ref: 3c7191a95f14df6a0d88649024c453807ec99c6b
dir: /examples/seeking_example.c/
/*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 <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;
}