ref: 3a0e440fef1a9834cd377512485c407ec0213bce
dir: /common/libsndfile/src/paf.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"
/*------------------------------------------------------------------------------
** 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 FAP_MARKER (MAKE_MARKER ('f', 'a', 'p', ' '))
#define PAF_MARKER (MAKE_MARKER (' ', 'p', 'a', 'f'))
/*------------------------------------------------------------------------------
** Other defines.
*/
#define PAF_HEADER_LENGTH 2048
/*------------------------------------------------------------------------------
** Typedefs.
*/
typedef struct
{ unsigned int version ;
unsigned int endianness ;
unsigned int samplerate ;
unsigned int format ;
unsigned int channels ;
unsigned int source ;
} PAF_FMT ;
typedef struct
{ unsigned int index, blocks, channels, samplesperblock, blockcount, blocksize, samplecount ;
unsigned char *block ;
int *samples ;
unsigned char data [4] ;
} PAF24_PRIVATE ;
/*------------------------------------------------------------------------------
** Private static functions.
*/
static int paf24_reader_init (SF_PRIVATE *psf) ;
static int paf24_writer_init (SF_PRIVATE *psf) ;
static int paf24_read_block (SF_PRIVATE *psf, PAF24_PRIVATE *ppaf24) ;
static int paf24_close (SF_PRIVATE *psf) ;
static int paf24_read_s (SF_PRIVATE *psf, short *ptr, int len) ;
static int paf24_read_i (SF_PRIVATE *psf, int *ptr, int len) ;
static int paf24_read_d (SF_PRIVATE *psf, double *ptr, int len, int normalize) ;
static int paf24_write_s (SF_PRIVATE *psf, short *ptr, int len) ;
static int paf24_write_i (SF_PRIVATE *psf, int *ptr, int len) ;
static int paf24_write_d (SF_PRIVATE *psf, double *ptr, int len, int normalize) ;
static off_t paf24_seek (SF_PRIVATE *psf, off_t offset, int whence) ;
static void endswap_paf_fmt (PAF_FMT *ppaf_fmt) ;
/*------------------------------------------------------------------------------
** Public functions.
*/
int paf_open_read (SF_PRIVATE *psf)
{ PAF_FMT paf_fmt ;
unsigned int marker ;
int error ;
fread (&marker, sizeof (marker), 1, psf->file) ;
if (marker != PAF_MARKER && marker != FAP_MARKER)
return SFE_PAF_NO_MARKER ;
psf_sprintf (psf, "Signature : %D\n", marker) ;
fread (&paf_fmt, sizeof (PAF_FMT), 1, psf->file) ;
if (CPU_IS_LITTLE_ENDIAN && marker == PAF_MARKER)
endswap_paf_fmt (&paf_fmt) ;
else if (CPU_IS_BIG_ENDIAN && marker == FAP_MARKER)
endswap_paf_fmt (&paf_fmt) ;
psf_sprintf (psf, "Version : %d\n", paf_fmt.version) ;
if (paf_fmt.version != 0)
{ psf_sprintf (psf, "*** Bad version number. Should be zero.\n") ;
return SFE_PAF_VERSION ;
} ;
psf_sprintf (psf, "Endianness : %d => ", paf_fmt.endianness) ;
if (paf_fmt.endianness)
psf_sprintf (psf, "Little\n", paf_fmt.endianness) ;
else
psf_sprintf (psf, "Big\n", paf_fmt.endianness) ;
psf_sprintf (psf, "Sample Rate : %d\n", paf_fmt.samplerate) ;
if (psf->filelength < PAF_HEADER_LENGTH)
return SFE_PAF_SHORT_HEADER ;
psf->dataoffset = PAF_HEADER_LENGTH ;
psf->datalength = psf->filelength - psf->dataoffset ;
psf->current = 0 ;
psf->endian = paf_fmt.endianness ? SF_ENDIAN_LITTLE : SF_ENDIAN_BIG ;
psf->sf.seekable = SF_TRUE ;
if (fseek (psf->file, psf->dataoffset, SEEK_SET))
return SFE_BAD_SEEK ;
psf->sf.samplerate = paf_fmt.samplerate ;
