ref: 3a0e440fef1a9834cd377512485c407ec0213bce
dir: /common/libsndfile/src/au.c/
/*
** Copyright (C) 1999-2000 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 "pcm.h"
#include "au.h"
#include "ulaw.h"
#include "alaw.h"
/*------------------------------------------------------------------------------
** Macros to handle big/little endian issues.
*/
#if (CPU_IS_LITTLE_ENDIAN == 1)
#define MAKE_MARKER(a,b,c,d) ((a)|((b)<<8)|((c)<<16)|((d)<<24))
#elif (CPU_IS_BIG_ENDIAN == 1)
#define MAKE_MARKER(a,b,c,d) (((a)<<24)|((b)<<16)|((c)<<8)|(d))
#else
#error "Cannot determine endian-ness of processor."
#endif
#define DOTSND_MARKER (MAKE_MARKER ('.', 's', 'n', 'd'))
#define DNSDOT_MARKER (MAKE_MARKER ('d', 'n', 's', '.'))
/*------------------------------------------------------------------------------
** 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* get_encoding_str(int format) ;
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 big_endian_file, error = SFE_NO_ERROR ;
fread (&marker, sizeof (marker), 1, psf->file) ;
if (marker == DOTSND_MARKER)
big_endian_file = 1 ;
else if (marker == DNSDOT_MARKER)
big_endian_file = 0 ;
else
return SFE_AU_NO_DOTSND ;
psf_sprintf (psf, "%D\n", marker) ;
fread (&au_fmt, sizeof (AU_FMT), 1, psf->file) ;
if (CPU_IS_LITTLE_ENDIAN && big_endian_file)
endswap_au_fmt (&au_fmt) ;
else if (CPU_IS_BIG_ENDIAN && ! big_endian_file)
endswap_au_fmt (&au_fmt) ;
psf_sprintf (psf, " Data Offset : %d\n", au_fmt.dataoffset) ;
if (au_fmt.dataoffset + au_fmt.datasize != psf->filelength)
{ dword = psf->filelength - au_fmt.dataoffset ;
psf_sprintf (psf, " Data Size : %d (should be %d)\n", au_fmt.datasize, dword) ;
au_fmt.datasize = dword ;
}
else
psf_sprintf (psf, " Data Size : %d\n", au_fmt.datasize) ;
psf->dataoffset = au_fmt.dataoffset ;
psf->datalength = psf->filelength - psf->dataoffset ;
psf->current = 0 ;
psf->endian = big_endian_file ? SF_ENDIAN_BIG : SF_ENDIAN_LITTLE ;
psf->sf.seekable = SF_TRUE ;
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. */
psf->sf.format = big_endian_file ? SF_FORMAT_AU : SF_FORMAT_AULE ;
psf->sf.sections = 1 ;
psf_sprintf (psf, " Encoding : %d => %s\n", au_fmt.encoding, get_encoding_str (au_fmt.encoding)) ;
psf_sprintf (psf, " Sample Rate : %d\n", au_fmt.samplerate) ;
psf_sprintf (psf, " Channels : %d\n", au_fmt.channels) ;
switch (au_fmt.encoding)
{ case AU_ENCODING_ULAW_8 :
psf->sf.pcmbitwidth = 16 ; /* After decoding */
psf->bytewidth = 1 ; /* Before decoding */
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_ULAW ;
psf->read_short = (func_short) ulaw_read_ulaw2s ;
psf->read_int = (func_int) ulaw_read_ulaw2i ;
psf->read_double = (func_double) ulaw_read_ulaw2d ;
break ;
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->read_short = (func_short) pcm_read_sc2s ;
psf->read_int = (func_int) pcm_read_sc2i ;
psf->read_double = (func_double) pcm_read_sc2d ;
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 (big_endian_file)
{ psf->read_short = (func_short) pcm_read_bes2s ;
psf->read_int = (func_int) pcm_read_bes2i ;
psf->read_double = (func_double) pcm_read_bes2d ;
}
else
{ psf->read_short = (func_short) pcm_read_les2s ;
psf->read_int = (func_int) pcm_read_les2i ;
psf->read_double = (func_double) pcm_read_les2d ;
} ;
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 (big_endian_file)
{ psf->read_short = (func_short) pcm_read_bet2s ;
psf->read_int = (func_int) pcm_read_bet2i ;
psf->read_double = (func_double) pcm_read_bet2d ;
}
else
{ psf->read_short = (func_short) pcm_read_let2s ;
