print_offset+48000){+ next_bitrate=op_bitrate_instant(of);
+ if(next_bitrate>=0)bitrate=next_bitrate;
+ fprintf(stderr,"\rLoading... [%li left] (%0.3f kbps) ",
+ nsamples-si,bitrate/1000.0);
+ pcm_print_offset=pcm_offset;
+ }
+ }
+ {+ op_sample tmp[8];
+ ret=op_read_native(of,tmp,sizeof(tmp)/sizeof(*tmp),&li);
+ if(ret<0){+ fprintf(stderr,"Failed to read PCM data: %i\n",ret);
+ exit(EXIT_FAILURE);
+ }
+ if(ret>0){+ fprintf(stderr,"Read too much PCM data!\n");
+ exit(EXIT_FAILURE);
+ }
+ }
+ pcm_length=op_pcm_total(of,-1);
+ size=op_raw_total(of,-1);
+ fprintf(stderr,"\rLoaded (%0.3f kbps average). \n",
+ op_bitrate(of,-1)/1000.0);
+ fprintf(stderr,"Testing raw seeking to random places in %li bytes...\n",
+ (long)size);
+ for(i=0;i<NSEEK_TESTS;i++){+ opus_int64 byte_offset;
+ byte_offset=(opus_int64)(rand()/(double)RAND_MAX*size);
+ fprintf(stderr,"\r\t%3i [raw position %li]... ",
+ i,(long)byte_offset);
+ ret=op_raw_seek(of,byte_offset);
+ if(ret<0){+ fprintf(stderr,"\nSeek failed: %i.\n",ret);
+ exit(EXIT_FAILURE);
+ }
+ if(i==28){+ i=28;
+ }
+ verify_seek(of,byte_offset,-1,pcm_length,bigassbuffer);
+ }
+ fprintf(stderr,"\rTotal seek operations: %li (%.3f per raw seek).\n",
+ nreal_seeks,nreal_seeks/(double)NSEEK_TESTS);
+ nreal_seeks=0;
+ fprintf(stderr,"Testing PCM page seeking to random places in %li "
+ "samples (",(long)pcm_length);+ print_duration(stderr,pcm_length);
+ fprintf(stderr,")...\n");
+ for(i=0;i<NSEEK_TESTS;i++){+ pcm_offset=(ogg_int64_t)(rand()/(double)RAND_MAX*pcm_length);
+ fprintf(stderr,"\r\t%3i [PCM position %li]... ",
+ i,(long)pcm_offset);
+ ret=op_pcm_seek_page(of,pcm_offset);
+ if(ret<0){+ fprintf(stderr,"\nSeek failed: %i.\n",ret);
+ exit(EXIT_FAILURE);
+ }
+ verify_seek(of,-1,pcm_offset,pcm_length,bigassbuffer);
+ }
+ fprintf(stderr,"\rTotal seek operations: %li (%.3f per page seek).\n",
+ nreal_seeks,nreal_seeks/(double)NSEEK_TESTS);
+ nreal_seeks=0;
+ fprintf(stderr,"Testing exact PCM seeking to random places in %li "
+ "samples (",(long)pcm_length);+ print_duration(stderr,pcm_length);
+ fprintf(stderr,")...\n");
+ for(i=0;i<NSEEK_TESTS;i++){+ ogg_int64_t pcm_offset2;
+ pcm_offset=(ogg_int64_t)(rand()/(double)RAND_MAX*pcm_length);
+ fprintf(stderr,"\r\t%3i [PCM position %li]... ",
+ i,(long)pcm_offset);
+ ret=op_pcm_seek(of,pcm_offset);
+ if(ret<0){+ fprintf(stderr,"\nSeek failed: %i.\n",ret);
+ exit(EXIT_FAILURE);
+ }
+ pcm_offset2=op_pcm_tell(of);
+ if(pcm_offset!=pcm_offset2){+ fprintf(stderr,"\nDeclared PCM position did not perfectly match "
+ "request: requested %li, got %li.\n",
+ (long)pcm_offset,(long)pcm_offset2);
+ exit(EXIT_FAILURE);
+ }
+ verify_seek(of,-1,pcm_offset,pcm_length,bigassbuffer);
+ }
+ fprintf(stderr,"\rTotal seek operations: %li (%.3f per exact seek).\n",
+ nreal_seeks,nreal_seeks/(double)NSEEK_TESTS);
+ nreal_seeks=0;
+ fprintf(stderr,"OK.\n");
+ }
+ else{+ fprintf(stderr,"Input was not seekable.\n");
+ exit(EXIT_FAILURE);
+ }
+ op_free(of);
+ return EXIT_SUCCESS;
+}
--- /dev/null
+++ b/include/opus/opusfile.h
@@ -1,0 +1,971 @@
+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE libopusfile SOURCE CODE IS (C) COPYRIGHT 1994-2012 *
+ * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: stdio-based convenience library for opening/seeking/decoding
+ last mod: $Id: vorbisfile.h 17182 2010-04-29 03:48:32Z xiphmont $
+
+ ********************************************************************/
+#if !defined(_opus_opusfile_h)
+# define _opus_opusfile_h (1)
+
+# if defined(__cplusplus)
+extern "C" {+# endif
+
+# include <stdio.h>
+# include <ogg/ogg.h>
+# include <opus/opus_multistream.h>
+
+/*Enable special features for gcc and gcc-compatible compilers.*/
+# if !defined(OP_GNUC_PREREQ)
+# if defined(__GNUC__)&&defined(__GNUC_MINOR__)
+# define OP_GNUC_PREREQ(_maj,_min) \
+ ((__GNUC__<<16)+__GNUC_MINOR__>=((_maj)<<16)+(_min))
+# else
+# define OP_GNUC_PREREQ(_maj,_min) 0
+# endif
+# endif
+
+# if OP_GNUC_PREREQ(4,0)
+# pragma GCC visibility push(default)
+# endif
+
+typedef struct OpusHead OpusHead;
+typedef struct OpusTags OpusTags;
+typedef struct OggOpusFile OggOpusFile;
+
+/*Warning attributes for libopusfile functions.*/
+# if OP_GNUC_PREREQ(3,4)
+# define OP_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
+# else
+# define OP_WARN_UNUSED_RESULT
+# endif
+# if OP_GNUC_PREREQ(3,4)
+# define OP_ARG_NONNULL(_x) __attribute__((__nonnull__(_x)))
+# else
+# define OP_ARG_NONNULL(_x)
+# endif
+
+/**A request did not succeed.*/
+#define OP_FALSE (-1)
+/*Currently not used externally.*/
+#define OP_EOF (-2)
+/**There was a hole in the page sequence numbers (e.g., a page was corrupt or
+ missing).*/
+#define OP_HOLE (-3)
+/**An underlying read, seek, or tell operation failed when it should have
+ succeeded.*/
+#define OP_EREAD (-128)
+/**A <code>NULL</code> pointer was passed where one was unexpected, or an
+ internal memory allocation failed, or an internal library error was
+ encountered.*/
+#define OP_EFAULT (-129)
+/**The stream used a feature that is not implemented, such as an unsupported
+ channel family.*/
+#define OP_EIMPL (-130)
+/**One or more parameters to a function were invalid.*/
+#define OP_EINVAL (-131)
+/**A purported Ogg Opus stream did not begin with an Ogg page, or a purported
+ header packet did not start with one of the required strings, "OpusHead" or
+ "OpusTags".*/
+#define OP_ENOTFORMAT (-132)
+/**A required header packet was not properly formatted, contained illegal
+ values, or was missing altogether.*/
+#define OP_EBADHEADER (-133)
+/**The ID header contained an unrecognized version number.*/
+#define OP_EVERSION (-134)
+/*Currently not used at all.*/
+#define OP_ENOTAUDIO (-135)
+/**An audio packet failed to decode properly.
+ This is usually caused by a multistream Ogg packet where the durations of
+ the individual Opus packets contained in it are not all the same.*/
+#define OP_EBADPACKET (-136)
+/**We failed to find data we had seen before, or the bitstream structure was
+ sufficiently malformed that seeking to the target destination was
+ impossible.*/
+#define OP_EBADLINK (-137)
+/**An operation that requires seeking was requested on an unseekable stream.*/
+#define OP_ENOSEEK (-138)
+/**The first or last granule position of a link failed basic validity checks.*/
+#define OP_EBADTIMESTAMP (-139)
+
+/**The maximum number of channels in an Ogg Opus stream.*/
+#define OPUS_CHANNEL_COUNT_MAX (255)
+
+/**Ogg Opus bitstream information.
+ This contains the basic playback parameters for a stream, and corresponds to
+ the initial ID header packet of an Ogg Opus stream.*/
+struct OpusHead{+ /**The Ogg Opus format version, in the range 0...255.
+ The top 4 bits represent a "major" version, and the bottom four bits
+ represent backwards-compatible "minor" revisions.
+ The current specification describes version 1.
+ This library will recognize versions up through 15 as backwards compatible
+ with the current specification.
+ An earlier draft of the specification described a version 0, but the only
+ difference between version 1 and version 0 is that version 0 did
+ not specify the semantics for handling the version field.*/
+ int version;
+ /**The number of channels, in the range 1...255.*/
+ int channel_count;
+ /**The number of samples that should be discarded from the beginning of the
+ stream.*/
+ unsigned pre_skip;
+ /**The sampling rate of the original input.
+ All Opus audio is coded at 48 kHz, and should also be decoded at 48 kHz
+ for playback (unless the target hardware does not support this sampling
+ rate).
+ However, this field may be used to resample the audio back to the original
+ sampling rate, for example, when saving the output to a file.*/
+ opus_uint32 input_sample_rate;
+ /**The gain to apply to the decoded output, in dB, as a Q8 value in the range
+ -32768...32767.
+ The decoder will automatically scale the output by
+ pow(10,output_gain/(20.0*256)).*/
+ int output_gain;
+ /**The channel mapping family, in the range 0...255.
+ Channel mapping family 0 covers mono or stereo in a single stream.
+ Channel mapping family 1 covers 1 to 8 channels in one or more streams,
+ using the Vorbis speaker assignments.
+ Channel mapping family 255 covers 1 to 255 channels in one or more
+ streams, but without any defined speaker assignment.*/
+ int mapping_family;
+ /**The number of Opus streams in each Ogg packet, in the range 1...255.*/
+ int stream_count;
+ /**The number of coupled Opus streams in each Ogg packet, in the range
+ 0...127.
+ This must satisfy <code>0 <= coupled_count <= stream_count</code> and
+ <code>coupled_count + stream_count <= 255</code>.
+ The coupled streams appear first, before all uncoupled streams, in an Ogg
+ Opus packet.*/
+ int coupled_count;
+ /**The mapping from coded stream channels to output channels.
+ Let <code>index=mapping[k]</code> be the value for channel <code>k</code>.
+ If <code>index<2*coupled_count</code>, then it refers to the left channel
+ from stream <code>(index/2)</code> if even, and the right channel from
+ stream <code>(index/2)</code> if odd.
+ Otherwise, it refers to the output of the uncoupled stream
+ <code>(index-coupled_count)</code>.*/
+ unsigned char mapping[OPUS_CHANNEL_COUNT_MAX];
+};
+
+/**The metadata from an Ogg Opus stream.
+
+ This structure holds the in-stream metadata corresponding to the 'comment'
+ header packet of an Ogg Opus stream.
+ The comment header is meant to be used much like someone jotting a quick
+ note on the label of a CD.
+ It should be a short, to the point text note that can be more than a couple
+ words, but not more than a short paragraph.
+
+ The metadata is stored as a series of (tag, value) pairs, in length-encoded
+ string vectors, using the same format as Vorbis (without the final "framing
+ bit"), Theora, and Speex, except for the packet header.
+ The first occurrence of the '=' character delimits the tag and value.
+ A particular tag may occur more than once, and order is significant.
+ The character set encoding for the strings is always UTF-8, but the tag
+ names are limited to ASCII, and treated as case-insensitive.
+ See <a href="http://www.xiph.org/vorbis/doc/v-comment.html">the Vorbis
+ comment header specification</a> for details.
+
+ In filling in this structure, \a libopsfile will null-terminate the
+ #user_comments strings for safety.
+ However, the bitstream format itself treats them as 8-bit clean vectors,
+ possibly containing NUL characters, so the #comment_lengths array should be
+ treated as their authoritative length.
+
+ This structure is binary and source-compatible with a
+ <code>vorbis_comment</code>, and pointers to it may be freely cast to
+ <code>vorbis_comment</code> pointers, and vice versa.
+ It is provided as a separate type to avoid introducing a compile-time
+ dependency on the libvorbis headers.*/
+struct OpusTags{+ /**The array of comment string vectors.*/
+ char **user_comments;
+ /**An array of the corresponding length of each vector, in bytes.*/
+ int *comment_lengths;
+ /**The total number of comment streams.*/
+ int comments;
+ /**The null-terminated vendor string.
+ This identifies the software used to encode the stream.*/
+ char *vendor;
+};
+
+/**\name Functions for manipulating header data
+ These functions manipulate the #OpusHead and #OpusTags structures,
+ which describe the audio parameters and tag-value metadata, respectively.*/
+/*@{*/+/**Parses the contents of the ID header packet of an Ogg Opus stream.
+ \param[out] _head Returns the contents of the parsed packet.
+ The contents of this structure are untouched on error.
+ This may be <code>NULL</code> to merely test the header
+ for validity.
+ \param[in] _data The contents of the ID header packet.
+ \param _len The number of bytes of data in the ID header packet.
+ \return 0 on success or a negative value on error.
+ \retval #OP_ENOTFORMAT If the data does not start with the "OpusHead"
+ string.
+ \retval #OP_EVERSION If the version field signaled a version this library
+ does not know how to parse.
+ \retval #OP_EIMPL If the channel mapping family was 255, which general
+ purpose players should not attempt to play.
+ \retval #OP_EBADHEADER If the contents of the packet otherwise violate the
+ Ogg Opus specification:
+ <ul>
+ <li>Insufficient data,</li>
+ <li>Too much data for the known minor versions,</li>
+ <li>An unrecognized channel mapping family,</li>
+ <li>Zero channels or too many channels,</li>
+ <li>Zero coded streams,</li>
+ <li>Too many coupled streams, or</li>
+ <li>An invalid channel mapping index.</li>
+ </ul>*/
+OP_WARN_UNUSED_RESULT int opus_head_parse(OpusHead *_head,
+ const unsigned char *_data,size_t _len) OP_ARG_NONNULL(2);
+/**Converts a granule position to a sample offset for a given Ogg Opus stream.
+ The sample offset is simply <code>_gp-_head->pre_skip</code>.
+ Granule position values smaller than OpusHead#pre_skip correspond to audio
+ that should never be played, and thus have no associated sample offset.
+ This function returns -1 for such values.
+ This function also correctly handles extremely large granule positions,
+ which may have wrapped around to a negative number when stored in a signed
+ ogg_int64_t value.
+ \param _head The #OpusHead information from the ID header of the stream.
+ \param _gp The granule position to convert.
+ \return The sample offset associated with the given granule position
+ (counting at a 48 kHz sampling rate), or the special value -1 on
+ error (i.e., the granule position was smaller than the pre-skip
+ amount).*/
+ogg_int64_t opus_granule_sample(const OpusHead *_head,ogg_int64_t _gp)
+ OP_ARG_NONNULL(1);
+
+/**Parses the contents of the 'comment' header packet of an Ogg Opus stream.
+ \param[out] _tags An uninitialized #OpusTags structure.
+ This returns the contents of the parsed packet.
+ The contents of this structure are untouched on error.
+ This may be <code>NULL</code> to merely test the header
+ for validity.
+ \param[in] _data The contents of the 'comment' header packet.
+ \param _len The number of bytes of data in the 'info' header packet.
+ \retval 0 Success.
+ \retval #OP_ENOTFORMAT If the data does not start with the "OpusTags"
+ string.
+ \retval #OP_EBADHEADER If the contents of the packet otherwise violate the
+ Ogg Opus specification.
+ \retval #OP_EFAULT If there wasn't enough memory to store the tags.*/
+OP_WARN_UNUSED_RESULT int opus_tags_parse(OpusTags *_tags,
+ const unsigned char *_data,size_t _len) OP_ARG_NONNULL(2);
+/**Initializes an #OpusTags structure.
+ This should be called on a freshly allocated #OpusTags structure before
+ attempting to use it.
+ \param _tags The #OpusTags structure to initialize.*/
+void opus_tags_init(OpusTags *_tags) OP_ARG_NONNULL(1);
+/**Add a (tag, value) pair to an initialized #OpusTags structure.
+ \note Neither opus_tags_add() nor opus_tags_add_comment() support values
+ containing embedded NULs, although the bitstream format does support them.
+ To add such tags, you will need to manipulate the #OpusTags structure
+ directly.
+ \param _tags The #OpusTags structure to add the (tag, value) pair to.
+ \param _tag A NUL-terminated, case-insensitive, ASCII string containing
+ the tag to add (without an '=' character).
+ \param _comment A NUL-terminated UTF-8 containing the corresponding value.*/
+int opus_tags_add(OpusTags *_tags,const char *_tag,const char *_value)
+ OP_ARG_NONNULL(1) OP_ARG_NONNULL(2) OP_ARG_NONNULL(3);
+/**Add a comment to an initialized #OpusTags structure.
+ \note Neither opus_tags_add_comment() nor opus_tags_add() support comments
+ containing embedded NULs, although the bitstream format does support them.
+ To add such tags, you will need to manipulate the #OpusTags structure
+ directly.
+ \param _tags The #OpusTags structure to add the comment to.
+ \param _comment A NUL-terminated UTF-8 string containing the comment in
+ "TAG=value" form.*/
+int opus_tags_add_comment(OpusTags *_tags,const char *_comment)
+ OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
+/**Look up a comment value by its tag.
+ \param _tags An initialized #OpusTags structure.
+ \param _tag The tag to look up.
+ \param _count The instance of the tag.
+ The same tag can appear multiple times, each with a distinct
+ value, so an index is required to retrieve them all.
+ The order in which these values appear is significant and
+ should be preserved.
+ Use opus_tags_query_count() to get the legal range for the
+ \a _count parameter.
+ \return A pointer to the queried tag's value.
+ This points directly to data in the #OpusTags structure.
+ It should not be modified or freed by the application, and
+ modifications to the structure may invalidate the pointer.
+ \retval <code>NULL</code> if no matching tag is found.*/
+const char *opus_tags_query(const OpusTags *_tags,const char *_tag,int _count)
+ OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
+/**Look up the number of instances of a tag.
+ Call this first when querying for a specific tag and then iterate over the
+ number of instances with separate calls to opus_tags_query() to retrieve
+ all the values for that tag in order.
+ \param _tags An initialized #OpusTags structure.
+ \param _tag The tag to look up.
+ \return The number of instances of this particular tag.*/
+int opus_tags_query_count(const OpusTags *_tags,const char *_tag)
+ OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
+/**Clears the #OpusTags structure.
+ This should be called on an #OpusTags structure after it is no longer
+ needed.
+ It will free all memory used by the structure members.
+ \param _tags The #OpusTags structure to clear.*/
+void opus_tags_clear(OpusTags *_tags) OP_ARG_NONNULL(1);
+
+/*@}*/
+
+/**\name Functions for reading from streams
+ These functions define the interface used to read from and seek in a stream
+ of data.
+ A stream does not need to implement seeking, but the decoder will not be
+ able to seek if it does not do so.
+ These functions also include some convenience routines for working with
+ standard FILE pointers or complete files stored in a single block of
+ memory.*/
+/*@{*/+
+typedef struct OpusFileCallbacks OpusFileCallbacks;
+
+/**Reads \a _nmemb elements of data, each \a _size bytes long, from
+ \a _stream.
+ \return The number of items successfully read (i.e., not the number of
+ characters).
+ Unlike normal <code>fread()</code>, this function is allowed to
+ return fewer bytes than requested (e.g., if reading more would
+ block), as long as <em>some</em> data is returned when no error
+ occurs and EOF has not been reached.
+ If an error occurs, or the end-of-file is reached, the return
+ value is zero.*/
+typedef size_t (*op_read_func)(void *_ptr,size_t _size,size_t _nmemb,
+ void *_stream);
+/**Sets the position indicator for \a _stream.
+ The new position, measured in bytes, is obtained by adding \a _offset
+ bytes to the position specified by \a _whence.
+ If \a _whence is set to <code>SEEK_SET</code>, <code>SEEK_CUR</code>, or
+ <code>SEEK_END</code>, the offset is relative to the start of the stream,
+ the current position indicator, or end-of-file, respectively.
+ \retval 0 Success.
+ \retval -1 Seeking is not supported or an error occurred.
+ <code>errno</code> need not be set.*/
+typedef int (*op_seek_func)(void *_stream,opus_int64 _offset,int _whence);
+/**Obtains the current value of the position indicator for \a _stream.
+ \return The current position indicator.*/
+typedef opus_int64 (*op_tell_func)(void *_stream);
+/**Closes the underlying stream.
+ \retval 0 Success.
+ \retval EOF An error occurred.
+ <code>errno</code> need not be set.*/
+typedef int (*op_close_func)(void *_stream);
+
+/**The callbacks used to access non-FILE stream resources.
+ The function prototypes are basically the same as for the stdio functions
+ <code>fread()</code>, <code>fseek()</code>, <code>ftell()</code>, and
+ <code>fclose()</code>.
+ The differences are that the <code>FILE *</code> arguments have been
+ replaced with a <code>void *</code>, which is to be used as a pointer to
+ whatever internal data these functions might need, that #seek_func and
+ #tell_func take and return 64-bit offsets, and that #seek_func *must*
+ return -1 if the stream is unseekable.*/
+struct OpusFileCallbacks{+ /**Used to read data from the stream.
+ This must not be <code>NULL</code>.*/
+ op_read_func read;
+ /**Used to seek in the stream.
+ This may be <code>NULL</code> if seeking is not implemented.*/
+ op_seek_func seek;
+ /**Used to return the current read position in the stream.
+ This may be <code>NULL</code> if seeking is not implemented.*/
+ op_tell_func tell;
+ /**Used to close the stream when the decoder is freed.
+ This may be <code>NULL</code> to leave the stream open.*/
+ op_close_func close;
+};
+
+/**Opens a stream with <code>fopen()</code> and fills in a set of callbacks
+ that can be used to access it.
+ This is useful to avoid writing your own portable 64-bit seeking wrappers,
+ and also avoids cross-module linking issues on Windows, where a
+ <code>FILE *</code> must be accessed by routines defined in the same module
+ that opened it.
+ \param[out] _cb The callbacks to use for this file.
+ If there is an error opening the file, nothing will be
+ filled in here.
+ \param _path The path to the file to open.
+ \param _mode The mode to open the file in.
+ \return A stream handle to use with the callbacks, or NULL on error.*/
+OP_WARN_UNUSED_RESULT void *op_fopen(OpusFileCallbacks *_cb,
+ const char *_path,const char *_mode) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2)
+ OP_ARG_NONNULL(3);
+/**Opens a stream with <code>fdopen()</code> and fills in a set of callbacks
+ that can be used to access it.
