ref: 7af9c20656f528fe2329d91197d4f83094d7715a
dir: /common/libsndfile/src/ircam.c/
/*
** Copyright (C) 2001-2002 Erik de Castro Lopo <[email protected]>
**
** 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"
/*------------------------------------------------------------------------------
** Macros to handle big/little endian issues.
*/
/* The IRCAM magic number is weird in that one byte in the number can have
** values of 0x1, 0x2, 0x03 or 0x04. Hence the need for a marker and a mask.
*/
#define IRCAM_BE_MASK (MAKE_MARKER (0xFF, 0xFF, 0x00, 0xFF))
#define IRCAM_BE_MARKER (MAKE_MARKER (0x64, 0xA3, 0x00, 0x00))
#define IRCAM_LE_MASK (MAKE_MARKER (0xFF, 0x00, 0xFF, 0xFF))
#define IRCAM_LE_MARKER (MAKE_MARKER (0x00, 0x00, 0xA3, 0x64))
#define IRCAM_02B_MARKER (MAKE_MARKER (0x00, 0x02, 0xA3, 0x64))
#define IRCAM_03L_MARKER (MAKE_MARKER (0x64, 0xA3, 0x03, 0x00))
#define IRCAM_DATA_OFFSET (1024)
/*------------------------------------------------------------------------------
** Typedefs.
*/
enum
{ IRCAM_PCM_16 = 0x00002,
IRCAM_FLOAT = 0x00004,
IRCAM_ALAW = 0x10001,
IRCAM_ULAW = 0x20001,
IRCAM_PCM_32 = 0x40004
} ;
/*------------------------------------------------------------------------------
** Private static functions.
*/
static int ircam_close (SF_PRIVATE *psf) ;
static int ircam_write_header (SF_PRIVATE *psf) ;
static int ircam_read_header (SF_PRIVATE *psf) ;
static int get_encoding (int subformat) ;
static char* get_encoding_str (int encoding) ;
/*------------------------------------------------------------------------------
** Public function.
*/
int
ircam_open (SF_PRIVATE *psf)
{ int subformat ;
int error = SFE_NO_ERROR ;
if (psf->mode == SFM_READ || (psf->mode == SFM_RDWR && psf->filelength > 0))
{ if ((error = ircam_read_header (psf)))
return error ;
} ;
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR)
{ if ((psf->sf.format & SF_FORMAT_TYPEMASK) != SF_FORMAT_IRCAM)
return SFE_BAD_OPEN_FORMAT ;
psf->endian = psf->sf.format & SF_FORMAT_ENDMASK ;
if (psf->endian == 0 || psf->endian == SF_ENDIAN_CPU)
psf->endian = (CPU_IS_BIG_ENDIAN) ? SF_ENDIAN_BIG : SF_ENDIAN_LITTLE ;
psf->dataoffset = IRCAM_DATA_OFFSET ;
if ((error = ircam_write_header (psf)))
return error ;
psf->write_header = ircam_write_header ;
} ;
psf->close = ircam_close ;
switch (subformat)
{ case SF_FORMAT_ULAW : /* 8-bit Ulaw encoding. */
error = ulaw_init (psf) ;
break ;
case SF_FORMAT_ALAW : /* 8-bit Alaw encoding. */
error = alaw_init (psf) ;
break ;
case SF_FORMAT_PCM_16 : /* 16-bit linear PCM. */
case SF_FORMAT_PCM_32 : /* 32-bit linear PCM. */
error = pcm_init (psf) ;
break ;
case SF_FORMAT_FLOAT : /* 32-bit linear PCM. */
error = float32_init (psf) ;
break ;
default : break ;
} ;
return error ;
} /* ircam_open */
/*------------------------------------------------------------------------------
*/
static int
ircam_read_header (SF_PRIVATE *psf)
{ unsigned int marker, encoding ;
float samplerate ;
int error = SFE_NO_ERROR ;
psf_binheader_readf (psf, "epmf44", 0, &marker, &samplerate, &(psf->sf.channels), &encoding) ;
if (((marker & IRCAM_LE_MASK) != IRCAM_LE_MARKER) &&
((marker & IRCAM_BE_MASK) != IRCAM_BE_MARKER))
{ psf_log_printf (psf, "marker: 0x%X\n", marker) ;
return SFE_IRCAM_NO_MARKER ;
} ;
psf->endian = SF_ENDIAN_LITTLE ;
if (psf->sf.channels > 256)
