ref: 7af9c20656f528fe2329d91197d4f83094d7715a
dir: /common/libsndfile/src/svx.c/
/*
** Copyright (C) 1999-2002 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 <string.h>
#include <ctype.h>
#include <stdarg.h>
#include "sndfile.h"
#include "config.h"
#include "sfendian.h"
#include "common.h"
/*------------------------------------------------------------------------------
* Macros to handle big/little endian issues.
*/
#define FORM_MARKER (MAKE_MARKER ('F', 'O', 'R', 'M'))
#define SVX8_MARKER (MAKE_MARKER ('8', 'S', 'V', 'X'))
#define SV16_MARKER (MAKE_MARKER ('1', '6', 'S', 'V'))
#define VHDR_MARKER (MAKE_MARKER ('V', 'H', 'D', 'R'))
#define BODY_MARKER (MAKE_MARKER ('B', 'O', 'D', 'Y'))
#define ATAK_MARKER (MAKE_MARKER ('A','T','A','K'))
#define RLSE_MARKER (MAKE_MARKER ('R','L','S','E'))
#define c_MARKER (MAKE_MARKER ('(', 'c', ')', ' '))
#define NAME_MARKER (MAKE_MARKER ('N', 'A', 'M', 'E'))
#define AUTH_MARKER (MAKE_MARKER ('A', 'U', 'T', 'H'))
#define ANNO_MARKER (MAKE_MARKER ('A', 'N', 'N', 'O'))
#define CHAN_MARKER (MAKE_MARKER ('C', 'H', 'A', 'N'))
/*------------------------------------------------------------------------------
* Typedefs for file chunks.
*/
typedef struct
{ unsigned int oneShotHiSamples, repeatHiSamples, samplesPerHiCycle ;
unsigned short samplesPerSec ;
unsigned char octave, compression ;
unsigned int volume ;
} VHDR_CHUNK ;
enum {
HAVE_FORM = 0x01,
HAVE_SVX = 0x02,
HAVE_VHDR = 0x04,
HAVE_BODY = 0x08
} ;
/*------------------------------------------------------------------------------
* Private static functions.
*/
static int svx_close (SF_PRIVATE *psf) ;
static int svx_write_header (SF_PRIVATE *psf) ;
static int svx_read_header (SF_PRIVATE *psf) ;
/*------------------------------------------------------------------------------
** Public function.
*/
int
svx_open (SF_PRIVATE *psf)
{ int error, subformat ;
if (psf->mode == SFM_READ || (psf->mode == SFM_RDWR && psf->filelength > 0))
{ if ((error = svx_read_header (psf)))
return error ;
psf->endian = SF_ENDIAN_BIG ; /* All SVX files are big endian. */
psf->blockwidth = psf->sf.channels * psf->bytewidth ;
if (psf->blockwidth)
psf->sf.samples = psf->datalength / psf->blockwidth ;
psf_fseek (psf->filedes, psf->dataoffset, SEEK_SET) ;
} ;
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_SVX)
return SFE_BAD_OPEN_FORMAT ;
psf->endian = psf->sf.format & SF_FORMAT_ENDMASK ;
if (psf->endian == SF_ENDIAN_LITTLE || (CPU_IS_LITTLE_ENDIAN && psf->endian == SF_ENDIAN_CPU))
return SFE_BAD_ENDIAN ;
psf->endian = SF_ENDIAN_BIG ; /* All SVX files are big endian. */
error = svx_write_header (psf) ;
if (error)
return error ;
psf->write_header = svx_write_header ;
} ;
psf->close = svx_close ;
if (psf->bytewidth == 1)
psf->chars = SF_CHARS_SIGNED ;
if ((error = pcm_init (psf)))
return error ;
return 0 ;
} /* svx_open */
/*------------------------------------------------------------------------------
*/
static int
svx_read_header (SF_PRIVATE *psf)
{ VHDR_CHUNK vhdr ;
unsigned int FORMsize, vhdrsize, dword, marker ;
int filetype = 0, parsestage = 0, done = 0 ;
int bytecount = 0, channels ;