+ This is useful to avoid writing your own portable 64-bit seeking wrappers,
+ and also avoids cross-module linking issues on Windows, where a
+ <code>FILE *</code> must be accessed by routines defined in the same module
+ that opened it.
+ \param[out] _cb The callbacks to use for this file.
+ If there is an error opening the file, nothing will be
+ filled in here.
+ \param _fd The file descriptor to open.
+ \param _mode The mode to open the file in.
+ \return A stream handle to use with the callbacks, or NULL on error.*/
+OP_WARN_UNUSED_RESULT void *op_fdopen(OpusFileCallbacks *_cb,
+ int _fd,const char *_mode) OP_ARG_NONNULL(1) OP_ARG_NONNULL(3);
+/**Opens a stream with <code>freopen()</code> and fills in a set of callbacks
+ that can be used to access it.
+ This is useful to avoid writing your own portable 64-bit seeking wrappers,
+ and also avoids cross-module linking issues on Windows, where a
+ <code>FILE *</code> must be accessed by routines defined in the same module
+ that opened it.
+ \param[out] _cb The callbacks to use for this file.
+ If there is an error opening the file, nothing will be
+ filled in here.
+ \param _path The path to the file to open.
+ \param _mode The mode to open the file in.
+ \param _stream A stream previously returned by op_fopen(), op_fdopen(),
+ or op_freopen().
+ \return A stream handle to use with the callbacks, or NULL on error.*/
+void *op_freopen(OpusFileCallbacks *_cb,const char *_path,const char *_mode,
+ void *_stream) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2) OP_ARG_NONNULL(3)
+ OP_ARG_NONNULL(4);
+
+/**Creates a stream that reads from the given block of memory.
+ This block of memory must contain the complete file to decode.
+ This is useful for caching small files (e.g., sound effects) in RAM.
+ \param[out] _cb The callbacks to use for this stream.
+ If there is an error creating the stream, nothing will be
+ filled in here.
+ \param _data The block of memory to read from.
+ \param _size The size of the block of memory.
+ \return A stream handle to use with the callbacks, or NULL on error.*/
+void *op_mem_stream_create(OpusFileCallbacks *_cb,
+ const unsigned char *_data,size_t _size);
+
+/*@}*/
+
+/**Test to see if this is an Opus file.
+ For good results, you will need at least 57 bytes (for a pure Opus-only
+ file).
+ Something more like 512 bytes will give more reliable results for
+ multiplexed files.
+ This function is meant to be a quick-rejection filter.
+ Its purpose is not to guarantee that a stream is a valid Opus stream, but to
+ ensure that looks enough like Opus that it isn't going to be recognized as
+ some other format (except possibly an Opus stream that is also multiplexed
+ with other codecs, such as video).
+ If you need something that gives a much better guarantee that this stream
+ can be opened successfully, use op_test_callbacks() or one of the
+ associated convenience functions.
+ \param[out] _head The parsed ID header contents.
+ You may pass <code>NULL</code> if you do not need
+ this information.
+ If the function fails, the contents of this structure
+ remain untouched.
+ \param _initial_data An initial buffer of data from the start of the
+ stream.
+ \param _initial_bytes The number of bytes in \a _initial_data.
+ \return 0 if the data appears to be Opus, or a negative value on error.
+ \retval #OP_FALSE There was not enough data to tell if this was an Opus
+ stream or not.
+ \retval #OP_EFAULT An internal memory allocation failed.
+ \retval #OP_EIMPL The stream used a feature that is not implemented,
+ such as an unsupported channel family.
+ \retval #OP_ENOTFORMAT If the data did not contain a recognizable ID
+ header for an Opus stream.
+ \retval #OP_EVERSION If the version field signaled a version this library
+ does not know how to parse.
+ \retval #OP_EBADHEADER A required header packet was not properly formatted,
+ contained illegal values, or was missing
+ altogether.*/
+int op_test(OpusHead *_head,
+ const unsigned char *_initial_data,size_t _initial_bytes);
+
+/**Open a stream from the given file path.
+ \param _path The path to the file to open.
+ \param[out] _error Returns 0 on success, or a failure code on error.
+ You may pass in NULL if you don't want the failure code.
+ The failure code will be #OP_EFAULT if the file could not
+ be opened, or one of the other failure codes from
+ op_open_callbacks() otherwise.
+ \return An #OggOpusFile pointer on success, or NULL on error.*/
+OggOpusFile *op_open_file(const char *_path,int *_error);
+
+/**Open a stream from a memory buffer.
+ \param _data The memory buffer to open.
+ \param _size The number of bytes in the buffer.
+ \param[out] _error Returns 0 on success, or a failure code on error.
+ You may pass in NULL if you don't want the failure code.
+ See op_open_callbacks() for a full list of failure codes.
+ \return An #OggOpusFile pointer on success, or NULL on error.*/
+OggOpusFile *op_open_memory(const unsigned char *_data,size_t _size,
+ int *_error);
+
+/**Open a stream using the given set of callbacks to access it.
+ \param _source The stream to read from (e.g., a <code>FILE *</code>).
+ \param _cb The callbacks with which to access the stream.
+ <code><a href="#op_read_func">read()</a></code> must
+ be implemented.
+ <code><a href="#op_seek_func">seek()</a></code> and
+ <code><a href="#op_tell_func">tell()</a></code> may
+ be <code>NULL</code>, or may always return -1 to
+ indicate a source is unseekable, but if
+ <code><a href="#op_seek_func">seek()</a></code> is
+ implemented and succeeds on a particular source, then
+ <code><a href="#op_tell_func">tell()</a></code> must
+ also.
+ <code><a href="#op_close_func">close()</a></code> may
+ be <code>NULL</code>, but if it is not, it will be
+ called when the #OggOpusFile is destroyed by
+ op_free().
+ It will not be called if op_open_callbacks() fails
+ with an error.
+ \param _initial_data An initial buffer of data from the start of the
+ stream.
+ Applications can read some number of bytes from the
+ start of the stream to help identify this as an Opus
+ stream, and then provide them here to allow the
+ stream to be opened, even if it is unseekable.
+ \param _initial_bytes The number of bytes in \a _initial_data.
+ If the stream is seekable, its current position (as
+ reported by
+ <code><a href="#opus_tell_func">tell()</a></code>
+ at the start of this function) must be equal to
+ \a _initial_bytes.
+ Otherwise, seeking to absolute positions will
+ generate inconsistent results.
+ \param[out] _error Returns 0 on success, or a failure code on error.
+ You may pass in NULL if you don't want the failure
+ code.
+ The failure code will be one of
+ <dl>
+ <dt>#OP_EREAD</dt>
+ <dd>An underlying read, seek, or tell operation
+ failed when it should have succeeded, or we failed
+ to find data in the stream we had seen before.</dd>
+ <dt>#OP_EFAULT</dt>
+ <dd>There was a memory allocation failure, or an
+ internal library error.</dd>
+ <dt>#OP_EIMPL</dt>
+ <dd>The stream used a feature that is not
+ implemented, such as an unsupported channel
+ family.</dd>
+ <dt>#OP_EINVAL</dt>
+ <dd><code><a href="#op_seek_func">seek()</a></code>
+ was implemented and succeeded on this source, but
+ <code><a href="#op_tell_func">tell()</a></code>
+ did not, or the starting position indicator was
+ not equal to \a _initial_bytes.</dd>
+ <dt>#OP_ENOTFORMAT</dt>
+ <dd>The stream contained a link that did not have
+ any logical Opus streams in it.</dd>
+ <dt>#OP_EBADHEADER</dt>
+ <dd>A required header packet was not properly
+ formatted, contained illegal values, or was missing
+ altogether.</dd>
+ <dt>#OP_EVERSION</dt>
+ <dd>An ID header contained an unrecognized version
+ number.</dd>
+ <dt>#OP_EBADLINK</dt>
+ <dd>We failed to find data we had seen before after
+ seeking.</dd>
+ <dt>#OP_EBADTIMESTAMP</dt>
+ <dd>The first or last timestamp in a link failed
+ basic validity checks.</dd>
+ </dl>
+ \return A freshly opened #OggOpusFile, or <code>NULL</code> on error.*/
+OggOpusFile *op_open_callbacks(void *_source,const OpusFileCallbacks *_cb,
+ const unsigned char *_initial_data,size_t _initial_bytes,int *_error);
+
+/**Release all memory used by an #OggOpusFile.*/
+void op_free(OggOpusFile *_of);
+
+/**Partially open a stream from the given file path.
+ \param _path The path to the file to open.
+ \param[out] _error Returns 0 on success, or a failure code on error.
+ You may pass in NULL if you don't want the failure code.
+ The failure code will be #OP_EFAULT if the file could not
+ be opened, or one of the other failure codes from
+ op_open_callbacks() otherwise.
+ \return An #OggOpusFile pointer on success, or NULL on error.*/
+OggOpusFile *op_test_file(const char *_path,int *_error);
+
+/**Partially open a stream from a memory buffer.
+ \param _data The memory buffer to open.
+ \param _size The number of bytes in the buffer.
+ \param[out] _error Returns 0 on success, or a failure code on error.
+ You may pass in NULL if you don't want the failure code.
+ See op_open_callbacks() for a full list of failure codes.
+ \return An #OggOpusFile pointer on success, or NULL on error.*/
+OggOpusFile *op_test_memory(const unsigned char *_data,size_t _size,
+ int *_error);
+
+/**Partially opens the Opus file.
+ This tests for Opusness and loads the headers for the first link.
+ It does not seek (although it tests for seekability).
+ Use op_test_open() to finish opening the file, or op_free() to dispose of
+ it.
+ \param _source The stream to read from (e.g., a <code>FILE *</code>).
+ \param _cb The callbacks with which to access the stream.
+ <code><a href="#op_read_func">read()</a></code> must
+ be implemented.
+ <code><a href="#op_seek_func">seek()</a></code> and
+ <code><a href="#op_tell_func">tell()</a></code> may
+ be <code>NULL</code>, or may always return -1 to
+ indicate a source is unseekable, but if
+ <code><a href="#op_seek_func">seek()</a></code> is
+ implemented and succeeds on a particular source, then
+ <code><a href="#op_tell_func">tell()</a></code> must
+ also.
+ <code><a href="#op_close_func">close()</a></code> may
+ be <code>NULL</code>, but if it is not, it will be
+ called when the #OggOpusFile is destroyed by
+ op_free().
+ It will not be called if op_open_callbacks() fails
+ with an error.
+ \param _initial_data An initial buffer of data from the start of the
+ stream.
+ Applications can read some number of bytes from the
+ start of the stream to help identify this as an Opus
+ stream, and then provide them here to allow the
+ stream to be tested more thoroughly, even if it is
+ unseekable.
+ \param _initial_bytes The number of bytes in \a _initial_data.
+ If the stream is seekable, its current position (as
+ reported by
+ <code><a href="#opus_tell_func">tell()</a></code>
+ at the start of this function) must be equal to
+ \a _initial_bytes.
+ Otherwise, seeking to absolute positions will
+ generate inconsistent results.
+ \param[out] _error Returns 0 on success, or a failure code on error.
+ You may pass in NULL if you don't want the failure
+ code.
+ See op_open_callbacks() for a full list of failure
+ codes.
+ \return A freshly opened #OggOpusFile, or <code>NULL</code> on error.*/
+OggOpusFile *op_test_callbacks(void *_source,const OpusFileCallbacks *_cb,
+ const unsigned char *_initial_data,size_t _initial_bytes,int *_error);
+
+/**Finish opening a stream partially opened with op_test_callbacks() or one of
+ the associated convenience functions.
+ If this function fails, you are still responsible for freeing the
+ #OggOpusFile with op_free().
+ \return 0 on success, or a negative value on error.
+ \retval #OP_EREAD An underlying read, seek, or tell operation failed
+ when it should have succeeded.
+ \retval #OP_EFAULT There was a memory allocation failure, or an
+ internal library error.
+ \retval #OP_EIMPL The stream used a feature that is not implemented,
+ such as an unsupported channel family.
+ \retval #OP_EINVAL The stream was not partially opened with
+ op_test_callbacks() or one of the associated
+ convenience functions.
+ \retval #OP_ENOTFORMAT The stream contained a link that did not have any
+ logical Opus streams in it.
+ \retval #OP_EBADHEADER A required header packet was not properly
+ formatted, contained illegal values, or was
+ missing altogether.
+ \retval #OP_EVERSION An ID header contained an unrecognized version
+ number.
+ \retval #OP_EBADLINK We failed to find data we had seen before after
+ seeking.
+ \retval #OP_EBADTIMESTAMP The first or last timestamp in a link failed basic
+ validity checks.*/
+int op_test_open(OggOpusFile *_of);
+
+/**Returns the number of links in this chained file.
+ \return For seekable sources, this returns the total number of links in the
+ whole file.
+ For unseekable sources, this always returns 1.*/
+int op_link_count(OggOpusFile *_of);
+
+/**Returns whether or not the data source being read is seekable.
+ This is true if
+ a) The seek and tell callbacks are both non-NULL,
+ b) The seek callback was successfully executed at least once, and
+ c) The tell callback was successfully able to report the position indicator
+ afterwards.
+ \return A non-zero value if seekable, and 0 if unseekable.*/
+int op_seekable(OggOpusFile *_of);
+
+/**Get the serial number of the given link in a (possibly-chained) Ogg Opus
+ stream.
+ \param _li The index of the link whose serial number should be retrieved.
+ Use a negative number to get the serial number of the current
+ link.
+ \return The serial number of the given link.
+ If \a _li is greater than the total number of links, this returns
+ the serial number of the last link.
+ If the source is not seekable, this always returns the serial number
+ of the current link.*/
+opus_uint32 op_serialno(OggOpusFile *_of,int _li);
+
+/**Get the channel count of the given link in a (possibly-chained Ogg Opus
+ stream.
+ This is equivalent to <code>op_head(_of,_li)->channel_count</code>, but
+ is provided for convenience.
+ \param _li The index of the link whose channel count should be retrieved.
+ Use a negative number to get the channel count of the current
+ link.
+ \return The channel count of the given link.
+ If \a _li is greater than the total number of links, this returns
+ the channel count of the last link.
+ If the source is not seekable, this always returns the channel count
+ of the current link.*/
+int op_channel_count(OggOpusFile *_of,int _li);
+
+/**Get the total (compressed) size of the stream, or of an individual link in
+ a (possibly-chained) Ogg Opus file, including all Ogg muxing overhead.
+ \param _li The index of the link whose compressed size should be computed.
+ Use a negative number to get the compressed size of the entire
+ stream.
+ \return The compressed size of the entire stream if \a _li is negative, the
+ compressed size of link \a _li if it is non-negative, or a negative
+ value on error.
+ \retval #OP_EINVAL The source is not seekable (so we can't know the length),
+ \a _li wasn't less than the total number of links in
+ the stream, or the stream was only partially open.*/
+opus_int64 op_raw_total(OggOpusFile *_of,int _li);
+
+/**Get the total PCM length (number of samples at 48 kHz) of the stream, or of
+ an individual link in a (possibly-chained) Ogg Opus file.
+ Users looking for <code>op_time_total()</code> should use op_pcm_total()
+ instead.
+ Because timestamps in Opus are fixed at 48 kHz, there is no need for a
+ separate function to convert this to seconds (and leaving it out avoids
+ introducing floating point to the API, for those that wish to avoid it).
+ \param _li The index of the link whose PCM length should be computed.
+ Use a negative number to get the PCM length of the entire stream.
+ \return The PCM length of the entire stream if \a _li is negative, the PCM
+ length of link \a _li if it is non-negative, or a negative value on
+ error.
+ \retval #OP_EINVAL The source is not seekable (so we can't know the length),
+ \a _li wasn't less than the total number of links in
+ the stream, or the stream was only partially open.*/
+ogg_int64_t op_pcm_total(OggOpusFile *_of,int i);
+
+/**Get the ID header information for the given link in a (possibly chained) Ogg
+ Opus stream.
+ \param _li The index of the link whose ID header information should be
+ retrieved.
+ Use a negative number to get the ID header information of the
+ current link.
+ For an unseekable stream, \a _li is ignored, and the ID header
+ information for the current link is always returned, if
+ available.
+ \return The contents of the ID header for the given link, or
+ <code>NULL</code> if either \a _li is larger than the number of
+ links or the current link was requested, but the stream was only
+ partially open.*/
+const OpusHead *op_head(OggOpusFile *_of,int _li);
+
+/**Get the comment header information for the given link in a (possibly
+ chained) Ogg Opus stream.
+ \param _li The index of the link whose comment header information should be
+ retrieved.
+ Use a negative number to get the comment header information of
+ the current link.
+ For an unseekable stream, \a _li is ignored, and the comment
+ header information for the current link is always returned, if
+ available.
+ \return The contents of the comment header for the given link, or
+ <code>NULL</code> if either \a _li is larger than the number of
+ links or the current link was requested, but the stream was only
+ partially open.*/
+const OpusTags *op_tags(OggOpusFile *_of,int _li);
+
+/**Computes the bitrate for a given link in a (possibly chained) Ogg Opus
+ stream.
+ The stream must be seekable to compute the bitrate.
+ For unseekable streams, use op_bitrate_instant() to get periodic estimates.
+ \param _li The index of the link whose bitrate should be computed.
+ USe a negative number to get the bitrate of the whole stream.
+ \return The bitrate on success, or a negative value on error.
+ \retval #OP_EINVAL The stream was not fully open, the stream was not
+ seekable, or \a _li was larger than the number of
+ links.*/
+opus_int32 op_bitrate(OggOpusFile *_of,int _li);
+
+/**Compute the instantaneous bitrate, measured as the ratio of bits to playable
+ samples decoed since a) the last call to op_bitrate_instant(), b) the last
+ seek, or c) the start of playback, whichever was most recent.
+ This will spike somewhat after a seek or at the start/end of a chain
+ boundary, as pre-skip, pre-roll, and end-trimming causes samples to be
+ decoded but not played.
+ \return The bitrate, in bits per second, or a negative value on error.
+ \retval #OP_EFALSE No data has been decoded since any of the events
+ described above.
+ \retval #OP_EINVAL The stream was not fully open.*/
+opus_int32 op_bitrate_instant(OggOpusFile *_of);
+
+/**Seek to a byte offset relative to the <b>compressed</b> data.
+ This also scans packets to update the PCM cursor.
+ It will cross a logical bitstream boundary, but only if it can't get any
+ packets out of the tail of the link to which it seeks.
+ \param _byte_offset The byte position to seek to.
+ \return 0 on success, or a negative error code on failure.
+ \retval #OP_EREAD The seek failed.
+ \retval #OP_EINVAL The stream was not fully open, or the target was
+ outside the valid range for the stream.
+ \retval #OP_ENOSEEK This stream is not seekable.
+ \retval #OP_EBADLINK Failed to initialize a decoder for a stream for an
+ unknown reason.*/
+int op_raw_seek(OggOpusFile *_of,opus_int64 _byte_offset);
+
+/**Seek to a page preceding the specified PCM offset, such that decoding will
+ quickly arrive at the requested position.
+ This is faster than sample-granularity seeking because it doesn't do the
+ last bit of decode to find a specific sample.
+ \param _pcm_offset The PCM offset to seek to.
+ This is in samples at 48 kHz relative to the start of the
+ stream.
+ \return 0 on success, or a negative value on error.
+ \retval #OP_EREAD The seek failed.
+ \retval #OP_EINVAL The stream was not fully open, or the target was outside
+ the valid range for the stream.
+ \retval #OP_ENOSEEK This stream is not seekable.*/
+int op_pcm_seek_page(OggOpusFile *_of,ogg_int64_t _pcm_offset);
+
+/**Seek to the specified PCM offset, such that decoding will begin at exactly
+ the requested position.
+ \param _pcm_offset The PCM offset to seek to.
+ This is in samples at 48 kHz relative to the start of the
+ stream.
+ \return 0 on success, or a negative value on error.
+ \retval #OP_EREAD The seek failed.
+ \retval #OP_EINVAL The stream was not fully open, or the target was outside
+ the valid range for the stream.
+ \retval #OP_ENOSEEK This stream is not seekable.*/
+int op_pcm_seek(OggOpusFile *_of,ogg_int64_t _pcm_offset);
+
+/**Obtain the current value of the position indicator for \a _of.
+ \return The byte position that is currently being read from.*/
+opus_int64 op_raw_tell(OggOpusFile *_of);
+/**Obtain the PCM offset of the next sample to be read.
+ If the file is not properly timestamped, this might not increment by the
+ proper amount between reads, or even return monotonically increasing
+ values.
+ \return The PCM offset of the next sample to be read.*/
+ogg_int64_t op_pcm_tell(OggOpusFile *_of);
+
+/**Reads more samples from the stream.
+ \param[out] _pcm A buffer in which to store the output PCM samples, as
+ signed native-endian 16-bit values with a nominal
+ range of <code>[-32768,32767)</code>.
+ Multiple channels are interleaved using the
+ <a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis
+ channel ordering</a>.
+ This must have room for at least \a _buf_size values.
+ \param _buf_size The number of values that can be stored in \a _pcm.
+ It is reccommended that this be large enough for at
+ least 120 ms of data at 48 kHz per channel (5760
+ values per channel).
+ Smaller buffers will simply return less data, possibly
+ consuming more memory to buffer the data internally.
+ \param[out] _li The index of the link this data was decoded from.
+ You may pass NULL if you do not need this information.
+ If this function fails (returning a negative value),
+ this parameter is left unset.
+ \return The number of samples read per channel on success, or a negative
+ value on failure.
+ The channel count can be retrieved on success by calling
+ <code>op_head(_of,*_li)</code>.
+ The number of samples returned may be 0 if the buffer was too small
+ to store even a single sample for all channels, or if end of file
+ was reached.
+ The list of possible failure codes follows.
+ Most of them can only be returned by unseekable, chained streams
+ that encounter a new link.
+ \retval #OP_EFAULT An internal memory allocation failed.
+ \retval #OP_EIMPL An unseekable stream encountered a new link that
+ used a feature that is not implemented, such as
+ an unsupported channel family.
+ \retval #OP_EINVAL The stream was not fully open.
+ \retval #OP_ENOTFORMAT An unseekable stream encountered a new link that
+ contained a link that did not have any logical
+ Opus streams in it.
+ \retval #OP_EBADHEADER An unseekable stream encountered a new link with a
+ required header packet that was not properly
+ formatted, contained illegal values, or was
+ missing altogether.
+ \retval #OP_EVERSION An unseekable stream encountered a new link with
+ an ID header that contained an unrecognized
+ version number.
+ \retval #OP_EBADPACKET Failed to properly decode the next packet.
+ \retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with
+ a starting timestamp that failed basic validity
+ checks.*/
+int op_read(OggOpusFile *_of,opus_int16 *_pcm,int _buf_size,int *_li);
+
+/**Reads more samples from the stream.
+ \param[out] _pcm A buffer in which to store the output PCM samples as
+ signed floats with a nominal range of
+ <code>[-1.0,1.0]</code>.
+ Multiple channels are interleaved using the
+ <a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis
+ channel ordering</a>.
