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freeswitch/libs/libsndfile/src/ima_adpcm.c

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/*
** Copyright (C) 1999-2009 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.
*/
#include "sfconfig.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "sndfile.h"
#include "sfendian.h"
#include "common.h"
typedef struct IMA_ADPCM_PRIVATE_tag
{ int (*decode_block) (SF_PRIVATE *psf, struct IMA_ADPCM_PRIVATE_tag *pima) ;
int (*encode_block) (SF_PRIVATE *psf, struct IMA_ADPCM_PRIVATE_tag *pima) ;
int channels, blocksize, samplesperblock, blocks ;
int blockcount, samplecount ;
int previous [2] ;
int stepindx [2] ;
unsigned char *block ;
short *samples ;
#if HAVE_FLEXIBLE_ARRAY
short data [] ; /* ISO C99 struct flexible array. */
#else
short data [0] ; /* This is a hack and might not work. */
#endif
} IMA_ADPCM_PRIVATE ;
/*============================================================================================
** Predefined IMA ADPCM data.
*/
static int ima_indx_adjust [16] =
{ -1, -1, -1, -1, /* +0 - +3, decrease the step size */
2, 4, 6, 8, /* +4 - +7, increase the step size */
-1, -1, -1, -1, /* -0 - -3, decrease the step size */
2, 4, 6, 8, /* -4 - -7, increase the step size */
} ;
static int ima_step_size [89] =
{ 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230,
253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963,
1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327,
3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442,
11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
32767
} ;
static int ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) ;
static int ima_writer_init (SF_PRIVATE *psf, int blockalign) ;
static int ima_read_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, short *ptr, int len) ;
static int ima_write_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, const short *ptr, int len) ;
static sf_count_t ima_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
static sf_count_t ima_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
static sf_count_t ima_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
static sf_count_t ima_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
static sf_count_t ima_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ;
static sf_count_t ima_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ;
static sf_count_t ima_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ;
static sf_count_t ima_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ;
static sf_count_t ima_seek (SF_PRIVATE *psf, int mode, sf_count_t offset) ;
static int ima_close (SF_PRIVATE *psf) ;
static int wav_w64_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
static int wav_w64_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
/*-static int aiff_ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) ;-*/
static int aiff_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
static int aiff_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
static inline int
clamp_ima_step_index (int indx)
{ if (indx < 0)
return 0 ;
if (indx >= ARRAY_LEN (ima_step_size))
return ARRAY_LEN (ima_step_size) - 1 ;
return indx ;
} /* clamp_ima_step_index */
/*============================================================================================
** IMA ADPCM Reader initialisation function.
*/
int
wav_w64_ima_init (SF_PRIVATE *psf, int blockalign, int samplesperblock)
{ int error ;
if (psf->codec_data != NULL)
{ psf_log_printf (psf, "*** psf->codec_data is not NULL.\n") ;
return SFE_INTERNAL ;
} ;
if (psf->mode == SFM_RDWR)
return SFE_BAD_MODE_RW ;
if (psf->mode == SFM_READ)
if ((error = ima_reader_init (psf, blockalign, samplesperblock)))
return error ;
if (psf->mode == SFM_WRITE)
if ((error = ima_writer_init (psf, blockalign)))
return error ;
psf->codec_close = ima_close ;
psf->seek = ima_seek ;
return 0 ;
} /* wav_w64_ima_init */
int
aiff_ima_init (SF_PRIVATE *psf, int blockalign, int samplesperblock)
{ int error ;
if (psf->mode == SFM_RDWR)
return SFE_BAD_MODE_RW ;
if (psf->mode == SFM_READ)
if ((error = ima_reader_init (psf, blockalign, samplesperblock)))
return error ;
if (psf->mode == SFM_WRITE)
if ((error = ima_writer_init (psf, blockalign)))
return error ;
psf->codec_close = ima_close ;
return 0 ;
} /* aiff_ima_init */
static int
ima_close (SF_PRIVATE *psf)
{ IMA_ADPCM_PRIVATE *pima ;
pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
if (psf->mode == SFM_WRITE)
