131 lines
5.1 KiB
C
131 lines
5.1 KiB
C
/*
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* Copyright (c) 2007 Ian Caulfield
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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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License 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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#ifndef AVCODEC_MLP_PARSE_H
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#define AVCODEC_MLP_PARSE_H
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#include <stdint.h>
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#include "libavutil/channel_layout.h"
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#include "get_bits.h"
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typedef struct MLPHeaderInfo
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{
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int stream_type; ///< 0xBB for MLP, 0xBA for TrueHD
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int header_size; ///< Size of the major sync header, in bytes
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int group1_bits; ///< The bit depth of the first substream
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int group2_bits; ///< Bit depth of the second substream (MLP only)
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int group1_samplerate; ///< Sample rate of first substream
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int group2_samplerate; ///< Sample rate of second substream (MLP only)
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int channel_arrangement;
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int channel_modifier_thd_stream0; ///< Channel modifier for substream 0 of TrueHD streams ("2-channel presentation")
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int channel_modifier_thd_stream1; ///< Channel modifier for substream 1 of TrueHD streams ("6-channel presentation")
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int channel_modifier_thd_stream2; ///< Channel modifier for substream 2 of TrueHD streams ("8-channel presentation")
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int channels_mlp; ///< Channel count for MLP streams
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int channels_thd_stream1; ///< Channel count for substream 1 of TrueHD streams ("6-channel presentation")
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int channels_thd_stream2; ///< Channel count for substream 2 of TrueHD streams ("8-channel presentation")
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uint64_t channel_layout_mlp; ///< Channel layout for MLP streams
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uint64_t channel_layout_thd_stream1; ///< Channel layout for substream 1 of TrueHD streams ("6-channel presentation")
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uint64_t channel_layout_thd_stream2; ///< Channel layout for substream 2 of TrueHD streams ("8-channel presentation")
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int access_unit_size; ///< Number of samples per coded frame
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int access_unit_size_pow2; ///< Next power of two above number of samples per frame
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int is_vbr; ///< Stream is VBR instead of CBR
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int peak_bitrate; ///< Peak bitrate for VBR, actual bitrate (==peak) for CBR
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int num_substreams; ///< Number of substreams within stream
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int extended_substream_info; ///< Which substream of substreams carry 16-channel presentation
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int substream_info; ///< Which substream of substreams carry 2/6/8-channel presentation
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} MLPHeaderInfo;
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static const uint8_t thd_chancount[13] = {
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// LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2
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2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1
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};
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static const uint64_t thd_layout[13] = {
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AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR
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AV_CH_FRONT_CENTER, // C
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AV_CH_LOW_FREQUENCY, // LFE
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AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs
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AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh
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AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc
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AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs
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AV_CH_BACK_CENTER, // Cs
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AV_CH_TOP_CENTER, // Ts
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AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd
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AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw
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AV_CH_TOP_FRONT_CENTER, // Cvh
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AV_CH_LOW_FREQUENCY_2, // LFE2
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};
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static inline int mlp_samplerate(int in)
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{
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if (in == 0xF)
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return 0;
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return (in & 8 ? 44100 : 48000) << (in & 7) ;
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}
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static inline int truehd_channels(int chanmap)
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{
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int channels = 0, i;
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for (i = 0; i < 13; i++)
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channels += thd_chancount[i] * ((chanmap >> i) & 1);
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return channels;
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}
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static inline uint64_t truehd_layout(int chanmap)
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{
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int i;
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uint64_t layout = 0;
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for (i = 0; i < 13; i++)
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layout |= thd_layout[i] * ((chanmap >> i) & 1);
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return layout;
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}
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static inline int layout_truehd(uint64_t layout)
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{
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int chanmap = 0;
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for (int i = 0; i < 13; i++) {
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if ((layout & thd_layout[i]) == thd_layout[i])
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chanmap |= 1 << i;
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}
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return chanmap;
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}
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int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb);
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#endif /* AVCODEC_MLP_PARSE_H */
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