psf->sf.channels = paf_fmt.channels ;
/* Only fill in type major. */
psf->sf.format = SF_FORMAT_PAF ;
psf->sf.sections = 1 ;
psf_sprintf (psf, "Format : %d => ", paf_fmt.format) ;
switch (paf_fmt.format)
{ case 0 : psf_sprintf (psf, "16 bit linear PCM\n") ;
psf->sf.pcmbitwidth = 16 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->sf.format |= paf_fmt.endianness ? SF_FORMAT_PCM_LE : SF_FORMAT_PCM_BE ; ;
if (psf->endian == SF_ENDIAN_BIG)
{ 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 ;
} ;
psf->blockwidth = psf->bytewidth * psf->sf.channels ;
psf_sprintf (psf, "X blockwidth : %d\n", psf->blockwidth) ;
if (psf->blockwidth)
psf->sf.samples = psf->datalength / psf->blockwidth ;
else
psf_sprintf (psf, "*** Warning : blockwidth == 0.\n") ;
psf_sprintf (psf, "X samples : %d\n", psf->sf.samples) ;
break ;
case 1 : psf_sprintf (psf, "24 bit linear PCM\n") ;
psf->sf.pcmbitwidth = 24 ;
psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ;
psf->sf.format |= paf_fmt.endianness ? SF_FORMAT_PCM_LE : SF_FORMAT_PCM_BE ; ;
psf->read_short = (func_short) paf24_read_s ;
psf->read_int = (func_int) paf24_read_i ;
psf->read_double = (func_double) paf24_read_d ;
if ((error = paf24_reader_init (psf)))
return error ;
psf->seek_func = (func_seek) paf24_seek ;
psf->close = (func_close) paf24_close ;
psf->blockwidth = psf->bytewidth * psf->sf.channels ;
psf_sprintf (psf, "X blockwidth : %d\n", psf->blockwidth) ;
psf->sf.samples = 10 * psf->datalength / (32 * psf->sf.channels) ;
psf_sprintf (psf, "X samples : %d\n", psf->sf.samples) ;
break ;
default : psf_sprintf (psf, "Unknown\n") ;
return SFE_PAF_UNKNOWN_FORMAT ;
break ;
} ;
psf_sprintf (psf, "Channels : %d\n", paf_fmt.channels) ;
psf_sprintf (psf, "Source : %d => ", paf_fmt.source) ;
switch (paf_fmt.source)
{ case 1 : psf_sprintf (psf, "Analog Recording\n") ;
break ;
case 2 : psf_sprintf (psf, "Digital Transfer\n") ;
break ;
case 3 : psf_sprintf (psf, "Multi-track Mixdown\n") ;
break ;
case 5 : psf_sprintf (psf, "Audio Resulting From DSP Processing\n") ;
break ;
default : psf_sprintf (psf, "Unknown\n") ;
break ;
} ;
return 0 ;
} /* paf_open_read */
/*------------------------------------------------------------------------------
*/
int paf_open_write (SF_PRIVATE *psf)
{ PAF_FMT paf_fmt ;
int format, subformat, error, count ;
unsigned int marker, big_endian_file ;
format = psf->sf.format & SF_FORMAT_TYPEMASK ;
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
if (format != SF_FORMAT_PAF)
return SFE_BAD_OPEN_FORMAT ;
if (subformat == SF_FORMAT_PCM_BE)
{ big_endian_file = 1 ;
paf_fmt.endianness = 0 ;
}
else if (subformat == SF_FORMAT_PCM_LE)
{ big_endian_file = 0 ;
paf_fmt.endianness = 1 ;
}
else
return SFE_BAD_OPEN_FORMAT ;
paf_fmt.version = 0 ;
paf_fmt.samplerate = psf->sf.samplerate ;
switch (psf->sf.pcmbitwidth)
{ case 16 : paf_fmt.format = 0 ;
psf->bytewidth = 2 ;
break ;
case 24 : paf_fmt.format = 1 ;
psf->bytewidth = 3 ;
break ;
default : return SFE_PAF_UNKNOWN_FORMAT ;
} ;
paf_fmt.channels = psf->sf.channels ;
paf_fmt.source = 0 ;
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 = PAF_HEADER_LENGTH ;
psf->datalength = psf->blockwidth * psf->sf.samples ;
psf->filelength = psf->datalength + psf->dataoffset ;
