ref: d44e2d7e3a6e0cba9781f5366003212652d542e5
dir: /common/libsndfile/src/au.c/
/*
** Copyright (C) 1999-2001 Erik de Castro Lopo <erikd@zip.com.au>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU Lesser General Public License as published by
** the Free Software Foundation; either version 2.1 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include "sndfile.h"
#include "config.h"
#include "sfendian.h"
#include "common.h"
#include "au.h"
/*------------------------------------------------------------------------------
** Macros to handle big/little endian issues.
*/
#define DOTSND_MARKER (MAKE_MARKER ('.', 's', 'n', 'd'))
#define DNSDOT_MARKER (MAKE_MARKER ('d', 'n', 's', '.'))
#define AU_DATA_OFFSET 24
/*------------------------------------------------------------------------------
** Known AU file encoding types.
*/
enum
{ AU_ENCODING_ULAW_8 = 1, /* 8-bit u-law samples */
AU_ENCODING_PCM_8 = 2, /* 8-bit linear samples */
AU_ENCODING_PCM_16 = 3, /* 16-bit linear samples */
AU_ENCODING_PCM_24 = 4, /* 24-bit linear samples */
AU_ENCODING_PCM_32 = 5, /* 32-bit linear samples */
AU_ENCODING_FLOAT = 6, /* floating-point samples */
AU_ENCODING_DOUBLE = 7, /* double-precision float samples */
AU_ENCODING_INDIRECT = 8, /* fragmented sampled data */
AU_ENCODING_NESTED = 9, /* ? */
AU_ENCODING_DSP_CORE = 10, /* DSP program */
AU_ENCODING_DSP_DATA_8 = 11, /* 8-bit fixed-point samples */
AU_ENCODING_DSP_DATA_16 = 12, /* 16-bit fixed-point samples */
AU_ENCODING_DSP_DATA_24 = 13, /* 24-bit fixed-point samples */
AU_ENCODING_DSP_DATA_32 = 14, /* 32-bit fixed-point samples */
AU_ENCODING_DISPLAY = 16, /* non-audio display data */
AU_ENCODING_MULAW_SQUELCH = 17, /* ? */
AU_ENCODING_EMPHASIZED = 18, /* 16-bit linear with emphasis */
AU_ENCODING_NEXT = 19, /* 16-bit linear with compression (NEXT) */
AU_ENCODING_COMPRESSED_EMPHASIZED = 20, /* A combination of the two above */
AU_ENCODING_DSP_COMMANDS = 21, /* Music Kit DSP commands */
AU_ENCODING_DSP_COMMANDS_SAMPLES = 22, /* ? */
AU_ENCODING_ADPCM_G721_32 = 23, /* G721 32 kbs ADPCM - 4 bits per sample. */
AU_ENCODING_ADPCM_G722 = 24,
AU_ENCODING_ADPCM_G723_24 = 25, /* G723 24 kbs ADPCM - 3 bits per sample. */
AU_ENCODING_ADPCM_G723_5 = 26,
AU_ENCODING_ALAW_8 = 27
} ;
/*------------------------------------------------------------------------------
** Typedefs.
*/
typedef struct
{ int dataoffset ;
int datasize ;
int encoding ;
int samplerate ;
int channels ;
} AU_FMT ;
/*------------------------------------------------------------------------------
** Private static functions.
*/
static int au_close (SF_PRIVATE *psf) ;
static int get_encoding (unsigned int format, unsigned int bitwidth) ;
static char const* get_encoding_str(int format) ;
static int au_write_header (SF_PRIVATE *psf) ;
/*
static void endswap_au_fmt (AU_FMT *pau_fmt) ;