+ This must have room for at least \a _buf_size floats.
+ \param _buf_size The number of floats that can be stored in \a _pcm.
+ It is reccommended that this be large enough for at
+ least 120 ms of data at 48 kHz per channel (5760
+ samples per channel).
+ Smaller buffers will simply return less data, possibly
+ consuming more memory to buffer the data internally.
+ \param[out] _li The index of the link this data was decoded from.
+ You may pass NULL if you do not need this information.
+ If this function fails (returning a negative value),
+ this parameter is left unset.
+ \return The number of samples read per channel on success, or a negative
+ value on failure.
+ The channel count can be retrieved on success by calling
+ <code>op_head(_of,*_li)</code>.
+ The number of samples returned may be 0 if the buffer was too small
+ to store even a single sample for all channels, or if end of file
+ was reached.
+ The list of possible failure codes follows.
+ Most of them can only be returned by unseekable, chained streams
+ that encounter a new link.
+ \retval #OP_EFAULT An internal memory allocation failed.
+ \retval #OP_EIMPL An unseekable stream encountered a new link that
+ used a feature that is not implemented, such as
+ an unsupported channel family.
+ \retval #OP_EINVAL The stream was not fully open.
+ \retval #OP_ENOTFORMAT An unseekable stream encountered a new link that
+ contained a link that did not have any logical
+ Opus streams in it.
+ \retval #OP_EBADHEADER An unseekable stream encountered a new link with a
+ required header packet that was not properly
+ formatted, contained illegal values, or was
+ missing altogether.
+ \retval #OP_EVERSION An unseekable stream encountered a new link with
+ an ID header that contained an unrecognized
+ version number.
+ \retval #OP_EBADPACKET Failed to properly decode the next packet.
+ \retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with
+ a starting timestamp that failed basic validity
+ checks.*/
+int op_read_float(OggOpusFile *_of,float *_pcm,int _buf_size,int *_li);
+
+long op_read_filter(OggOpusFile *_of,char *buffer,int length,
+ int bigendianp,int word,int sgned,int *bitstream,
+ void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param);
+
+# if OP_GNUC_PREREQ(4,0)
+# pragma GCC visibility pop
+# endif
+
+# if defined(__cplusplus)
+}
+# endif
+
+#endif
--- /dev/null
+++ b/src/info.c
@@ -1,0 +1,170 @@
+#include "internal.h"
+#include <limits.h>
+#include <string.h>
+
+static unsigned op_parse_uint16le(const unsigned char *_data){+ return _data[0]|_data[1]<<8;
+}
+
+static int op_parse_int16le(const unsigned char *_data){+ int ret;
+ ret=_data[0]|_data[1]<<8;
+ return (ret^0x8000)-0x8000;
+}
+
+static opus_uint32 op_parse_uint32le(const unsigned char *_data){+ return _data[0]|_data[1]<<8|_data[2]<<16|_data[3]<<24;
+}
+
+int opus_head_parse(OpusHead *_head,const unsigned char *_data,size_t _len){+ OpusHead head;
+ if(_len<8)return OP_ENOTFORMAT;
+ if(memcmp(_data,"OpusHead",8)!=0)return OP_ENOTFORMAT;
+ if(_len<9)return OP_EBADHEADER;
+ head.version=_data[8];
+ if(head.version>15)return OP_EVERSION;
+ if(_len<19)return OP_EBADHEADER;
+ head.channel_count=_data[9];
+ head.pre_skip=op_parse_uint16le(_data+10);
+ head.input_sample_rate=op_parse_uint32le(_data+12);
+ head.output_gain=op_parse_int16le(_data+16);
+ head.mapping_family=_data[18];
+ if(head.mapping_family==0){+ if(head.channel_count<1||head.channel_count>2)return OP_EBADHEADER;
+ if(head.version<=1&&_len>19)return OP_EBADHEADER;
+ head.stream_count=1;
+ head.coupled_count=head.channel_count-1;
+ if(_head!=NULL){+ _head->mapping[0]=0;
+ _head->mapping[1]=1;
+ }
+ }
+ else if(head.mapping_family==1){+ size_t size;
+ int ci;
+ if(head.channel_count<1||head.channel_count>8)return OP_EBADHEADER;
+ size=21+head.channel_count;
+ if(_len<size||head.version<=1&&_len>size)return OP_EBADHEADER;
+ head.stream_count=_data[19];
+ if(head.stream_count<1)return OP_EBADHEADER;
+ head.coupled_count=_data[20];
+ if(head.coupled_count>head.stream_count)return OP_EBADHEADER;
+ for(ci=0;ci<head.channel_count;ci++){+ if(_data[21+ci]>=head.stream_count+head.coupled_count
+ &&_data[21+ci]!=255){+ return OP_EBADHEADER;
+ }
+ }
+ if(_head!=NULL)memcpy(_head->mapping,_data+21,head.channel_count);
+ }
+ /*General purpose players should not attempt to play back content with
+ channel mapping family 255.*/
+ else if(head.mapping_family==255)return OP_EIMPL;
+ /*No other channel mapping families are currently defined.*/
+ else return OP_EBADHEADER;
+ if(_head!=NULL)memcpy(_head,&head,head.mapping-(unsigned char *)&head);
+ return 0;
+}
+
+void opus_tags_init(OpusTags *_tags){+ memset(_tags,0,sizeof(*_tags));
+}
+
+void opus_tags_clear(OpusTags *_tags){+ int i;
+ for(i=_tags->comments;i-->0;)_ogg_free(_tags->user_comments[i]);
+ _ogg_free(_tags->user_comments);
+ _ogg_free(_tags->comment_lengths);
+ _ogg_free(_tags->vendor);
+}
+
+/*The actual implementation of opus_tags_parse().
+ Unlike the public API, this function requires _tags to already be
+ initialized, modifies its contents before success is guaranteed, and assumes
+ the caller will clear it on error.*/
+int opus_tags_parse_impl(OpusTags *_tags,
+ const unsigned char *_data,size_t _len){+ opus_uint32 count;
+ size_t size;
+ size_t len;
+ int ncomments;
+ int i;
+ len=_len;
+ if(len<8)return OP_ENOTFORMAT;
+ if(memcmp(_data,"OpusTags",8)!=0)return OP_ENOTFORMAT;
+ if(len<16)return OP_EBADHEADER;
+ _data+=8;
+ len-=8;
+ count=op_parse_uint32le(_data);
+ _data+=4;
+ len-=4;
+ if(count>len)return OP_EBADHEADER;
+ if(_tags!=NULL){+ char *vendor;
+ size=count+1;
+ if(size<count)return OP_EFAULT;
+ vendor=(char *)_ogg_malloc(size);
+ if(vendor==NULL)return OP_EFAULT;
+ memcpy(vendor,_data,count);
+ vendor[count]='\0';
+ _tags->vendor=vendor;
+ }
+ _data+=count;
+ len-=count;
+ if(len<4)return OP_EBADHEADER;
+ count=op_parse_uint32le(_data);
+ _data+=4;
+ len-=4;
+ /*Check to make sure there's minimally sufficient data left in the packet.*/
+ if(count>len>>2)return OP_EBADHEADER;
+ /*Check for overflow (the API limits this to an int).*/
+ if(count>(opus_uint32)INT_MAX)return OP_EFAULT;
+ if(_tags!=NULL){+ size=sizeof(*_tags->comment_lengths)*count;
+ if(size/sizeof(*_tags->comment_lengths)!=count)return OP_EFAULT;
+ _tags->comment_lengths=(int *)_ogg_malloc(size);
+ size=sizeof(*_tags->user_comments)*count;
+ if(size/sizeof(*_tags->user_comments)!=count)return OP_EFAULT;
+ _tags->user_comments=(char **)_ogg_malloc(size);
+ if(_tags->comment_lengths==NULL||_tags->user_comments==NULL){+ return OP_EFAULT;
+ }
+ }
+ ncomments=(int)count;
+ for(i=0;i<ncomments;i++){+ /*Check to make sure there's minimally sufficient data left in the packet.*/
+ if((size_t)(ncomments-i)>len>>2)return OP_EBADHEADER;
+ count=op_parse_uint32le(_data);
+ _data+=4;
+ len-=4;
+ if(count>len)return OP_EBADHEADER;
+ /*Check for overflow (the API limits this to an int).*/
+ if(count>(opus_uint32)INT_MAX)return OP_EFAULT;
+ if(_tags!=NULL){+ _tags->comment_lengths[i]=(int)count;
+ size=count+1;
+ if(size<count)return OP_EFAULT;
+ _tags->user_comments[i]=(char *)_ogg_malloc(size);
+ if(_tags->user_comments[i]==NULL)return OP_EFAULT;
+ _tags->comments=i+1;
+ memcpy(_tags->user_comments[i],_data,count);
+ _tags->user_comments[i][count]='\0';
+ }
+ _data+=count;
+ len-=count;
+ }
+ return 0;
+}
+
+int opus_tags_parse(OpusTags *_tags,const unsigned char *_data,size_t _len){+ if(_tags!=NULL){+ OpusTags tags;
+ int ret;
+ opus_tags_init(&tags);
+ ret=opus_tags_parse_impl(&tags,_data,_len);
+ if(ret<0)opus_tags_clear(&tags);
+ else *_tags=*&tags;
+ return ret;
+ }
+ else return opus_tags_parse_impl(NULL,_data,_len);
+}
--- /dev/null
+++ b/src/internal.c
@@ -1,0 +1,9 @@
+#include "internal.h"
+
+#if defined(OP_ENABLE_ASSERTIONS)
+void op_fatal_impl(const char *_str,const char *_file,int _line){+ fprintf(stderr,"Fatal (internal) error in %s, line %i: %s\n",
+ _file,_line,_str);
+ abort();
+}
+#endif
--- /dev/null
+++ b/src/internal.h
@@ -1,0 +1,185 @@
+#if !defined(_opusfile_internal_h)
+# define _opusfile_internal_h (1)
+
+# if !defined(_REENTRANT)
+# define _REENTRANT
+# endif
+# if !defined(_GNU_SOURCE)
+# define _GNU_SOURCE
+# endif
+# if !defined(_LARGEFILE_SOURCE)
+# define _LARGEFILE_SOURCE
+# endif
+# if !defined(_LARGEFILE64_SOURCE)
+# define _LARGEFILE64_SOURCE
+# endif
+# if !defined(_FILE_OFFSET_BITS)
+# define _FILE_OFFSET_BITS 64
+# endif
+
+# include <stdlib.h>
+# include <opus/opusfile.h>
+
+typedef struct OggOpusLink OggOpusLink;
+# if defined(OP_FIXED_POINT)
+typedef opus_int16 op_sample;
+# else
+typedef float op_sample;
+# endif
+
+# if OP_GNUC_PREREQ(3,0)
+/*Another alternative is
+ (__builtin_constant_p(_x)?!!(_x):__builtin_expect(!!(_x),1))
+ but that evaluates _x multiple times, which may be bad.*/
+# define OP_LIKELY(_x) (__builtin_expect(!!(_x),1))
+# define OP_UNLIKELY(_x) (__builtin_expect(!!(_x),0))
+# else
+# define OP_LIKELY(_x) (!!(_x))
+# define OP_UNLIKELY(_x) (!!(_x))
+# endif
+
+# define OP_INT64_MAX ((ogg_int64_t)0x7FFFFFFFFFFFFFFFLL)
+# define OP_INT64_MIN (-OP_INT64_MAX-1)
+
+/*The maximum channel count for any mapping we'll actually decode.*/
+# define OP_NCHANNELS_MAX (8)
+
+# if defined(OP_ENABLE_ASSERTIONS)
+# if OP_GNUC_PREREQ(2,5)||__SUNPRO_C>=0x590
+__attribute__((noreturn))
+# endif
+void op_fatal_impl(const char *_str,const char *_file,int _line);
+
+# define OP_FATAL(_str) (op_fatal_impl(_str,__FILE__,__LINE__))
+
+# define OP_ASSERT(_cond) \
+ do{ \+ if(OP_UNLIKELY(!(_cond)))OP_FATAL("assertion failed: " #_cond); \+ } \
+ while(0)
+
+# else
+# define OP_FATAL(_str) abort()
+# define OP_ASSERT(_cond)
+# endif
+
+# define OP_MIN(_a,_b) ((_a)<(_b)?(_a):(_b))
+# define OP_MAX(_a,_b) ((_a)>(_b)?(_a):(_b))
+# define OP_CLAMP(_lo,_x,_hi) (OP_MAX(_lo,OP_MIN(_x,_hi)))
+
+/*Initial state.*/
+# define OP_NOTOPEN (0)
+/*We've found the first Opus stream in the first link.*/
+# define OP_PARTOPEN (1)
+# define OP_OPENED (2)
+/*We've found the first Opus stream in the current link.*/
+# define OP_STREAMSET (3)
+/*We've initialized the decoder for the chosen Opus stream in the current
+ link.*/
+# define OP_INITSET (4)
+
+/*Information cached for a single link in a chained Ogg Opus file.
+ We choose the first Opus stream encountered in each link to play back (and
+ require at least one).*/
+struct OggOpusLink{+ /*The byte offset of the first header page in this link.*/
+ opus_int64 offset;
+ /*The byte offset of the first data page from the chosen Opus stream in this
+ link (after the headers).*/
+ opus_int64 data_offset;
+ /*The byte offset of the last page from the chosen Opus stream in this link.
+ This is used when seeking to ensure we find a page before the last one, so
+ that end-trimming calculations work properly.
+ This is only valid for seekable sources.*/
+ opus_int64 end_offset;
+ /*The granule position of the last sample.
+ This is only valid for seekable sources.*/
+ ogg_int64_t pcm_end;
+ /*The granule position before the first sample.*/
+ ogg_int64_t pcm_start;
+ /*The serial number.*/
+ ogg_uint32_t serialno;
+ /*The contents of the info header.*/
+ OpusHead head;
+ /*The contents of the comment header.*/
+ OpusTags tags;
+};
+
+struct OggOpusFile{+ /*The callbacks used to access the data source.*/
+ OpusFileCallbacks callbacks;
+ /*A FILE *, memory bufer, etc.*/
+ void *source;
+ /*Whether or not we can seek with this data source.*/
+ int seekable;
+ /*The number of links in this chained Ogg Opus file.*/
+ int nlinks;
+ /*The cached information from each link in a chained Ogg Opus file.
+ If source isn't seekable (e.g., it's a pipe), only the current link
+ appears.*/
+ OggOpusLink *links;
+ /*The number of serial numbers from a single link.*/
+ int nserialnos;
+ /*The capacity of the list of serial numbers from a single link.*/
+ int cserialnos;
+ /*Storage for the list of serial numbers from a single link.*/
+ ogg_uint32_t *serialnos;
+ /*This is the current offset of the data processed by the ogg_sync_state.
+ After a seek, this should be set to the target offset so that we can track
+ the byte offsets of subsequent pages.
+ After a call to op_get_next_page(), this will point to the first byte after
+ that page.*/
+ opus_int64 offset;
+ /*The total size of this data source, or -1 if it's unseekable.*/
+ opus_int64 end;
+ /*Used to locate pages in the data source.*/
+ ogg_sync_state oy;
+ /*One of OP_NOTOPEN, OP_PARTOPEN, OP_OPENED, OP_STREAMSET, OP_INITSET.*/
+ int ready_state;
+ /*The current link being played back.*/
+ int cur_link;
+ /*The number of decoded samples to discard from the start of decoding.*/
+ opus_int32 cur_discard_count;
+ /*The granule position of the previous packet (current packet start time).*/
+ ogg_int64_t prev_packet_gp;
+ /*The number of bytes read since the last bitrate query, including framing.*/
+ opus_int64 bytes_tracked;
+ /*The number of samples decoded since the last bitrate query.*/
+ ogg_int64_t samples_tracked;
+ /*Takes physical pages and welds them into a logical stream of packets.*/
+ ogg_stream_state os;
+ /*Re-timestamped packets from a single page.
+ Buffering these relies on the undocumented libogg behavior that ogg_packet
+ pointers remain valid until the next page is submitted to the
+ ogg_stream_state they came from.*/
+ ogg_packet op[255];
+ /*The index of the next packet to return.*/
+ int op_pos;
+ /*The total number of packets available.*/
+ int op_count;
+ /*Central working state for the packet-to-PCM decoder.*/
+ OpusMSDecoder *od;
+ /*The stream count used to initialize the decoder.*/
+ int od_stream_count;
+ /*The coupled stream count used to initialize the decoder.*/
+ int od_coupled_count;
+ /*The channel count used to initialize the decoder.*/
+ int od_channel_count;
+ /*The channel mapping used to initialize the decoder.*/
+ unsigned char od_mapping[OP_NCHANNELS_MAX];
+ /*The buffered data for one decoded packet.*/
+ op_sample *od_buffer;
+ /*The current position in the decoded buffer.*/
+ int od_buffer_pos;
+ /*The number of valid samples in the decoded buffer.*/
+ int od_buffer_size;
+ /*Internal state for dithering float->short output.*/
+#if !defined(OP_FIXED_POINT)
+ float dither_a[OP_NCHANNELS_MAX*4];
+ float dither_b[OP_NCHANNELS_MAX*4];
+ int dither_mute;
+ opus_uint32 dither_seed;
+#endif
+};
+
+#endif
--- /dev/null
+++ b/src/opusfile.c
@@ -1,0 +1,2441 @@
+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE libopusfile SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
+ * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: stdio-based convenience library for opening/seeking/decoding
+ last mod: $Id: vorbisfile.c 17573 2010-10-27 14:53:59Z xiphmont $
+
+ ********************************************************************/
+#include "internal.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <limits.h>
+#include <string.h>
+#include <math.h>
+
+#include "opus/opusfile.h"
+
+/*This implementation is largely based off of libvorbisfile.
+ All of the Ogg bits work roughly the same, though I have made some
+ "improvements" that have not been folded back there, yet.*/
+
+/*A 'chained bitstream' is an Ogg Opus bitstream that contains more than one
+ logical bitstream arranged end to end (the only form of Ogg multiplexing
+ supported by this library.
+ Grouping (parallel multiplexing) is not supported, except to the extent that
+ if there are multiple logical Ogg streams in a single link of the chain, we
+ will ignore all but the first Opus stream we find.*/
+
+/*An Ogg Opus file can be played beginning to end (streamed) without worrying
+ ahead of time about chaining (see opusdec from the opus-tools package).
+ If we have the whole file, however, and want random access
+ (seeking/scrubbing) or desire to know the total length/time of a file, we
+ need to account for the possibility of chaining.*/
+
+/*We can handle things a number of ways.
+ We can determine the entire bitstream structure right off the bat, or find
+ pieces on demand.
+ This library determines and caches structure for the entire bitstream, but
+ builds a virtual decoder on the fly when moving between links in the chain.*/
+
+/*There are also different ways to implement seeking.
+ Enough information exists in an Ogg bitstream to seek to sample-granularity
+ positions in the output.
+ Or, one can seek by picking some portion of the stream roughly in the desired
+ area if we only want coarse navigation through the stream.
+ We implement and expose both strategies.*/
+
+/*Many, many internal helpers.
+ The intention is not to be confusing.
+ Rampant duplication and monolithic function implementation (though we do have
+ some large, omnibus functions still) would be harder to understand anyway.
+ The high level functions are last.
+ Begin grokking near the end of the file if you prefer to read things
+ top-down.*/
+
+/*The maximum number of bytes in a page (including the page headers).*/
+#define OP_PAGE_SIZE (65307)
+/*The default amount to seek backwards per step when trying to find the
+ previous page.
+ This must be at least as large as the maximum size of a page.*/
+#define OP_CHUNK_SIZE (65536)
+/*The maximum amount to seek backwards per step when trying to find the
+ previous page.*/
+#define OP_CHUNK_SIZE_MAX (1024*1024)
+/*A smaller read size is needed for low-rate streaming.*/
+#define OP_READ_SIZE (2048)
+
+int op_test(OpusHead *_head,
+ const unsigned char *_initial_data,size_t _initial_bytes){+ ogg_sync_state oy;
+ char *data;
+ int err;
+ /*The first page of a normal Opus file will be at most 57 bytes (27 Ogg
+ page header bytes + 1 lacing value + 21 Opus header bytes + 8 channel
+ mapping bytes).
+ It will be at least 47 bytes (27 Ogg page header bytes + 1 lacing value +
+ 19 Opus header bytes using channel mapping family 0).
+ If we don't have at least that much data, give up now.*/
+ if(_initial_bytes<47)return OP_FALSE;
+ /*Only proceed if we start with the magic OggS string.
+ This is to prevent us spending a lot of time allocating memory and looking
+ for Ogg pages in non-Ogg files.*/
+ if(memcmp(_initial_data,"OggS",4)!=0)return OP_ENOTFORMAT;
+ ogg_sync_init(&oy);
+ data=ogg_sync_buffer(&oy,_initial_bytes);
+ if(data!=NULL){+ ogg_stream_state os;
+ ogg_page og;
+ int ret;
+ memcpy(data,_initial_data,_initial_bytes);
+ ogg_sync_wrote(&oy,_initial_bytes);
+ ogg_stream_init(&os,-1);
+ err=OP_FALSE;
+ do{+ ogg_packet op;
+ ret=ogg_sync_pageout(&oy,&og);
+ /*Ignore holes.*/
+ if(ret<0)continue;
+ /*Stop if we run out of data.*/
+ if(!ret)break;
+ ogg_stream_reset_serialno(&os,ogg_page_serialno(&og));
+ ogg_stream_pagein(&os,&og);
+ /*Only process the first packet on this page (if it's a BOS packet,
+ it's required to be the only one).*/
+ if(ogg_stream_packetout(&os,&op)==1){+ if(op.b_o_s){+ ret=opus_head_parse(_head,op.packet,op.bytes);
+ /*If this didn't look like Opus, keep going.*/
+ if(ret==OP_ENOTFORMAT)continue;
+ /*Otherwise we're done, one way or another.*/
+ err=ret;
+ }
+ /*We finished parsing the headers.
+ There is no Opus to be found.*/
+ else err=OP_ENOTFORMAT;
+ }
+ }
+ while(err==OP_FALSE);
+ ogg_stream_clear(&os);
+ }
+ else err=OP_EFAULT;
+ ogg_sync_clear(&oy);
+ return err;
+}
+
+/*Read a little more data from the file/pipe into the ogg_sync framer.*/
+static int op_get_data(OggOpusFile *_of){+ char *buffer;
+ int bytes;
+ buffer=ogg_sync_buffer(&_of->oy,OP_READ_SIZE);
+ bytes=(int)(*_of->callbacks.read)(buffer,
+ 1,OP_READ_SIZE,_of->source);
+ if(OP_LIKELY(bytes>0)){+ ogg_sync_wrote(&_of->oy,bytes);
+ return bytes;
+ }
+ return OP_EREAD;
+}
+
+/*Save a tiny smidge of verbosity to make the code more readable.*/
+static int op_seek_helper(OggOpusFile *_of,opus_int64 _offset){+ if(_of->callbacks.seek==NULL||
+ (*_of->callbacks.seek)(_of->source,_offset,SEEK_SET)){+ return OP_EREAD;
+ }
+ _of->offset=_offset;
+ ogg_sync_reset(&_of->oy);
+ return 0;
+}
+
+/*The read/seek functions track absolute position within the stream.*/
+
+/*From the head of the stream, get the next page.
