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* dtsdec.c : free DTS Coherent Acoustics stream decoder.
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* Copyright (C) 2004 Benjamin Zores <ben@geexbox.org>
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#define BUFFER_SIZE 18726
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#define HEADER_SIZE 14
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#define CONVERT_LEVEL 1
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#define CONVERT_BIAS 0
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typedef struct DTSContext {
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uint8_t buf[BUFFER_SIZE];
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convert2s16_multi(sample_t *f, int16_t *s16, int flags)
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switch(flags & (DTS_CHANNEL_MASK | DTS_LFE)){
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for(i = 0; i < 256; i++){
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s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
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s16[5*i+4] = convert(f[i]);
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for(i = 0; i < 256; i++){
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s16[2*i] = convert(f[i]);
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s16[2*i+1] = convert(f[i+256]);
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for(i = 0; i < 256; i++){
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s16[5*i] = convert(f[i+256]);
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s16[5*i+1] = convert(f[i+512]);
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s16[5*i+2] = s16[5*i+3] = 0;
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s16[5*i+4] = convert(f[i]);
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for(i = 0; i < 256; i++){
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s16[4*i] = convert(f[i]);
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s16[4*i+1] = convert(f[i+256]);
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s16[4*i+2] = convert(f[i+512]);
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s16[4*i+3] = convert(f[i+768]);
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for(i = 0; i < 256; i++){
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s16[5*i] = convert(f[i+256]);
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s16[5*i+1] = convert(f[i+512]);
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s16[5*i+2] = convert(f[i+768]);
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s16[5*i+3] = convert(f[i+1024]);
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s16[5*i+4] = convert(f[i]);
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case DTS_MONO | DTS_LFE:
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for(i = 0; i < 256; i++){
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s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
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s16[6*i+4] = convert(f[i]);
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s16[6*i+5] = convert(f[i+256]);
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case DTS_CHANNEL | DTS_LFE:
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case DTS_STEREO | DTS_LFE:
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case DTS_DOLBY | DTS_LFE:
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for(i = 0; i < 256; i++){
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s16[6*i] = convert(f[i]);
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s16[6*i+1] = convert(f[i+256]);
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s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
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s16[6*i+5] = convert(f[i+512]);
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case DTS_3F | DTS_LFE:
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for(i = 0; i < 256; i++){
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s16[6*i] = convert(f[i+256]);
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s16[6*i+1] = convert(f[i+512]);
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s16[6*i+2] = s16[6*i+3] = 0;
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s16[6*i+4] = convert(f[i]);
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s16[6*i+5] = convert(f[i+768]);
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case DTS_2F2R | DTS_LFE:
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for(i = 0; i < 256; i++){
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s16[6*i] = convert(f[i]);
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s16[6*i+1] = convert(f[i+256]);
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s16[6*i+2] = convert(f[i+512]);
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s16[6*i+3] = convert(f[i+768]);
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s16[6*i+5] = convert(f[i+1024]);
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case DTS_3F2R | DTS_LFE:
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for(i = 0; i < 256; i++){
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s16[6*i] = convert(f[i+256]);
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s16[6*i+1] = convert(f[i+512]);
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s16[6*i+2] = convert(f[i+768]);
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s16[6*i+3] = convert(f[i+1024]);
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s16[6*i+4] = convert(f[i]);
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s16[6*i+5] = convert(f[i+1280]);
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channels_multi(int flags)
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switch(flags & (DTS_CHANNEL_MASK | DTS_LFE)){
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case DTS_MONO | DTS_LFE:
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case DTS_CHANNEL | DTS_LFE:
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case DTS_STEREO | DTS_LFE:
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case DTS_DOLBY | DTS_LFE:
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case DTS_3F | DTS_LFE:
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case DTS_2F2R | DTS_LFE:
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case DTS_3F2R | DTS_LFE:
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dts_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
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uint8_t * buff, int buff_size)
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DTSContext *s = avctx->priv_data;
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uint8_t *start = buff;
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uint8_t *end = buff + buff_size;
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int16_t *out_samples = data;
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if(len > s->bufpos - s->bufptr)
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len = s->bufpos - s->bufptr;
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memcpy(s->bufptr, start, len);
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if(s->bufptr != s->bufpos)
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if(s->bufpos != s->buf + HEADER_SIZE)
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length = dts_syncinfo(s->state, s->buf, &flags, &sample_rate,
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&bit_rate, &frame_length);
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av_log(NULL, AV_LOG_INFO, "skip\n");
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for(s->bufptr = s->buf; s->bufptr < s->buf + HEADER_SIZE - 1; s->bufptr++)
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s->bufptr[0] = s->bufptr[1];
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s->bufpos = s->buf + length;
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level = CONVERT_LEVEL;
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flags |= DTS_ADJUST_LEVEL;
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if(dts_frame(s->state, s->buf, &flags, &level, bias)) {
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av_log(avctx, AV_LOG_ERROR, "dts_frame() failed\n");
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avctx->sample_rate = sample_rate;
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avctx->channels = channels_multi(flags);
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avctx->bit_rate = bit_rate;
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nblocks = dts_blocks_num(s->state);
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for(i = 0; i < nblocks; i++) {
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if(dts_block(s->state)) {
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av_log(avctx, AV_LOG_ERROR, "dts_block() failed\n");
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convert2s16_multi(dts_samples(s->state), out_samples, flags);
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out_samples += 256 * avctx->channels;
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*data_size += 256 * sizeof(int16_t) * avctx->channels;
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s->bufpos = s->buf + HEADER_SIZE;
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dts_decode_init(AVCodecContext * avctx)
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DTSContext *s = avctx->priv_data;
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s->bufpos = s->buf + HEADER_SIZE;
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s->state = dts_init(0);
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dts_decode_end(AVCodecContext * avctx)
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DTSContext *s = avctx->priv_data;
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AVCodec dts_decoder = {