ref: 220bcea9c6eadd6378afaba28a3f3db6bad75c21
dir: /common/libsndfile/src/ircam.c/
/*
** Copyright (C) 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"
/*------------------------------------------------------------------------------
** 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_02_MARKER (MAKE_MARKER (0x00, 0x02, 0xA3, 0x64))
#define IRCAM_03_MARKER (MAKE_MARKER (0x64, 0xA3, 0x03, 0x00))
#define IRCAM_04_MARKER (MAKE_MARKER (0x64, 0xA3, 0x04, 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 get_encoding (SF_PRIVATE *psf) ;
static char* get_encoding_str (int encoding) ;
/*------------------------------------------------------------------------------
** Public functions.
*/
int
ircam_open_read (SF_PRIVATE *psf)
{ unsigned int marker, encoding ;
float samplerate ;
int error = SFE_NO_ERROR ;
psf_binheader_readf (psf, "pm", 0, &marker) ;
if (marker == IRCAM_03_MARKER)
{ psf->endian = SF_ENDIAN_LITTLE ;
if (CPU_IS_LITTLE_ENDIAN)
marker = ENDSWAP_INT (marker) ;
psf_log_printf (psf, "marker: 0x%X => little endian\n", marker) ;
psf_binheader_readf (psf, "fll", &samplerate, &(psf->sf.channels), &encoding) ;
psf->sf.samplerate = (int) samplerate ;
psf_log_printf (psf, " Sample Rate : %d\n", psf->sf.samplerate) ;
psf_log_printf (psf, " Channels : %d\n", psf->sf.channels) ;
psf_log_printf (psf, " Encoding : %X => %s\n", encoding, get_encoding_str (encoding)) ;
}
else if (marker == IRCAM_02_MARKER || marker == IRCAM_04_MARKER)
{ psf->endian = SF_ENDIAN_BIG ;
if (CPU_IS_BIG_ENDIAN)
marker = ENDSWAP_INT (marker) ;
psf_log_printf (psf, "marker: 0x%X => big endian\n", marker) ;
psf_binheader_readf (psf, "FLL", &samplerate, &(psf->sf.channels), &encoding) ;
psf->sf.samplerate = (int) samplerate ;
psf_log_printf (psf, " Sample Rate : %d\n", psf->sf.samplerate) ;
psf_log_printf (psf, " Channels : %d\n", psf->sf.channels) ;
psf_log_printf (psf, " Encoding : %X => %s\n", encoding, get_encoding_str (encoding)) ;
}
else
return SFE_IRCAM_NO_MARKER ;
/* Sanit checking for endian-ness detection. */
if (psf->sf.channels > 256)
return SFE_IRCAM_BAD_CHANNELS ;
psf->sf.sections = 1 ;
psf->sf.seekable = SF_TRUE ;
switch (encoding)
{ case IRCAM_PCM_16 :
psf->sf.pcmbitwidth = 16 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
if (psf->endian == SF_ENDIAN_BIG)
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_BE ;
else
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_LE ;
error = pcm_read_init (psf) ;
break ;
case IRCAM_PCM_32 :
psf->sf.pcmbitwidth = 32 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
if (psf->endian == SF_ENDIAN_BIG)
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_BE ;
else
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_LE ;
error = pcm_read_init (psf) ;
break ;
case IRCAM_FLOAT :
psf->sf.pcmbitwidth = 32 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
if (psf->endian == SF_ENDIAN_BIG)
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_FLOAT_BE ;
else
psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_FLOAT_LE ;
error = float32_read_init (psf) ;
break ;
default :
error = SFE_IRCAM_UNKNOWN_FORMAT ;
break ;
} ;
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_open_read */
/*------------------------------------------------------------------------------
*/
int
ircam_open_write (SF_PRIVATE *psf)
{ unsigned int encoding, subformat ;
int error = SFE_NO_ERROR ;
if ((psf->sf.format & SF_FORMAT_TYPEMASK) != SF_FORMAT_IRCAM)
return SFE_BAD_OPEN_FORMAT ;
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
if (subformat == SF_FORMAT_ULAW || subformat == SF_FORMAT_ALAW)
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 = IRCAM_DATA_OFFSET ;
psf->datalength = psf->blockwidth * psf->sf.samples ;
psf->filelength = psf->datalength + psf->dataoffset ;
if (! (encoding = ircam_write_header (psf)))
return psf->error ;
psf->close = (func_close) ircam_close ;
psf->write_header = (func_wr_hdr) ircam_write_header ;
switch (encoding)
{ case IRCAM_PCM_16 : /* 16-bit linear PCM. */
case IRCAM_PCM_32 : /* 32-bit linear PCM. */
error = pcm_write_init (psf) ;
break ;
case IRCAM_FLOAT : /* 32-bit linear PCM. */
error = float32_write_init (psf) ;
break ;
default : break ;
} ;
return error ;
} /* ircam_open_write */
/*------------------------------------------------------------------------------
*/
static int
ircam_close (SF_PRIVATE *psf)
{
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) ;
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) ;
samplerate = psf->sf.samplerate ;
if (psf->endian == SF_ENDIAN_BIG)
{ psf_binheader_writef (psf, "mF", IRCAM_02_MARKER, samplerate) ;
psf_binheader_writef (psf, "LL", psf->sf.channels, encoding) ;
}
else if (psf->endian == SF_ENDIAN_LITTLE)
{ psf_binheader_writef (psf, "mf", IRCAM_03_MARKER, samplerate) ;
psf_binheader_writef (psf, "ll", psf->sf.channels, encoding) ;
}
else
{ psf->error = SFE_BAD_OPEN_FORMAT ;
return encoding ;
} ;
psf_binheader_writef (psf, "z", IRCAM_DATA_OFFSET - psf->headindex) ;
/* Header construction complete so write it out. */
fwrite (psf->header, psf->headindex, 1, psf->file) ;
return encoding ;
} /* ircam_write_header */
static int
get_encoding (SF_PRIVATE *psf)
{ unsigned int format, bitwidth ;
format = psf->sf.format & SF_FORMAT_SUBMASK ;
bitwidth = psf->bytewidth * 8 ;
/* Default endian-ness is the same as host processor unless overridden. */
if (format == SF_FORMAT_PCM_BE || format == SF_FORMAT_FLOAT_BE)
psf->endian = SF_ENDIAN_BIG ;
else if (format == SF_FORMAT_PCM_LE || format == SF_FORMAT_FLOAT_LE)
psf->endian = SF_ENDIAN_LITTLE ;
else if (CPU_IS_BIG_ENDIAN)
psf->endian = SF_ENDIAN_BIG ;
else
psf->endian = SF_ENDIAN_LITTLE ;
switch (format)
{ case SF_FORMAT_ULAW : return IRCAM_ULAW ;
case SF_FORMAT_ALAW : return IRCAM_ALAW ;
case SF_FORMAT_PCM :
case SF_FORMAT_PCM_BE :
case SF_FORMAT_PCM_LE :
/* For PCM encoding, the header encoding field depends on the bitwidth. */
switch (bitwidth)
{ case 16 : return IRCAM_PCM_16 ;
case 32 : return IRCAM_PCM_32 ;
default : break ;
} ;
break ;
case SF_FORMAT_FLOAT :
case SF_FORMAT_FLOAT_BE :
case SF_FORMAT_FLOAT_LE :
return IRCAM_FLOAT ;
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 */