{ /* If a block has been partially assembled, write it out
** as the final block.
*/
if (pima->samplecount && pima->samplecount < pima->samplesperblock)
pima->encode_block (psf, pima) ;
psf->sf.frames = pima->samplesperblock * pima->blockcount / psf->sf.channels ;
} ;
return 0 ;
} /* ima_close */
/*============================================================================================
** IMA ADPCM Read Functions.
*/
static int
ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock)
{ IMA_ADPCM_PRIVATE *pima ;
int pimasize, count ;
if (psf->mode != SFM_READ)
return SFE_BAD_MODE_RW ;
pimasize = sizeof (IMA_ADPCM_PRIVATE) + blockalign * psf->sf.channels + 3 * psf->sf.channels * samplesperblock ;
if (! (pima = malloc (pimasize)))
return SFE_MALLOC_FAILED ;
psf->codec_data = (void*) pima ;
memset (pima, 0, pimasize) ;
pima->samples = pima->data ;
pima->block = (unsigned char*) (pima->data + samplesperblock * psf->sf.channels) ;
pima->channels = psf->sf.channels ;
pima->blocksize = blockalign ;
pima->samplesperblock = samplesperblock ;
psf->filelength = psf_get_filelen (psf) ;
psf->datalength = (psf->dataend) ? psf->dataend - psf->dataoffset :
psf->filelength - psf->dataoffset ;
if (pima->blocksize == 0)
{ psf_log_printf (psf, "*** Error : pima->blocksize should not be zero.\n") ;
return SFE_INTERNAL ;
} ;
if (psf->datalength % pima->blocksize)
pima->blocks = psf->datalength / pima->blocksize + 1 ;
else
pima->blocks = psf->datalength / pima->blocksize ;
switch (SF_CONTAINER (psf->sf.format))
{ case SF_FORMAT_WAV :
case SF_FORMAT_W64 :
count = 2 * (pima->blocksize - 4 * pima->channels) / pima->channels + 1 ;
if (pima->samplesperblock != count)
{ psf_log_printf (psf, "*** Error : samplesperblock should be %d.\n", count) ;
return SFE_INTERNAL ;
} ;
pima->decode_block = wav_w64_ima_decode_block ;
psf->sf.frames = pima->samplesperblock * pima->blocks ;
break ;
case SF_FORMAT_AIFF :
psf_log_printf (psf, "still need to check block count\n") ;
pima->decode_block = aiff_ima_decode_block ;
psf->sf.frames = pima->samplesperblock * pima->blocks / pima->channels ;
break ;
default :
psf_log_printf (psf, "ima_reader_init: bad psf->sf.format\n") ;
return SFE_INTERNAL ;
break ;
} ;
pima->decode_block (psf, pima) ; /* Read first block. */
psf->read_short = ima_read_s ;
psf->read_int = ima_read_i ;
psf->read_float = ima_read_f ;
psf->read_double = ima_read_d ;
return 0 ;
} /* ima_reader_init */
static int
aiff_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
{ unsigned char *blockdata ;
int chan, k, diff, bytecode ;
short step, stepindx, predictor, *sampledata ;
static int count = 0 ;
count ++ ;
pima->blockcount += pima->channels ;
pima->samplecount = 0 ;
if (pima->blockcount > pima->blocks)
{ memset (pima->samples, 0, pima->samplesperblock * pima->channels * sizeof (short)) ;
return 1 ;
} ;
if ((k = psf_fread (pima->block, 1, pima->blocksize * pima->channels, psf)) != pima->blocksize * pima->channels)
psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pima->blocksize) ;
/* Read and check the block header. */
for (chan = 0 ; chan < pima->channels ; chan++)
{ blockdata = pima->block + chan * 34 ;
sampledata = pima->samples + chan ;
predictor = (blockdata [0] << 8) | (blockdata [1] & 0x80) ;
stepindx = blockdata [1] & 0x7F ;
stepindx = clamp_ima_step_index (stepindx) ;