*/
/*------------------------------------------------------------------------------
** Public functions.
*/
int
au_open_read (SF_PRIVATE *psf)
{ AU_FMT au_fmt ;
unsigned int marker, dword ;
int error = SFE_NO_ERROR ;
psf_binheader_readf (psf, "pm", 0, &marker) ;
psf_log_printf (psf, "%D\n", marker) ;
if (marker == DOTSND_MARKER)
{ psf->endian = SF_ENDIAN_BIG ;
psf_binheader_readf (psf, "LLLLL", &(au_fmt.dataoffset), &(au_fmt.datasize),
&(au_fmt.encoding), &(au_fmt.samplerate), &(au_fmt.channels)) ;
}
else if (marker == DNSDOT_MARKER)
{ psf->endian = SF_ENDIAN_LITTLE ;
psf_binheader_readf (psf, "lllll", &(au_fmt.dataoffset), &(au_fmt.datasize),
&(au_fmt.encoding), &(au_fmt.samplerate), &(au_fmt.channels)) ;
}
else
return SFE_AU_NO_DOTSND ;
psf_log_printf (psf, " Data Offset : %d\n", au_fmt.dataoffset) ;
if (au_fmt.datasize == 0xFFFFFFFF || au_fmt.dataoffset + au_fmt.datasize == psf->filelength)
psf_log_printf (psf, " Data Size : %d\n", au_fmt.datasize) ;
else if (au_fmt.dataoffset + au_fmt.datasize < psf->filelength)
{ psf->filelength = au_fmt.dataoffset + au_fmt.dataoffset ;
psf_log_printf (psf, " Data Size : %d\n", au_fmt.datasize) ;
}
else
{ dword = psf->filelength - au_fmt.dataoffset ;
psf_log_printf (psf, " Data Size : %d (should be %d)\n", au_fmt.datasize, dword) ;
au_fmt.datasize = dword ;
} ;
psf->dataoffset = au_fmt.dataoffset ;
psf->datalength = psf->filelength - psf->dataoffset ;
psf->current = 0 ;
if (fseek (psf->file, psf->dataoffset, SEEK_SET))
return SFE_BAD_SEEK ;
psf->close = (func_close) au_close ;
psf->sf.samplerate = au_fmt.samplerate ;
psf->sf.channels = au_fmt.channels ;
/* Only fill in type major. */
if (psf->endian == SF_ENDIAN_BIG)
psf->sf.format = SF_FORMAT_AU ;
else if (psf->endian == SF_ENDIAN_LITTLE)
psf->sf.format = SF_FORMAT_AULE ;
psf->sf.sections = 1 ;
psf_log_printf (psf, " Encoding : %d => %s\n", au_fmt.encoding, get_encoding_str (au_fmt.encoding)) ;
psf_log_printf (psf, " Sample Rate : %d\n", au_fmt.samplerate) ;
psf_log_printf (psf, " Channels : %d\n", au_fmt.channels) ;
switch (au_fmt.encoding)
{ case AU_ENCODING_PCM_8 :
psf->sf.pcmbitwidth = 8 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_PCM ;
psf->chars = SF_CHARS_SIGNED ;
if ((error = pcm_read_init (psf)))
return error ;
break ;
case AU_ENCODING_PCM_16 :
psf->sf.pcmbitwidth = 16 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_PCM ;
if ((error = pcm_read_init (psf)))
return error ;
break ;
case AU_ENCODING_PCM_24 :
psf->sf.pcmbitwidth = 24 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_PCM ;
if ((error = pcm_read_init (psf)))
return error ;
break ;
case AU_ENCODING_PCM_32 :
psf->sf.pcmbitwidth = 32 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_PCM ;
if ((error = pcm_read_init (psf)))
return error ;
break ;
case AU_ENCODING_FLOAT :
psf->sf.pcmbitwidth = 32 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_FLOAT ;
float32_read_init (psf) ;
break ;
default :
error = SFE_AU_UNKNOWN_FORMAT ;
break ;
} ;
if (error)
return error ;
if (! psf->sf.samples && psf->blockwidth)
psf->sf.samples = au_fmt.datasize / psf->blockwidth ;
return 0 ;
} /* au_open_read */
/*------------------------------------------------------------------------------
*/
int
au_open_write (SF_PRIVATE *psf)
{ unsigned int encoding, format, subformat ;
int error = 0 ;
format = psf->sf.format & SF_FORMAT_TYPEMASK ;
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
if (format == SF_FORMAT_AU)
psf->endian = SF_ENDIAN_BIG ;
else if (format == SF_FORMAT_AULE)
psf->endian = SF_ENDIAN_LITTLE ;
else
return SFE_BAD_OPEN_FORMAT ;
if (subformat == SF_FORMAT_ULAW || subformat == SF_FORMAT_ALAW ||
subformat == SF_FORMAT_G721_32 || subformat == SF_FORMAT_G723_24)
psf->bytewidth = 1 ;
else
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->sf.seekable = SF_TRUE ;
psf->error = 0 ;
psf->blockwidth = psf->bytewidth * psf->sf.channels ;
psf->dataoffset = AU_DATA_OFFSET ;
psf->datalength = psf->blockwidth * psf->sf.samples ;
psf->filelength = psf->datalength + psf->dataoffset ;
if (! (encoding = au_write_header (psf)))
return psf->error ;
psf->close = (func_close) au_close ;
psf->write_header = (func_wr_hdr) au_write_header ;
switch (encoding)
{ case AU_ENCODING_PCM_8 : /* 8-bit linear PCM. */
psf->chars = SF_CHARS_SIGNED ;
error = pcm_write_init (psf) ;
break ;
case AU_ENCODING_PCM_16 : /* 16-bit linear PCM. */
case AU_ENCODING_PCM_24 : /* 24-bit linear PCM */
case AU_ENCODING_PCM_32 : /* 32-bit linear PCM. */
error = pcm_write_init (psf) ;
break ;
case AU_ENCODING_FLOAT : /* 32-bit linear PCM. */
error = float32_write_init (psf) ;
break ;
default : break ;
} ;
return error ;
} /* au_open_write */
/*------------------------------------------------------------------------------
*/
static int
au_close (SF_PRIVATE *psf)
{
if (psf->mode == SF_MODE_WRITE)
{ /* Now we know for certain the length of the file we can
* re-write correct values for the datasize header element.
