+++ /dev/null
-/*
- * ADPCM codecs
- * Copyright (c) 2001-2003 The ffmpeg Project
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include "avcodec.h"
-
-/**
- * @file adpcm.c
- * ADPCM codecs.
- * First version by Francois Revol revol@free.fr
- * Fringe ADPCM codecs (e.g., DK3 and DK4)
- * by Mike Melanson (melanson@pcisys.net)
- *
- * Features and limitations:
- *
- * Reference documents:
- * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
- * http://www.geocities.com/SiliconValley/8682/aud3.txt
- * http://openquicktime.sourceforge.net/plugins.htm
- * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
- * http://www.cs.ucla.edu/~leec/mediabench/applications.html
- * SoX source code http://home.sprynet.com/~cbagwell/sox.html
- */
-
-#define BLKSIZE 1024
-
-#define CLAMP_TO_SHORT(value) \
-if (value > 32767) \
- value = 32767; \
-else if (value < -32768) \
- value = -32768; \
-
-/* step_table[] and index_table[] are from the ADPCM reference source */
-/* This is the index table: */
-static const int index_table[16] = {
- -1, -1, -1, -1, 2, 4, 6, 8,
- -1, -1, -1, -1, 2, 4, 6, 8,
-};
-
-/**
- * This is the step table. Note that many programs use slight deviations from
- * this table, but such deviations are negligible:
- */
-static const int step_table[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
-};
-
-/* Those are for MS-ADPCM */
-/* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
-static const int AdaptationTable[] = {
- 230, 230, 230, 230, 307, 409, 512, 614,
- 768, 614, 512, 409, 307, 230, 230, 230
-};
-
-static const int AdaptCoeff1[] = {
- 256, 512, 0, 192, 240, 460, 392
-};
-
-static const int AdaptCoeff2[] = {
- 0, -256, 0, 64, 0, -208, -232
-};
-
-/* end of tables */
-
-typedef struct ADPCMChannelStatus {
- int predictor;
- short int step_index;
- int step;
- /* for encoding */
- int prev_sample;
-
- /* MS version */
- short sample1;
- short sample2;
- int coeff1;
- int coeff2;
- int idelta;
-} ADPCMChannelStatus;
-
-typedef struct ADPCMContext {
- int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
- ADPCMChannelStatus status[2];
- short sample_buffer[32]; /* hold left samples while waiting for right samples */
-} ADPCMContext;
-
-/* XXX: implement encoding */
-
-static int adpcm_encode_init(AVCodecContext *avctx)
-{
- if (avctx->channels > 2)
- return -1; /* only stereo or mono =) */
- switch(avctx->codec->id) {
- case CODEC_ID_ADPCM_IMA_QT:
- fprintf(stderr, "ADPCM: codec admcp_ima_qt unsupported for encoding !\n");
- avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
- return -1;
- break;
- case CODEC_ID_ADPCM_IMA_WAV:
- avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
- /* and we have 4 bytes per channel overhead */
- avctx->block_align = BLKSIZE;
- /* seems frame_size isn't taken into account... have to buffer the samples :-( */
- break;
- case CODEC_ID_ADPCM_MS:
- fprintf(stderr, "ADPCM: codec admcp_ms unsupported for encoding !\n");
- return -1;
- break;
- default:
- return -1;
- break;
- }
-
- avctx->coded_frame= avcodec_alloc_frame();
- avctx->coded_frame->key_frame= 1;
-
- return 0;
-}
-
-static int adpcm_encode_close(AVCodecContext *avctx)
-{
- av_freep(&avctx->coded_frame);
-
- return 0;
-}
-
-
-static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
-{
- int step_index;
- unsigned char nibble;
-
- int sign = 0; /* sign bit of the nibble (MSB) */
- int delta, predicted_delta;
-
- delta = sample - c->prev_sample;
-
- if (delta < 0) {
- sign = 1;
- delta = -delta;
- }
-
- step_index = c->step_index;
-
- /* nibble = 4 * delta / step_table[step_index]; */
- nibble = (delta << 2) / step_table[step_index];
-
- if (nibble > 7)
- nibble = 7;
-
- step_index += index_table[nibble];
- if (step_index < 0)
