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297 lines
7.5 KiB
297 lines
7.5 KiB
/* |
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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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* |
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* This file is part of FFmpeg. |
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* |
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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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* |
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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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* |
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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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*/ |
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#include "avcodec.h" |
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#include <dts.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#define BUFFER_SIZE 18726 |
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#define HEADER_SIZE 14 |
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#ifdef LIBDTS_FIXED |
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#define CONVERT_LEVEL (1 << 26) |
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#define CONVERT_BIAS 0 |
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#else |
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#define CONVERT_LEVEL 1 |
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#define CONVERT_BIAS 384 |
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#endif |
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static inline int16_t |
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convert(int32_t i) |
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{ |
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#ifdef LIBDTS_FIXED |
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i >>= 15; |
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#else |
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i -= 0x43c00000; |
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#endif |
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return (i > 32767) ? 32767 : ((i < -32768) ? -32768 : i); |
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} |
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static void |
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convert2s16_2(sample_t * _f, int16_t * s16) |
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{ |
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int i; |
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int32_t *f = (int32_t *) _f; |
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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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} |
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} |
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static void |
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convert2s16_4(sample_t * _f, int16_t * s16) |
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{ |
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int i; |
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int32_t *f = (int32_t *) _f; |
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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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} |
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} |
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static void |
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convert2s16_5(sample_t * _f, int16_t * s16) |
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{ |
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int i; |
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int32_t *f = (int32_t *) _f; |
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for(i = 0; i < 256; i++) { |
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s16[5 * i] = convert(f[i]); |
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s16[5 * i + 1] = convert(f[i + 256]); |
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s16[5 * i + 2] = convert(f[i + 512]); |
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s16[5 * i + 3] = convert(f[i + 768]); |
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s16[5 * i + 4] = convert(f[i + 1024]); |
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} |
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} |
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static void |
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convert2s16_multi(sample_t * _f, int16_t * s16, int flags) |
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{ |
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int i; |
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int32_t *f = (int32_t *) _f; |
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switch (flags) { |
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case DTS_MONO: |
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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] = |
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0; |
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s16[5 * i + 4] = convert(f[i]); |
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} |
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break; |
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case DTS_CHANNEL: |
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case DTS_STEREO: |
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case DTS_DOLBY: |
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convert2s16_2(_f, s16); |
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break; |
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case DTS_3F: |
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for(i = 0; i < 256; i++) { |
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s16[5 * i] = convert(f[i]); |
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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 + 256]); |
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} |
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break; |
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case DTS_2F2R: |
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convert2s16_4(_f, s16); |
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break; |
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case DTS_3F2R: |
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convert2s16_5(_f, s16); |
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break; |
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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] = |
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0; |
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s16[6 * i + 4] = convert(f[i + 256]); |
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s16[6 * i + 5] = convert(f[i]); |
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} |
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break; |
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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 + 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] = s16[6 * i + 4] = 0; |
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s16[6 * i + 5] = convert(f[i]); |
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} |
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break; |
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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 + 768]); |
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s16[6 * i + 2] = s16[6 * i + 3] = 0; |
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s16[6 * i + 4] = convert(f[i + 512]); |
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s16[6 * i + 5] = convert(f[i]); |
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} |
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break; |
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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 + 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] = 0; |
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s16[6 * i + 5] = convert(f[i]); |
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} |
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break; |
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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 + 768]); |
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s16[6 * i + 2] = convert(f[i + 1024]); |
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s16[6 * i + 3] = convert(f[i + 1280]); |
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s16[6 * i + 4] = convert(f[i + 512]); |
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s16[6 * i + 5] = convert(f[i]); |
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} |
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break; |
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} |
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} |
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static int |
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channels_multi(int flags) |
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{ |
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if(flags & DTS_LFE) |
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return 6; |
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else if(flags & 1) /* center channel */ |
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return 5; |
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else if((flags & DTS_CHANNEL_MASK) == DTS_2F2R) |
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return 4; |
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else |
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return 2; |
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} |
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static int |
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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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{ |
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uint8_t *start = buff; |
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uint8_t *end = buff + buff_size; |
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static uint8_t buf[BUFFER_SIZE]; |
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static uint8_t *bufptr = buf; |
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static uint8_t *bufpos = buf + HEADER_SIZE; |
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int16_t *out_samples = data; |
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static int sample_rate; |
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static int frame_length; |
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static int flags; |
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int bit_rate; |
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int len; |
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dts_state_t *state = avctx->priv_data; |
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level_t level; |
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sample_t bias; |
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int i; |
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*data_size = 0; |
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while(1) { |
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int length; |
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len = end - start; |
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if(!len) |
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break; |
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if(len > bufpos - bufptr) |
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len = bufpos - bufptr; |
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memcpy(bufptr, start, len); |
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bufptr += len; |
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start += len; |
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if(bufptr != bufpos) |
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return start - buff; |
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if(bufpos != buf + HEADER_SIZE) |
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break; |
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length = dts_syncinfo(state, buf, &flags, &sample_rate, &bit_rate, |
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&frame_length); |
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if(!length) { |
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av_log(NULL, AV_LOG_INFO, "skip\n"); |
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for(bufptr = buf; bufptr < buf + HEADER_SIZE - 1; bufptr++) |
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bufptr[0] = bufptr[1]; |
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continue; |
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} |
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bufpos = buf + length; |
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} |
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flags = 2; /* ???????????? */ |
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level = CONVERT_LEVEL; |
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bias = CONVERT_BIAS; |
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flags |= DTS_ADJUST_LEVEL; |
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if(dts_frame(state, buf, &flags, &level, bias)) { |
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av_log(avctx, AV_LOG_ERROR, "dts_frame() failed\n"); |
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goto end; |
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} |
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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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for(i = 0; i < dts_blocks_num(state); i++) { |
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int chans; |
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if(dts_block(state)) { |
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av_log(avctx, AV_LOG_ERROR, "dts_block() failed\n"); |
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goto end; |
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} |
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chans = channels_multi(flags); |
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convert2s16_multi(dts_samples(state), out_samples, |
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flags & (DTS_CHANNEL_MASK | DTS_LFE)); |
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out_samples += 256 * chans; |
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*data_size += 256 * sizeof(int16_t) * chans; |
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} |
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end: |
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bufptr = buf; |
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bufpos = buf + HEADER_SIZE; |
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return start - buff; |
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} |
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static int |
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dts_decode_init(AVCodecContext * avctx) |
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{ |
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avctx->priv_data = dts_init(0); |
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if(avctx->priv_data == NULL) |
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return -1; |
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return 0; |
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} |
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static int |
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dts_decode_end(AVCodecContext * s) |
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{ |
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return 0; |
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} |
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AVCodec dts_decoder = { |
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"dts", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_DTS, |
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sizeof(dts_state_t *), |
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dts_decode_init, |
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NULL, |
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dts_decode_end, |
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dts_decode_frame, |
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};
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