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freeswitch/libs/libsndfile/src/interleave.c

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/*
** Copyright (C) 2002-2004 Erik de Castro Lopo <erikd@mega-nerd.com>
**
** 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 "sfendian.h"
#include <stdlib.h>
#include "sndfile.h"
#include "common.h"
#define INTERLEAVE_CHANNELS 6
typedef struct
{ double buffer [SF_BUFFER_LEN / sizeof (double)] ;
sf_count_t channel_len ;
sf_count_t (*read_short) (SF_PRIVATE*, short *ptr, sf_count_t len) ;
sf_count_t (*read_int) (SF_PRIVATE*, int *ptr, sf_count_t len) ;
sf_count_t (*read_float) (SF_PRIVATE*, float *ptr, sf_count_t len) ;
sf_count_t (*read_double) (SF_PRIVATE*, double *ptr, sf_count_t len) ;
} INTERLEAVE_DATA ;
static sf_count_t interleave_read_short (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
static sf_count_t interleave_read_int (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
static sf_count_t interleave_read_float (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
static sf_count_t interleave_read_double (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
static sf_count_t interleave_seek (SF_PRIVATE*, int mode, sf_count_t samples_from_start) ;
int
interleave_init (SF_PRIVATE *psf)
{ INTERLEAVE_DATA *pdata ;
if (psf->mode != SFM_READ)
return SFE_INTERLEAVE_MODE ;
if (psf->interleave)
{ psf_log_printf (psf, "*** Weird, already have interleave.\n") ;
return 666 ;
} ;
/* Free this in sf_close() function. */
if (! (pdata = malloc (sizeof (INTERLEAVE_DATA))))
return SFE_MALLOC_FAILED ;
puts ("interleave_init") ;
psf->interleave = pdata ;
/* Save the existing methods. */
pdata->read_short = psf->read_short ;
pdata->read_int = psf->read_int ;
pdata->read_float = psf->read_float ;
pdata->read_double = psf->read_double ;
pdata->channel_len = psf->sf.frames * psf->bytewidth ;
/* Insert our new methods. */
psf->read_short = interleave_read_short ;
psf->read_int = interleave_read_int ;
psf->read_float = interleave_read_float ;
psf->read_double = interleave_read_double ;
psf->seek = interleave_seek ;
return 0 ;
} /* pcm_interleave_init */
/*------------------------------------------------------------------------------
*/
static sf_count_t
interleave_read_short (SF_PRIVATE *psf, short *ptr, sf_count_t len)
{ INTERLEAVE_DATA *pdata ;
sf_count_t offset, templen ;
int chan, count, k ;
short *inptr, *outptr ;
if (! (pdata = psf->interleave))
return 0 ;
inptr = (short*) pdata->buffer ;
for (chan = 0 ; chan < psf->sf.channels ; chan++)
{ outptr = ptr + chan ;
offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
if (psf_fseek (psf, offset, SEEK_SET) != offset)
{ psf->error = SFE_INTERLEAVE_SEEK ;
return 0 ;
} ;
templen = len / psf->sf.channels ;
while (templen > 0)
{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (short))
count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (short) ;
else
count = (int) templen ;
if (pdata->read_short (psf, inptr, count) != count)
{ psf->error = SFE_INTERLEAVE_READ ;
return 0 ;
} ;
for (k = 0 ; k < count ; k++)
{ *outptr = inptr [k] ;
outptr += psf->sf.channels ;
} ;
templen -= count ;
} ;
} ;
return len ;
} /* interleave_read_short */
static sf_count_t
interleave_read_int (SF_PRIVATE *psf, int *ptr, sf_count_t len)
{ INTERLEAVE_DATA *pdata ;
sf_count_t offset, templen ;
int chan, count, k ;
int *inptr, *outptr ;
if (! (pdata = psf->interleave))
return 0 ;
inptr = (int*) pdata->buffer ;
for (chan = 0 ; chan < psf->sf.channels ; chan++)