psf->read_int = (func_int) pcm_read_let2i ;
psf->read_double = (func_double) pcm_read_let2d ;
} ;
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 (big_endian_file)
{ psf->read_short = (func_short) pcm_read_bei2s ;
psf->read_int = (func_int) pcm_read_bei2i ;
psf->read_double = (func_double) pcm_read_bei2d ;
}
else
{ psf->read_short = (func_short) pcm_read_lei2s ;
psf->read_int = (func_int) pcm_read_lei2i ;
psf->read_double = (func_double) pcm_read_lei2d ;
} ;
break ;
case AU_ENCODING_ALAW_8 :
psf->sf.pcmbitwidth = 16 ; /* After decoding */
psf->bytewidth = 1 ; /* Before decoding */
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_ALAW ;
psf->read_short = (func_short) alaw_read_alaw2s ;
psf->read_int = (func_int) alaw_read_alaw2i ;
psf->read_double = (func_double) alaw_read_alaw2d ;
break ;
case AU_ENCODING_ADPCM_G721_32 : /* G721 32kbs ADPCM */
if (psf->sf.channels != 1)
{ psf_sprintf (psf, "Channels != 1\n") ;
break ;
} ;
psf->sf.pcmbitwidth = 16 ; /* After decoding */
psf->sf.format |= SF_FORMAT_G721_32 ;
error = au_g72x_reader_init (psf, AU_H_G721_32) ;
psf->sf.seekable = SF_FALSE ;
break ;
case AU_ENCODING_ADPCM_G723_24 : /* G723 24kbs ADPCM */
if (psf->sf.channels != 1)
{ psf_sprintf (psf, "Channels != 1\n") ;
break ;
} ;
psf->sf.pcmbitwidth = 16 ; /* After decoding */
psf->sf.format |= SF_FORMAT_G723_24 ;
error = au_g72x_reader_init (psf, AU_H_G723_24) ;
psf->sf.seekable = SF_FALSE ;
break ;
case AU_ENCODING_NEXT :
error = SFE_AU_UNKNOWN_FORMAT ;
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_nh_open_read (SF_PRIVATE *psf)
{ if (fseek (psf->file, psf->dataoffset, SEEK_SET))
return SFE_BAD_SEEK ;
psf_sprintf (psf, "Setting up for 8kHz, mono, u-law.\n") ;
psf->sf.format = SF_FORMAT_AU | SF_FORMAT_ULAW ;
psf->dataoffset = 0 ;
psf->current = 0 ;
psf->endian = 0 ; /* Irrelevant but it must be something. */
psf->sf.seekable = SF_TRUE ;
psf->sf.samplerate = 8000 ;
psf->sf.channels = 1 ;
psf->sf.sections = 1 ;
psf->sf.pcmbitwidth = 16 ; /* After decoding */
psf->bytewidth = 1 ; /* Before decoding */
psf->read_short = (func_short) ulaw_read_ulaw2s ;
psf->read_int = (func_int) ulaw_read_ulaw2i ;
psf->read_double = (func_double) ulaw_read_ulaw2d ;
psf->close = (func_close) au_close ;
psf->blockwidth = 1 ;
psf->sf.samples = psf->filelength ;
psf->datalength = psf->filelength ;
return 0 ;
} /* au_open_read */
/*------------------------------------------------------------------------------
*/
int au_open_write (SF_PRIVATE *psf)
{ AU_FMT au_fmt ;
unsigned int dword, encoding, format, subformat, big_endian_file ;
int error = 0 ;
format = psf->sf.format & SF_FORMAT_TYPEMASK ;
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
if (format == SF_FORMAT_AU)
big_endian_file = 1 ;
else if (format == SF_FORMAT_AULE)
big_endian_file = 0 ;
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->endian = big_endian_file ? SF_ENDIAN_BIG : SF_ENDIAN_LITTLE ;
psf->sf.seekable = SF_TRUE ;
psf->blockwidth = psf->bytewidth * psf->sf.channels ;
psf->dataoffset = 6 * sizeof (dword) ;
psf->datalength = psf->blockwidth * psf->sf.samples ;
psf->filelength = psf->datalength + psf->dataoffset ;
psf->error = 0 ;
encoding = get_encoding (subformat, psf->bytewidth * 8) ;
if (! encoding)
return SFE_BAD_OPEN_FORMAT ;
au_fmt.dataoffset = 24 ;
au_fmt.datasize = psf->datalength ;
au_fmt.encoding = encoding ;
au_fmt.samplerate = psf->sf.samplerate ;
au_fmt.channels = psf->sf.channels ;
if (CPU_IS_LITTLE_ENDIAN && big_endian_file)
endswap_au_fmt (&au_fmt) ;
else if (CPU_IS_BIG_ENDIAN && ! big_endian_file)