- step_index = 0;
- if (step_index > 88)
- step_index = 88;
-
- /* what the decoder will find */
- predicted_delta = ((step_table[step_index] * nibble) / 4) + (step_table[step_index] / 8);
-
- if (sign)
- c->prev_sample -= predicted_delta;
- else
- c->prev_sample += predicted_delta;
-
- CLAMP_TO_SHORT(c->prev_sample);
-
-
- nibble += sign << 3; /* sign * 8 */
-
- /* save back */
- c->step_index = step_index;
-
- return nibble;
-}
-
-static int adpcm_encode_frame(AVCodecContext *avctx,
- unsigned char *frame, int buf_size, void *data)
-{
- int n;
- short *samples;
- unsigned char *dst;
- ADPCMContext *c = avctx->priv_data;
-
- dst = frame;
- samples = (short *)data;
-/* n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
-
- switch(avctx->codec->id) {
- case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */
- break;
- case CODEC_ID_ADPCM_IMA_WAV:
- n = avctx->frame_size / 8;
- c->status[0].prev_sample = (signed short)samples[0]; /* XXX */
-/* c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */
- *dst++ = (c->status[0].prev_sample) & 0xFF; /* little endian */
- *dst++ = (c->status[0].prev_sample >> 8) & 0xFF;
- *dst++ = (unsigned char)c->status[0].step_index;
- *dst++ = 0; /* unknown */
- samples++;
- if (avctx->channels == 2) {
- c->status[1].prev_sample = (signed short)samples[0];
-/* c->status[1].step_index = 0; */
- *dst++ = (c->status[1].prev_sample) & 0xFF;
- *dst++ = (c->status[1].prev_sample >> 8) & 0xFF;
- *dst++ = (unsigned char)c->status[1].step_index;
- *dst++ = 0;
- samples++;
- }
-
- /* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */
- for (; n>0; n--) {
- *dst = adpcm_ima_compress_sample(&c->status[0], samples[0]) & 0x0F;
- *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4) & 0xF0;
- dst++;
- *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]) & 0x0F;
- *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4) & 0xF0;
- dst++;
- *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]) & 0x0F;
- *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4) & 0xF0;
- dst++;
- *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]) & 0x0F;
- *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4) & 0xF0;
- dst++;
- /* right channel */
- if (avctx->channels == 2) {
- *dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);
- *dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;
- dst++;
- *dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);
- *dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;
- dst++;
- *dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);
- *dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;
- dst++;
- *dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);
- *dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;
- dst++;
- }
- samples += 8 * avctx->channels;
- }
- break;
- default:
- return -1;
- }
- return dst - frame;
-}
-
-static int adpcm_decode_init(AVCodecContext * avctx)
-{
- ADPCMContext *c = avctx->priv_data;
-
- c->channel = 0;
- c->status[0].predictor = c->status[1].predictor = 0;
- c->status[0].step_index = c->status[1].step_index = 0;
- c->status[0].step = c->status[1].step = 0;
-
- switch(avctx->codec->id) {
- default:
- break;
- }
- return 0;
-}
-
-static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble)
-{
- int step_index;
- int predictor;
- int sign, delta, diff, step;
-
- step = step_table[c->step_index];
- step_index = c->step_index + index_table[(unsigned)nibble];
- if (step_index < 0) step_index = 0;
- else if (step_index > 88) step_index = 88;
-
- sign = nibble & 8;
- delta = nibble & 7;
- /* perform direct multiplication instead of series of jumps proposed by
- * the reference ADPCM implementation since modern CPUs can do the mults
- * quickly enough */