/*
** Pull apart the packed 4 bit samples and store them in their
** correct sample positions.
*/
for (k = 0 ; k < pima->blocksize - 2 ; k++)
{ bytecode = blockdata [k + 2] ;
sampledata [pima->channels * (2 * k + 0)] = bytecode & 0xF ;
sampledata [pima->channels * (2 * k + 1)] = (bytecode >> 4) & 0xF ;
} ;
/* Decode the encoded 4 bit samples. */
for (k = 0 ; k < pima->samplesperblock ; k ++)
{ step = ima_step_size [stepindx] ;
bytecode = pima->samples [pima->channels * k + chan] ;
stepindx += ima_indx_adjust [bytecode] ;
stepindx = clamp_ima_step_index (stepindx) ;
diff = step >> 3 ;
if (bytecode & 1) diff += step >> 2 ;
if (bytecode & 2) diff += step >> 1 ;
if (bytecode & 4) diff += step ;
if (bytecode & 8) diff = -diff ;
predictor += diff ;
pima->samples [pima->channels * k + chan] = predictor ;
} ;
} ;
return 1 ;
} /* aiff_ima_decode_block */
static int
aiff_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
{ int chan, k, step, diff, vpdiff, blockindx, indx ;
short bytecode, mask ;
/* Encode the block header. */
for (chan = 0 ; chan < pima->channels ; chan ++)
{ blockindx = chan * pima->blocksize ;
pima->block [blockindx] = (pima->samples [chan] >> 8) & 0xFF ;
pima->block [blockindx + 1] = (pima->samples [chan] & 0x80) + (pima->stepindx [chan] & 0x7F) ;
pima->previous [chan] = pima->samples [chan] ;
} ;
/* Encode second and later samples for every block as a 4 bit value. */
for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++)
{ chan = (pima->channels > 1) ? (k % 2) : 0 ;
diff = pima->samples [k] - pima->previous [chan] ;
bytecode = 0 ;
step = ima_step_size [pima->stepindx [chan]] ;
vpdiff = step >> 3 ;
if (diff < 0)
{ bytecode = 8 ;
diff = -diff ;
} ;
mask = 4 ;
while (mask)
{ if (diff >= step)
{ bytecode |= mask ;
diff -= step ;
vpdiff += step ;
} ;
step >>= 1 ;
mask >>= 1 ;
} ;
if (bytecode & 8)
pima->previous [chan] -= vpdiff ;
else
pima->previous [chan] += vpdiff ;
if (pima->previous [chan] > 32767)
pima->previous [chan] = 32767 ;
else if (pima->previous [chan] < -32768)
pima->previous [chan] = -32768 ;
pima->stepindx [chan] += ima_indx_adjust [bytecode] ;
pima->stepindx [chan] = clamp_ima_step_index (pima->stepindx [chan]) ;
pima->samples [k] = bytecode ;
} ;
/* Pack the 4 bit encoded samples. */
for (chan = 0 ; chan < pima->channels ; chan ++)
{ for (indx = pima->channels ; indx < pima->channels * pima->samplesperblock ; indx += 2 * pima->channels)
{ blockindx = chan * pima->blocksize + 2 + indx / 2 ;
pima->block [blockindx] = pima->samples [indx] & 0x0F ;
pima->block [blockindx] |= (pima->samples [indx + pima->channels] << 4) & 0xF0 ;
} ;
} ;
/* Write the block to disk. */
if ((k = psf_fwrite (pima->block, 1, pima->channels * pima->blocksize, psf)) != pima->channels * pima->blocksize)
psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pima->channels * pima->blocksize) ;
memset (pima->samples, 0, pima->channels * pima->samplesperblock * sizeof (short)) ;
pima->samplecount = 0 ;
pima->blockcount ++ ;
return 1 ;
} /* aiff_ima_encode_block */
static int
wav_w64_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
{ int chan, k, current, blockindx, indx, indxstart, diff ;
short step, bytecode, stepindx [2] ;
pima->blockcount ++ ;
pima->samplecount = 0 ;
if (pima->blockcount > pima->blocks)
{ memset (pima->samples, 0, pima->samplesperblock * pima->channels * sizeof (short)) ;
return 1 ;
} ;
if ((k = psf_fread (pima->block, 1, pima->blocksize, psf)) != pima->blocksize)
psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pima->blocksize) ;
/* Read and check the block header. */
for (chan = 0 ; chan < pima->channels ; chan++)
{ current = pima->block [chan*4] | (pima->block [chan*4+1] << 8) ;
if (current & 0x8000)
current -= 0x10000 ;
stepindx [chan] = pima->block [chan*4+2] ;
stepindx [chan] = clamp_ima_step_index (stepindx [chan]) ;
if (pima->block [chan*4+3] != 0)
psf_log_printf (psf, "IMA ADPCM synchronisation error.\n") ;
pima->samples [chan] = current ;
} ;
