1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
* 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
} 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;
}
int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb);
#endif /* AVCODEC_MLP_PARSE_H */
|