*/
fseek (psf->file, 0, SEEK_END) ;
psf->filelength = ftell (psf->file) ;
psf->datalength = psf->filelength - AU_DATA_OFFSET ;
fseek (psf->file, 0, SEEK_SET) ;
psf->sf.samples = psf->datalength / psf->blockwidth ;
au_write_header (psf) ;
} ;
if (psf->fdata)
free (psf->fdata) ;
psf->fdata = NULL ;
return 0 ;
} /* au_close */
static int
au_write_header (SF_PRIVATE *psf)
{ int encoding ;
encoding = get_encoding (psf->sf.format & SF_FORMAT_SUBMASK, psf->bytewidth * 8) ;
if (! encoding)
{ psf->error = SFE_BAD_OPEN_FORMAT ;
return encoding ;
} ;
/* Reset the current header length to zero. */
psf->header [0] = 0 ;
psf->headindex = 0 ;
fseek (psf->file, 0, SEEK_SET) ;
if (psf->endian == SF_ENDIAN_BIG)
{ psf_binheader_writef (psf, "mL", DOTSND_MARKER, AU_DATA_OFFSET) ;
psf_binheader_writef (psf, "LLLL", psf->datalength, encoding, psf->sf.samplerate, psf->sf.channels) ;
}
else if (psf->endian == SF_ENDIAN_LITTLE)
{ psf_binheader_writef (psf, "ml", DNSDOT_MARKER, AU_DATA_OFFSET) ;
psf_binheader_writef (psf, "llll", psf->datalength, encoding, psf->sf.samplerate, psf->sf.channels) ;
}
else
{ psf->error = SFE_BAD_OPEN_FORMAT ;
return encoding ;
} ;
/* Header construction complete so write it out. */
fwrite (psf->header, psf->headindex, 1, psf->file) ;
psf->dataoffset = psf->headindex ;
return encoding ;
} /* au_write_header */
static int
get_encoding (unsigned int format, unsigned int bitwidth)
{ if (format == SF_FORMAT_ULAW)
return AU_ENCODING_ULAW_8 ;
if (format == SF_FORMAT_ALAW)
return AU_ENCODING_ALAW_8 ;
if (format == SF_FORMAT_G721_32)
return AU_ENCODING_ADPCM_G721_32 ;
if (format == SF_FORMAT_G723_24)
return AU_ENCODING_ADPCM_G723_24 ;
if (format == SF_FORMAT_FLOAT)
return AU_ENCODING_FLOAT ;
if (format != SF_FORMAT_PCM)
return 0 ;
/* For PCM encoding, the header encoding field depends on the bitwidth. */
switch (bitwidth)
{ case 8 : return AU_ENCODING_PCM_8 ;
case 16 : return AU_ENCODING_PCM_16 ;
case 24 : return AU_ENCODING_PCM_24 ;
case 32 : return AU_ENCODING_PCM_32 ;
default : break ;
} ;
return 0 ;
} /* get_encoding */
/*-
static void
endswap_au_fmt (AU_FMT *pau_fmt)
{ pau_fmt->dataoffset = ENDSWAP_INT (pau_fmt->dataoffset) ;
pau_fmt->datasize = ENDSWAP_INT (pau_fmt->datasize) ;
pau_fmt->encoding = ENDSWAP_INT (pau_fmt->encoding) ;
pau_fmt->samplerate = ENDSWAP_INT (pau_fmt->samplerate) ;
pau_fmt->channels = ENDSWAP_INT (pau_fmt->channels) ;
} /+* endswap_au_fmt *+/
-*/
static char const*
get_encoding_str (int format)
{ switch (format)
{ case AU_ENCODING_ULAW_8 :
return "8-bit ISDN u-law" ;
case AU_ENCODING_PCM_8 :
return "8-bit linear PCM" ;
case AU_ENCODING_PCM_16 :
return "16-bit linear PCM" ;
case AU_ENCODING_PCM_24 :
return "24-bit linear PCM" ;
case AU_ENCODING_PCM_32 :
return "32-bit linear PCM" ;
case AU_ENCODING_FLOAT :
return "32-bit float" ;
case AU_ENCODING_ALAW_8 :
return "8-bit ISDN A-law" ;
case AU_ENCODING_ADPCM_G721_32 :
return "G721 32kbs ADPCM" ;
case AU_ENCODING_ADPCM_G723_24 :
return "G723 24kbs ADPCM" ;
case AU_ENCODING_NEXT :
return "Weird NeXT encoding format (unsupported)" ;
} ;
return "Unknown!!" ;
} /* get_encoding_str */