/*
** Pull apart the packed 4 bit samples and store them in their
** correct sample positions.
*/
blockindx = 4 * pima->channels ;
indxstart = pima->channels ;
while (blockindx < pima->blocksize)
{ for (chan = 0 ; chan < pima->channels ; chan++)
{ indx = indxstart + chan ;
for (k = 0 ; k < 4 ; k++)
{ bytecode = pima->block [blockindx++] ;
pima->samples [indx] = bytecode & 0x0F ;
indx += pima->channels ;
pima->samples [indx] = (bytecode >> 4) & 0x0F ;
indx += pima->channels ;
} ;
} ;
indxstart += 8 * pima->channels ;
} ;
/* Decode the encoded 4 bit samples. */
for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++)
{ chan = (pima->channels > 1) ? (k % 2) : 0 ;
bytecode = pima->samples [k] & 0xF ;
step = ima_step_size [stepindx [chan]] ;
current = pima->samples [k - pima->channels] ;
diff = step >> 3 ;
if (bytecode & 1)
diff += step >> 2 ;
if (bytecode & 2)
diff += step >> 1 ;
if (bytecode & 4)
diff += step ;
if (bytecode & 8)
diff = -diff ;
current += diff ;
if (current > 32767)
current = 32767 ;
else if (current < -32768)
current = -32768 ;
stepindx [chan] += ima_indx_adjust [bytecode] ;
stepindx [chan] = clamp_ima_step_index (stepindx [chan]) ;
pima->samples [k] = current ;
} ;
return 1 ;
} /* wav_w64_ima_decode_block */
static int
wav_w64_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
{ int chan, k, step, diff, vpdiff, blockindx, indx, indxstart ;
short bytecode, mask ;
/* Encode the block header. */
for (chan = 0 ; chan < pima->channels ; chan++)
{ pima->block [chan*4] = pima->samples [chan] & 0xFF ;
pima->block [chan*4+1] = (pima->samples [chan] >> 8) & 0xFF ;
pima->block [chan*4+2] = pima->stepindx [chan] ;
pima->block [chan*4+3] = 0 ;
pima->previous [chan] = pima->samples [chan] ;
} ;
/* Encode the samples as 4 bit. */
for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++)
{ chan = (pima->channels > 1) ? (k % 2) : 0 ;
diff = pima->samples [k] - pima->previous [chan] ;
bytecode = 0 ;
step = ima_step_size [pima->stepindx [chan]] ;
vpdiff = step >> 3 ;
if (diff < 0)
{ bytecode = 8 ;
diff = -diff ;
} ;
mask = 4 ;
while (mask)
{ if (diff >= step)
{ bytecode |= mask ;
diff -= step ;
vpdiff += step ;
} ;
step >>= 1 ;
mask >>= 1 ;
} ;
if (bytecode & 8)
pima->previous [chan] -= vpdiff ;
else
pima->previous [chan] += vpdiff ;
if (pima->previous [chan] > 32767)
pima->previous [chan] = 32767 ;
else if (pima->previous [chan] < -32768)
pima->previous [chan] = -32768 ;
pima->stepindx [chan] += ima_indx_adjust [bytecode] ;
pima->stepindx [chan] = clamp_ima_step_index (pima->stepindx [chan]) ;
pima->samples [k] = bytecode ;
} ;
/* Pack the 4 bit encoded samples. */
blockindx = 4 * pima->channels ;
indxstart = pima->channels ;
while (blockindx < pima->blocksize)
{ for (chan = 0 ; chan < pima->channels ; chan++)
{ indx = indxstart + chan ;
for (k = 0 ; k < 4 ; k++)
{ pima->block [blockindx] = pima->samples [indx] & 0x0F ;
indx += pima->channels ;
pima->block [blockindx] |= (pima->samples [indx] << 4) & 0xF0 ;
indx += pima->channels ;
blockindx ++ ;
} ;
} ;
indxstart += 8 * pima->channels ;
} ;
/* Write the block to disk. */
if ((k = psf_fwrite (pima->block, 1, pima->blocksize, psf)) != pima->blocksize)
psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pima->blocksize) ;
memset (pima->samples, 0, pima->samplesperblock * sizeof (short)) ;
pima->samplecount = 0 ;
pima->blockcount ++ ;
return 1 ;
} /* wav_w64_ima_encode_block */
static int