+ _boundary specifies if the function is allowed to fetch more data from the
+ stream (and how much) or only use internally buffered data.
+ _boundary: -1) Unbounded search.
+ 0) Read no additional data.
+ Use only cached data.
+ n) Search for the start of a new page for n bytes.
+ Return: n>=0) Found a page at absolute offset n.
+ OP_FALSE) Hit the _boundary limit.
+ OP_EREAD) Failed to read more data.*/
+static opus_int64 op_get_next_page(OggOpusFile *_of,ogg_page *_og,
+ opus_int64 _boundary){+ if(_boundary>0)_boundary+=_of->offset;
+ for(;;){+ int more;
+ if(_boundary>0&&_of->offset>=_boundary)return OP_FALSE;
+ more=ogg_sync_pageseek(&_of->oy,_og);
+ /*Skipped (-more) bytes.*/
+ if(OP_UNLIKELY(more<0))_of->offset-=more;
+ else if(more==0){+ int ret;
+ /*Send more paramedics.*/
+ if(!_boundary)return OP_FALSE;
+ ret=op_get_data(_of);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ else{+ /*Got a page.
+ Return the offset at the page beginning, advance the internal offset
+ past the page end.*/
+ opus_int64 page_offset;
+ page_offset=_of->offset;
+ _of->offset+=more;
+ return page_offset;
+ }
+ }
+}
+
+#if 0
+/*Find the last page beginning before the current stream cursor position with a
+ valid granule position.
+ This is much dirtier than the above, as Ogg doesn't have any backward search
+ linkage.
+ There is no '_boundary' parameter as it will have to read more data.
+ Return: The offset of the start of the page, or a negative value on failure.
+ OP_EREAD: Failed to read more data (error or EOF).
+ OP_EBADLINK: We read a page, and then went back and couldn't find it
+ again.*/
+static opus_int64 op_get_prev_page(OggOpusFile *_of,ogg_page *_og){+ opus_int64 begin;
+ opus_int64 end;
+ opus_int64 llret;
+ opus_int64 page_offset;
+ opus_int64 original_end;
+ opus_int32 chunk_size;
+ int have_page;
+ int ret;
+ original_end=end=begin=_of->offset;
+ page_offset=-1;
+ have_page=0;
+ chunk_size=OP_CHUNK_SIZE;
+ do{+ OP_ASSERT(chunk_size>=OP_PAGE_SIZE);
+ begin=OP_MAX(begin-chunk_size,0);
+ ret=op_seek_helper(_of,begin);
+ if(OP_UNLIKELY(ret<0))return ret;
+ while(_of->offset<end){+ llret=op_get_next_page(_of,_og,end-_of->offset);
+ if(OP_UNLIKELY(llret<OP_FALSE))return llret;
+ else if(llret==OP_FALSE){+ have_page=0;
+ break;
+ }
+ /*We're only doing this search to get a timestamp, so keep going if the
+ granule position is not valid.*/
+ if(ogg_page_granulepos(_og)==-1)continue;
+ page_offset=llret;
+ have_page=1;
+ }
+ chunk_size=OP_MIN(2*chunk_size,OP_CHUNK_SIZE_MAX);
+ /*Avoid quadratic complexity if we hit an invalid patch of the file.*/
+ end=OP_MIN(begin+OP_PAGE_SIZE-1,original_end);
+ }
+ while(page_offset==-1);
+ /*In a fully compliant, non-multiplexed stream, we'll still be holding the
+ last page.
+ In multiplexed (or noncompliant streams), we will probably have to re-read
+ the last page we saw.*/
+ if(!have_page){+ ret=op_seek_helper(_of,page_offset);
+ if(OP_UNLIKELY(ret<0))return ret;
+ llret=op_get_next_page(_of,_og,OP_CHUNK_SIZE);
+ if(OP_UNLIKELY(llret<0)||OP_UNLIKELY(ogg_page_granulepos(_og)==-1)){+ /*This shouldn't be possible unless the stream data changed out from
+ under us.*/
+ return OP_EBADLINK;
+ }
+ }
+ return page_offset;
+}
+#endif
+
+static int op_add_serialno(ogg_page *_og,
+ ogg_uint32_t **_serialnos,int *_nserialnos,int *_cserialnos){+ ogg_uint32_t *serialnos;
+ int nserialnos;
+ int cserialnos;
+ ogg_uint32_t s;
+ s=ogg_page_serialno(_og);
+ serialnos=*_serialnos;
+ nserialnos=*_nserialnos;
+ cserialnos=*_cserialnos;
+ if(OP_UNLIKELY(nserialnos>=cserialnos)){+ if(OP_UNLIKELY(cserialnos>INT_MAX-1>>1))return OP_EFAULT;
+ cserialnos=2*cserialnos+1;
+ OP_ASSERT(nserialnos<cserialnos);
+ serialnos=_ogg_realloc(serialnos,sizeof(*serialnos)*cserialnos);
+ if(OP_UNLIKELY(serialnos==NULL))return OP_EFAULT;
+ }
+ serialnos[nserialnos++]=s;
+ *_serialnos=serialnos;
+ *_nserialnos=nserialnos;
+ *_cserialnos=cserialnos;
+ return 0;
+}
+
+/*Returns nonzero if found.*/
+static int op_lookup_serialno(ogg_uint32_t _s,
+ const ogg_uint32_t *_serialnos,int _nserialnos){+ int i;
+ for(i=0;i<_nserialnos&&_serialnos[i]!=_s;i++);
+ return i<_nserialnos;
+}
+
+static int op_lookup_page_serialno(ogg_page *_og,
+ const ogg_uint32_t *_serialnos,int _nserialnos){+ return op_lookup_serialno(ogg_page_serialno(_og),_serialnos,_nserialnos);
+}
+
+/*Performs the same search as op_get_prev_page(), but prefers pages of the
+ specified serial number.
+ If a page of the specified serial number is spotted during the
+ seek-back-and-read-forward, it will return the info of last page of the
+ matching serial number, instead of the very last page.
+ If no page of the specified serial number is seen, it will return the info of
+ the last page and update *_serialno.*/
+static opus_int64 op_get_prev_page_serial(OggOpusFile *_of,
+ const ogg_uint32_t *_serialnos,int _nserialnos,opus_int32 *_chunk_size,
+ ogg_uint32_t *_serialno,ogg_int64_t *_gp){+ ogg_page og;
+ opus_int64 begin;
+ opus_int64 end;
+ opus_int64 original_end;
+ opus_int64 offset;
+ opus_int64 preferred_offset;
+ ogg_uint32_t preferred_serialno;
+ ogg_int64_t ret_serialno;
+ ogg_int64_t ret_gp;
+ opus_int32 chunk_size;
+ original_end=end=begin=_of->offset;
+ preferred_offset=offset=-1;
+ ret_serialno=-1;
+ ret_gp=-1;
+ preferred_serialno=*_serialno;
+ chunk_size=_chunk_size==NULL?OP_CHUNK_SIZE:*_chunk_size;
+ do{+ int ret;
+ OP_ASSERT(chunk_size>=OP_PAGE_SIZE);
+ begin=OP_MAX(begin-chunk_size,0);
+ ret=op_seek_helper(_of,begin);
+ if(OP_UNLIKELY(ret<0))return ret;
+ while(_of->offset<end){+ opus_int64 llret;
+ llret=op_get_next_page(_of,&og,end-_of->offset);
+ if(OP_UNLIKELY(llret<OP_FALSE))return llret;
+ else if(llret==OP_FALSE)break;
+ ret_serialno=ogg_page_serialno(&og);
+ ret_gp=ogg_page_granulepos(&og);
+ offset=llret;
+ if(ret_serialno==preferred_serialno){+ preferred_offset=offset;
+ *_gp=ret_gp;
+ }
+ if(!op_lookup_serialno(ret_serialno,_serialnos,_nserialnos)){+ /*We fell off the end of the link, which means we seeked back too far
+ and shouldn't have been looking in that link to begin with.
+ If we found the preferred serial number, forget that we saw it.*/
+ preferred_offset=-1;
+ }
+ }
+ /*We started from the beginning of the stream and found nothing.
+ This should be impossible unless the contents of the source changed out
+ from under us after we read from it.*/
+ if(OP_UNLIKELY(!begin)&&OP_UNLIKELY(offset==-1))return OP_EBADLINK;
+ /*Bump up the chunk size.
+ This is mildly helpful when seeks are very expensive (http).*/
+ chunk_size=OP_MIN(2*chunk_size,OP_CHUNK_SIZE_MAX);
+ /*Avoid quadratic complexity if we hit an invalid patch of the file.*/
+ end=OP_MIN(begin+OP_PAGE_SIZE-1,original_end);
+ }
+ while(offset==-1);
+ if(_chunk_size!=NULL)*_chunk_size=chunk_size;
+ /*We're not interested in the page... just the serial number, byte offset,
+ and granule position.*/
+ if(preferred_offset>=0)return preferred_offset;
+ *_serialno=ret_serialno;
+ *_gp=ret_gp;
+ return offset;
+}
+
+/*Uses the local ogg_stream storage in _of.
+ This is important for non-streaming input sources.*/
+static int op_fetch_headers_impl(OggOpusFile *_of,OpusHead *_head,
+ OpusTags *_tags,ogg_uint32_t **_serialnos,int *_nserialnos,
+ int *_cserialnos,ogg_page *_og){+ ogg_packet op;
+ int ret;
+ if(_serialnos!=NULL)*_nserialnos=0;
+ /*Extract the serialnos of all BOS pages plus the first set of Opus headers
+ we see in the link.*/
+ while(ogg_page_bos(_og)){+ opus_int64 llret;
+ if(_serialnos!=NULL){+ if(OP_UNLIKELY(op_lookup_page_serialno(_og,*_serialnos,*_nserialnos))){+ /*A dupe serialnumber in an initial header packet set==invalid stream.*/
+ return OP_EBADHEADER;
+ }
+ ret=op_add_serialno(_og,_serialnos,_nserialnos,_cserialnos);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ if(_of->ready_state<OP_STREAMSET){+ /*We don't have an Opus stream in this link yet, so begin prospective
+ stream setup.
+ We need a stream to get packets.*/
+ ogg_stream_reset_serialno(&_of->os,ogg_page_serialno(_og));
+ ogg_stream_pagein(&_of->os,_og);
+ if(OP_LIKELY(ogg_stream_packetout(&_of->os,&op)>0)){+ ret=opus_head_parse(_head,op.packet,op.bytes);
+ /*If it's just a stream type we don't recognize, ignore it.*/
+ if(ret==OP_ENOTFORMAT)continue;
+ /*Everything else is fatal.*/
+ if(OP_UNLIKELY(ret<0))return ret;
+ /*Found a valid Opus header.
+ Continue setup.*/
+ _of->ready_state=OP_STREAMSET;
+ }
+ }
+ /*Get the next page.*/
+ llret=op_get_next_page(_of,_og,OP_CHUNK_SIZE);
+ if(OP_UNLIKELY(llret<0))return OP_ENOTFORMAT;
+ /*If this page also belongs to our Opus stream, submit it and break.*/
+ if(_of->ready_state==OP_STREAMSET
+ &&_of->os.serialno==ogg_page_serialno(_og)){+ ogg_stream_pagein(&_of->os,_og);
+ break;
+ }
+ }
+ if(OP_UNLIKELY(_of->ready_state!=OP_STREAMSET))return OP_ENOTFORMAT;
+ /*Loop getting packets.*/
+ for(;;){+ switch(ogg_stream_packetout(&_of->os,&op)){+ case 0:{+ /*Loop getting pages.*/
+ for(;;){+ if(OP_UNLIKELY(op_get_next_page(_of,_og,OP_CHUNK_SIZE)<0)){+ return OP_EBADHEADER;
+ }
+ /*If this page belongs to the correct stream, go parse it.*/
+ if(_of->os.serialno==ogg_page_serialno(_og)){+ ogg_stream_pagein(&_of->os,_og);
+ break;
+ }
+ /*If the link ends before we see the Opus comment header, abort.*/
+ if(OP_UNLIKELY(ogg_page_bos(_og)))return OP_EBADHEADER;
+ /*Otherwise, keep looking.*/
+ }
+ }break;
+ /*We shouldn't get a hole in the headers!*/
+ case -1:return OP_EBADHEADER;
+ default:{+ /*Got a packet.
+ It should be the comment header.*/
+ ret=opus_tags_parse(_tags,op.packet,op.bytes);
+ if(OP_UNLIKELY(ret<0))return ret;
+ /*Make sure the page terminated at the end of the comment header.
+ If there is another packet on the page, or part of a packet, then
+ reject the stream.
+ Otherwise seekable sources won't be able to seek back to the start
+ properly.*/
+ ret=ogg_stream_packetout(&_of->os,&op);
+ if(OP_UNLIKELY(ret!=0)
+ ||OP_UNLIKELY(_og->header[_og->header_len-1]==255)){+ /*If we fail, the caller assumes our tags are uninitialized.*/
+ opus_tags_clear(_tags);
+ return OP_EBADHEADER;
+ }
+ return 0;
+ }
+ }
+ }
+}
+
+static int op_fetch_headers(OggOpusFile *_of,OpusHead *_head,
+ OpusTags *_tags,ogg_uint32_t **_serialnos,int *_nserialnos,
+ int *_cserialnos,ogg_page *_og){+ ogg_page og;
+ int ret;
+ if(!_og){+ ogg_int64_t llret;
+ llret=op_get_next_page(_of,&og,OP_CHUNK_SIZE);
+ if(OP_UNLIKELY(llret<0))return OP_ENOTFORMAT;
+ _og=&og;
+ }
+ _of->ready_state=OP_OPENED;
+ ret=op_fetch_headers_impl(_of,_head,_tags,_serialnos,_nserialnos,
+ _cserialnos,_og);
+ /*Revert back from OP_STREAMSET to OP_OPENED on failure, to prevent
+ double-free of the tags in an unseekable stream.*/
+ if(OP_UNLIKELY(ret<0))_of->ready_state=OP_OPENED;
+ return ret;
+}
+
+/*Granule position manipulation routines.
+ A granule position is defined to be an unsigned 64-bit integer, with the
+ special value -1 in two's complement indicating an unset or invalid granule
+ position.
+ We are not guaranteed to have an unsigned 64-bit type, so we construct the
+ following routines that
+ a) Properly order negative numbers as larger than positive numbers, and
+ b) Check for underflow or overflow past the special -1 value.
+ This lets us operate on the full, valid range of granule positions in a
+ consistent and safe manner.
+ This full range is organized into distinct regions:
+ [ -1 (invalid) ][ 0 ... OP_INT64_MAX ][ OP_INT64_MIN ... -2 ][-1 (invalid) ]
+
+ No one should actually use granule positions so large that they're negative,
+ even if they are technically valid, as very little software handles them
+ correctly (including most of Xiph.Org's).
+ This library also refuses to support durations so large they won't fit in a
+ signed 64-bit integer (to avoid exposing this mess to the application, and
+ to simplify a good deal of internal arithmetic), so the only way to use them
+ successfully is if pcm_start is very large.
+ This means there isn't anything you can do with negative granule positions
+ that you couldn't have done with purely non-negative ones.
+ The main purpose of these routines is to allow us to think very explicitly
+ about the possible failure cases of all granule position manipulations.*/
+
+/*Safely adds a small signed integer to a valid (not -1) granule position.
+ The result can use the full 64-bit range of values (both positive and
+ negative), but will fail on overflow (wrapping past -1; wrapping past
+ OP_INT64_MAX is explicitly okay).
+ [out] _dst_gp: The resulting granule position.
+ Only modified on success.
+ _src_gp: The granule position to add to.
+ This must not be -1.
+ _delta: The amount to add.
+ This is allowed to be up to 32 bits to support the maximum
+ duration of a single Ogg page (255 packets * 120 ms per
+ packet == 1,468,800 samples at 48 kHz).
+ Return: 0 on success, or OP_EINVAL if the result would wrap around past -1.*/
+static int op_granpos_add(ogg_int64_t *_dst_gp,ogg_int64_t _src_gp,
+ opus_int32 _delta){+ /*The code below handles this case correctly, but there's no reason we
+ should ever be called with these values, so make sure we aren't.*/
+ OP_ASSERT(_src_gp!=-1);
+ if(_delta>0){+ /*Adding this amount to the granule position would overflow its 64-bit
+ range.*/
+ if(OP_UNLIKELY(_src_gp<0)&&OP_UNLIKELY(_src_gp>=-1-_delta))return OP_EINVAL;
+ if(OP_UNLIKELY(_src_gp>OP_INT64_MAX-_delta)){+ /*Adding this amount to the granule position would overflow the positive
+ half of its 64-bit range.
+ Since signed overflow is undefined in C, do it in a way the compiler
+ isn't allowed to screw up.*/
+ _delta-=(opus_int32)(OP_INT64_MAX-_src_gp)+1;
+ _src_gp=OP_INT64_MIN;
+ }
+ }
+ else if(_delta<0){+ /*Subtracting this amount from the granule position would underflow its
+ 64-bit range.*/
+ if(_src_gp>=0&&OP_UNLIKELY(_src_gp<-_delta))return OP_EINVAL;
+ if(OP_UNLIKELY(_src_gp<OP_INT64_MIN-_delta)){+ /*Subtracting this amount from the granule position would underflow the
+ negative half of its 64-bit range.
+ Since signed underflow is undefined in C, do it in a way the compiler
+ isn't allowed to screw up.*/
+ _delta+=(opus_int32)(_src_gp-OP_INT64_MIN)+1;
+ _src_gp=OP_INT64_MAX;
+ }
+ }
+ *_dst_gp=_src_gp+_delta;
+ return 0;
+}
+
+/*Safely computes the difference between two granule positions.
+ The difference must fit in a signed 64-bit integer, or the function fails.
+ It correctly handles the case where the granule position has wrapped around
+ from positive values to negative ones.
+ [out] _delta: The difference between the granule positions.
+ Only modified on success.
+ _gp_a: The granule position to subtract from.
+ This must not be -1.
+ _gp_b: The granule position to subtract.
+ This must not be -1.
+ Return: 0 on success, or OP_EINVAL if the result would not fit in a signed
+ 64-bit integer.*/
+static int op_granpos_diff(ogg_int64_t *_delta,
+ ogg_int64_t _gp_a,ogg_int64_t _gp_b){+ int gp_a_negative;
+ int gp_b_negative;
+ /*The code below handles these cases correctly, but there's no reason we
+ should ever be called with these values, so make sure we aren't.*/
+ OP_ASSERT(_gp_a!=-1);
+ OP_ASSERT(_gp_b!=-1);
+ gp_a_negative=OP_UNLIKELY(_gp_a<0);
+ gp_b_negative=OP_UNLIKELY(_gp_b<0);
+ if(OP_UNLIKELY(gp_a_negative^gp_b_negative)){+ ogg_int64_t da;
+ ogg_int64_t db;
+ if(gp_a_negative){+ /*_gp_a has wrapped to a negative value but _gp_b hasn't: the difference
+ should be positive.*/
+ /*Step 1: Handle wrapping.*/
+ /*_gp_a < 0 => da < 0.*/
+ da=(OP_INT64_MIN-_gp_a)-1;
+ /*_gp_b >= 0 => db >= 0.*/
+ db=OP_INT64_MAX-_gp_b;
+ /*Step 2: Check for overflow.*/
+ if(OP_UNLIKELY(OP_INT64_MAX+da<db))return OP_EINVAL;
+ *_delta=db-da;
+ }
+ else{+ /*_gp_b has wrapped to a negative value but _gp_a hasn't: the difference
+ should be negative.*/
+ /*Step 1: Handle wrapping.*/
+ /*_gp_a >= 0 => da <= 0*/
+ da=_gp_a+OP_INT64_MIN;
+ /*_gp_b < 0 => db <= 0*/
+ db=OP_INT64_MIN-_gp_b;
+ /*Step 2: Check for overflow.*/
+ if(OP_UNLIKELY(da<OP_INT64_MIN-db))return OP_EINVAL;
+ *_delta=da+db;
+ }
+ }
+ else *_delta=_gp_a-_gp_b;
+ return 0;
+}
+
+static int op_granpos_cmp(ogg_int64_t _gp_a,ogg_int64_t _gp_b){+ /*The invalid granule position -1 should behave like NaN: neither greater
+ than nor less than any other granule position, nor equal to any other
+ granule position, including itself.
+ However, that means there isn't anything we could sensibly return from this
+ function for it.*/
+ OP_ASSERT(_gp_a!=-1);
+ OP_ASSERT(_gp_b!=-1);
+ /*Handle the wrapping cases.*/
+ if(OP_UNLIKELY(_gp_a<0)){+ if(_gp_b>=0)return 1;
+ /*Else fall through.*/
+ }
+ else if(OP_UNLIKELY(_gp_b<0))return -1;
+ /*No wrapping case.*/
+ return (_gp_a>_gp_b)-(_gp_b>_gp_a);
+}
+
+/*Returns the duration of the packet (in samples at 48 kHz), or a negative
+ value on error.*/
+static int op_get_packet_duration(const unsigned char *_data,int _len){+ int nframes;
+ int frame_size;
+ int nsamples;
+ nframes=opus_packet_get_nb_frames(_data,_len);
+ if(OP_UNLIKELY(nframes<0))return OP_EBADPACKET;
+ frame_size=opus_packet_get_samples_per_frame(_data,48000);
+ nsamples=nframes*frame_size;
+ if(OP_UNLIKELY(nsamples>120*48))return OP_EBADPACKET;
+ return nsamples;
+}
+
+/*This function more properly belongs in info.c, but we define it here to allow
+ the static granule position manipulation functions to remain static.*/
+ogg_int64_t opus_granule_sample(const OpusHead *_head,ogg_int64_t _gp){+ opus_int32 pre_skip;
+ pre_skip=_head->pre_skip;
+ if(_gp!=-1&&op_granpos_add(&_gp,_gp,-pre_skip))_gp=-1;
+ return _gp;
+}
+
+/*Grab all the packets currently in the stream state, and compute their
+ durations.
+ _of->op_count is set to the number of packets collected.
+ [out] _durations: Returns the durations of the individual packets.
+ Return: The total duration of all packets, or OP_HOLE if there was a hole.*/
+static opus_int32 op_collect_audio_packets(OggOpusFile *_of,
+ int _durations[255]){+ opus_int32 total_duration;
+ int op_count;
+ /*Count the durations of all packets in the page.*/
+ op_count=0;
+ total_duration=0;
+ for(;;){+ int ret;
+ /*Unless libogg is broken, we can't get more than 255 packets from a
+ single page.*/
+ OP_ASSERT(op_count<255);
+ /*This takes advantage of undocumented libogg behavior that returned
+ ogg_packet buffers are valid at least until the next page is
+ submitted.
+ Relying on this is not too terrible, as _none_ of the Ogg memory
+ ownership/lifetime rules are well-documented.
