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freeswitch/libs/libsndfile/src/vox_adpcm.c

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/*
** Copyright (C) 2002-2009 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.
*/
/*
** This is the OKI / Dialogic ADPCM encoder/decoder. It converts from
** 12 bit linear sample data to a 4 bit ADPCM.
*/
/*
* Note: some early Dialogic hardware does not always reset the ADPCM encoder
* at the start of each vox file. This can result in clipping and/or DC offset
* problems when it comes to decoding the audio. Whilst little can be done
* about the clipping, a DC offset can be removed by passing the decoded audio
* through a high-pass filter at e.g. 10Hz.
*/
#include "sfconfig.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "sndfile.h"
#include "sfendian.h"
#include "common.h"
#include "ima_oki_adpcm.h"
static sf_count_t vox_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
static sf_count_t vox_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
static sf_count_t vox_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
static sf_count_t vox_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
static sf_count_t vox_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ;
static sf_count_t vox_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ;
static sf_count_t vox_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ;
static sf_count_t vox_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ;
static int vox_read_block (SF_PRIVATE *psf, IMA_OKI_ADPCM *pvox, short *ptr, int len) ;
/*------------------------------------------------------------------------------
*/
static int
codec_close (SF_PRIVATE * psf)
{
IMA_OKI_ADPCM * p = (IMA_OKI_ADPCM *) psf->codec_data ;
if (p->errors)
psf_log_printf (psf, "*** Warning : ADPCM state errors: %d\n", p->errors) ;
return p->errors ;
} /* code_close */
int
vox_adpcm_init (SF_PRIVATE *psf)
{ IMA_OKI_ADPCM *pvox = NULL ;
if (psf->mode == SFM_RDWR)
return SFE_BAD_MODE_RW ;
if (psf->mode == SFM_WRITE && psf->sf.channels != 1)
return SFE_CHANNEL_COUNT ;
if ((pvox = malloc (sizeof (IMA_OKI_ADPCM))) == NULL)
return SFE_MALLOC_FAILED ;
psf->codec_data = (void*) pvox ;
memset (pvox, 0, sizeof (IMA_OKI_ADPCM)) ;
if (psf->mode == SFM_WRITE)
{ psf->write_short = vox_write_s ;
psf->write_int = vox_write_i ;
psf->write_float = vox_write_f ;
psf->write_double = vox_write_d ;
}
else
{ psf_log_printf (psf, "Header-less OKI Dialogic ADPCM encoded file.\n") ;
psf_log_printf (psf, "Setting up for 8kHz, mono, Vox ADPCM.\n") ;
psf->read_short = vox_read_s ;
psf->read_int = vox_read_i ;
psf->read_float = vox_read_f ;
psf->read_double = vox_read_d ;
} ;
/* Standard sample rate chennels etc. */
if (psf->sf.samplerate < 1)
psf->sf.samplerate = 8000 ;
psf->sf.channels = 1 ;
psf->sf.frames = psf->filelength * 2 ;
psf->sf.seekable = SF_FALSE ;
psf->codec_close = codec_close ;
/* Seek back to start of data. */
if (psf_fseek (psf, 0 , SEEK_SET) == -1)
return SFE_BAD_SEEK ;
ima_oki_adpcm_init (pvox, IMA_OKI_ADPCM_TYPE_OKI) ;
return 0 ;
} /* vox_adpcm_init */
/*==============================================================================
*/
static int
vox_read_block (SF_PRIVATE *psf, IMA_OKI_ADPCM *pvox, short *ptr, int len)
{ int indx = 0, k ;
while (indx < len)
{ pvox->code_count = (len - indx > IMA_OKI_ADPCM_PCM_LEN) ? IMA_OKI_ADPCM_CODE_LEN : (len - indx + 1) / 2 ;
if ((k = psf_fread (pvox->codes, 1, pvox->code_count, psf)) != pvox->code_count)
{ if (psf_ftell (psf) != psf->filelength)
psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pvox->code_count) ;
if (k == 0)
break ;
} ;
pvox->code_count = k ;
ima_oki_adpcm_decode_block (pvox) ;
memcpy (&(ptr [indx]), pvox->pcm, pvox->pcm_count * sizeof (short)) ;
indx += pvox->pcm_count ;
} ;
return indx ;
} /* vox_read_block */
static sf_count_t
vox_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
int readcount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
while (len > 0)
{ readcount = (len > 0x10000000) ? 0x10000000 : (int) len ;
count = vox_read_block (psf, pvox, ptr, readcount) ;
total += count ;
len -= count ;
if (count != readcount)
break ;
} ;
return total ;
} /* vox_read_s */
static sf_count_t
vox_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
short *sptr ;
int k, bufferlen, readcount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
sptr = psf->u.sbuf ;
bufferlen = ARRAY_LEN (psf->u.sbuf) ;
while (len > 0)
{ readcount = (len >= bufferlen) ? bufferlen : (int) len ;
count = vox_read_block (psf, pvox, sptr, readcount) ;
for (k = 0 ; k < readcount ; k++)
