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 "get_bits.h"
25
26 typedef struct MLPHeaderInfo
27 {
28 int stream_type; ///< 0xBB for MLP, 0xBA for TrueHD
29 int header_size; ///< Size of the major sync header, in bytes
30
31 int group1_bits; ///< The bit depth of the first substream
32 int group2_bits; ///< Bit depth of the second substream (MLP only)
33
34 int group1_samplerate; ///< Sample rate of first substream
35 int group2_samplerate; ///< Sample rate of second substream (MLP only)
36
37 int channel_arrangement;
38
39 int channel_modifier_thd_stream0; ///< Channel modifier for substream 0 of TrueHD streams ("2-channel presentation")
40 int channel_modifier_thd_stream1; ///< Channel modifier for substream 1 of TrueHD streams ("6-channel presentation")
41 int channel_modifier_thd_stream2; ///< Channel modifier for substream 2 of TrueHD streams ("8-channel presentation")
42
43 int channels_mlp; ///< Channel count for MLP streams
44 int channels_thd_stream1; ///< Channel count for substream 1 of TrueHD streams ("6-channel presentation")
45 int channels_thd_stream2; ///< Channel count for substream 2 of TrueHD streams ("8-channel presentation")
46 uint64_t channel_layout_mlp; ///< Channel layout for MLP streams
47 uint64_t channel_layout_thd_stream1; ///< Channel layout for substream 1 of TrueHD streams ("6-channel presentation")
48 uint64_t channel_layout_thd_stream2; ///< Channel layout for substream 2 of TrueHD streams ("8-channel presentation")
49
50 int access_unit_size; ///< Number of samples per coded frame
51 int access_unit_size_pow2; ///< Next power of two above number of samples per frame
52
53 int is_vbr; ///< Stream is VBR instead of CBR
54 int peak_bitrate; ///< Peak bitrate for VBR, actual bitrate (==peak) for CBR
55
56 int num_substreams; ///< Number of substreams within stream
57 } MLPHeaderInfo;
58
59 static const uint8_t thd_chancount[13] = {
60 // LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2
61 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1
62 };
63
64 static const uint64_t thd_layout[13] = {
65 AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR
66 AV_CH_FRONT_CENTER, // C
67 AV_CH_LOW_FREQUENCY, // LFE
68 AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs
69 AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh
70 AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc
71 AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs
72 AV_CH_BACK_CENTER, // Cs
73 AV_CH_TOP_CENTER, // Ts
74 AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd
75 AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw
76 AV_CH_TOP_FRONT_CENTER, // Cvh
77 AV_CH_LOW_FREQUENCY_2, // LFE2
78 };
79
mlp_samplerate(int in)80 static inline int mlp_samplerate(int in)
81 {
82 if (in == 0xF)
83 return 0;
84
85 return (in & 8 ? 44100 : 48000) << (in & 7) ;
86 }
87
truehd_channels(int chanmap)88 static inline int truehd_channels(int chanmap)
89 {
90 int channels = 0, i;
91
92 for (i = 0; i < 13; i++)
93 channels += thd_chancount[i] * ((chanmap >> i) & 1);
94
95 return channels;
96 }
97
truehd_layout(int chanmap)98 static inline uint64_t truehd_layout(int chanmap)
99 {
100 int i;
101 uint64_t layout = 0;
102
103 for (i = 0; i < 13; i++)
104 layout |= thd_layout[i] * ((chanmap >> i) & 1);
105
106 return layout;
107 }
108
109 int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb);
110
111 #endif /* AVCODEC_MLP_PARSE_H */
112