+ But I can read its code and know this will work.*/
+ ret=ogg_stream_packetout(&_of->os,_of->op+op_count);
+ if(!ret)break;
+ if(OP_UNLIKELY(ret<0)){+ /*We shouldn't get holes in the middle of pages.*/
+ OP_ASSERT(op_count==0);
+ return OP_HOLE;
+ }
+ _durations[op_count]=op_get_packet_duration(_of->op[op_count].packet,
+ _of->op[op_count].bytes);
+ if(OP_LIKELY(_durations[op_count]>0)){+ /*With at most 255 packets on a page, this can't overflow.*/
+ total_duration+=_durations[op_count++];
+ }
+ /*Ignore packets with an invalid TOC sequence.*/
+ }
+ _of->op_pos=0;
+ _of->op_count=op_count;
+ return total_duration;
+}
+
+/*Starting from current cursor position, get the initial PCM offset of the next
+ page.
+ This also validates the granule position on the first page with a completed
+ audio data packet, as required by the spec.
+ If this link is completely empty (no pages with completed packets), then this
+ function sets pcm_start=pcm_end=0 and returns the BOS page of the next link
+ (if any).
+ In the seekable case, we initialize pcm_end=-1 before calling this function,
+ so that later we can detect that the link was empty before calling
+ op_find_final_pcm_offset().
+ [inout] _link: The link for which to find pcm_start.
+ [out] _og: Returns the BOS page of the next link if this link was empty.
+ In the unseekable case, we can then feed this to
+ op_fetch_headers() to start the next link.
+ The caller may pass NULL (e.g., for seekable streams), in
+ which case this page will be discarded.
+ Return: 0 on success, 1 if there is a buffered BOS page available, or a
+ negative value on unrecoverable error.*/
+static int op_find_initial_pcm_offset(OggOpusFile *_of,
+ OggOpusLink *_link,ogg_page *_og){+ ogg_page og;
+ ogg_int64_t pcm_start;
+ ogg_int64_t prev_packet_gp;
+ ogg_int64_t cur_page_gp;
+ ogg_uint32_t serialno;
+ opus_int32 total_duration;
+ int durations[255];
+ int cur_page_eos;
+ int op_count;
+ int pi;
+ if(_og==NULL)_og=&og;
+ serialno=_of->os.serialno;
+ cur_page_gp=-1;
+ do{+ /*We should get a page unless the file is truncated or mangled.
+ Otherwise there are no audio data packets in the whole logical stream.*/
+ if(OP_UNLIKELY(op_get_next_page(_of,_og,-1)<0)){+ /*Fail if the pre-skip is non-zero, since it's asking us to skip more
+ samples than exist.*/
+ if(_link->head.pre_skip>0)return OP_EBADTIMESTAMP;
+ /*Set pcm_end and end_offset so we can skip the call to
+ op_find_final_pcm_offset().*/
+ _link->pcm_start=_link->pcm_end=0;
+ _link->end_offset=_link->data_offset;
+ return 0;
+ }
+ /*Similarly, if we hit the next link in the chain, we've gone too far.*/
+ if(OP_UNLIKELY(ogg_page_bos(_og))){+ if(_link->head.pre_skip>0)return OP_EBADTIMESTAMP;
+ /*Set pcm_end and end_offset so we can skip the call to
+ op_find_final_pcm_offset().*/
+ _link->pcm_end=_link->pcm_start=0;
+ _link->end_offset=_link->data_offset;
+ /*Tell the caller we've got a buffered page for them.*/
+ return 1;
+ }
+ /*Ignore pages from other streams (not strictly necessary, because of the
+ checks in ogg_stream_pagein(), but saves some work).*/
+ if(serialno!=(ogg_uint32_t)ogg_page_serialno(_og))continue;
+ ogg_stream_pagein(&_of->os,_og);
+ /*Bitrate tracking: add the header's bytes here.
+ The body bytes are counted when we consume the packets.*/
+ _of->bytes_tracked+=_og->header_len;
+ /*Count the durations of all packets in the page.*/
+ do total_duration=op_collect_audio_packets(_of,durations);
+ /*Ignore holes.*/
+ while(OP_UNLIKELY(total_duration<0));
+ op_count=_of->op_count;
+ }
+ while(op_count<=0);
+ /*We found the first page with a completed audio data packet: actually look
+ at the granule position.
+ RFC 3533 says, "A special value of -1 (in two's complement) indicates that
+ no packets finish on this page," which does not say that a granule
+ position that is NOT -1 indicates that some packets DO finish on that page
+ (even though this was the intention, libogg itself violated this intention
+ for years before we fixed it).
+ The Ogg Opus specification only imposes its start-time requirements
+ on the granule position of the first page with completed packets,
+ so we ignore any set granule positions until then.*/
+ cur_page_gp=_of->op[op_count-1].granulepos;
+ /*But getting a packet without a valid granule position on the page is not
+ okay.*/
+ if(cur_page_gp==-1)return OP_EBADTIMESTAMP;
+ cur_page_eos=_of->op[op_count-1].e_o_s;
+ if(OP_LIKELY(!cur_page_eos)){+ /*The EOS flag wasn't set.
+ Work backwards from the provided granule position to get the starting PCM
+ offset.*/
+ if(OP_UNLIKELY(op_granpos_add(&pcm_start,cur_page_gp,-total_duration)<0)){+ /*The starting granule position MUST not be smaller than the amount of
+ audio on the first page with completed packets.*/
+ return OP_EBADTIMESTAMP;
+ }
+ }
+ else{+ /*The first page with completed packets was also the last.*/
+ if(OP_LIKELY(op_granpos_add(&pcm_start,cur_page_gp,-total_duration)<0)){+ /*If there's less audio on the page than indicated by the granule
+ position, then we're doing end-trimming, and the starting PCM offset
+ is zero by spec mandate.*/
+ pcm_start=0;
+ /*However, the end-trimming MUST not ask us to trim more samples than
+ exist after applying the pre-skip.*/
+ if(OP_UNLIKELY(op_granpos_cmp(cur_page_gp,_link->head.pre_skip)<0)){+ return OP_EBADTIMESTAMP;
+ }
+ }
+ }
+ /*Timestamp the individual packets.*/
+ prev_packet_gp=pcm_start;
+ for(pi=0;pi<op_count;pi++){+ int ret;
+ if(cur_page_eos){+ ogg_int64_t diff;
+ ret=op_granpos_diff(&diff,cur_page_gp,prev_packet_gp);
+ OP_ASSERT(!ret);
+ diff=durations[pi]-diff;
+ /*If we have samples to trim...*/
+ if(diff>0){+ /*If we trimmed the entire packet, stop (the spec says encoders
+ shouldn't do this, but we support it anyway).*/
+ if(OP_UNLIKELY(diff>durations[pi]))break;
+ _of->op[pi].granulepos=prev_packet_gp=cur_page_gp;
+ /*Move the EOS flag to this packet, if necessary, so we'll trim the
+ samples.*/
+ _of->op[pi].e_o_s=1;
+ continue;
+ }
+ }
+ /*Update the granule position as normal.*/
+ ret=op_granpos_add(&_of->op[pi].granulepos,
+ prev_packet_gp,durations[pi]);
+ OP_ASSERT(!ret);
+ prev_packet_gp=_of->op[pi].granulepos;
+ }
+ /*Update the packet count after end-trimming.*/
+ _of->op_count=pi;
+ _of->cur_discard_count=_link->head.pre_skip;
+ _of->prev_packet_gp=_link->pcm_start=pcm_start;
+ return 0;
+}
+
+/*Starting from current cursor position, get the final PCM offset of the
+ previous page.
+ This also validates the duration of the link, which, while not strictly
+ required by the spec, we need to ensure duration calculations don't
+ overflow.
+ This is only done for seekable sources.
+ We must validate that op_find_initial_pcm_offset() succeeded for this link
+ before calling this function, otherwise it will scan the entire stream
+ backwards until it reaches the start, and then fail.*/
+static int op_find_final_pcm_offset(OggOpusFile *_of,
+ const ogg_uint32_t *_serialnos,int _nserialnos,OggOpusLink *_link,
+ ogg_int64_t _end_gp,ogg_uint32_t _end_serialno,ogg_int64_t *_total_duration){+ opus_int64 offset;
+ ogg_int64_t total_duration;
+ ogg_int64_t duration;
+ ogg_uint32_t cur_serialno;
+ ogg_uint32_t test_serialno;
+ opus_int32 chunk_size;
+ /*For the time being, fetch end PCM offset the simple way.*/
+ cur_serialno=_link->serialno;
+ test_serialno=_end_serialno;
+ /*Keep track of the growing chunk size to better handle being multiplexed
+ with another high-bitrate stream.*/
+ chunk_size=OP_CHUNK_SIZE;
+ offset=_of->offset;
+ while(_end_gp==-1||test_serialno!=cur_serialno){+ test_serialno=cur_serialno;
+ _of->offset=offset;
+ offset=op_get_prev_page_serial(_of,_serialnos,_nserialnos,
+ &chunk_size,&test_serialno,&_end_gp);
+ if(OP_UNLIKELY(offset<0))return (int)offset;
+ }
+ /*This implementation requires that difference between the first and last
+ granule positions in each link be representable in a signed, 64-bit
+ number, and that each link also have at least as many samples as the
+ pre-skip requires.*/
+ if(OP_UNLIKELY(op_granpos_diff(&duration,_end_gp,_link->pcm_start)<0)
+ ||OP_UNLIKELY(duration<_link->head.pre_skip)){+ return OP_EBADTIMESTAMP;
+ }
+ /*We also require that the total duration be representable in a signed,
+ 64-bit number.*/
+ duration-=_link->head.pre_skip;
+ total_duration=*_total_duration;
+ if(OP_UNLIKELY(OP_INT64_MAX-duration<total_duration))return OP_EBADTIMESTAMP;
+ *_total_duration=total_duration+duration;
+ _link->pcm_end=_end_gp;
+ _link->end_offset=offset;
+ return 0;
+}
+
+typedef struct op_seek_record op_seek_record;
+
+/*We use this to remember the pages we found while enumerating the links of a
+ chained stream.
+ We only need to know the starting and ending byte offsets and the serial
+ number, so we can tell if the page belonged to the current chain or not,
+ and where to bisect.*/
+struct op_seek_record{+ opus_int64 offset;
+ opus_int32 size;
+ ogg_uint32_t serialno;
+};
+
+/*Finds each bitstream link, one at a time, using a bisection search.
+ This has to begin by knowing the offset of the first link's initial page.*/
+static int op_bisect_forward_serialno(OggOpusFile *_of,
+ opus_int64 _searched,ogg_int64_t _end_gp,op_seek_record *_sr,int _csr,
+ ogg_uint32_t **_serialnos,int *_nserialnos,int *_cserialnos){+ ogg_page og;
+ OggOpusLink *links;
+ int nlinks;
+ int clinks;
+ ogg_uint32_t *serialnos;
+ int nserialnos;
+ opus_int64 begin;
+ ogg_int64_t total_duration;
+ int nsr;
+ int ret;
+ links=_of->links;
+ nlinks=clinks=_of->nlinks;
+ begin=0;
+ total_duration=0;
+ /*We start with one seek record, for the last page in the file.
+ We build up a list of records for places we seek to during link
+ enumeration.
+ This list is kept sorted in reverse order.
+ We only care about seek locations that were _not_ in the current link,
+ therefore we can add them one at a time to the end of the list as we
+ improve the lower bound on the location where the next link starts.*/
+ nsr=1;
+ for(;;){+ opus_int64 data_offset;
+ opus_int64 end_searched;
+ opus_int64 next;
+ opus_int64 last;
+ int sri;
+ serialnos=*_serialnos;
+ nserialnos=*_nserialnos;
+ if(OP_UNLIKELY(nlinks>=clinks)){+ if(OP_UNLIKELY(clinks>INT_MAX-1>>1))return OP_EFAULT;
+ clinks=2*clinks+1;
+ OP_ASSERT(nlinks<clinks);
+ links=_ogg_realloc(links,sizeof(*links)*clinks);
+ if(OP_UNLIKELY(links==NULL))return OP_EFAULT;
+ _of->links=links;
+ }
+ data_offset=_searched;
+ /*Invariants:
+ We have the headers and serial numbers for the link beginning at 'begin'.
+ We have the offset and granule position of the last page in the file
+ (potentially not a page we care about).*/
+ /*Scan the seek records we already have to save us some bisection.*/
+ for(sri=0;sri<nsr;sri++){+ if(op_lookup_serialno(_sr[sri].serialno,*_serialnos,*_nserialnos))break;
+ }
+ /*Is the last page in our current list of serial numbers?*/
+ if(sri<=0)break;
+ /*Last page wasn't found.
+ We have at least one more link.*/
+ end_searched=next=_sr[sri-1].offset;
+ if(sri<nsr)_searched=_sr[sri].offset+_sr[sri].size;
+ nsr=sri;
+ /*We guard against garbage separating the last and first pages of two
+ links below.*/
+ while(_searched<end_searched){+ opus_int64 bisect;
+ if(OP_UNLIKELY(end_searched-_searched<OP_CHUNK_SIZE))bisect=_searched;
+ /*TODO: We might be able to do a better job estimating the start of
+ subsequent links by assuming its initial PCM offset is 0 and using two
+ sightings of the same stream to estimate a bitrate.*/
+ else bisect=_searched+(end_searched-_searched>>1);
+ if(OP_LIKELY(bisect!=_of->offset)){+ ret=op_seek_helper(_of,bisect);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ last=op_get_next_page(_of,&og,-1);
+ /*At the worst we should have hit the page at _sr[sri-1].offset.*/
+ if(OP_UNLIKELY(last<0))return OP_EBADLINK;
+ OP_ASSERT(nsr<_csr);
+ _sr[nsr].serialno=ogg_page_serialno(&og);
+ if(!op_lookup_serialno(_sr[nsr].serialno,serialnos,nserialnos)){+ end_searched=bisect;
+ next=last;
+ /*In reality we should always have enough room, but be paranoid.*/
+ if(OP_LIKELY(nsr+1<_csr)){+ _sr[nsr].offset=last;
+ OP_ASSERT(_of->offset-last>=0);
+ OP_ASSERT(_of->offset-last<=OP_PAGE_SIZE);
+ _sr[nsr].size=(opus_int32)(_of->offset-last);
+ nsr++;
+ }
+ }
+ else _searched=_of->offset;
+ }
+ /*Bisection point found.
+ Get the final granule position of the previous link, assuming
+ op_find_initial_pcm_offset() didn't already determine the link was
+ empty.*/
+ if(OP_LIKELY(links[nlinks-1].pcm_end==-1)){+ _of->offset=next;
+ ret=op_find_final_pcm_offset(_of,serialnos,nserialnos,
+ links+nlinks-1,-1,0,&total_duration);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ /*Restore the cursor position after the seek.
+ This should only be necessary if the last page in the link did not belong
+ to our Opus stream.
+ TODO: Read forward instead, or let seek implementations do that?*/
+ if(_of->offset!=next){+ ret=op_seek_helper(_of,next);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ ret=op_fetch_headers(_of,&links[nlinks].head,&links[nlinks].tags,
+ _serialnos,_nserialnos,_cserialnos,NULL);
+ if(OP_UNLIKELY(ret<0))return ret;
+ links[nlinks].offset=next;
+ links[nlinks].data_offset=_of->offset;
+ links[nlinks].serialno=_of->os.serialno;
+ links[nlinks].pcm_end=-1;
+ /*This might consume a page from the next link, however the next bisection
+ always starts with a seek.*/
+ ret=op_find_initial_pcm_offset(_of,links+nlinks,NULL);
+ if(OP_UNLIKELY(ret<0))return ret;
+ begin=next;
+ _searched=_of->offset;
+ /*Mark the current link count so it can be cleaned up on error.*/
+ _of->nlinks=++nlinks;
+ }
+ /*Last page is in the starting serialno list, so we've reached the last link.
+ Now find the last granule position for it (if we didn't the first time we
+ looked at the end of the stream, and if op_find_initial_pcm_offset()
+ didn't already determine the link was empty).*/
+ if(OP_LIKELY(links[nlinks-1].pcm_end==-1)){+ _of->offset=_sr[0].offset;
+ ret=op_find_final_pcm_offset(_of,serialnos,nserialnos,
+ links+nlinks-1,_end_gp,_sr[0].serialno,&total_duration);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ /*Trim back the links array if necessary.*/
+ links=_ogg_realloc(links,sizeof(*links)*nlinks);
+ if(OP_LIKELY(links!=NULL))_of->links=links;
+ /*We also don't need these anymore.*/
+ _ogg_free(*_serialnos);
+ *_serialnos=NULL;
+ *_cserialnos=*_nserialnos=0;
+ return 0;
+}
+
+static int op_make_decode_ready(OggOpusFile *_of){+ OpusHead *head;
+ int li;
+ int stream_count;
+ int coupled_count;
+ int channel_count;
+ if(_of->ready_state>OP_STREAMSET)return 0;
+ if(OP_UNLIKELY(_of->ready_state<OP_STREAMSET))return OP_EFAULT;
+ li=_of->seekable?_of->cur_link:0;
+ head=&_of->links[li].head;
+ stream_count=head->stream_count;
+ coupled_count=head->coupled_count;
+ channel_count=head->channel_count;
+ /*Check to see if the current decoder is compatible with the current link.*/
+ if(_of->od!=NULL&&_of->od_stream_count==stream_count
+ &&_of->od_coupled_count==coupled_count&&_of->od_channel_count==channel_count
+ &&memcmp(_of->od_mapping,head->mapping,
+ sizeof(*head->mapping)*channel_count)==0){+ opus_multistream_decoder_ctl(_of->od,OPUS_RESET_STATE);
+ }
+ else{+ int err;
+ opus_multistream_decoder_destroy(_of->od);
+ _of->od=opus_multistream_decoder_create(48000,channel_count,
+ stream_count,coupled_count,head->mapping,&err);
+ if(_of->od==NULL)return OP_EFAULT;
+ _of->od_stream_count=stream_count;
+ _of->od_coupled_count=coupled_count;
+ _of->od_channel_count=channel_count;
+ memcpy(_of->od_mapping,head->mapping,sizeof(*head->mapping)*channel_count);
+ }
+ /*TODO: Implement this when not available, or require sufficiently new
+ libopus?*/
+#if defined(OPUS_SET_GAIN)
+ opus_multistream_decoder_ctl(_of->od,OPUS_SET_GAIN(head->output_gain));
+#endif
+ _of->ready_state=OP_INITSET;
+ _of->bytes_tracked=0;
+ _of->samples_tracked=0;
+#if !defined(OP_FIXED_POINT)
+ _of->dither_mute=65;
+ /*Use the serial number for the PRNG seed to get repeatable output for
+ straight play-throughs.*/
+ _of->dither_seed=_of->links[li].serialno;
+#endif
+ return 0;
+}
+
+static int op_open_seekable2(OggOpusFile *_of){+ /*64 seek records should be enough for anybody.
+ Actually, with a bisection search in a 63-bit range down to OP_CHUNK_SIZE
+ granularity, much more than enough.*/
+ op_seek_record sr[64];
+ opus_int64 data_offset;
+ ogg_int64_t end_gp;
+ int ret;
+ /*We're partially open and have a first link header state in storage in _of.*/
+ /*We can seek, so set out learning all about this file.*/
+ (*_of->callbacks.seek)(_of->source,0,SEEK_END);
+ _of->offset=_of->end=(*_of->callbacks.tell)(_of->source);
+ /*Get the offset of the last page of the physical bitstream, or, if we're
+ lucky, the last Opus page of the first link, as most Ogg Opus files will
+ contain a single logical bitstream.*/
+ sr[0].serialno=_of->links[0].serialno;
+ sr[0].offset=op_get_prev_page_serial(_of,_of->serialnos,_of->nserialnos,
+ NULL,&sr[0].serialno,&end_gp);
+ if(OP_UNLIKELY(sr[0].offset<0))return (int)sr[0].offset;
+ /*Now enumerate the bitstream structure.*/
+ OP_ASSERT(_of->offset-sr[0].offset>=0);
+ OP_ASSERT(_of->offset-sr[0].offset<=OP_PAGE_SIZE);
+ sr[0].size=(opus_int32)(_of->offset-sr[0].offset);
+ data_offset=_of->links[0].data_offset;
+ ret=op_bisect_forward_serialno(_of,data_offset,end_gp,sr,
+ sizeof(sr)/sizeof(*sr),&_of->serialnos,&_of->nserialnos,&_of->cserialnos);
+ if(OP_UNLIKELY(ret<0))return ret;
+ /*And seek back to the start of the first link.*/
+ return op_raw_seek(_of,data_offset);
+}
+
+/*Clear out the current logical bitstream decoder.*/
+static void op_decode_clear(OggOpusFile *_of){+ /*We don't actually free the decoder.
+ We might be able to re-use it for the next link.*/
+ _of->op_count=0;
+ _of->od_buffer_size=0;
+ _of->prev_packet_gp=-1;
+ if(!_of->seekable){+ OP_ASSERT(_of->ready_state>=OP_INITSET);
+ opus_tags_clear(&_of->links[0].tags);
+ }
+ _of->ready_state=OP_OPENED;
+}
+
+static void op_clear(OggOpusFile *_of){+ OggOpusLink *links;
+ _ogg_free(_of->od_buffer);
+ if(_of->od!=NULL)opus_multistream_decoder_destroy(_of->od);
+ links=_of->links;
+ if(!_of->seekable){+ if(_of->ready_state>OP_OPENED)opus_tags_clear(&links[0].tags);
+ }
+ else if(OP_LIKELY(links!=NULL)){+ int nlinks;
+ int link;
+ nlinks=_of->nlinks;
+ for(link=0;link<nlinks;link++)opus_tags_clear(&links[link].tags);
+ }
+ _ogg_free(links);
+ _ogg_free(_of->serialnos);
+ ogg_stream_clear(&_of->os);
+ ogg_sync_clear(&_of->oy);
+ if(_of->callbacks.close!=NULL)(*_of->callbacks.close)(_of->source);
+}
+
+static int op_open1(OggOpusFile *_of,
+ void *_source,const OpusFileCallbacks *_cb,
+ const unsigned char *_initial_data,size_t _initial_bytes){+ ogg_page og;
+ ogg_page *pog;
+ int seekable;
+ int ret;
+ memset(_of,0,sizeof(*_of));
+ _of->source=_source;
+ *&_of->callbacks=*_cb;
+ /*At a minimum, we need to be able to read data.*/
+ if(OP_UNLIKELY(_of->callbacks.read==NULL))return OP_EREAD;
+ /*Initialize the framing state.*/
+ ogg_sync_init(&_of->oy);
+ /*Perhaps some data was previously read into a buffer for testing against
+ other stream types.
+ Allow initialization from this previously read data (especially as we may
+ be reading from a non-seekable stream).
+ This requires copying it into a buffer allocated by ogg_sync_buffer() and
+ doesn't support seeking, so this is not a good mechanism to use for
+ decoding entire files from RAM.*/
+ if(_initial_bytes>0){+ char *buffer;
+ buffer=ogg_sync_buffer(&_of->oy,_initial_bytes);
+ memcpy(buffer,_initial_data,_initial_bytes*sizeof(*buffer));
+ ogg_sync_wrote(&_of->oy,_initial_bytes);
+ }
+ /*Can we seek?