ima_read_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, short *ptr, int len)
{ int count, total = 0, indx = 0 ;
while (indx < len)
{ if (pima->blockcount >= pima->blocks && pima->samplecount >= pima->samplesperblock)
{ memset (&(ptr [indx]), 0, (size_t) ((len - indx) * sizeof (short))) ;
return total ;
} ;
if (pima->samplecount >= pima->samplesperblock)
pima->decode_block (psf, pima) ;
count = (pima->samplesperblock - pima->samplecount) * pima->channels ;
count = (len - indx > count) ? count : len - indx ;
memcpy (&(ptr [indx]), &(pima->samples [pima->samplecount * pima->channels]), count * sizeof (short)) ;
indx += count ;
pima->samplecount += count / pima->channels ;
total = indx ;
} ;
return total ;
} /* ima_read_block */
static sf_count_t
ima_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
int readcount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
while (len > 0)
{ readcount = (len > 0x10000000) ? 0x10000000 : (int) len ;
count = ima_read_block (psf, pima, ptr, readcount) ;
total += count ;
len -= count ;
if (count != readcount)
break ;
} ;
return total ;
} /* ima_read_s */
static sf_count_t
ima_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
short *sptr ;
int k, bufferlen, readcount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
sptr = psf->u.sbuf ;
bufferlen = ARRAY_LEN (psf->u.sbuf) ;
while (len > 0)
{ readcount = (len >= bufferlen) ? bufferlen : (int) len ;
count = ima_read_block (psf, pima, 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 ;
} /* ima_read_i */
static sf_count_t
ima_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
short *sptr ;
int k, bufferlen, readcount, count ;
sf_count_t total = 0 ;
float normfact ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) 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 = ima_read_block (psf, pima, 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 ;
} /* ima_read_f */
static sf_count_t
ima_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
short *sptr ;
int k, bufferlen, readcount, count ;
sf_count_t total = 0 ;
double normfact ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) 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 = ima_read_block (psf, pima, 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 ;
} /* ima_read_d */
static sf_count_t
ima_seek (SF_PRIVATE *psf, int mode, sf_count_t offset)
{ IMA_ADPCM_PRIVATE *pima ;
int newblock, newsample ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
if (psf->datalength < 0 || psf->dataoffset < 0)
{ psf->error = SFE_BAD_SEEK ;
return PSF_SEEK_ERROR ;
} ;
if (offset == 0)
{ psf_fseek (psf, psf->dataoffset, SEEK_SET) ;
pima->blockcount = 0 ;
pima->decode_block (psf, pima) ;
pima->samplecount = 0 ;
return 0 ;
} ;
if (offset < 0 || offset > pima->blocks * pima->samplesperblock)
{ psf->error = SFE_BAD_SEEK ;
return PSF_SEEK_ERROR ;
} ;
newblock = offset / pima->samplesperblock ;
newsample = offset % pima->samplesperblock ;
if (mode == SFM_READ)
{ psf_fseek (psf, psf->dataoffset + newblock * pima->blocksize, SEEK_SET) ;
pima->blockcount = newblock ;
pima->decode_block (psf, pima) ;
pima->samplecount = newsample ;
}
else
{ /* What to do about write??? */
psf->error = SFE_BAD_SEEK ;
return PSF_SEEK_ERROR ;
} ;
return newblock * pima->samplesperblock + newsample ;
} /* ima_seek */
/*==========================================================================================
