diff options
Diffstat (limited to 'libs/libsndfile/src/ima_adpcm.c')
| -rw-r--r-- | libs/libsndfile/src/ima_adpcm.c | 976 |
1 files changed, 0 insertions, 976 deletions
diff --git a/libs/libsndfile/src/ima_adpcm.c b/libs/libsndfile/src/ima_adpcm.c deleted file mode 100644 index abc49e5774..0000000000 --- a/libs/libsndfile/src/ima_adpcm.c +++ /dev/null @@ -1,976 +0,0 @@ -/* -** Copyright (C) 1999-2005 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 "sndfile.h" -#include "sfendian.h" -#include "float_cast.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) ; - - -/*============================================================================================ -** IMA ADPCM Reader initialisation function. -*/ - -int -wav_w64_ima_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) -{ int error ; - - if (psf->fdata != NULL) - { psf_log_printf (psf, "*** psf->fdata 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->fdata ; - - 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->fdata = (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 (psf->datalength % pima->blocksize) - pima->blocks = psf->datalength / pima->blocksize + 1 ; - else - pima->blocks = psf->datalength / pima->blocksize ; - - switch (psf->sf.format & SF_FORMAT_TYPEMASK) - { 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, "*** Warning : samplesperblock should be %d.\n", count) ; - - 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 ; - -{ -if (count < 5) -printf ("\nchan: %d predictor: %d stepindx: %d (%d)\n", - chan, predictor, stepindx, ima_step_size [stepindx]) ; -} - /* FIXME : Do this a better way. */ - if (stepindx < 0) stepindx = 0 ; - else if (stepindx > 88) stepindx = 88 ; - - /* - ** 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] ; - - if (stepindx < 0) stepindx = 0 ; - else if (stepindx > 88) stepindx = 88 ; - - 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 ; - } ; - } ; - -if (count < 5) -{ - for (k = 0 ; k < 10 ; k++) - printf ("% 7d,", pima->samples [k]) ; - puts ("") ; -} - - 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 ; - -static int count = 0 ; -if (0 && count == 0) -{ pima->samples [0] = 0 ; - printf ("blocksize : %d\n", pima->blocksize) ; - printf ("pima->stepindx [0] : %d\n", pima->stepindx [0]) ; - } -count ++ ; - - /* 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] ; - if (pima->stepindx [chan] < 0) - pima->stepindx [chan] = 0 ; - else if (pima->stepindx [chan] > 88) - pima->stepindx [chan] = 88 ; - - 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 ; - -if (0 && count ++ < 5) - printf ("chan: %d blockindx: %3d indx: %3d\n", chan, blockindx, indx) ; - - 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] ; - if (stepindx [chan] < 0) - stepindx [chan] = 0 ; - else if (stepindx [chan] > 88) - stepindx [chan] = 88 ; - - 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] ; - - if (stepindx [chan] < 0) - stepindx [chan] = 0 ; - else if (stepindx [chan] > 88) - stepindx [chan] = 88 ; - - 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] ; - if (pima->stepindx [chan] < 0) - pima->stepindx [chan] = 0 ; - else if (pima->stepindx [chan] > 88) - pima->stepindx [chan] = 88 ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata = (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 (psf->sf.format & SF_FORMAT_TYPEMASK) - { 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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->fdata) - return 0 ; - pima = (IMA_ADPCM_PRIVATE*) psf->fdata ; - - 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 */ - - -/* -** 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: 75a54b82-ad18-4758-9933-64e00a7f24e0 -*/ |