ptr [total + k] = ((int) sptr [k]) << 16 ;
total += count ;
len -= readcount ;
if (count != readcount)
break ;
} ;
return total ;
} /* vox_read_i */
static sf_count_t
vox_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
short *sptr ;
int k, bufferlen, readcount, count ;
sf_count_t total = 0 ;
float normfact ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
normfact = (psf->norm_float == SF_TRUE) ? 1.0 / ((float) 0x8000) : 1.0 ;
sptr = psf->u.sbuf ;
bufferlen = ARRAY_LEN (psf->u.sbuf) ;
while (len > 0)
{ readcount = (len >= bufferlen) ? bufferlen : (int) len ;
count = vox_read_block (psf, pvox, sptr, readcount) ;
for (k = 0 ; k < readcount ; k++)
ptr [total + k] = normfact * (float) (sptr [k]) ;
total += count ;
len -= readcount ;
if (count != readcount)
break ;
} ;
return total ;
} /* vox_read_f */
static sf_count_t
vox_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
short *sptr ;
int k, bufferlen, readcount, count ;
sf_count_t total = 0 ;
double normfact ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
normfact = (psf->norm_double == SF_TRUE) ? 1.0 / ((double) 0x8000) : 1.0 ;
sptr = psf->u.sbuf ;
bufferlen = ARRAY_LEN (psf->u.sbuf) ;
while (len > 0)
{ readcount = (len >= bufferlen) ? bufferlen : (int) len ;
count = vox_read_block (psf, pvox, sptr, readcount) ;
for (k = 0 ; k < readcount ; k++)
ptr [total + k] = normfact * (double) (sptr [k]) ;
total += count ;
len -= readcount ;
if (count != readcount)
break ;
} ;
return total ;
} /* vox_read_d */
/*------------------------------------------------------------------------------
*/
static int
vox_write_block (SF_PRIVATE *psf, IMA_OKI_ADPCM *pvox, const short *ptr, int len)
{ int indx = 0, k ;
while (indx < len)
{ pvox->pcm_count = (len - indx > IMA_OKI_ADPCM_PCM_LEN) ? IMA_OKI_ADPCM_PCM_LEN : len - indx ;
memcpy (pvox->pcm, &(ptr [indx]), pvox->pcm_count * sizeof (short)) ;
ima_oki_adpcm_encode_block (pvox) ;
if ((k = psf_fwrite (pvox->codes, 1, pvox->code_count, psf)) != pvox->code_count)
psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pvox->code_count) ;
indx += pvox->pcm_count ;
} ;
return indx ;
} /* vox_write_block */
static sf_count_t
vox_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
int writecount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
while (len)
{ writecount = (len > 0x10000000) ? 0x10000000 : (int) len ;
count = vox_write_block (psf, pvox, ptr, writecount) ;
total += count ;
len -= count ;
if (count != writecount)
break ;
} ;
return total ;
} /* vox_write_s */
static sf_count_t
vox_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
short *sptr ;
int k, bufferlen, writecount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
sptr = psf->u.sbuf ;
bufferlen = ARRAY_LEN (psf->u.sbuf) ;
while (len > 0)
{ writecount = (len >= bufferlen) ? bufferlen : (int) len ;
for (k = 0 ; k < writecount ; k++)
sptr [k] = ptr [total + k] >> 16 ;
count = vox_write_block (psf, pvox, sptr, writecount) ;
total += count ;
len -= writecount ;
if (count != writecount)
break ;
} ;
return total ;
} /* vox_write_i */
static sf_count_t
vox_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
short *sptr ;
int k, bufferlen, writecount, count ;
sf_count_t total = 0 ;
float normfact ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
normfact = (psf->norm_float == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ;
sptr = psf->u.sbuf ;
bufferlen = ARRAY_LEN (psf->u.sbuf) ;
while (len > 0)
{ writecount = (len >= bufferlen) ? bufferlen : (int) len ;
for (k = 0 ; k < writecount ; k++)
sptr [k] = lrintf (normfact * ptr [total + k]) ;
count = vox_write_block (psf, pvox, sptr, writecount) ;
total += count ;
len -= writecount ;
if (count != writecount)
break ;
} ;
return total ;
} /* vox_write_f */
static sf_count_t
vox_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len)
{ IMA_OKI_ADPCM *pvox ;
short *sptr ;
int k, bufferlen, writecount, count ;
sf_count_t total = 0 ;
double normfact ;
if (! psf->codec_data)
return 0 ;
pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
normfact = (psf->norm_double == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ;
sptr = psf->u.sbuf ;
bufferlen = ARRAY_LEN (psf->u.sbuf) ;
while (len > 0)
{ writecount = (len >= bufferlen) ? bufferlen : (int) len ;
for (k = 0 ; k < writecount ; k++)
sptr [k] = lrint (normfact * ptr [total + k]) ;
count = vox_write_block (psf, pvox, sptr, writecount) ;
total += count ;
len -= writecount ;
if (count != writecount)
break ;
} ;
return total ;
} /* vox_write_d */
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