psf_binheader_readf (psf, "p", 0) ;
/* Set default number of channels. */
psf->sf.channels = 1 ;
psf->sf.format = SF_FORMAT_SVX ;
while (! done)
{ psf_binheader_readf (psf, "m", &marker) ;
switch (marker)
{ case FORM_MARKER :
if (parsestage)
return SFE_SVX_NO_FORM ;
psf_binheader_readf (psf, "E4", &FORMsize) ;
if (FORMsize != psf->filelength - 2 * sizeof (dword))
{ dword = psf->filelength - 2 * sizeof (dword);
psf_log_printf (psf, "FORM : %d (should be %d)\n", FORMsize, dword) ;
FORMsize = dword ;
}
else
psf_log_printf (psf, "FORM : %d\n", FORMsize) ;
parsestage |= HAVE_FORM ;
break ;
case SVX8_MARKER :
case SV16_MARKER :
if (! (parsestage & HAVE_FORM))
return SFE_SVX_NO_FORM ;
filetype = marker ;
psf_log_printf (psf, " %D\n", marker) ;
parsestage |= HAVE_SVX ;
break ;
case VHDR_MARKER :
if (! (parsestage & (HAVE_FORM | HAVE_SVX)))
return SFE_SVX_NO_FORM ;
psf_binheader_readf (psf, "E4", &vhdrsize) ;
psf_log_printf (psf, " VHDR : %d\n", vhdrsize) ;
psf_binheader_readf (psf, "E4442114", &(vhdr.oneShotHiSamples), &(vhdr.repeatHiSamples),
&(vhdr.samplesPerHiCycle), &(vhdr.samplesPerSec), &(vhdr.octave), &(vhdr.compression),
&(vhdr.volume)) ;
psf_log_printf (psf, " OneShotHiSamples : %d\n", vhdr.oneShotHiSamples) ;
psf_log_printf (psf, " RepeatHiSamples : %d\n", vhdr.repeatHiSamples) ;
psf_log_printf (psf, " samplesPerHiCycle : %d\n", vhdr.samplesPerHiCycle) ;
psf_log_printf (psf, " Sample Rate : %d\n", vhdr.samplesPerSec) ;
psf_log_printf (psf, " Octave : %d\n", vhdr.octave) ;
psf_log_printf (psf, " Compression : %d => ", vhdr.compression) ;
switch (vhdr.compression)
{ case 0 : psf_log_printf (psf, "None.\n") ;
break ;
case 1 : psf_log_printf (psf, "Fibonacci delta\n") ;
break ;
case 2 : psf_log_printf (psf, "Exponential delta\n") ;
break ;
} ;
psf_log_printf (psf, " Volume : %d\n", vhdr.volume) ;
psf->sf.samplerate = vhdr.samplesPerSec ;
if (filetype == SVX8_MARKER)
{ psf->sf.format |= SF_FORMAT_PCM_S8 ;
psf->bytewidth = 1 ;
}
else if (filetype == SV16_MARKER)
{ psf->sf.format |= SF_FORMAT_PCM_16 ;
psf->bytewidth = 2 ;
} ;
parsestage |= HAVE_VHDR ;
break ;
case BODY_MARKER :
if (! (parsestage & HAVE_VHDR))
return SFE_SVX_NO_BODY ;
psf_binheader_readf (psf, "E4", &dword) ;
psf->datalength = dword ;
psf->dataoffset = psf_ftell (psf->filedes) ;
if (psf->datalength > psf->filelength - psf->dataoffset)
{ psf_log_printf (psf, " BODY : %d (should be %d)\n", psf->datalength, psf->filelength - psf->dataoffset) ;
psf->datalength = psf->filelength - psf->dataoffset ;
}
else
psf_log_printf (psf, " BODY : %d\n", psf->datalength) ;
parsestage |= HAVE_BODY ;
if (! psf->sf.seekable)
break ;
psf_fseek (psf->filedes, psf->datalength, SEEK_CUR) ;
break ;
case NAME_MARKER :
case ANNO_MARKER :
if (! (parsestage & HAVE_SVX))
return SFE_SVX_NO_FORM ;
psf_binheader_readf (psf, "E4", &dword) ;
psf_log_printf (psf, " %D : %d\n", marker, dword) ;
psf_binheader_readf (psf, "j", dword) ;
break ;
case CHAN_MARKER :
if (! (parsestage & HAVE_SVX))
return SFE_SVX_NO_FORM ;
psf_binheader_readf (psf, "E4", &dword) ;
psf_log_printf (psf, " %D : %d\n", marker, dword) ;