{ psf_binheader_readf (psf, "Epmf44", 0, &marker, &samplerate, &(psf->sf.channels), &encoding) ;
/* Sanity checking for endian-ness detection. */
if (psf->sf.channels > 256)
{ psf_log_printf (psf, "marker: 0x%X\n", marker) ;
return SFE_IRCAM_BAD_CHANNELS ;
} ;
psf->endian = SF_ENDIAN_BIG ;
} ;
psf_log_printf (psf, "marker: 0x%X\n", marker) ;
psf->sf.samplerate = (int) samplerate ;
psf_log_printf (psf, " Sample Rate : %d\n"
" Channels : %d\n"
" Encoding : %X => %s\n", psf->sf.samplerate, psf->sf.channels, encoding, get_encoding_str (encoding)) ;
switch (encoding)
{ case IRCAM_PCM_16 :
psf->bytewidth = 2 ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_16 ;
break ;
case IRCAM_PCM_32 :
psf->bytewidth = 4 ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_32 ;
break ;
case IRCAM_FLOAT :
psf->bytewidth = 4 ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_FLOAT ;
break ;
case IRCAM_ALAW :
psf->bytewidth = 1 ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_ALAW ;
break ;
case IRCAM_ULAW :
psf->bytewidth = 1 ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_ULAW ;
break ;
default :
error = SFE_IRCAM_UNKNOWN_FORMAT ;
break ;
} ;
if (psf->endian == SF_ENDIAN_BIG)
psf->sf.format |= SF_ENDIAN_BIG ;
else
psf->sf.format |= SF_ENDIAN_LITTLE ;
if (error)
return error ;
psf->dataoffset = IRCAM_DATA_OFFSET ;
psf->datalength = psf->filelength - psf->dataoffset ;
if (! psf->sf.samples && psf->blockwidth)
psf->sf.samples = psf->datalength / psf->blockwidth ;
psf_log_printf (psf, " Samples : %d\n", psf->sf.samples) ;
psf_binheader_readf (psf, "p", IRCAM_DATA_OFFSET) ;
return 0 ;
} /* ircam_read_header */
static int
ircam_close (SF_PRIVATE *psf)
{
psf_log_printf (psf, "close\n") ;
return 0 ;
} /* ircam_close */
static int
ircam_write_header (SF_PRIVATE *psf)
{ int encoding ;
float samplerate ;
/* This also sets psf->endian. */
encoding = get_encoding (psf->sf.format & SF_FORMAT_SUBMASK) ;
if (! encoding)
return SFE_BAD_OPEN_FORMAT ;
/* Reset the current header length to zero. */
psf->header [0] = 0 ;
psf->headindex = 0 ;
psf_fseek (psf->filedes, 0, SEEK_SET) ;
samplerate = psf->sf.samplerate ;
if (psf->endian == SF_ENDIAN_BIG)
{ psf_binheader_writef (psf, "Emf", IRCAM_02B_MARKER, samplerate) ;
psf_binheader_writef (psf, "E44", psf->sf.channels, encoding) ;
}
else if (psf->endian == SF_ENDIAN_LITTLE)
{ psf_binheader_writef (psf, "emf", IRCAM_03L_MARKER, samplerate) ;
psf_binheader_writef (psf, "e44", psf->sf.channels, encoding) ;
}
else
return SFE_BAD_OPEN_FORMAT ;
psf_binheader_writef (psf, "z", IRCAM_DATA_OFFSET - psf->headindex) ;
/* Header construction complete so write it out. */
psf_fwrite (psf->header, psf->headindex, 1, psf->filedes) ;
return 0 ;
} /* ircam_write_header */
static int
get_encoding (int subformat)
{ switch (subformat)
{ case SF_FORMAT_PCM_16 : return IRCAM_PCM_16 ;
case SF_FORMAT_PCM_32 : return IRCAM_PCM_32 ;
case SF_FORMAT_FLOAT : return IRCAM_FLOAT ;
case SF_FORMAT_ULAW : return IRCAM_ULAW ;
case SF_FORMAT_ALAW : return IRCAM_ALAW ;
default : break ;
} ;
return 0 ;
} /* get_encoding */
static char*
get_encoding_str (int encoding)
{ switch (encoding)
{ case IRCAM_PCM_16 : return "16 bit PCM" ;
case IRCAM_FLOAT : return "32 bit float" ;
case IRCAM_ALAW : return "A law" ;
case IRCAM_ULAW : return "u law" ;
case IRCAM_PCM_32 : return "32 bit PCM" ;
} ;
return "Unknown encoding" ;
} /* get_encoding_str */