FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mlp_parse.h
Date: 2024-07-16 12:46:59
Exec Total Coverage
Lines: 14 20 70.0%
Functions: 3 4 75.0%
Branches: 8 12 66.7%

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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
30 typedef 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
62 int extended_substream_info; ///< Which substream of substreams carry 16-channel presentation
63 int substream_info; ///< Which substream of substreams carry 2/6/8-channel presentation
64 } MLPHeaderInfo;
65
66 static const uint8_t thd_chancount[13] = {
67 // LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2
68 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1
69 };
70
71 static const uint64_t thd_layout[13] = {
72 AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR
73 AV_CH_FRONT_CENTER, // C
74 AV_CH_LOW_FREQUENCY, // LFE
75 AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs
76 AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh
77 AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc
78 AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs
79 AV_CH_BACK_CENTER, // Cs
80 AV_CH_TOP_CENTER, // Ts
81 AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd
82 AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw
83 AV_CH_TOP_FRONT_CENTER, // Cvh
84 AV_CH_LOW_FREQUENCY_2, // LFE2
85 };
86
87 8010 static inline int mlp_samplerate(int in)
88 {
89
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8010 if (in == 0xF)
90 3347 return 0;
91
92
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4663 return (in & 8 ? 44100 : 48000) << (in & 7) ;
93 }
94
95 2620 static inline int truehd_channels(int chanmap)
96 {
97 2620 int channels = 0, i;
98
99
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36680 for (i = 0; i < 13; i++)
100 34060 channels += thd_chancount[i] * ((chanmap >> i) & 1);
101
102 2620 return channels;
103 }
104
105 2620 static inline uint64_t truehd_layout(int chanmap)
106 {
107 int i;
108 2620 uint64_t layout = 0;
109
110
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36680 for (i = 0; i < 13; i++)
111 34060 layout |= thd_layout[i] * ((chanmap >> i) & 1);
112
113 2620 return layout;
114 }
115
116 static inline int layout_truehd(uint64_t layout)
117 {
118 int chanmap = 0;
119
120 for (int i = 0; i < 13; i++) {
121 if ((layout & thd_layout[i]) == thd_layout[i])
122 chanmap |= 1 << i;
123 }
124
125 return chanmap;
126 }
127
128 int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb);
129
130 #endif /* AVCODEC_MLP_PARSE_H */
131