bytecount += psf_binheader_readf (psf, "E4", &channels) ;
psf_log_printf (psf, " Channels : %d => %d\n", channels) ;
psf_binheader_readf (psf, "j", dword - bytecount) ;
break ;
case AUTH_MARKER :
case c_MARKER :
if (! (parsestage & HAVE_SVX))
return SFE_SVX_NO_FORM ;
psf_binheader_readf (psf, "E4", &dword) ;
psf_log_printf (psf, " %D : %d\n", marker, dword) ;
psf_binheader_readf (psf, "j", dword) ;
break ;
default :
if (isprint ((marker >> 24) & 0xFF) && isprint ((marker >> 16) & 0xFF)
&& isprint ((marker >> 8) & 0xFF) && isprint (marker & 0xFF))
{ psf_binheader_readf (psf, "E4", &dword) ;
psf_log_printf (psf, "%D : %d (unknown marker)\n", marker, dword) ;
psf_binheader_readf (psf, "j", dword) ;
break ;
} ;
if ((dword = psf_ftell (psf->filedes)) & 0x03)
{ psf_log_printf (psf, " Unknown chunk marker at position %d. Resynching.\n", dword - 4) ;
psf_binheader_readf (psf, "j", -3) ;
break ;
} ;
psf_log_printf (psf, "*** Unknown chunk marker : %X. Exiting parser.\n", marker) ;
done = 1 ;
} ; /* switch (marker) */
if (psf_ferror (psf->filedes))
{ psf_log_printf (psf, "*** Error on file handle. ***\n", marker) ;
psf_fclearerr (psf->filedes) ;
break ;
} ;
if (! psf->sf.seekable && (parsestage & HAVE_BODY))
break ;
if (psf_ftell (psf->filedes) >= (sf_count_t) (psf->filelength - (2 * sizeof (dword))))
break ;
} ; /* while (1) */
if (vhdr.compression)
return SFE_SVX_BAD_COMP ;
if (! psf->dataoffset)
return SFE_SVX_NO_DATA ;
return 0 ;
} /* svx_read_header */
static int
svx_close (SF_PRIVATE *psf)
{
if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR)
{ /* Now we know for certain the length of the file we can re-write
** correct values for the FORM, 8SVX and BODY chunks.
*/
psf_fseek (psf->filedes, 0, SEEK_END) ;
psf->filelength = psf_ftell (psf->filedes) ;
psf_fseek (psf->filedes, 0, SEEK_SET) ;
psf->datalength = psf->filelength - psf->dataoffset ;
svx_write_header (psf) ;
} ;
return 0 ;
} /* svx_close */
static int
svx_write_header (SF_PRIVATE *psf)
{ static char annotation [] = "libsndfile by Erik de Castro Lopo\0\0\0" ;
psf->header [0] = 0 ;
psf->headindex = 0 ;
psf_fseek (psf->filedes, 0, SEEK_SET) ;
/* FORM marker and FORM size. */
psf_binheader_writef (psf, "Etm8", FORM_MARKER, psf->filelength - 8) ;
psf_binheader_writef (psf, "m", (psf->bytewidth == 1) ? SVX8_MARKER : SV16_MARKER) ;
/* VHDR chunk. */
psf_binheader_writef (psf, "Em4", VHDR_MARKER, sizeof (VHDR_CHUNK)) ;
/* VHDR : oneShotHiSamples, repeatHiSamples, samplesPerHiCycle */
psf_binheader_writef (psf, "E444", psf->sf.samples, 0, 0) ;
/* VHDR : samplesPerSec, octave, compression */
psf_binheader_writef (psf, "E211", psf->sf.samplerate, 1, 0) ;
/* VHDR : volume */
psf_binheader_writef (psf, "E4", (psf->bytewidth == 1) ? 255 : 0xFFFF) ;
/* Filename and annotation strings. */
psf_binheader_writef (psf, "Emsms", NAME_MARKER, psf->filename, ANNO_MARKER, annotation) ;
/* BODY marker and size. */
psf_binheader_writef (psf, "Etm8", BODY_MARKER, psf->datalength) ;
psf_fwrite (psf->header, psf->headindex, 1, psf->filedes) ;
psf->dataoffset = psf->headindex ;
return 0 ;
} /* svx_write_header */