| /* |
| * Copyright (c) 2007 Ian Caulfield |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_MLP_PARSE_H |
| #define AVCODEC_MLP_PARSE_H |
| |
| #include <stdint.h> |
| |
| #include "libavutil/channel_layout.h" |
| |
| #include "get_bits.h" |
| |
| typedef struct MLPHeaderInfo |
| { |
| int stream_type; ///< 0xBB for MLP, 0xBA for TrueHD |
| int header_size; ///< Size of the major sync header, in bytes |
| |
| int group1_bits; ///< The bit depth of the first substream |
| int group2_bits; ///< Bit depth of the second substream (MLP only) |
| |
| int group1_samplerate; ///< Sample rate of first substream |
| int group2_samplerate; ///< Sample rate of second substream (MLP only) |
| |
| int channel_arrangement; |
| |
| int channel_modifier_thd_stream0; ///< Channel modifier for substream 0 of TrueHD streams ("2-channel presentation") |
| int channel_modifier_thd_stream1; ///< Channel modifier for substream 1 of TrueHD streams ("6-channel presentation") |
| int channel_modifier_thd_stream2; ///< Channel modifier for substream 2 of TrueHD streams ("8-channel presentation") |
| |
| int channels_mlp; ///< Channel count for MLP streams |
| int channels_thd_stream1; ///< Channel count for substream 1 of TrueHD streams ("6-channel presentation") |
| int channels_thd_stream2; ///< Channel count for substream 2 of TrueHD streams ("8-channel presentation") |
| uint64_t channel_layout_mlp; ///< Channel layout for MLP streams |
| uint64_t channel_layout_thd_stream1; ///< Channel layout for substream 1 of TrueHD streams ("6-channel presentation") |
| uint64_t channel_layout_thd_stream2; ///< Channel layout for substream 2 of TrueHD streams ("8-channel presentation") |
| |
| int access_unit_size; ///< Number of samples per coded frame |
| int access_unit_size_pow2; ///< Next power of two above number of samples per frame |
| |
| int is_vbr; ///< Stream is VBR instead of CBR |
| int peak_bitrate; ///< Peak bitrate for VBR, actual bitrate (==peak) for CBR |
| |
| int num_substreams; ///< Number of substreams within stream |
| |
| int extended_substream_info; ///< Which substream of substreams carry 16-channel presentation |
| int substream_info; ///< Which substream of substreams carry 2/6/8-channel presentation |
| } MLPHeaderInfo; |
| |
| static const uint8_t thd_chancount[13] = { |
| // LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2 |
| 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1 |
| }; |
| |
| static const uint64_t thd_layout[13] = { |
| AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR |
| AV_CH_FRONT_CENTER, // C |
| AV_CH_LOW_FREQUENCY, // LFE |
| AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs |
| AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh |
| AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc |
| AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs |
| AV_CH_BACK_CENTER, // Cs |
| AV_CH_TOP_CENTER, // Ts |
| AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd |
| AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw |
| AV_CH_TOP_FRONT_CENTER, // Cvh |
| AV_CH_LOW_FREQUENCY_2, // LFE2 |
| }; |
| |
| static inline int mlp_samplerate(int in) |
| { |
| if (in == 0xF) |
| return 0; |
| |
| return (in & 8 ? 44100 : 48000) << (in & 7) ; |
| } |
| |
| static inline int truehd_channels(int chanmap) |
| { |
| int channels = 0, i; |
| |
| for (i = 0; i < 13; i++) |
| channels += thd_chancount[i] * ((chanmap >> i) & 1); |
| |
| return channels; |
| } |
| |
| static inline uint64_t truehd_layout(int chanmap) |
| { |
| int i; |
| uint64_t layout = 0; |
| |
| for (i = 0; i < 13; i++) |
| layout |= thd_layout[i] * ((chanmap >> i) & 1); |
| |
| return layout; |
| } |
| |
| static inline int layout_truehd(uint64_t layout) |
| { |
| int chanmap = 0; |
| |
| for (int i = 0; i < 13; i++) { |
| if ((layout & thd_layout[i]) == thd_layout[i]) |
| chanmap |= 1 << i; |
| } |
| |
| return chanmap; |
| } |
| |
| int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb); |
| |
| #endif /* AVCODEC_MLP_PARSE_H */ |
