1/* 2 * Copyright (c) 2007 Ian Caulfield 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#ifndef AVCODEC_MLP_PARSE_H 22#define AVCODEC_MLP_PARSE_H 23 24#include <stdint.h> 25 26#include "libavutil/channel_layout.h" 27 28#include "get_bits.h" 29 30typedef struct MLPHeaderInfo 31{ 32 int stream_type; ///< 0xBB for MLP, 0xBA for TrueHD 33 int header_size; ///< Size of the major sync header, in bytes 34 35 int group1_bits; ///< The bit depth of the first substream 36 int group2_bits; ///< Bit depth of the second substream (MLP only) 37 38 int group1_samplerate; ///< Sample rate of first substream 39 int group2_samplerate; ///< Sample rate of second substream (MLP only) 40 41 int channel_arrangement; 42 43 int channel_modifier_thd_stream0; ///< Channel modifier for substream 0 of TrueHD streams ("2-channel presentation") 44 int channel_modifier_thd_stream1; ///< Channel modifier for substream 1 of TrueHD streams ("6-channel presentation") 45 int channel_modifier_thd_stream2; ///< Channel modifier for substream 2 of TrueHD streams ("8-channel presentation") 46 47 int channels_mlp; ///< Channel count for MLP streams 48 int channels_thd_stream1; ///< Channel count for substream 1 of TrueHD streams ("6-channel presentation") 49 int channels_thd_stream2; ///< Channel count for substream 2 of TrueHD streams ("8-channel presentation") 50 uint64_t channel_layout_mlp; ///< Channel layout for MLP streams 51 uint64_t channel_layout_thd_stream1; ///< Channel layout for substream 1 of TrueHD streams ("6-channel presentation") 52 uint64_t channel_layout_thd_stream2; ///< Channel layout for substream 2 of TrueHD streams ("8-channel presentation") 53 54 int access_unit_size; ///< Number of samples per coded frame 55 int access_unit_size_pow2; ///< Next power of two above number of samples per frame 56 57 int is_vbr; ///< Stream is VBR instead of CBR 58 int peak_bitrate; ///< Peak bitrate for VBR, actual bitrate (==peak) for CBR 59 60 int num_substreams; ///< Number of substreams within stream 61} MLPHeaderInfo; 62 63static const uint8_t thd_chancount[13] = { 64// LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2 65 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1 66}; 67 68static const uint64_t thd_layout[13] = { 69 AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR 70 AV_CH_FRONT_CENTER, // C 71 AV_CH_LOW_FREQUENCY, // LFE 72 AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs 73 AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh 74 AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc 75 AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs 76 AV_CH_BACK_CENTER, // Cs 77 AV_CH_TOP_CENTER, // Ts 78 AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd 79 AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw 80 AV_CH_TOP_FRONT_CENTER, // Cvh 81 AV_CH_LOW_FREQUENCY_2, // LFE2 82}; 83 84static inline int mlp_samplerate(int in) 85{ 86 if (in == 0xF) 87 return 0; 88 89 return (in & 8 ? 44100 : 48000) << (in & 7) ; 90} 91 92static inline int truehd_channels(int chanmap) 93{ 94 int channels = 0, i; 95 96 for (i = 0; i < 13; i++) 97 channels += thd_chancount[i] * ((chanmap >> i) & 1); 98 99 return channels; 100} 101 102static inline uint64_t truehd_layout(int chanmap) 103{ 104 int i; 105 uint64_t layout = 0; 106 107 for (i = 0; i < 13; i++) 108 layout |= thd_layout[i] * ((chanmap >> i) & 1); 109 110 return layout; 111} 112 113int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb); 114 115#endif /* AVCODEC_MLP_PARSE_H */ 116