- diff = ((2 * delta + 1) * step) >> 3;
- predictor = c->predictor;
- if (sign) predictor -= diff;
- else predictor += diff;
-
- CLAMP_TO_SHORT(predictor);
- c->predictor = predictor;
- c->step_index = step_index;
-
- return (short)predictor;
-}
-
-static inline short adpcm_4xa_expand_nibble(ADPCMChannelStatus *c, char nibble)
-{
- int step_index;
- int predictor;
- int sign, delta, diff, step;
-
- step = step_table[c->step_index];
- step_index = c->step_index + index_table[(unsigned)nibble];
- if (step_index < 0) step_index = 0;
- else if (step_index > 88) step_index = 88;
-
- sign = nibble & 8;
- delta = nibble & 7;
-
- diff = (delta*step + (step>>1))>>3; // difference to code above
-
- predictor = c->predictor;
- if (sign) predictor -= diff;
- else predictor += diff;
-
- CLAMP_TO_SHORT(predictor);
- c->predictor = predictor;
- c->step_index = step_index;
-
- return (short)predictor;
-}
-
-static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
-{
- int predictor;
-
- predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
- predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
- CLAMP_TO_SHORT(predictor);
-
- c->sample2 = c->sample1;
- c->sample1 = predictor;
- c->idelta = (AdaptationTable[(int)nibble] * c->idelta) / 256;
- if (c->idelta < 16) c->idelta = 16;
-
- return (short)predictor;
-}
-
-/* DK3 ADPCM support macro */
-#define DK3_GET_NEXT_NIBBLE() \
- if (decode_top_nibble_next) \
- { \
- nibble = (last_byte >> 4) & 0x0F; \
- decode_top_nibble_next = 0; \
- } \
- else \
- { \
- last_byte = *src++; \
- if (src >= buf + buf_size) break; \
- nibble = last_byte & 0x0F; \
- decode_top_nibble_next = 1; \
- }
-
-static int adpcm_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- ADPCMContext *c = avctx->priv_data;
- ADPCMChannelStatus *cs;
- int n, m, channel, i;
- int block_predictor[2];
- short *samples;
- uint8_t *src;
- int st; /* stereo */
-
- /* DK3 ADPCM accounting variables */
- unsigned char last_byte = 0;
- unsigned char nibble;
- int decode_top_nibble_next = 0;
- int diff_channel;
-
- samples = data;
- src = buf;
-
- st = avctx->channels == 2;
-
- switch(avctx->codec->id) {
- case CODEC_ID_ADPCM_IMA_QT:
- n = (buf_size - 2);/* >> 2*avctx->channels;*/
- channel = c->channel;
- cs = &(c->status[channel]);
- /* (pppppp) (piiiiiii) */
-
- /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
- cs->predictor = (*src++) << 8;
- cs->predictor |= (*src & 0x80);
- cs->predictor &= 0xFF80;
-
- /* sign extension */
- if(cs->predictor & 0x8000)
- cs->predictor -= 0x10000;
-
- CLAMP_TO_SHORT(cs->predictor);
-
- cs->step_index = (*src++) & 0x7F;
-
- if (cs->step_index > 88) fprintf(stderr, "ERROR: step_index = %i\n", cs->step_index);
- if (cs->step_index > 88) cs->step_index = 88;
-
- cs->step = step_table[cs->step_index];
-
- if (st && channel)
- samples++;
-
- *samples++ = cs->predictor;
- samples += st;
-
- for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
- *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F);
- samples += avctx->channels;
- *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F);
- samples += avctx->channels;
- src ++;
- }
-
- if(st) { /* handle stereo interlacing */
- c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
- if(channel == 0) { /* wait for the other packet before outputing anything */
- *data_size = 0;
- return src - buf;
- }
- }
- break;
- case CODEC_ID_ADPCM_IMA_WAV:
- if (buf_size > BLKSIZE) {
- if (avctx->block_align != 0)
- buf_size = avctx->block_align;
- else
- buf_size = BLKSIZE;
- }
- // XXX: do as per-channel loop
- cs = &(c->status[0]);
- cs->predictor = (*src++) & 0x0FF;
- cs->predictor |= ((*src++) << 8) & 0x0FF00;
- if(cs->predictor & 0x8000)
- cs->predictor -= 0x10000;
- CLAMP_TO_SHORT(cs->predictor);