+ Stevens suggests the seek test is portable.*/
+ seekable=_cb->seek!=NULL&&(*_cb->seek)(_source,0,SEEK_CUR)!=-1;
+ /*If seek is implemented, tell must also be implemented.*/
+ if(seekable){+ if(OP_UNLIKELY(_of->callbacks.tell==NULL))return OP_EINVAL;
+ else{+ opus_int64 pos;
+ pos=(*_of->callbacks.tell)(_of->source);
+ /*If the current position is not equal to the initial bytes consumed,
+ absolute seeking will not work.*/
+ if(OP_UNLIKELY(pos!=(opus_int64)_initial_bytes))return OP_EINVAL;
+ }
+ }
+ _of->seekable=seekable;
+ /*Don't seek yet.
+ Set up a 'single' (current) logical bitstream entry for partial open.*/
+ _of->nlinks=1;
+ _of->links=(OggOpusLink *)_ogg_malloc(sizeof(*_of->links));
+ /*The serialno gets filled in later by op_fetch_headers().*/
+ ogg_stream_init(&_of->os,-1);
+ pog=NULL;
+ for(;;){+ /*Fetch all BOS pages, store the Opus header and all seen serial numbers,
+ and load subsequent Opus setup headers.*/
+ ret=op_fetch_headers(_of,&_of->links[0].head,&_of->links[0].tags,
+ &_of->serialnos,&_of->nserialnos,&_of->cserialnos,pog);
+ if(OP_UNLIKELY(ret<0))break;
+ _of->links[0].offset=0;
+ _of->links[0].data_offset=_of->offset;
+ _of->links[0].pcm_end=-1;
+ _of->links[0].serialno=_of->os.serialno;
+ /*Fetch the initial PCM offset.*/
+ ret=op_find_initial_pcm_offset(_of,_of->links,&og);
+ if(seekable||OP_LIKELY(ret<=0))break;
+ /*This link was empty, but we already have the BOS page for the next one in
+ og.
+ We can't seek, so start processing the next link right now.*/
+ pog=&og;
+ _of->cur_link++;
+ }
+ if(OP_UNLIKELY(ret<0)){+ /*Don't auto-close the stream on failure.*/
+ _of->callbacks.close=NULL;
+ op_clear(_of);
+ }
+ else _of->ready_state=OP_PARTOPEN;
+ return ret;
+}
+
+static int op_open2(OggOpusFile *_of){+ int ret;
+ OP_ASSERT(_of->ready_state==OP_PARTOPEN);
+ if(_of->seekable){+ _of->ready_state=OP_OPENED;
+ ret=op_open_seekable2(_of);
+ }
+ else{+ /*We have buffered packets from op_find_initial_pcm_offset().
+ Move to OP_INITSET so we can use them.*/
+ _of->ready_state=OP_STREAMSET;
+ ret=op_make_decode_ready(_of);
+ }
+ if(OP_UNLIKELY(ret<0)){+ /*Don't auto-close the stream on failure.*/
+ _of->callbacks.close=NULL;
+ op_clear(_of);
+ return ret;
+ }
+ return 0;
+}
+
+OggOpusFile *op_test_callbacks(void *_source,const OpusFileCallbacks *_cb,
+ const unsigned char *_initial_data,size_t _initial_bytes,int *_error){+ OggOpusFile *of;
+ int ret;
+ of=(OggOpusFile *)_ogg_malloc(sizeof(*of));
+ ret=OP_EFAULT;
+ if(OP_LIKELY(of!=NULL)){+ ret=op_open1(of,_source,_cb,_initial_data,_initial_bytes);
+ if(OP_LIKELY(ret>=0)){+ if(_error!=NULL)*_error=0;
+ return of;
+ }
+ _ogg_free(of);
+ }
+ if(_error!=NULL)*_error=ret;
+ return NULL;
+}
+
+OggOpusFile *op_open_callbacks(void *_source,const OpusFileCallbacks *_cb,
+ const unsigned char *_initial_data,size_t _initial_bytes,int *_error){+ OggOpusFile *of;
+ of=op_test_callbacks(_source,_cb,_initial_data,_initial_bytes,_error);
+ if(OP_LIKELY(of!=NULL)){+ int ret;
+ ret=op_open2(of);
+ if(OP_LIKELY(ret>=0))return of;
+ if(_error!=NULL)*_error=ret;
+ _ogg_free(of);
+ }
+ return NULL;
+}
+
+/*Convenience routine to clean up from failure for the open functions that
+ create their own streams.*/
+static OggOpusFile *op_open_close_on_failure(void *_source,
+ const OpusFileCallbacks *_cb,int *_error){+ OggOpusFile *of;
+ if(OP_UNLIKELY(_source==NULL)){+ if(_error!=NULL)*_error=OP_EFAULT;
+ return NULL;
+ }
+ of=op_open_callbacks(_source,_cb,NULL,0,_error);
+ if(OP_UNLIKELY(of==NULL))(*_cb->close)(_source);
+ return of;
+}
+
+OggOpusFile *op_open_file(const char *_path,int *_error){+ OpusFileCallbacks cb;
+ return op_open_close_on_failure(op_fopen(&cb,_path,"rb"),&cb,_error);
+}
+
+OggOpusFile *op_open_memory(const unsigned char *_data,size_t _size,
+ int *_error){+ OpusFileCallbacks cb;
+ return op_open_close_on_failure(op_mem_stream_create(&cb,_data,_size),&cb,
+ _error);
+}
+
+/*Convenience routine to clean up from failure for the open functions that
+ create their own streams.*/
+static OggOpusFile *op_test_close_on_failure(void *_source,
+ const OpusFileCallbacks *_cb,int *_error){+ OggOpusFile *of;
+ if(OP_UNLIKELY(_source==NULL)){+ if(_error!=NULL)*_error=OP_EFAULT;
+ return NULL;
+ }
+ of=op_test_callbacks(_source,_cb,NULL,0,_error);
+ if(OP_UNLIKELY(of==NULL))(*_cb->close)(_source);
+ return of;
+}
+
+OggOpusFile *op_test_file(const char *_path,int *_error){+ OpusFileCallbacks cb;
+ return op_test_close_on_failure(op_fopen(&cb,_path,"rb"),&cb,_error);
+}
+
+OggOpusFile *op_test_memory(const unsigned char *_data,size_t _size,
+ int *_error){+ OpusFileCallbacks cb;
+ return op_test_close_on_failure(op_mem_stream_create(&cb,_data,_size),&cb,
+ _error);
+}
+
+int op_test_open(OggOpusFile *_of){+ int ret;
+ if(OP_UNLIKELY(_of->ready_state!=OP_PARTOPEN))return OP_EINVAL;
+ ret=op_open2(_of);
+ /*op_open2() will clear this structure on failure.
+ Reset its contents to prevent double-frees in op_free().*/
+ if(OP_UNLIKELY(ret<0))memset(_of,0,sizeof(*_of));
+ return ret;
+}
+
+void op_free(OggOpusFile *_of){+ if(OP_LIKELY(_of!=NULL)){+ op_clear(_of);
+ _ogg_free(_of);
+ }
+}
+
+int op_link_count(OggOpusFile *_of){+ return _of->nlinks;
+}
+
+int op_seekable(OggOpusFile *_of){+ return _of->seekable;
+}
+
+ogg_uint32_t op_serialno(OggOpusFile *_of,int _li){+ if(OP_UNLIKELY(_li>=_of->nlinks))_li=_of->nlinks-1;
+ if(!_of->seekable&&_li!=0)_li=0;
+ return _of->links[_li<0?_of->cur_link:_li].serialno;
+}
+
+int op_channel_count(OggOpusFile *_of,int _li){+ if(OP_UNLIKELY(_li>=_of->nlinks))_li=_of->nlinks-1;
+ if(!_of->seekable&&_li!=0)_li=0;
+ return _of->links[_li<0?_of->cur_link:_li].head.channel_count;
+}
+
+opus_int64 op_raw_total(OggOpusFile *_of,int _li){+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED)
+ ||OP_UNLIKELY(!_of->seekable)
+ ||OP_UNLIKELY(_li>=_of->nlinks)){+ return OP_EINVAL;
+ }
+ if(_li<0)return _of->end-_of->links[0].offset;
+ return (_li+1>=_of->nlinks?_of->end:_of->links[_li+1].offset)
+ -_of->links[_li].offset;
+}
+
+ogg_int64_t op_pcm_total(OggOpusFile *_of,int _li){+ OggOpusLink *links;
+ ogg_int64_t diff;
+ int ret;
+ int nlinks;
+ nlinks=_of->nlinks;
+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED)
+ ||OP_UNLIKELY(!_of->seekable)
+ ||OP_UNLIKELY(_li>=nlinks)){+ return OP_EINVAL;
+ }
+ links=_of->links;
+ /*We verify that the granule position differences are larger than the
+ pre-skip and that the total duration does not overflow during link
+ enumeration, so we don't have to check here.*/
+ if(_li<0){+ ogg_int64_t pcm_total;
+ int li;
+ pcm_total=0;
+ for(li=0;li<nlinks;li++){+ ret=op_granpos_diff(&diff,links[li].pcm_end,links[li].pcm_start);
+ OP_ASSERT(!ret);
+ pcm_total+=diff-links[li].head.pre_skip;
+ }
+ return pcm_total;
+ }
+ ret=op_granpos_diff(&diff,links[_li].pcm_end,links[_li].pcm_start);
+ OP_ASSERT(!ret);
+ return diff-links[_li].head.pre_skip;
+}
+
+const OpusHead *op_head(OggOpusFile *_of,int _li){+ if(!_of->seekable)_li=0;
+ else if(_li<0)_li=_of->ready_state>=OP_STREAMSET?_of->cur_link:0;
+ return _li>=_of->nlinks?NULL:&_of->links[_li].head;
+}
+
+const OpusTags *op_tags(OggOpusFile *_of,int _li){+ if(!_of->seekable)_li=0;
+ else if(_li<0)_li=_of->ready_state>=OP_STREAMSET?_of->cur_link:0;
+ return _li>=_of->nlinks?NULL:&_of->links[_li].tags;
+}
+
+/*Compute an average bitrate given a byte and sample count.
+ Return: The bitrate in bits per second.*/
+static opus_int32 op_calc_bitrate(opus_int64 _bytes,ogg_int64_t _samples){+ /*These rates are absurd, but let's handle them anyway.*/
+ if(OP_UNLIKELY(_bytes>(OP_INT64_MAX-(_samples>>1))/(48000*8))){+ ogg_int64_t den;
+ if(OP_UNLIKELY(_bytes/(0x7FFFFFFFF/(48000*8))>=_samples))return 0x7FFFFFFF;
+ den=_samples/(48000*8);
+ return (_bytes+(den>>1))/den;
+ }
+ if(OP_UNLIKELY(_samples<=0))return 0x7FFFFFFF;
+ /*This can't actually overflow in normal operation: even with a pre-skip of
+ 545 2.5 ms frames with 8 streams running at 1282*8+1 bytes per packet
+ (1275 byte frames + Opus framing overhead + Ogg lacing values), that all
+ produce a single sample of decoded output, we still don't top 45 Mbps.
+ The only way to get bitrates larger than that is with excessive Opus
+ padding, more encoded streams than output channels, or lots and lots of
+ Ogg pages with no packets on them.*/
+ return (opus_int32)OP_MIN((_bytes*48000*8+(_samples>>1))/_samples,0x7FFFFFFF);
+}
+
+opus_int32 op_bitrate(OggOpusFile *_of,int _li){+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED)||OP_UNLIKELY(!_of->seekable)
+ ||OP_UNLIKELY(_li>=_of->nlinks)){+ return OP_EINVAL;
+ }
+ return op_calc_bitrate(op_raw_total(_of,_li),op_pcm_total(_of,_li));
+}
+
+opus_int32 op_bitrate_instant(OggOpusFile *_of){+ ogg_int64_t samples_tracked;
+ opus_int32 ret;
+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED))return OP_EINVAL;
+ samples_tracked=_of->samples_tracked;
+ if(OP_UNLIKELY(samples_tracked==0))return OP_FALSE;
+ ret=op_calc_bitrate(_of->bytes_tracked,samples_tracked);
+ _of->bytes_tracked=0;
+ _of->samples_tracked=0;
+ return ret;
+}
+
+/*Fetch and process a page.
+ This handles the case where we're at a bitstream boundary and dumps the
+ decoding machine.
+ If the decoding machine is unloaded, it loads it.
+ It also keeps prev_packet_gp up to date (seek and read both use this; seek
+ uses a special hack with _readp).
+ Return: <0) Error, OP_HOLE (lost packet), or OP_EOF.
+ 0) Need more data (only if _readp==0).
+ 1) Got at least one audio data packet.*/
+static int op_fetch_and_process_page(OggOpusFile *_of,int _readp,int _spanp){+ OggOpusLink *links;
+ ogg_uint32_t cur_serialno;
+ int seekable;
+ int cur_link;
+ int ret;
+ if(OP_LIKELY(_of->ready_state>=OP_INITSET)
+ &&OP_LIKELY(_of->op_pos<_of->op_count)){+ /*We're ready to decode and have at least one packet available already.*/
+ return 1;
+ }
+ if(!_readp)return 0;
+ seekable=_of->seekable;
+ links=_of->links;
+ cur_link=seekable?_of->cur_link:0;
+ cur_serialno=links[cur_link].serialno;
+ /*Handle one page.*/
+ for(;;){+ ogg_page og;
+ opus_int64 page_pos;
+ OP_ASSERT(_of->ready_state>=OP_OPENED);
+ /*This loop is not strictly necessary, but there's no sense in doing the
+ extra checks of the larger loop for the common case in a multiplexed
+ bistream where the page is simply part of a different logical
+ bitstream.*/
+ do{+ /*Keep reading until we get a page with the correct serialno.*/
+ page_pos=op_get_next_page(_of,&og,-1);
+ /*EOF: Leave uninitialized.*/
+ if(page_pos<0)return OP_EOF;
+ if(OP_LIKELY(_of->ready_state>=OP_STREAMSET)){+ if(cur_serialno!=(ogg_uint32_t)ogg_page_serialno(&og)){+ /*Two possibilities:
+ 1) Another stream is multiplexed into this logical section, or*/
+ if(OP_LIKELY(!ogg_page_bos(&og)))continue;
+ /* 2) Our decoding just traversed a bitstream boundary.*/
+ if(!_spanp)return OP_EOF;
+ if(OP_LIKELY(_of->ready_state>=OP_INITSET))op_decode_clear(_of);
+ break;
+ }
+ }
+ /*Bitrate tracking: add the header's bytes here.
+ The body bytes are counted when we consume the packets.*/
+ _of->bytes_tracked+=og.header_len;
+ }
+ while(0);
+ /*Do we need to load a new machine before submitting the page?
+ This is different in the seekable and non-seekable cases.
+ In the seekable case, we already have all the header information loaded
+ and cached.
+ We just initialize the machine with it and continue on our merry way.
+ In the non-seekable (streaming) case, we'll only be at a boundary if we
+ just left the previous logical bitstream, and we're now nominally at the
+ header of the next bitstream.*/
+ if(OP_UNLIKELY(_of->ready_state<OP_STREAMSET)){+ if(seekable){+ ogg_uint32_t serialno;
+ int nlinks;
+ int li;
+ serialno=ogg_page_serialno(&og);
+ /*Match the serialno to bitstream section.
+ We use this rather than offset positions to avoid problems near
+ logical bitstream boundaries.*/
+ nlinks=_of->nlinks;
+ for(li=0;li<nlinks&&links[li].serialno!=serialno;li++);
+ /*Not a desired Opus bitstream section.
+ Keep trying.*/
+ if(li>=nlinks)continue;
+ cur_serialno=serialno;
+ _of->cur_link=cur_link=li;
+ ogg_stream_reset_serialno(&_of->os,serialno);
+ _of->ready_state=OP_STREAMSET;
+ /*If we're at the start of this link, initialize the granule position
+ and pre-skip tracking.*/
+ if(page_pos<=links[cur_link].data_offset){+ _of->prev_packet_gp=links[cur_link].pcm_start;
+ _of->cur_discard_count=links[cur_link].head.pre_skip;
+ }
+ }
+ else{+ do{+ /*We're streaming.
+ Fetch the two header packets, build the info struct.*/
+ ret=op_fetch_headers(_of,&links[0].head,&links[0].tags,
+ NULL,NULL,NULL,&og);
+ if(OP_UNLIKELY(ret<0))return ret;
+ ret=op_find_initial_pcm_offset(_of,links,&og);
+ if(OP_UNLIKELY(ret<0))return ret;
+ _of->links[0].serialno=cur_serialno=_of->os.serialno;
+ _of->cur_link++;
+ }
+ /*If the link was empty, keep going, because we already have the
+ BOS page of the next one in og.*/
+ while(OP_UNLIKELY(ret>0));
+ /*If we didn't get any packets out of op_find_initial_pcm_offset(),
+ keep going (this is possible if end-trimming trimmed them all).*/
+ if(_of->op_count<=0)continue;
+ /*Otherwise, we're done.*/
+ ret=op_make_decode_ready(_of);
+ if(OP_UNLIKELY(ret<0))return ret;
+ return 1;
+ }
+ }
+ /*The buffered page is the data we want, and we're ready for it.
+ Add it to the stream state.*/
+ if(OP_UNLIKELY(_of->ready_state==OP_STREAMSET)){+ ret=op_make_decode_ready(_of);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ /*Extract all the packets from the current page.*/
+ ogg_stream_pagein(&_of->os,&og);
+ if(OP_LIKELY(_of->ready_state>=OP_INITSET)){+ opus_int32 total_duration;
+ int durations[255];
+ int op_count;
+ total_duration=op_collect_audio_packets(_of,durations);
+ /*Report holes to the caller.*/
+ if(OP_UNLIKELY(total_duration<0))return (int)total_duration;
+ op_count=_of->op_count;
+ /*If we found at least one audio data packet, compute per-packet granule
+ positions for them.*/
+ if(op_count>0){+ ogg_int64_t diff;
+ ogg_int64_t prev_packet_gp;
+ ogg_int64_t cur_packet_gp;
+ ogg_int64_t cur_page_gp;
+ int cur_page_eos;
+ int pi;
+ cur_page_gp=_of->op[op_count-1].granulepos;
+ cur_page_eos=_of->op[op_count-1].e_o_s;
+ prev_packet_gp=_of->prev_packet_gp;
+ if(OP_UNLIKELY(prev_packet_gp==-1)){+ opus_int32 cur_discard_count;
+ /*This is the first call after a raw seek.
+ Try to reconstruct prev_packet_gp from scratch.*/
+ OP_ASSERT(seekable);
+ if(OP_UNLIKELY(cur_page_eos)){+ /*If the first page we hit after our seek was the EOS page, and
+ we didn't start from data_offset or before, we don't have
+ enough information to do end-trimming.
+ Proceed to the next link, rather than risk playing back some
+ samples that shouldn't have been played.*/
+ _of->op_count=0;
+ continue;
+ }
+ /*By default discard 80 ms of data after a seek, unless we seek
+ into the pre-skip region.*/
+ cur_discard_count=80*48;
+ cur_page_gp=_of->op[op_count-1].granulepos;
+ /*Try to initialize prev_packet_gp.
+ If the current page had packets but didn't have a granule
+ position, or the granule position it had was too small (both
+ illegal), just use the starting granule position for the link.*/
+ prev_packet_gp=links[cur_link].pcm_start;
+ if(OP_LIKELY(cur_page_gp!=-1)){+ op_granpos_add(&prev_packet_gp,cur_page_gp,-total_duration);
+ }
+ if(OP_LIKELY(!op_granpos_diff(&diff,
+ prev_packet_gp,links[cur_link].pcm_start))){+ opus_int32 pre_skip;
+ /*If we start at the beginning of the pre-skip region, or we're
+ at least 80 ms from the end of the pre-skip region, we discard
+ to the end of the pre-skip region.
+ Otherwise, we still use the 80 ms default, which will discard
+ past the end of the pre-skip region.*/
+ pre_skip=links[cur_link].head.pre_skip;
+ if(diff>=0&&diff<=OP_MAX(0,pre_skip-80*48)){+ cur_discard_count=pre_skip-(int)diff;
+ }
+ }
+ _of->cur_discard_count=cur_discard_count;
+ }
+ if(OP_UNLIKELY(cur_page_gp==-1)){+ /*This page had completed packets but didn't have a valid granule
+ position.
+ This is illegal, but we'll try to handle it by continuing to count
+ forwards from the previous page.*/
+ if(op_granpos_add(&cur_page_gp,prev_packet_gp,total_duration)<0){+ /*The timestamp for this page overflowed.*/
+ cur_page_gp=links[cur_link].pcm_end;
+ }
+ }
+ /*If we hit the last page, handle end-trimming.*/
+ if(OP_UNLIKELY(cur_page_eos)
+ &&OP_LIKELY(!op_granpos_diff(&diff,cur_page_gp,prev_packet_gp))
+ &&OP_LIKELY(diff<total_duration)){+ cur_packet_gp=prev_packet_gp;
+ for(pi=0;pi<op_count;pi++){+ diff=durations[pi]-diff;
+ /*If we have samples to trim...*/
+ if(diff>0){+ /*If we trimmed the entire packet, stop (the spec says encoders
+ shouldn't do this, but we support it anyway).*/
+ if(OP_UNLIKELY(diff>durations[pi]))break;
+ cur_packet_gp=cur_page_gp;
+ /*Move the EOS flag to this packet, if necessary, so we'll trim
+ the samples during decode.*/
+ _of->op[pi].e_o_s=1;
+ }
+ else{+ /*Update the granule position as normal.*/
+ ret=op_granpos_add(&cur_packet_gp,cur_packet_gp,durations[pi]);
+ OP_ASSERT(!ret);
+ }
+ _of->op[pi].granulepos=cur_packet_gp;
+ ret=op_granpos_diff(&diff,cur_page_gp,cur_packet_gp);
+ OP_ASSERT(!ret);
+ }
+ }
+ else{+ /*Propagate timestamps to earlier packets.
+ op_granpos_add(&prev_packet_gp,prev_packet_gp,total_duration)
+ should succeed and give prev_packet_gp==cur_page_gp.
+ But we don't bother to check that, as there isn't much we can do
+ if it's not true.
+ The only thing we guarantee is that the start and end granule
+ positions of the packets are valid, and that they are monotonic
+ within a page.
+ They might be completely out of range for this link (we'll check
+ that elsewhere), or non-monotonic between pages.*/
+ if(OP_UNLIKELY(op_granpos_add(&prev_packet_gp,
+ cur_page_gp,-total_duration)<0)){+ /*The starting timestamp for the first packet on this page
+ underflowed.
+ This is illegal, but we ignore it.*/
+ prev_packet_gp=0;
+ }
+ for(pi=0;pi<op_count;pi++){+ if(OP_UNLIKELY(op_granpos_add(&cur_packet_gp,
+ cur_page_gp,-total_duration)<0)){+ /*The start timestamp for this packet underflowed.