psf->error = 0 ;
switch (paf_fmt.format)
{ case 0 : /* 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 1 : /* 24-bit linear PCM */
psf->write_short = (func_short) paf24_write_s ;
psf->write_int = (func_int) paf24_write_i ;
psf->write_double = (func_double) paf24_write_d ;
if ((error = paf24_writer_init (psf)))
return error ;
psf->seek_func = (func_seek) paf24_seek ;
psf->close = (func_close) paf24_close ;
break ;
default : break ;
} ;
if (big_endian_file)
{ if (CPU_IS_LITTLE_ENDIAN)
endswap_paf_fmt (&paf_fmt) ;
marker = PAF_MARKER ;
}
else
{ if (CPU_IS_BIG_ENDIAN)
endswap_paf_fmt (&paf_fmt) ;
marker = FAP_MARKER ;
} ;
fwrite (&marker, sizeof (marker), 1, psf->file) ;
fwrite (&paf_fmt, sizeof (PAF_FMT), 1, psf->file) ;
/* Fill the file from current position to dataoffset with zero bytes. */
memset (psf->buffer, 0, sizeof (psf->buffer)) ;
count = psf->dataoffset - ftell (psf->file) ;
while (count > 0)
{ int current = (count > sizeof (psf->buffer)) ? sizeof (psf->buffer) : count ;
fwrite (psf->buffer, current, 1, psf->file) ;
count -= current ;
} ;
return 0 ;
} /* paf_open_write */
/*===============================================================================
** 24 bit PAF files have a really weird encoding.
** For a mono file, 10 samples (each being 3 bytes) are packed into a 32 byte
** block. The 8 ints in this 32 byte block are then endian swapped (as ints)
** if necessary before being written to disk.
** For a stereo file, blocks of 10 samples from the same channel are encoded
** into 32 bytes as fro the mono case. The 32 block bytes are then interleaved
** on disk.
** Reading has to reverse the above process :-).
** Weird!!!
**
** The code below attempts to gain efficiency while maintaining readability.
*/
static
int paf24_reader_init (SF_PRIVATE *psf)
{ PAF24_PRIVATE *ppaf24 ;
unsigned int paf24size ;
paf24size = sizeof (PAF24_PRIVATE) + psf->sf.channels * (32 + 10 * sizeof (int)) ;
if (! (psf->fdata = malloc (paf24size)))
return SFE_MALLOC_FAILED ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
memset (ppaf24, 0, paf24size) ;
ppaf24->channels = psf->sf.channels ;
ppaf24->block = (unsigned char*) ppaf24->data ;
ppaf24->samples = (int*) (ppaf24->data + 32 * ppaf24->channels) ;
ppaf24->blocksize = 32 * ppaf24->channels ;
ppaf24->samplesperblock = 10 ;
if (psf->datalength % ppaf24->blocksize)
{ psf_sprintf (psf, "*** Warning : file seems to be truncated.\n") ;
ppaf24->blocks = psf->datalength / ppaf24->blocksize + 1 ;
}
else
ppaf24->blocks = psf->datalength / ppaf24->blocksize ;
psf->sf.samples = ppaf24->samplesperblock * ppaf24->blocks ;
paf24_read_block (psf, ppaf24) ; /* Read first block. */
return 0 ;
} /* paf24_reader_init */
static
int paf24_read_block (SF_PRIVATE *psf, PAF24_PRIVATE *ppaf24)
{ int k, *iptr, newsample, channel ;
unsigned char *cptr ;
ppaf24->blockcount ++ ;
ppaf24->samplecount = 0 ;
if (ppaf24->blockcount > ppaf24->blocks)
{ memset (ppaf24->samples, 0, ppaf24->samplesperblock * ppaf24->channels) ;
return 1 ;
} ;
/* Read the block. */
if ((k = fread (ppaf24->block, 1, ppaf24->blocksize, psf->file)) != ppaf24->blocksize)
psf_sprintf (psf, "*** Warning : short read (%d != %d).\n", k, ppaf24->blocksize) ;
/* Do endian swapping if necessary. */