endswap_au_fmt (&au_fmt) ;
dword = big_endian_file ? DOTSND_MARKER : DNSDOT_MARKER ; /* Marker */
fwrite (&dword, sizeof (dword), 1, psf->file) ;
fwrite (&au_fmt, sizeof (AU_FMT), 1, psf->file) ;
psf->close = (func_close) au_close ;
switch (encoding)
{ case AU_ENCODING_ULAW_8 : /* 8-bit Ulaw encoding. */
psf->write_short = (func_short) ulaw_write_s2ulaw ;
psf->write_int = (func_int) ulaw_write_i2ulaw ;
psf->write_double = (func_double) ulaw_write_d2ulaw ;
break ;
case AU_ENCODING_PCM_8 : /* 8-bit linear PCM. */
psf->write_short = (func_short) pcm_write_s2sc ;
psf->write_int = (func_int) pcm_write_i2sc ;
psf->write_double = (func_double) pcm_write_d2sc ;
break ;
case AU_ENCODING_PCM_16 : /* 16-bit linear PCM. */
if (big_endian_file)
{ psf->write_short = (func_short) pcm_write_s2bes ;
psf->write_int = (func_int) pcm_write_i2bes ;
psf->write_double = (func_double) pcm_write_d2bes ;
}
else
{ psf->write_short = (func_short) pcm_write_s2les ;
psf->write_int = (func_int) pcm_write_i2les ;
psf->write_double = (func_double) pcm_write_d2les ;
} ;
break ;
case AU_ENCODING_PCM_24 : /* 24-bit linear PCM */
if (big_endian_file)
{ psf->write_short = (func_short) pcm_write_s2bet ;
psf->write_int = (func_int) pcm_write_i2bet ;
psf->write_double = (func_double) pcm_write_d2bet ;
}
else
{ psf->write_short = (func_short) pcm_write_s2let ;
psf->write_int = (func_int) pcm_write_i2let ;
psf->write_double = (func_double) pcm_write_d2let ;
} ;
break ;
case AU_ENCODING_PCM_32 : /* 32-bit linear PCM. */
if (big_endian_file)
{ psf->write_short = (func_short) pcm_write_s2bei ;
psf->write_int = (func_int) pcm_write_i2bei ;
psf->write_double = (func_double) pcm_write_d2bei ;
}
else
{ psf->write_short = (func_short) pcm_write_s2lei ;
psf->write_int = (func_int) pcm_write_i2lei ;
psf->write_double = (func_double) pcm_write_d2lei ;
} ;
break ;
case AU_ENCODING_ALAW_8 : /* 8-bit Alaw encoding. */
psf->write_short = (func_short) alaw_write_s2alaw ;
psf->write_int = (func_int) alaw_write_i2alaw ;
psf->write_double = (func_double) alaw_write_d2alaw ;
break ;
case AU_ENCODING_ADPCM_G721_32 :
if (psf->sf.channels != 1)
{ psf_sprintf (psf, "Channels != 1\n") ;
break ;
} ;
psf->sf.pcmbitwidth = 16 ; /* After decoding */
psf->bytewidth = 0 ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_G721_32 ;
error = au_g72x_writer_init (psf, AU_H_G721_32) ;
break ;
case AU_ENCODING_ADPCM_G723_24 :
if (psf->sf.channels != 1)
{ psf_sprintf (psf, "Channels != 1\n") ;
break ;
} ;
psf->sf.pcmbitwidth = 16 ; /* After decoding */
psf->bytewidth = 0 ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format |= SF_FORMAT_G721_32 ;
error = au_g72x_writer_init (psf, AU_H_G723_24) ;
break ;
default : break ;
} ;
return error ;
} /* au_open_write */
/*------------------------------------------------------------------------------
*/
int au_close (SF_PRIVATE *psf)
{ unsigned int dword ;
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 - psf->dataoffset ;
fseek (psf->file, 2 * sizeof (dword), SEEK_SET) ;
if (psf->endian == SF_ENDIAN_BIG)
dword = H2BE_INT (psf->datalength) ;
else if (psf->endian == SF_ENDIAN_LITTLE)
dword = H2LE_INT (psf->datalength) ;
else
dword = 0xFFFFFFFF ;
fwrite (&dword, sizeof (dword), 1, psf->file) ;
} ;
if (psf->fdata)
free (psf->fdata) ;
psf->fdata = NULL ;
return 0 ;
} /* au_close */
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_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* 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_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 */