-
- // XXX: is this correct ??: *samples++ = cs->predictor;
-
- cs->step_index = *src++;
- if (cs->step_index < 0) cs->step_index = 0;
- if (cs->step_index > 88) cs->step_index = 88;
- if (*src++) fprintf(stderr, "unused byte should be null !!\n"); /* unused */
-
- if (st) {
- cs = &(c->status[1]);
- cs->predictor = (*src++) & 0x0FF;
- cs->predictor |= ((*src++) << 8) & 0x0FF00;
- if(cs->predictor & 0x8000)
- cs->predictor -= 0x10000;
- CLAMP_TO_SHORT(cs->predictor);
-
- // XXX: is this correct ??: *samples++ = cs->predictor;
-
- cs->step_index = *src++;
- if (cs->step_index < 0) cs->step_index = 0;
- if (cs->step_index > 88) cs->step_index = 88;
- src++; /* if != 0 -> out-of-sync */
- }
-
- for(m=4; src < (buf + buf_size);) {
- *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] & 0x0F);
- if (st)
- *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[4] & 0x0F);
- *samples++ = adpcm_ima_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
- if (st) {
- *samples++ = adpcm_ima_expand_nibble(&c->status[1], (src[4] >> 4) & 0x0F);
- if (!--m) {
- m=4;
- src+=4;
- }
- }
- src++;
- }
- break;
- case CODEC_ID_ADPCM_4XM:
- cs = &(c->status[0]);
- c->status[0].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
- if(st){
- c->status[1].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
- }
- c->status[0].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
- if(st){
- c->status[1].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
- }
-// if (cs->step_index < 0) cs->step_index = 0;
-// if (cs->step_index > 88) cs->step_index = 88;
-
- m= (buf_size - (src - buf))>>st;
-//printf("%d %d %d %d\n", st, m, c->status[0].predictor, c->status[0].step_index);
- //FIXME / XXX decode chanels individual & interleave samples
- for(i=0; i<m; i++) {
- *samples++ = adpcm_4xa_expand_nibble(&c->status[0], src[i] & 0x0F);
- if (st)
- *samples++ = adpcm_4xa_expand_nibble(&c->status[1], src[i+m] & 0x0F);
- *samples++ = adpcm_4xa_expand_nibble(&c->status[0], src[i] >> 4);
- if (st)
- *samples++ = adpcm_4xa_expand_nibble(&c->status[1], src[i+m] >> 4);
- }
-
- src += m<<st;
-
- break;
- case CODEC_ID_ADPCM_MS:
-
- if (buf_size > BLKSIZE) {
- if (avctx->block_align != 0)
- buf_size = avctx->block_align;
- else
- buf_size = BLKSIZE;
- }
- n = buf_size - 7 * avctx->channels;
- if (n < 0)
- return -1;
- block_predictor[0] = (*src++); /* should be bound */
- block_predictor[0] = (block_predictor[0] < 0)?(0):((block_predictor[0] > 7)?(7):(block_predictor[0]));
- block_predictor[1] = 0;
- if (st)
- block_predictor[1] = (*src++);
- block_predictor[1] = (block_predictor[1] < 0)?(0):((block_predictor[1] > 7)?(7):(block_predictor[1]));
- c->status[0].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- if (c->status[0].idelta & 0x08000)
- c->status[0].idelta -= 0x10000;
- src+=2;
- if (st)
- c->status[1].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- if (st && c->status[1].idelta & 0x08000)
- c->status[1].idelta |= 0xFFFF0000;
- if (st)
- src+=2;
- c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
- c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
- c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
- c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
-
- c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- src+=2;
- if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- if (st) src+=2;
- c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- src+=2;
- if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- if (st) src+=2;
-
- *samples++ = c->status[0].sample1;
- if (st) *samples++ = c->status[1].sample1;
- *samples++ = c->status[0].sample2;
- if (st) *samples++ = c->status[1].sample2;
- for(;n>0;n--) {
- *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