iptr = (int*) (ppaf24->data) ;
if ((CPU_IS_BIG_ENDIAN && psf->endian == SF_ENDIAN_LITTLE) ||
(CPU_IS_LITTLE_ENDIAN && psf->endian == SF_ENDIAN_BIG))
{ for (k = 0 ; k < 8 * ppaf24->channels ; k++)
iptr [k] = ENDSWAP_INT (iptr [k]) ;
} ;
/* Unpack block. */
for (k = 0 ; k < 10 * ppaf24->channels ; k++)
{ channel = k % ppaf24->channels ;
cptr = ppaf24->block + 32 * channel + 3 * (k / ppaf24->channels) ;
newsample = (cptr [0] << 8) | (cptr [1] << 16) | (cptr [2] << 24) ;
ppaf24->samples [k] = newsample / 256 ;
} ;
return 1 ;
} /* paf24_read_block */
static
int paf24_read (SF_PRIVATE *psf, PAF24_PRIVATE *ppaf24, int *ptr, int len)
{ int count, total = 0, index = 0 ;
while (index < len)
{ if (ppaf24->blockcount >= ppaf24->blocks && ppaf24->samplecount >= ppaf24->samplesperblock)
{ memset (&(ptr[index]), 0, (len - index) * sizeof (int)) ;
return total ;
} ;
if (ppaf24->samplecount >= ppaf24->samplesperblock)
paf24_read_block (psf, ppaf24) ;
count = (ppaf24->samplesperblock - ppaf24->samplecount) * ppaf24->channels ;
count = (len - index > count) ? count : len - index ;
memcpy (&(ptr[index]), &(ppaf24->samples [ppaf24->samplecount * ppaf24->channels]), count * sizeof (int)) ;
index += count ;
ppaf24->samplecount += count / ppaf24->channels ;
total = index ;
} ;
return total ;
} /* paf24_read */
static
int paf24_read_s (SF_PRIVATE *psf, short *ptr, int len)
{ PAF24_PRIVATE *ppaf24 ;
int *iptr ;
int k, bufferlen, readcount = 0, count ;
int index = 0, total = 0 ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
iptr = (int*) psf->buffer ;
bufferlen = psf->sf.channels * ((SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth) / sizeof (int) ;
while (len > 0)
{ readcount = (len >= bufferlen) ? bufferlen : len ;
count = paf24_read (psf, ppaf24, iptr, readcount) ;
for (k = 0 ; k < readcount ; k++)
ptr [index+k] = (short) (iptr [k] / 256) ;
index += readcount ;
total += count ;
len -= readcount ;
} ;
return total ;
} /* paf24_read_s */
static
int paf24_read_i (SF_PRIVATE *psf, int *ptr, int len)
{ PAF24_PRIVATE *ppaf24 ;
int total ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
total = paf24_read (psf, ppaf24, ptr, len) ;
return total ;
} /* paf24_read_i */
static
int paf24_read_d (SF_PRIVATE *psf, double *ptr, int len, int normalize)
{ PAF24_PRIVATE *ppaf24 ;
int *iptr ;
int k, bufferlen, readcount = 0, count ;
int index = 0, total = 0 ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
iptr = (int*) psf->buffer ;
bufferlen = psf->sf.channels * ((SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth) / sizeof (int) ;
while (len > 0)
{ readcount = (len >= bufferlen) ? bufferlen : len ;
count = paf24_read (psf, ppaf24, iptr, readcount) ;
for (k = 0 ; k < readcount ; k++)
ptr [index+k] = (double) (iptr [k]) ;
index += readcount ;
total += count ;
len -= readcount ;
} ;
return total ;
} /* paf24_read_d */
/*---------------------------------------------------------------------------
*/
static
int paf24_writer_init (SF_PRIVATE *psf)
{ PAF24_PRIVATE *ppaf24 ;
unsigned int paf24size ;
paf24size = sizeof (PAF24_PRIVATE) + psf->sf.channels * (32 + 10 * sizeof (int)) ;
if (! (psf->fdata = malloc (paf24size)))
return SFE_MALLOC_FAILED ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