** IMA ADPCM Write Functions.
*/
static int
ima_writer_init (SF_PRIVATE *psf, int blockalign)
{ IMA_ADPCM_PRIVATE *pima ;
int samplesperblock ;
unsigned int pimasize ;
if (psf->mode != SFM_WRITE)
return SFE_BAD_MODE_RW ;
samplesperblock = 2 * (blockalign - 4 * psf->sf.channels) / psf->sf.channels + 1 ;
pimasize = sizeof (IMA_ADPCM_PRIVATE) + blockalign + 3 * psf->sf.channels * samplesperblock ;
if ((pima = calloc (1, pimasize)) == NULL)
return SFE_MALLOC_FAILED ;
psf->codec_data = (void*) pima ;
pima->channels = psf->sf.channels ;
pima->blocksize = blockalign ;
pima->samplesperblock = samplesperblock ;
pima->block = (unsigned char*) pima->data ;
pima->samples = (short*) (pima->data + blockalign) ;
pima->samplecount = 0 ;
switch (SF_CONTAINER (psf->sf.format))
{ case SF_FORMAT_WAV :
case SF_FORMAT_W64 :
pima->encode_block = wav_w64_ima_encode_block ;
break ;
case SF_FORMAT_AIFF :
pima->encode_block = aiff_ima_encode_block ;
break ;
default :
psf_log_printf (psf, "ima_reader_init: bad psf->sf.format\n") ;
return SFE_INTERNAL ;
break ;
} ;
psf->write_short = ima_write_s ;
psf->write_int = ima_write_i ;
psf->write_float = ima_write_f ;
psf->write_double = ima_write_d ;
return 0 ;
} /* ima_writer_init */
/*==========================================================================================
*/
static int
ima_write_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, const short *ptr, int len)
{ int count, total = 0, indx = 0 ;
while (indx < len)
{ count = (pima->samplesperblock - pima->samplecount) * pima->channels ;
if (count > len - indx)
count = len - indx ;
memcpy (&(pima->samples [pima->samplecount * pima->channels]), &(ptr [total]), count * sizeof (short)) ;
indx += count ;
pima->samplecount += count / pima->channels ;
total = indx ;
if (pima->samplecount >= pima->samplesperblock)
pima->encode_block (psf, pima) ;
} ;
return total ;
} /* ima_write_block */
static sf_count_t
ima_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
int writecount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
while (len)
{ writecount = (len > 0x10000000) ? 0x10000000 : (int) len ;
count = ima_write_block (psf, pima, ptr, writecount) ;
total += count ;
len -= count ;
if (count != writecount)
break ;
} ;
return total ;
} /* ima_write_s */
static sf_count_t
ima_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
short *sptr ;
int k, bufferlen, writecount, count ;
sf_count_t total = 0 ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) 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 = ima_write_block (psf, pima, sptr, writecount) ;
total += count ;
len -= writecount ;
if (count != writecount)
break ;
} ;
return total ;
} /* ima_write_i */
static sf_count_t
ima_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
short *sptr ;
int k, bufferlen, writecount, count ;
sf_count_t total = 0 ;
float normfact ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) 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 = ima_write_block (psf, pima, sptr, writecount) ;
total += count ;
len -= writecount ;
if (count != writecount)
break ;
} ;
return total ;
} /* ima_write_f */
static sf_count_t
ima_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len)
{ IMA_ADPCM_PRIVATE *pima ;
short *sptr ;
int k, bufferlen, writecount, count ;
sf_count_t total = 0 ;
double normfact ;
if (! psf->codec_data)
return 0 ;
pima = (IMA_ADPCM_PRIVATE*) 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 = ima_write_block (psf, pima, sptr, writecount) ;
total += count ;
len -= writecount ;
if (count != writecount)
break ;
} ;
return total ;
} /* ima_write_d */
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