{ outptr = ptr + chan ;
offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
if (psf_fseek (psf, offset, SEEK_SET) != offset)
{ psf->error = SFE_INTERLEAVE_SEEK ;
return 0 ;
} ;
templen = len / psf->sf.channels ;
while (templen > 0)
{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (int))
count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (int) ;
else
count = (int) templen ;
if (pdata->read_int (psf, inptr, count) != count)
{ psf->error = SFE_INTERLEAVE_READ ;
return 0 ;
} ;
for (k = 0 ; k < count ; k++)
{ *outptr = inptr [k] ;
outptr += psf->sf.channels ;
} ;
templen -= count ;
} ;
} ;
return len ;
} /* interleave_read_int */
static sf_count_t
interleave_read_float (SF_PRIVATE *psf, float *ptr, sf_count_t len)
{ INTERLEAVE_DATA *pdata ;
sf_count_t offset, templen ;
int chan, count, k ;
float *inptr, *outptr ;
if (! (pdata = psf->interleave))
return 0 ;
inptr = (float*) pdata->buffer ;
for (chan = 0 ; chan < psf->sf.channels ; chan++)
{ outptr = ptr + chan ;
offset = psf->dataoffset + pdata->channel_len * chan + psf->read_current * psf->bytewidth ;
/*-printf ("chan : %d read_current : %6lld offset : %6lld\n", chan, psf->read_current, offset) ;-*/
if (psf_fseek (psf, offset, SEEK_SET) != offset)
{ psf->error = SFE_INTERLEAVE_SEEK ;
/*-puts ("interleave_seek error") ; exit (1) ;-*/
return 0 ;
} ;
templen = len / psf->sf.channels ;
while (templen > 0)
{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (float))
count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (float) ;
else
count = (int) templen ;
if (pdata->read_float (psf, inptr, count) != count)
{ psf->error = SFE_INTERLEAVE_READ ;
/*-puts ("interleave_read error") ; exit (1) ;-*/
return 0 ;
} ;
for (k = 0 ; k < count ; k++)
{ *outptr = inptr [k] ;
outptr += psf->sf.channels ;
} ;
templen -= count ;
} ;
} ;
return len ;
} /* interleave_read_float */
static sf_count_t
interleave_read_double (SF_PRIVATE *psf, double *ptr, sf_count_t len)
{ INTERLEAVE_DATA *pdata ;
sf_count_t offset, templen ;
int chan, count, k ;
double *inptr, *outptr ;
if (! (pdata = psf->interleave))
return 0 ;
inptr = (double*) pdata->buffer ;
for (chan = 0 ; chan < psf->sf.channels ; chan++)
{ outptr = ptr + chan ;
offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
if (psf_fseek (psf, offset, SEEK_SET) != offset)
{ psf->error = SFE_INTERLEAVE_SEEK ;
return 0 ;
} ;
templen = len / psf->sf.channels ;
while (templen > 0)
{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (double))
count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (double) ;
else
count = (int) templen ;
if (pdata->read_double (psf, inptr, count) != count)
{ psf->error = SFE_INTERLEAVE_READ ;
return 0 ;
} ;
for (k = 0 ; k < count ; k++)
{ *outptr = inptr [k] ;
outptr += psf->sf.channels ;
} ;
templen -= count ;
} ;
} ;
return len ;
} /* interleave_read_double */
/*------------------------------------------------------------------------------
*/
static sf_count_t
interleave_seek (SF_PRIVATE *psf, int mode, sf_count_t samples_from_start)
{ psf = psf ; mode = mode ;
/*
** Do nothing here. This is a place holder to prevent the default
** seek function from being called.
*/
return samples_from_start ;
} /* interleave_seek */
/*
** Do not edit or modify anything in this comment block.
** The arch-tag line is a file identity tag for the GNU Arch
** revision control system.
**
** arch-tag: 82314e13-0225-4408-a2f2-e6dab3f38904
*/
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