memset (ppaf24, 0, paf24size) ;
ppaf24->channels = psf->sf.channels ;
ppaf24->block = (unsigned char*) ppaf24->data ;
ppaf24->samples = (int*) (ppaf24->data + 32 * ppaf24->channels) ;
ppaf24->blocksize = 32 * ppaf24->channels ;
ppaf24->samplesperblock = 10 ;
if (psf->datalength % ppaf24->blocksize)
{ psf_sprintf (psf, "*** Warning : file seems to be truncated.\n") ;
ppaf24->blocks = psf->datalength / ppaf24->blocksize + 1 ;
}
else
ppaf24->blocks = psf->datalength / ppaf24->blocksize ;
psf->sf.samples = ppaf24->samplesperblock * ppaf24->blocks ;
return 0 ;
} /* paf24_writer_init */
static
int paf24_write_block (SF_PRIVATE *psf, PAF24_PRIVATE *ppaf24)
{ int k, *iptr, nextsample, channel ;
unsigned char *cptr ;
/* First pack block. */
for (k = 0 ; k < 10 * ppaf24->channels ; k++)
{ channel = k % ppaf24->channels ;
cptr = ppaf24->block + 32 * channel + 3 * (k / ppaf24->channels) ;
nextsample = ppaf24->samples [k] ;
cptr [0] = nextsample & 0xFF ;
cptr [1] = (nextsample >> 8) & 0xFF ;
cptr [2] = (nextsample >> 16) & 0xFF ;
} ;
/* Do endian swapping if necessary. */
iptr = (int*) (ppaf24->data) ;
if ((CPU_IS_BIG_ENDIAN && psf->endian == SF_ENDIAN_LITTLE) ||
(CPU_IS_LITTLE_ENDIAN && psf->endian == SF_ENDIAN_BIG))
{ for (k = 0 ; k < 8 * ppaf24->channels ; k++)
iptr [k] = ENDSWAP_INT (iptr [k]) ;
} ;
/* Write block to disk. */
if ((k = fwrite (ppaf24->block, 1, ppaf24->blocksize, psf->file)) != ppaf24->blocksize)
psf_sprintf (psf, "*** Warning : short write (%d != %d).\n", k, ppaf24->blocksize) ;
ppaf24->blockcount ++ ;
ppaf24->samplecount = 0 ;
return 1 ;
} /* paf24_write_block */
static
int paf24_write (SF_PRIVATE *psf, PAF24_PRIVATE *ppaf24, int *ptr, int len)
{ int count, total = 0, index = 0 ;
while (index < len)
{ count = (ppaf24->samplesperblock - ppaf24->samplecount) * ppaf24->channels ;
if (count > len - index)
count = len - index ;
memcpy (&(ppaf24->samples [ppaf24->samplecount * ppaf24->channels]), &(ptr [index]), count * sizeof (int)) ;
index += count ;
ppaf24->samplecount += count / ppaf24->channels ;
total = index ;
if (ppaf24->samplecount >= ppaf24->samplesperblock)
paf24_write_block (psf, ppaf24) ;
} ;
return total ;
} /* paf24_write */
static
int paf24_write_s (SF_PRIVATE *psf, short *ptr, int len)
{ PAF24_PRIVATE *ppaf24 ;
int *iptr ;
int k, bufferlen, writecount = 0, count ;
int index = 0, total = 0 ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
iptr = (int*) psf->buffer ;
bufferlen = psf->sf.channels * ((SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth) / sizeof (int) ;
while (len > 0)
{ writecount = (len >= bufferlen) ? bufferlen : len ;
for (k = 0 ; k < writecount ; k++)
iptr [k] = ((int) ptr [index+k]) * 256 ;
count = paf24_write (psf, ppaf24, iptr, writecount) ;
index += writecount ;
total += count ;
len -= writecount ;
} ;
return total ;
} /* paf24_write_s */
static
int paf24_write_i (SF_PRIVATE *psf, int *ptr, int len)
{ PAF24_PRIVATE *ppaf24 ;
int total = 0 ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
total = paf24_write (psf, ppaf24, ptr, len) ;
return total ;
} /* paf24_write_i */
static
int paf24_write_d (SF_PRIVATE *psf, double *ptr, int len, int normalize)
{ PAF24_PRIVATE *ppaf24 ;
int *iptr ;