+ This is illegal, but we ignore it.*/
+ cur_packet_gp=0;
+ }
+ total_duration-=durations[pi];
+ OP_ASSERT(total_duration>=0);
+ ret=op_granpos_add(&cur_packet_gp,cur_packet_gp,durations[pi]);
+ OP_ASSERT(!ret);
+ _of->op[pi].granulepos=cur_packet_gp;
+ }
+ OP_ASSERT(total_duration==0);
+ }
+ _of->prev_packet_gp=prev_packet_gp;
+ _of->op_count=pi;
+ /*If end-trimming didn't trim all the packets, we're done.*/
+ if(OP_LIKELY(pi>0))return 1;
+ }
+ }
+ }
+}
+
+int op_raw_seek(OggOpusFile *_of,opus_int64 _pos){+ OggOpusLink *links;
+ int nlinks;
+ int cur_link;
+ int ret;
+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED))return OP_EINVAL;
+ /*Don't dump the decoder state if we can't seek.*/
+ if(OP_UNLIKELY(!_of->seekable))return OP_ENOSEEK;
+ if(OP_UNLIKELY(_pos<0)||OP_UNLIKELY(_pos>_of->end))return OP_EINVAL;
+ links=_of->links;
+ nlinks=_of->nlinks;
+ cur_link=_of->cur_link;
+ /*Clear out any buffered, decoded data.*/
+ op_decode_clear(_of);
+ _of->bytes_tracked=0;
+ _of->samples_tracked=0;
+ ret=op_seek_helper(_of,_pos);
+ if(OP_UNLIKELY(ret<0))return OP_EREAD;
+ do ret=op_fetch_and_process_page(_of,1,1);
+ /*Ignore holes.*/
+ while(ret==OP_HOLE);
+ /*If we hit EOF, op_fetch_and_process_page() leaves us uninitialized.
+ Instead, jump to the end.*/
+ if(ret==OP_EOF){+ cur_link=nlinks-1;
+ op_decode_clear(_of);
+ _of->cur_link=cur_link;
+ _of->prev_packet_gp=links[cur_link].pcm_end;
+ _of->cur_discard_count=0;
+ ret=0;
+ }
+ else if(ret>0)ret=0;
+ return ret;
+}
+
+/*Convert a PCM offset relative to the start of the whole stream to a granule
+ position in an individual link.*/
+static ogg_int64_t op_get_granulepos(const OggOpusFile *_of,
+ ogg_int64_t _pcm_offset,int *_li){+ OggOpusLink *links;
+ ogg_int64_t duration;
+ int nlinks;
+ int li;
+ int ret;
+ OP_ASSERT(_pcm_offset>=0);
+ nlinks=_of->nlinks;
+ links=_of->links;
+ for(li=0;OP_LIKELY(li<nlinks);li++){+ ogg_int64_t pcm_start;
+ opus_int32 pre_skip;
+ pcm_start=links[li].pcm_start;
+ pre_skip=links[li].head.pre_skip;
+ ret=op_granpos_diff(&duration,links[li].pcm_end,pcm_start);
+ OP_ASSERT(!ret);
+ duration-=pre_skip;
+ if(_pcm_offset<duration){+ _pcm_offset+=pre_skip;
+ if(OP_UNLIKELY(pcm_start>OP_INT64_MAX-_pcm_offset)){+ /*Adding this amount to the granule position would overflow the positive
+ half of its 64-bit range.
+ Since signed overflow is undefined in C, do it in a way the compiler
+ isn't allowed to screw up.*/
+ _pcm_offset-=OP_INT64_MAX-pcm_start+1;
+ pcm_start=OP_INT64_MIN;
+ }
+ pcm_start+=_pcm_offset;
+ *_li=li;
+ return pcm_start;
+ }
+ _pcm_offset-=duration;
+ }
+ return -1;
+}
+
+/*Rescale the number _x from the range [0,_from] to [0,_to].
+ _from and _to must be positive.*/
+opus_int64 op_rescale64(opus_int64 _x,opus_int64 _from,opus_int64 _to){+ opus_int64 frac;
+ opus_int64 ret;
+ int i;
+ if(_x>=_from)return _to;
+ if(_x<=0)return 0;
+ frac=0;
+ for(i=0;i<63;i++){+ frac<<=1;
+ OP_ASSERT(_x<=_from);
+ if(_x>=_from>>1){+ _x-=_from-_x;
+ frac|=1;
+ }
+ else _x<<=1;
+ }
+ ret=0;
+ for(i=0;i<63;i++){+ if(frac&1)ret=(ret&_to&1)+(ret>>1)+(_to>>1);
+ else ret>>=1;
+ frac>>=1;
+ }
+ return ret;
+}
+
+/*Search within link _li for the page with the highest granule position
+ preceding (or equal to) _target_gp.
+ There is a danger here: missing pages or incorrect frame number information
+ in the bitstream could make our task impossible.
+ Account for that (it would be an error condition).*/
+static int op_pcm_seek_page_impl(OggOpusFile *_of,
+ ogg_int64_t _target_gp,int _li){+ OggOpusLink *link;
+ ogg_page og;
+ ogg_int64_t pcm_pre_skip;
+ ogg_int64_t pcm_start;
+ ogg_int64_t pcm_end;
+ ogg_int64_t best_gp;
+ ogg_int64_t diff;
+ ogg_uint32_t serialno;
+ opus_int32 pre_skip;
+ opus_int32 cur_discard_count;
+ opus_int64 begin;
+ opus_int64 end;
+ opus_int64 best;
+ opus_int64 llret;
+ int ret;
+ _of->bytes_tracked=0;
+ _of->samples_tracked=0;
+ op_decode_clear(_of);
+ /*New search algorithm by HB (Nicholas Vinen).*/
+ link=_of->links+_li;
+ best_gp=pcm_start=link->pcm_start;
+ pcm_end=link->pcm_end;
+ serialno=link->serialno;
+ best=begin=link->data_offset;
+ /*We discard the first 80 ms of data after a seek, so seek back that much
+ farther.
+ If we can't, simply seek to the beginning of the link.*/
+ if(OP_UNLIKELY(op_granpos_add(&_target_gp,_target_gp,-80*48)<0)){+ _target_gp=pcm_start;
+ }
+ /*Special case seeking to the start of the link.*/
+ pre_skip=link->head.pre_skip;
+ ret=op_granpos_add(&pcm_pre_skip,pcm_start,pre_skip);
+ OP_ASSERT(!ret);
+ end=op_granpos_cmp(_target_gp,pcm_pre_skip)<0?begin:link->end_offset;
+ llret=OP_FALSE;
+ while(begin<end){+ opus_int64 bisect;
+ if(end-begin<OP_CHUNK_SIZE)bisect=begin;
+ else{+ ogg_int64_t diff2;
+ ret=op_granpos_diff(&diff,_target_gp,pcm_start);
+ OP_ASSERT(!ret);
+ ret=op_granpos_diff(&diff2,pcm_end,pcm_start);
+ OP_ASSERT(!ret);
+ /*Take a (pretty decent) guess.*/
+ bisect=begin+op_rescale64(diff,diff2,end-begin)-OP_CHUNK_SIZE;
+ if(bisect<begin+OP_CHUNK_SIZE)bisect=begin;
+ }
+ if(bisect!=_of->offset){+ ret=op_seek_helper(_of,bisect);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ while(begin<end){+ llret=op_get_next_page(_of,&og,end-_of->offset);
+ if(llret==OP_EREAD)return OP_EBADLINK;
+ if(llret<0){+ /*Found it.*/
+ if(bisect<=begin+1)end=begin;
+ else{+ bisect=OP_MAX(bisect-OP_CHUNK_SIZE,begin+1);
+ ret=op_seek_helper(_of,bisect);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ }
+ else{+ ogg_int64_t gp;
+ if(serialno!=(ogg_uint32_t)ogg_page_serialno(&og))continue;
+ gp=ogg_page_granulepos(&og);
+ if(gp==-1)continue;
+ if(op_granpos_cmp(gp,_target_gp)<0){+ /*Advance to the raw offset of the next page.*/
+ begin=_of->offset;
+ /*Don't let pcm_start get smaller!
+ That could happen with an invalid timestamp.*/
+ if(op_granpos_cmp(pcm_start,gp)<=0){+ /*Save the byte offset of the end of the page with this granule
+ position.*/
+ best=_of->offset;
+ best_gp=pcm_start=gp;
+ }
+ if(OP_UNLIKELY(op_granpos_diff(&diff,_target_gp,pcm_start)<0)
+ ||diff>48000){+ break;
+ }
+ /*NOT begin+1.*/
+ bisect=begin;
+ }
+ else{+ /*Found it.*/
+ if(bisect<=begin+1)end=begin;
+ else{+ /*We're pretty close.
+ We'd be stuck in an endless loop otherwise.*/
+ if(end==_of->offset){+ end=llret;
+ bisect=OP_MAX(bisect-OP_CHUNK_SIZE,begin+1);
+ ret=op_seek_helper(_of,bisect);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ else{+ end=bisect;
+ /*Don't let pcm_end get larger!
+ That could happen with an invalid timestamp.*/
+ if(OP_LIKELY(op_granpos_cmp(pcm_end,gp)>0))pcm_end=gp;
+ break;
+ }
+ }
+ }
+ }
+ }
+ }
+ /*Found our page.
+ Seek right after it and update prev_packet_gp and cur_discard_count.
+ This is an easier case than op_raw_seek(), as we don't need to keep any
+ packets from the page we found.*/
+ /*Seek, if necessary.*/
+ if(best!=_of->offset){+ ret=op_seek_helper(_of,best);
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+ /*By default, discard 80 ms of data after a seek, unless we seek
+ into the pre-skip region.*/
+ cur_discard_count=80*48;
+ ret=op_granpos_diff(&diff,best_gp,pcm_start);
+ OP_ASSERT(!ret);
+ OP_ASSERT(diff>=0);
+ /*If we start at the beginning of the pre-skip region, or we're at least
+ 80 ms from the end of the pre-skip region, we discard to the end of the
+ pre-skip region.
+ Otherwise, we still use the 80 ms default, which will discard past the end
+ of the pre-skip region.*/
+ if(diff<=OP_MAX(0,pre_skip-80*48))cur_discard_count=pre_skip-(int)diff;
+ _of->cur_link=_li;
+ _of->ready_state=OP_STREAMSET;
+ _of->prev_packet_gp=best_gp;
+ _of->cur_discard_count=cur_discard_count;
+ ogg_stream_reset_serialno(&_of->os,serialno);
+ do ret=op_fetch_and_process_page(_of,1,0);
+ /*Ignore holes.*/
+ while(ret==OP_HOLE);
+ if(OP_UNLIKELY(ret<=0))return OP_EBADLINK;
+ /*Verify result.*/
+ if(OP_UNLIKELY(op_granpos_cmp(_of->prev_packet_gp,_target_gp)>0)){+ return OP_EBADLINK;
+ }
+ return 0;
+}
+
+int op_pcm_seek_page(OggOpusFile *_of,ogg_int64_t _pcm_offset){+ ogg_int64_t target_gp;
+ int li;
+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED))return OP_EINVAL;
+ if(OP_UNLIKELY(!_of->seekable))return OP_ENOSEEK;
+ if(OP_UNLIKELY(_pcm_offset<0))return OP_EINVAL;
+ target_gp=op_get_granulepos(_of,_pcm_offset,&li);
+ if(OP_UNLIKELY(target_gp==-1))return OP_EINVAL;
+ return op_pcm_seek_page_impl(_of,target_gp,li);
+}
+
+int op_pcm_seek(OggOpusFile *_of,ogg_int64_t _pcm_offset){+ OggOpusLink *link;
+ ogg_int64_t pcm_start;
+ ogg_int64_t target_gp;
+ ogg_int64_t prev_packet_gp;
+ ogg_int64_t skip;
+ ogg_int64_t diff;
+ int op_count;
+ int op_pos;
+ int ret;
+ int li;
+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED))return OP_EINVAL;
+ if(OP_UNLIKELY(!_of->seekable))return OP_ENOSEEK;
+ if(OP_UNLIKELY(_pcm_offset<0))return OP_EINVAL;
+ target_gp=op_get_granulepos(_of,_pcm_offset,&li);
+ if(OP_UNLIKELY(target_gp==-1))return OP_EINVAL;
+ ret=op_pcm_seek_page_impl(_of,target_gp,li);
+ /*Now skip samples until we actually get to our target.*/
+ link=_of->links+li;
+ pcm_start=link->pcm_start;
+ ret=op_granpos_diff(&_pcm_offset,target_gp,pcm_start);
+ OP_ASSERT(!ret);
+ /*Figure out where we should skip to.*/
+ if(_pcm_offset<=link->head.pre_skip)skip=0;
+ else skip=OP_MAX(_pcm_offset-80*48,0);
+ OP_ASSERT(_pcm_offset-skip>=0);
+ OP_ASSERT(_pcm_offset-skip<0x7FFFFFFF-120*48);
+ /*Skip packets until we find one with samples past our skip target.*/
+ for(;;){+ op_count=_of->op_count;
+ prev_packet_gp=_of->prev_packet_gp;
+ for(op_pos=_of->op_pos;op_pos<op_count;op_pos++){+ ogg_int64_t cur_packet_gp;
+ cur_packet_gp=_of->op[op_pos].granulepos;
+ if(OP_LIKELY(!op_granpos_diff(&diff,cur_packet_gp,pcm_start))
+ &&diff>skip){+ break;
+ }
+ prev_packet_gp=cur_packet_gp;
+ }
+ _of->prev_packet_gp=prev_packet_gp;
+ _of->op_pos=op_pos;
+ if(op_pos<op_count)break;
+ /*We skipped all the packets on this page.
+ Fetch another.*/
+ do ret=op_fetch_and_process_page(_of,1,0);
+ /*Ignore holes.*/
+ while(ret==OP_HOLE);
+ if(OP_UNLIKELY(ret<=0))return OP_EBADLINK;
+ }
+ ret=op_granpos_diff(&diff,prev_packet_gp,pcm_start);
+ OP_ASSERT(!ret);
+ /*We skipped too far.
+ Either the timestamps were illegal or there was a hole in the data.*/
+ if(diff>skip)return OP_EBADLINK;
+ OP_ASSERT(_pcm_offset-diff<0x7FFFFFFF);
+ /*TODO: If there are further holes/illegal timestamps, we still won't decode
+ to the correct sample.
+ However, at least op_pcm_tell() will report the correct value immediately
+ after returning.*/
+ _of->cur_discard_count=(opus_int32)(_pcm_offset-diff);
+ return 0;
+}
+
+opus_int64 op_raw_tell(OggOpusFile *_of){+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED))return OP_EINVAL;
+ return _of->offset;
+}
+
+/*Convert a granule position from a given link to a PCM offset relative to the
+ start of the whole stream.
+ For unseekable sources, this gets reset to 0 at the beginning of each link.*/
+static ogg_int64_t op_get_pcm_offset(const OggOpusFile *_of,
+ ogg_int64_t _gp,int _li){+ OggOpusLink *links;
+ ogg_int64_t pcm_offset;
+ ogg_int64_t delta;
+ int li;
+ links=_of->links;
+ pcm_offset=0;
+ OP_ASSERT(_li<_of->nlinks);
+ for(li=0;li<_li;li++){+ op_granpos_diff(&delta,links[li].pcm_end,links[li].pcm_start);
+ delta-=links[li].head.pre_skip;
+ pcm_offset+=delta;
+ }
+ OP_ASSERT(_li>=0);
+ if(_of->seekable&&OP_UNLIKELY(op_granpos_cmp(_gp,links[_li].pcm_end)>0)){+ _gp=links[_li].pcm_end;
+ }
+ if(OP_LIKELY(op_granpos_cmp(_gp,links[_li].pcm_start)>0)){+ op_granpos_diff(&delta,_gp,links[_li].pcm_start);
+ if(delta<links[_li].head.pre_skip)delta=0;
+ else delta-=links[_li].head.pre_skip;
+ pcm_offset+=delta;
+ }
+ return pcm_offset;
+}
+
+ogg_int64_t op_pcm_tell(OggOpusFile *_of){+ ogg_int64_t gp;
+ int nbuffered;
+ int ret;
+ int li;
+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED))return OP_EINVAL;
+ gp=_of->prev_packet_gp;
+ if(gp==-1)return 0;
+ nbuffered=OP_MAX(_of->od_buffer_size-_of->od_buffer_pos,0);
+ ret=op_granpos_add(&gp,gp,-nbuffered);
+ OP_ASSERT(!ret);
+ li=_of->seekable?_of->cur_link:0;
+ if(op_granpos_add(&gp,gp,_of->cur_discard_count)<0){+ gp=_of->links[li].pcm_end;
+ }
+ return op_get_pcm_offset(_of,gp,li);
+}
+
+/*Allocate the decoder scratch buffer.
+ This is done lazily, since if the user provides large enough buffers, we'll
+ never need it.*/
+static int op_init_buffer(OggOpusFile *_of){+ int nchannels_max;
+ if(_of->seekable){+ OggOpusLink *links;
+ int nlinks;
+ int li;
+ links=_of->links;
+ nlinks=_of->nlinks;
+ nchannels_max=0;
+ for(li=0;li<nlinks;li++){+ nchannels_max=OP_MAX(nchannels_max,links[li].head.channel_count);
+ }
+ }
+ else nchannels_max=OP_NCHANNELS_MAX;
+ _of->od_buffer=(op_sample *)_ogg_malloc(
+ sizeof(*_of->od_buffer)*nchannels_max*120*48);
+ if(_of->od_buffer==NULL)return OP_EFAULT;
+ return 0;
+}
+
+/*Read more samples from the stream, using the same API as op_read() or
+ op_read_float().*/
+static int op_read_native(OggOpusFile *_of,
+ op_sample *_pcm,int _buf_size,int *_li){+ if(OP_UNLIKELY(_of->ready_state<OP_OPENED))return OP_EINVAL;
+ for(;;){+ int ret;
+ if(OP_LIKELY(_of->ready_state>=OP_INITSET)){+ int nchannels;
+ int od_buffer_pos;
+ int nsamples;
+ int op_pos;
+ nchannels=_of->links[_of->seekable?_of->cur_link:0].head.channel_count;
+ od_buffer_pos=_of->od_buffer_pos;
+ nsamples=_of->od_buffer_size-od_buffer_pos;
+ /*If we have buffered samples, return them.*/
+ if(OP_UNLIKELY(nsamples>0)){+ if(OP_UNLIKELY(nsamples*nchannels>_buf_size)){+ nsamples=_buf_size/nchannels;
+ }
+ memcpy(_pcm,_of->od_buffer+nchannels*od_buffer_pos,
+ sizeof(*_pcm)*nchannels*nsamples);
+ od_buffer_pos+=nsamples;
+ _of->od_buffer_pos=od_buffer_pos;
+ if(_li!=NULL)*_li=_of->cur_link;
+ return nsamples;
+ }
+ /*If we have buffered packets, decode one.*/
+ op_pos=_of->op_pos;
+ if(OP_LIKELY(op_pos<_of->op_count)){+ ogg_packet *pop;
+ ogg_int64_t diff;
+ opus_int32 cur_discard_count;
+ int duration;
+ int trimmed_duration;
+ pop=_of->op+op_pos++;
+ _of->op_pos=op_pos;
+ cur_discard_count=_of->cur_discard_count;
+ duration=op_get_packet_duration(pop->packet,pop->bytes);
+ /*We don't buffer packets with an invalid TOC sequence.*/
+ OP_ASSERT(duration>0);
+ trimmed_duration=duration;
+ /*Perform end-trimming.*/
+ if(OP_UNLIKELY(pop->e_o_s)){+ if(OP_UNLIKELY(op_granpos_cmp(pop->granulepos,
+ _of->prev_packet_gp)<=0)){+ trimmed_duration=0;
+ }
+ else if(OP_LIKELY(!op_granpos_diff(&diff,
+ pop->granulepos,_of->prev_packet_gp))){+ trimmed_duration=(int)OP_MIN(diff,trimmed_duration);
+ }
+ }
+ _of->prev_packet_gp=pop->granulepos;
+ if(OP_UNLIKELY(duration*nchannels>_buf_size)){+ op_sample *buf;
+ /*If the user's buffer is too small, decode into a scratch buffer.*/
+ buf=_of->od_buffer;
+ if(OP_UNLIKELY(buf==NULL)){+ ret=op_init_buffer(_of);
+ if(OP_UNLIKELY(ret<0))return ret;
+ buf=_of->od_buffer;
+ }
+#if defined(OP_FIXED_POINT)
+ ret=opus_multistream_decode(_of->od,
+ pop->packet,pop->bytes,buf,120*48,0);
+#else
+ ret=opus_multistream_decode_float(_of->od,
+ pop->packet,pop->bytes,buf,120*48,0);
+#endif
+ if(OP_UNLIKELY(ret<0))return OP_EBADPACKET;
+ OP_ASSERT(ret==duration);
+ /*Perform pre-skip/pre-roll.*/
+ od_buffer_pos=(int)OP_MIN(trimmed_duration,cur_discard_count);
+ cur_discard_count-=od_buffer_pos;
+ _of->cur_discard_count=cur_discard_count;
+ _of->od_buffer_pos=od_buffer_pos;
+ _of->od_buffer_size=trimmed_duration;
+ /*Update bitrate tracking based on the actual samples we used from
+ what was decoded.*/
+ _of->bytes_tracked+=pop->bytes;
+ _of->samples_tracked+=trimmed_duration-od_buffer_pos;
+ /*Don't grab another page yet.*/
+ if(OP_LIKELY(od_buffer_pos<trimmed_duration))continue;
+ }
+ else{+ /*Otherwise decode directly into the user's buffer.*/
+#if defined(OP_FIXED_POINT)
+ ret=opus_multistream_decode(_of->od,pop->packet,pop->bytes,
+ _pcm,_buf_size/nchannels,0);
+#else
+ ret=opus_multistream_decode_float(_of->od,pop->packet,pop->bytes,
+ _pcm,_buf_size/nchannels,0);
+#endif
+ if(OP_UNLIKELY(ret<0))return OP_EBADPACKET;
+ OP_ASSERT(ret==duration);
+ if(OP_LIKELY(trimmed_duration>0)){+ /*Perform pre-skip/pre-roll.*/
+ od_buffer_pos=(int)OP_MIN(trimmed_duration,cur_discard_count);
+ cur_discard_count-=od_buffer_pos;
+ _of->cur_discard_count=cur_discard_count;
+ if(OP_UNLIKELY(od_buffer_pos>0)
+ &&OP_LIKELY(od_buffer_pos<trimmed_duration)){+ memmove(_pcm,_pcm+od_buffer_pos*nchannels,
+ sizeof(*_pcm)*(trimmed_duration-od_buffer_pos)*nchannels);
+ }
+ trimmed_duration-=od_buffer_pos;
+ /*Update bitrate tracking based on the actual samples we used from
+ what was decoded.*/
+ _of->bytes_tracked+=pop->bytes;
+ _of->samples_tracked+=trimmed_duration;
+ if(OP_LIKELY(trimmed_duration>0)){+ if(_li!=NULL)*_li=_of->cur_link;
+ return trimmed_duration;
+ }
+ }
+ }
+ }
+ }
+ /*Suck in another page.*/
+ ret=op_fetch_and_process_page(_of,1,1);
+ if(OP_UNLIKELY(ret==OP_EOF)){+ if(_li!=NULL)*_li=_of->cur_link;
+ return 0;
+ }
+ if(OP_UNLIKELY(ret<0))return ret;
+ }
+}
+
+#if defined(OP_FIXED_POINT)
+
+int op_read(OggOpusFile *_of,opus_int16 *_pcm,int _buf_size,int *_li){+ return op_read_native(_of,_pcm,_buf_size,_li);
+}
+
+# if !defined(OP_DISABLE_FLOAT_API)
+int op_read_float(OggOpusFile *_of,float *_pcm,int _buf_size,int *_li){+ int ret;
+ /*Ensure we have some decoded samples in our buffer.*/
+ ret=op_read_native(_of,NULL,0,_li);
+ /*Now convert them to float.*/
+ if(OP_LIKELY(ret>=0)&&OP_LIKELY(_of->ready_state>=OP_INITSET)){+ int nchannels;
+ int od_buffer_pos;
+ nchannels=_of->links[_of->seekable?_of->cur_link:0].head.channel_count;
+ od_buffer_pos=_of->od_buffer_pos;
+ ret=_of->od_buffer_size-od_buffer_pos;
+ if(OP_LIKELY(ret>0)){+ op_sample *buf;
+ int i;
+ if(OP_UNLIKELY(ret*nchannels>_buf_size))ret=_buf_size/nchannels;
+ buf=_of->od_buffer+nchannels*od_buffer_pos;
+ _buf_size=ret*nchannels;
+ for(i=0;i<_buf_size;i++)_pcm[i]=(1.0F/32768)*buf[i];
+ od_buffer_pos+=ret;
+ _of->od_buffer_pos=od_buffer_pos;
+ }
+ }
+ return ret;
+}
+# endif
+
+#else
+
+# if defined(OP_HAVE_LRINTF)
+# include <math.h>
+# define op_float2int(_x) (lrintf(_x))
+# else
+# define op_float2int(_x) ((int)((_x)+((_x)<0?-0.5F:0.5F)))
+# endif
+
+/*The dithering code here is adapted from opusdec, part of opus-tools.