- *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
- src ++;
- }
- break;
- case CODEC_ID_ADPCM_IMA_DK4:
- if (buf_size > BLKSIZE) {
- if (avctx->block_align != 0)
- buf_size = avctx->block_align;
- else
- buf_size = BLKSIZE;
- }
- c->status[0].predictor = (src[0] | (src[1] << 8));
- c->status[0].step_index = src[2];
- src += 4;
- if(c->status[0].predictor & 0x8000)
- c->status[0].predictor -= 0x10000;
- *samples++ = c->status[0].predictor;
- if (st) {
- c->status[1].predictor = (src[0] | (src[1] << 8));
- c->status[1].step_index = src[2];
- src += 4;
- if(c->status[1].predictor & 0x8000)
- c->status[1].predictor -= 0x10000;
- *samples++ = c->status[1].predictor;
- }
- while (src < buf + buf_size) {
-
- /* take care of the top nibble (always left or mono channel) */
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- (src[0] >> 4) & 0x0F);
-
- /* take care of the bottom nibble, which is right sample for
- * stereo, or another mono sample */
- if (st)
- *samples++ = adpcm_ima_expand_nibble(&c->status[1],
- src[0] & 0x0F);
- else
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] & 0x0F);
-
- src++;
- }
- break;
- case CODEC_ID_ADPCM_IMA_DK3:
- if (buf_size > BLKSIZE) {
- if (avctx->block_align != 0)
- buf_size = avctx->block_align;
- else
- buf_size = BLKSIZE;
- }
- c->status[0].predictor = (src[10] | (src[11] << 8));
- c->status[1].predictor = (src[12] | (src[13] << 8));
- c->status[0].step_index = src[14];
- c->status[1].step_index = src[15];
- /* sign extend the predictors */
- if(c->status[0].predictor & 0x8000)
- c->status[0].predictor -= 0x10000;
- if(c->status[1].predictor & 0x8000)
- c->status[1].predictor -= 0x10000;
- src += 16;
- diff_channel = c->status[1].predictor;
-
- /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
- * the buffer is consumed */
- while (1) {
-
- /* for this algorithm, c->status[0] is the sum channel and
- * c->status[1] is the diff channel */
-
- /* process the first predictor of the sum channel */
- DK3_GET_NEXT_NIBBLE();
- adpcm_ima_expand_nibble(&c->status[0], nibble);
-
- /* process the diff channel predictor */
- DK3_GET_NEXT_NIBBLE();
- adpcm_ima_expand_nibble(&c->status[1], nibble);
-
- /* process the first pair of stereo PCM samples */
- diff_channel = (diff_channel + c->status[1].predictor) / 2;
- *samples++ = c->status[0].predictor + c->status[1].predictor;
- *samples++ = c->status[0].predictor - c->status[1].predictor;
-
- /* process the second predictor of the sum channel */
- DK3_GET_NEXT_NIBBLE();
- adpcm_ima_expand_nibble(&c->status[0], nibble);
-
- /* process the second pair of stereo PCM samples */
- diff_channel = (diff_channel + c->status[1].predictor) / 2;
- *samples++ = c->status[0].predictor + c->status[1].predictor;
- *samples++ = c->status[0].predictor - c->status[1].predictor;
- }
- break;
- default:
- *data_size = 0;
- return -1;
- }
- *data_size = (uint8_t *)samples - (uint8_t *)data;
- return src - buf;
-}
-
-#define ADPCM_CODEC(id, name) \
-AVCodec name ## _encoder = { \
- #name, \
- CODEC_TYPE_AUDIO, \
- id, \
- sizeof(ADPCMContext), \
- adpcm_encode_init, \
- adpcm_encode_frame, \
- adpcm_encode_close, \
- NULL, \
-}; \
-AVCodec name ## _decoder = { \
- #name, \
- CODEC_TYPE_AUDIO, \
- id, \
- sizeof(ADPCMContext), \
- adpcm_decode_init, \
- NULL, \
- NULL, \
- adpcm_decode_frame, \
-};
-
-ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
-ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
-ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
-ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
-ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
-ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
-
-#undef ADPCM_CODEC
projects / synfig.git / blobdiff