int k, bufferlen, writecount = 0, count ;
int index = 0, total = 0 ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
iptr = (int*) psf->buffer ;
bufferlen = psf->sf.channels * ((SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth) / sizeof (int) ;
while (len > 0)
{ writecount = (len >= bufferlen) ? bufferlen : len ;
for (k = 0 ; k < writecount ; k++)
iptr [k] = (int) ptr [index+k] ;
count = paf24_write (psf, ppaf24, iptr, writecount) ;
index += writecount ;
total += count ;
len -= writecount ;
} ;
return total ;
} /* paf24_write_d */
/*---------------------------------------------------------------------------
*/
static
off_t paf24_seek (SF_PRIVATE *psf, off_t offset, int whence)
{ PAF24_PRIVATE *ppaf24 ;
int newblock, newsample ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
if (! (psf->blockwidth && psf->datalength && psf->dataoffset))
{ psf->error = SFE_BAD_SEEK ;
return ((off_t) -1) ;
} ;
switch (whence)
{ case SEEK_SET :
if (offset < 0 || offset > ppaf24->blocks * ppaf24->samplesperblock)
{ psf->error = SFE_BAD_SEEK ;
return ((off_t) -1) ;
} ;
newblock = offset / ppaf24->samplesperblock ;
newsample = offset % ppaf24->samplesperblock ;
break ;
case SEEK_CUR :
if (psf->current + offset < 0 || psf->current + offset > ppaf24->blocks * ppaf24->samplesperblock)
{ psf->error = SFE_BAD_SEEK ;
return ((off_t) -1) ;
} ;
newblock = (psf->current + offset) / ppaf24->samplesperblock ;
newsample = (psf->current + offset) % ppaf24->samplesperblock ;
break ;
case SEEK_END :
if (offset > 0 || ppaf24->samplesperblock * ppaf24->blocks + offset < 0)
{ psf->error = SFE_BAD_SEEK ;
return ((off_t) -1) ;
} ;
newblock = (ppaf24->samplesperblock * ppaf24->blocks + offset) / ppaf24->samplesperblock ;
newsample = (ppaf24->samplesperblock * ppaf24->blocks + offset) % ppaf24->samplesperblock ;
break ;
default :
psf->error = SFE_BAD_SEEK ;
return ((off_t) -1) ;
} ;
if (psf->mode == SF_MODE_READ)
{ fseek (psf->file, (int) (psf->dataoffset + newblock * ppaf24->blocksize), SEEK_SET) ;
ppaf24->blockcount = newblock ;
paf24_read_block (psf, ppaf24) ;
ppaf24->samplecount = newsample ;
}
else
{ /* What to do about write??? */
psf->error = SFE_BAD_SEEK ;
return ((off_t) -1) ;
} ;
psf->current = newblock * ppaf24->samplesperblock + newsample ;
return psf->current ;
} /* paf24_seek */
/*---------------------------------------------------------------------------
*/
static
int paf24_close (SF_PRIVATE *psf)
{ PAF24_PRIVATE *ppaf24 ;
if (! psf->fdata)
return 0 ;
ppaf24 = (PAF24_PRIVATE*) psf->fdata ;
if (psf->mode == SF_MODE_WRITE)
{ if (ppaf24->samplecount && ppaf24->samplecount < ppaf24->samplesperblock)
paf24_write_block (psf, ppaf24) ;
} ;
free (psf->fdata) ;
psf->fdata = NULL ;
return 0 ;
} /* paf24_close */
/*---------------------------------------------------------------------------
*/
static
void endswap_paf_fmt (PAF_FMT *ppaf_fmt)
{ ppaf_fmt->version = ENDSWAP_INT (ppaf_fmt->version) ;
ppaf_fmt->endianness = ENDSWAP_INT (ppaf_fmt->endianness) ;
ppaf_fmt->samplerate = ENDSWAP_INT (ppaf_fmt->samplerate) ;
ppaf_fmt->format = ENDSWAP_INT (ppaf_fmt->format) ;
ppaf_fmt->channels = ENDSWAP_INT (ppaf_fmt->channels) ;
ppaf_fmt->source = ENDSWAP_INT (ppaf_fmt->source) ;
} /* endswap_paf_fmt */