+ It was originally written by Greg Maxwell.*/
+
+static opus_uint32 op_rand(opus_uint32 _seed){+ return _seed*96314165+907633515&0xFFFFFFFFU;
+}
+
+/*This implements 16-bit quantization with full triangular dither and IIR noise
+ shaping.
+ The noise shaping filters were designed by Sebastian Gesemann, and are based
+ on the LAME ATH curves with flattening to limite their peak gain to 20 dB.
+ Everyone else's noise shaping filters are mildly crazy.
+ The 48 kHz version of this filter is just a warped version of the 44.1 kHz
+ filter and probably could be improved by shifting the HF shelf up in
+ frequency a little bit, since 48 kHz has a bit more room and being more
+ conservative against bat-ears is probably more important than more noise
+ suppression.
+ This process can increase the peak level of the signal (in theory by the peak
+ error of 1.5 +20 dB, though that is unobservably rare).
+ To avoid clipping, the signal is attenuated by a couple thousands of a dB.
+ Initially, the approach taken here was to only attenuate by the 99.9th
+ percentile, making clipping rare but not impossible (like SoX), but the
+ limited gain of the filter means that the worst case was only two
+ thousandths of a dB more, so this just uses the worst case.
+ The attenuation is probably also helpful to prevent clipping in the DAC
+ reconstruction filters or downstream resampling, in any case.*/
+
+#define OP_GAIN (32753.0F)
+
+#define OP_PRNG_GAIN (1.0F/0xFFFFFFFF)
+
+/*48 kHz noise shaping filter, sd=2.34.*/
+
+static const float OP_FCOEF_B[4]={+ 2.2374F,-0.7339F,-0.1251F,-0.6033F
+};
+
+static const float OP_FCOEF_A[4]={+ 0.9030F,0.0116F,-0.5853F,-0.2571F
+};
+
+static void op_shaped_dither16(OggOpusFile *_of,opus_int16 *_dst,float *_src,
+ int _nsamples,int _nchannels){+ opus_uint32 seed;
+ int mute;
+ int i;
+ mute=_of->dither_mute;
+ seed=_of->dither_seed;
+ /*In order to avoid replacing digital silence with quiet dither noise, we
+ mute if the output has been silent for a while.*/
+ if(mute>64)memset(_of->dither_a,0,sizeof(*_of->dither_a)*4*_nchannels);
+ for(i=0;i<_nsamples;i++){+ int silent;
+ int ci;
+ silent=1;
+ for(ci=0;ci<_nchannels;ci++){+ float r;
+ float s;
+ float err;
+ int si;
+ int j;
+ s=_src[_nchannels*i+ci];
+ silent&=s==0;
+ s*=OP_GAIN;
+ err=0;
+ for(j=0;j<4;j++){+ err+=OP_FCOEF_B[j]*_of->dither_b[ci*4+j]
+ -OP_FCOEF_A[j]*_of->dither_a[ci*4+j];
+ }
+ for(j=3;j-->0;)_of->dither_a[ci*4+j+1]=_of->dither_a[ci*4+j];
+ for(j=3;j-->0;)_of->dither_b[ci*4+j+1]=_of->dither_b[ci*4+j];
+ _of->dither_a[ci*4]=err;
+ s-=err;
+ if(mute>16)r=0;
+ else{+ seed=op_rand(seed);
+ r=seed*OP_PRNG_GAIN;
+ seed=op_rand(seed);
+ r-=seed*OP_PRNG_GAIN;
+ }
+ /*Clamp in float out of paranoia that the input will be > 96 dBFS and
+ wrap if the integer is clamped.*/
+ si=op_float2int(OP_CLAMP(-32768,s+r,32767));
+ _dst[_nchannels*i+ci]=(opus_int16)si;
+ /*Including clipping in the noise shaping is generally disastrous: the
+ futile effort to restore the clipped energy results in more clipping.
+ However, small amounts---at the level which could normally be created
+ by dither and rounding---are harmless and can even reduce clipping
+ somewhat due to the clipping sometimes reducing the dither + rounding
+ error.*/
+ _of->dither_b[ci*4]=mute>16?0:OP_CLAMP(-1.5F,si-s,1.5F);
+ }
+ mute++;
+ if(!silent)mute=0;
+ }
+ _of->dither_mute=OP_MIN(mute,65);
+ _of->dither_seed=seed;
+}
+
+int op_read(OggOpusFile *_of,opus_int16 *_pcm,int _buf_size,int *_li){+ int ret;
+ /*Ensure we have some decoded samples in our buffer.*/
+ ret=op_read_native(_of,NULL,0,_li);
+ /*Now convert them to shorts.*/
+ if(OP_LIKELY(ret>=0)&&OP_LIKELY(_of->ready_state>=OP_INITSET)){+ int nchannels;
+ int od_buffer_pos;
+ nchannels=_of->links[_of->seekable?_of->cur_link:0].head.channel_count;
+ od_buffer_pos=_of->od_buffer_pos;
+ ret=_of->od_buffer_size-od_buffer_pos;
+ if(OP_LIKELY(ret>0)){+ op_sample *buf;
+ if(OP_UNLIKELY(ret*nchannels>_buf_size))ret=_buf_size/nchannels;
+ buf=_of->od_buffer+nchannels*od_buffer_pos;
+ op_shaped_dither16(_of,_pcm,buf,ret,nchannels);
+ od_buffer_pos+=ret;
+ _of->od_buffer_pos=od_buffer_pos;
+ }
+ }
+ return ret;
+}
+
+int op_read_float(OggOpusFile *_of,float *_pcm,int _buf_size,int *_li){+ return op_read_native(_of,_pcm,_buf_size,_li);
+}
+
+#endif
--- /dev/null
+++ b/src/stream.c
@@ -1,0 +1,174 @@
+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE libopusfile SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
+ * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: stdio-based convenience library for opening/seeking/decoding
+ last mod: $Id: vorbisfile.c 17573 2010-10-27 14:53:59Z xiphmont $
+
+ ********************************************************************/
+#include "internal.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+typedef struct OpusMemStream OpusMemStream;
+
+#define OP_MEM_SIZE_MAX (~(size_t)0>>1)
+#define OP_MEM_DIFF_MAX ((ptrdiff_t)OP_MEM_SIZE_MAX)
+
+/*The context information needed to read from a block of memory as if it were a
+ file.*/
+struct OpusMemStream{+ /*The block of memory to read from.*/
+ const unsigned char *data;
+ /*The total size of the block.
+ This must be at most OP_MEM_SIZE_MAX to prevent signed overflow while
+ seeking.*/
+ ptrdiff_t size;
+ /*The current file position.
+ This is allowed to be set arbitrarily greater than size (i.e., past the end
+ of the block, though we will not read data past the end of the block), but
+ is not allowed to be negative (i.e., before the beginning of the block).*/
+ ptrdiff_t pos;
+};
+
+static int op_fseek(void *_stream,opus_int64 _offset,int _whence){+#if defined(_MSC_VER)
+ return _fseeki64((FILE *)_stream,_offset,_whence);
+#else
+ return fseeko((FILE *)_stream,(off_t)_offset,_whence);
+#endif
+}
+
+static opus_int64 op_ftell(void *_stream){+#if defined(_MSC_VER)
+ return _ftelli64((FILE *)_stream);
+#else
+ return ftello((FILE *)_stream);
+#endif
+}
+
+static const OpusFileCallbacks OP_FILE_CALLBACKS={+ (op_read_func)fread,
+ op_fseek,
+ op_ftell,
+ (op_close_func)fclose
+};
+
+void *op_fopen(OpusFileCallbacks *_cb,const char *_path,const char *_mode){+ FILE *fp;
+ fp=fopen(_path,_mode);
+ if(fp!=NULL)*_cb=*&OP_FILE_CALLBACKS;
+ return fp;
+}
+
+void *op_fdopen(OpusFileCallbacks *_cb,int _fd,const char *_mode){+ FILE *fp;
+ fp=fdopen(_fd,_mode);
+ if(fp!=NULL)*_cb=*&OP_FILE_CALLBACKS;
+ return fp;
+}
+
+void *op_freopen(OpusFileCallbacks *_cb,const char *_path,const char *_mode,
+ void *_stream){+ FILE *fp;
+ fp=freopen(_path,_mode,(FILE *)_stream);
+ if(fp!=NULL)*_cb=*&OP_FILE_CALLBACKS;
+ return fp;
+}
+
+static size_t op_mem_read(void *_ptr,size_t _size,size_t _nmemb,void *_stream){+ OpusMemStream *stream;
+ size_t total;
+ ptrdiff_t size;
+ ptrdiff_t pos;
+ stream=(OpusMemStream *)_stream;
+ if(_size>OP_MEM_SIZE_MAX)return 0;
+ total=_size*_nmemb;
+ /*Check for overflow/empty read.*/
+ if(total==0||total/_size!=_nmemb)return 0;
+ size=stream->size;
+ pos=stream->pos;
+ /*Check for EOF.*/
+ if(pos>=size)return 0;
+ /*Check for a short read.*/
+ if(total>(size_t)(size-pos)){+ _nmemb=(size-pos)/_size;
+ total=_size*_nmemb;
+ }
+ memcpy(_ptr,stream->data,total);
+ pos+=total;
+ stream->pos=pos;
+ return _nmemb;
+}
+
+static int op_mem_seek(void *_stream,opus_int64 _offset,int _whence){+ OpusMemStream *stream;
+ ptrdiff_t pos;
+ stream=(OpusMemStream *)_stream;
+ pos=stream->pos;
+ switch(_whence){+ case SEEK_SET:{+ /*Check for overflow:*/
+ if(_offset<0||_offset>OP_MEM_DIFF_MAX)return -1;
+ pos=(ptrdiff_t)_offset;
+ }break;
+ case SEEK_CUR:{+ /*Check for overflow:*/
+ if(_offset<-pos||_offset>OP_MEM_DIFF_MAX-pos)return -1;
+ pos=(ptrdiff_t)(pos+_offset);
+ }break;
+ case SEEK_END:{+ ptrdiff_t size;
+ size=stream->size;
+ OP_ASSERT(size>=0);
+ /*Check for overflow:*/
+ if(_offset>size||_offset<size-OP_MEM_DIFF_MAX)return -1;
+ pos=(ptrdiff_t)(size-_offset);
+ }break;
+ default:return -1;
+ }
+ stream->pos=pos;
+ return 0;
+}
+
+static opus_int64 op_mem_tell(void *_stream){+ OpusMemStream *stream;
+ stream=(OpusMemStream *)_stream;
+ return (ogg_int64_t)stream->pos;
+}
+
+static int op_mem_close(void *_stream){+ _ogg_free(_stream);
+ return 0;
+}
+
+static const OpusFileCallbacks OP_MEM_CALLBACKS={+ op_mem_read,
+ op_mem_seek,
+ op_mem_tell,
+ op_mem_close
+};
+
+void *op_mem_stream_create(OpusFileCallbacks *_cb,
+ const unsigned char *_data,size_t _size){+ OpusMemStream *stream;
+ if(_size>OP_MEM_SIZE_MAX)return NULL;
+ stream=(OpusMemStream *)_ogg_malloc(sizeof(*stream));
+ if(stream!=NULL){+ *_cb=*&OP_MEM_CALLBACKS;
+ stream->data=_data;
+ stream->size=_size;
+ stream->pos=0;
+ }
+ return stream;
+}
--- /dev/null
+++ b/unix/Makefile
@@ -1,0 +1,182 @@
+# NOTE: This Makefile requires GNU make
+# Location to put the targets.
+TARGETBINDIR = .
+TESTBINDIR = tests
+TARGETLIBDIR = .
+# Name of the targets
+LIBOPUSFILE_TARGET = libopusfile.a
+OPUSFILE_EXAMPLE_TARGET = opusfile_example
+SEEKING_EXAMPLE_TARGET = seeking_example
+# Test targets
+#TODO: tests
+FOO_TARGET = foo
+# The command to use to generate dependency information
+MAKEDEPEND = ${CC} -MM+#MAKEDEPEND = makedepend -f- -Y --
+# The location of include files.
+# Modify these to point to your Ogg and Vorbis include directories if they are
+# not installed in a standard location.
+CINCLUDE = `pkg-config --cflags ogg opus`
+# These are gcc-only, but not actually critical.
+# Extra compilation flags.
+# You may get speed increases by including flags such as -O2 or -O3 or
+# -ffast-math, or additional flags, depending on your system and compiler.
+# The -g flag will generally include debugging information.
+CFLAGS := -g $(CFLAGS)
+CFLAGS := -DOP_ENABLE_ASSERTIONS $(CFLAGS)
+CFLAGS := -fPIC $(CFLAGS)
+CFLAGS := -std=c89 -pedantic $(CFLAGS)
+CFLAGS := -fvisibility=hidden $(CFLAGS)
+CFLAGS := -Wextra -Wno-parentheses -Wno-long-long $(CFLAGS)
+CFLAGS := -Wall $(CFLAGS)
+
+# Libraries to link with, and the location of library files.
+LIBS = `pkg-config --libs ogg opus`
+
+#TODO: tests
+SEEKING_EXAMPLE_LIBS = -lm
+
+# ANYTHING BELOW THIS LINE PROBABLY DOES NOT NEED EDITING
+CINCLUDE := -I../include ${CINCLUDE}+LIBSRCDIR = ../src
+BINSRCDIR = ../examples
+TESTSRCDIR = ${LIBSRCDIR}+WORKDIR = objs
+
+# C source file lists
+LIBOPUSFILE_CSOURCES = \
+info.c \
+internal.c \
+opusfile.c \
+stream.c \
+
+LIBOPUSFILE_CHEADERS = \
+internal.h \
+
+OPUSFILE_EXAMPLE_CSOURCES = opusfile_example.c
+
+SEEKING_EXAMPLE_CSOURCES = seeking_example.c
+
+FOO_CSOURCES = tests/foo.c
+
+# Create object file list.
+LIBOPUSFILE_OBJS:= ${LIBOPUSFILE_CSOURCES:%.c=${WORKDIR}/%.o}+LIBOPUSFILE_ASMS:= ${LIBOPUSFILE_OBJS:%.o=%.s}+LIBOPUSFILE_DEPS:= ${LIBOPUSFILE_OBJS:%.o=%.d}+OPUSFILE_EXAMPLE_OBJS:= ${OPUSFILE_EXAMPLE_CSOURCES:%.c=${WORKDIR}/%.o}+SEEKING_EXAMPLE_OBJS:= ${SEEKING_EXAMPLE_CSOURCES:%.c=${WORKDIR}/%.o}+#TODO: tests
+FOO_OBJS:= ${FOO_CSOURCES:%.c=${WORKDIR}/%.o}+ALL_OBJS:= \
+ ${LIBOPUSFILE_OBJS} \+ ${OPUSFILE_EXAMPLE_OBJS} \+ ${SEEKING_EXAMPLE_OBJS} \+
+#TODO: tests
+# ${FOO_OBJS}+
+# Create the dependency file list
+ALL_DEPS:= ${ALL_OBJS:%.o=%.d}+# Prepend source path to file names.
+LIBOPUSFILE_CSOURCES:= ${LIBOPUSFILE_CSOURCES:%=${LIBSRCDIR}/%}+LIBOPUSFILE_CHEADERS:= ${LIBOPUSFILE_CHEADERS:%=${LIBSRCDIR}/%}+OPUSFILE_EXAMPLE_CSOURCES:= ${OPUSFILE_EXAMPLE_CSOURCES:%=${BINSRCDIR}/%}+SEEKING_EXAMPLE_CSOURCES:= ${SEEKING_EXAMPLE_CSOURCES:%=${BINSRCDIR}/%}+#TODO: tests
+FOO_CSOURCES:= ${FOO_CSOURCES:%=${TESTSRCDIR}/%}+ALL_CSOURCES:= \
+ ${LIBOPUSFILE_CSOURCES} \+ ${OPUSFILE_EXAMPLE_CSOURCES} \+ ${SEEKING_EXAMPLE_CSOURCES} \+
+#TODO: tests
+# ${FOO_CSOURCES} \+# Prepand target path to file names.
+LIBOPUSFILE_TARGET:= ${TARGETLIBDIR}/${LIBOPUSFILE_TARGET}+OPUSFILE_EXAMPLE_TARGET:= ${TARGETBINDIR}/${OPUSFILE_EXAMPLE_TARGET}+SEEKING_EXAMPLE_TARGET:= ${TARGETBINDIR}/${SEEKING_EXAMPLE_TARGET}+# Prepend test path to file names.
+#TODO: tests
+FOO_TARGET:= ${TESTBINDIR}/${FOO_TARGET}+# Complete set of targets
+ALL_TARGETS:= \
+ ${LIBOPUSFILE_TARGET} \+ ${OPUSFILE_EXAMPLE_TARGET} \+ ${SEEKING_EXAMPLE_TARGET} \+
+#TODO: tests
+# ${FOO_TARGET} \+
+# Targets:
+# Everything (default)
+all: ${ALL_TARGETS}+
+# libopusfile
+${LIBOPUSFILE_TARGET}: ${LIBOPUSFILE_OBJS}+ mkdir -p ${TARGETLIBDIR}+ ar cqs $@ ${LIBOPUSFILE_OBJS}+
+# opusfile_example
+${OPUSFILE_EXAMPLE_TARGET}: ${OPUSFILE_EXAMPLE_OBJS} ${LIBOPUSFILE_TARGET}+ mkdir -p ${TARGETBINDIR}+ ${CC} ${CFLAGS} ${OPUSFILE_EXAMPLE_OBJS} ${LIBS} \+ ${SEEKING_EXAMPLE_LIBS} ${LIBOPUSFILE_TARGET} -o $@+
+# seeking_example
+${SEEKING_EXAMPLE_TARGET}: ${SEEKING_EXAMPLE_OBJS} ${LIBOPUSFILE_TARGET}+ mkdir -p ${TARGETBINDIR}+ ${CC} ${CFLAGS} ${SEEKING_EXAMPLE_OBJS} ${LIBS} ${LIBOPUSFILE_TARGET} \+ -o $@
+
+#TODO: tests
+# foo
+#${FOO_TARGET}: ${FOO_OBJS}+# mkdir -p ${TESTBINDIR}+# ${CC} ${CFLAGS} ${FOO_OBJS} ${FOO_LIBS} -o $@+
+# Assembly listing
+ALL_ASM := ${ALL_OBJS:%.o=%.s}+asm: ${ALL_ASM}+
+# Check that build is complete.
+check: all
+#TODO: tests
+# ${FOO_TARGET}+
+# Remove all targets.
+clean:
+ ${RM} ${ALL_ASM} ${ALL_OBJS} ${ALL_DEPS}+ ${RM} ${ALL_TARGETS}+ -rmdir ${TESTBINDIR} ${WORKDIR}/tests ${WORKDIR}/x86 ${WORKDIR}+
+# Make everything depend on changes in the Makefile
+${ALL_ASM} ${ALL_OBJS} ${ALL_DEPS} ${ALL_TARGETS} : Makefile+
+# Specify which targets are phony for GNU make
+.PHONY : all clean check
+
+# Rules
+${WORKDIR}/%.d: ${LIBSRCDIR}/%.c+ mkdir -p ${dir $@}+ ${MAKEDEPEND} ${CINCLUDE} ${CFLAGS} $< -MT ${@:%.d=%.o} > $@+ ${MAKEDEPEND} ${CINCLUDE} ${CFLAGS} $< -MT ${@:%.d=%.s} >> $@+ ${MAKEDEPEND} ${CINCLUDE} ${CFLAGS} $< -MT $@ >> $@+${WORKDIR}/%.s: ${LIBSRCDIR}/%.c+ mkdir -p ${dir $@}+ ${CC} ${CINCLUDE} ${CFLAGS} -S -o $@ $<+${WORKDIR}/%.o: ${LIBSRCDIR}/%.c+ mkdir -p ${dir $@}+ ${CC} ${CINCLUDE} ${CFLAGS} -c -o $@ $<+
+${WORKDIR}/%.d : ${BINSRCDIR}/%.c+ mkdir -p ${dir $@}+ ${MAKEDEPEND} ${CINCLUDE} ${CFLAGS} $< -MT ${@:%.d=%.o} > $@+${WORKDIR}/%.s : ${BINSRCDIR}/%.c ${WORKDIR}/%.o+ mkdir -p ${dir $@}+ ${CC} ${CINCLUDE} ${CFLAGS} -S -o $@ $<+${WORKDIR}/%.o : ${BINSRCDIR}/%.c+ mkdir -p ${dir $@}+ ${CC} ${CINCLUDE} ${CFLAGS} -c -o $@ $<+
+# Include header file dependencies
+include ${ALL_DEPS}