FFmpeg
mlp_parse.h
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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 
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 
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
62 
63 static 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 
68 static const uint64_t thd_layout[13] = {
70  AV_CH_FRONT_CENTER, // C
71  AV_CH_LOW_FREQUENCY, // LFE
76  AV_CH_BACK_CENTER, // Cs
77  AV_CH_TOP_CENTER, // Ts
81  AV_CH_LOW_FREQUENCY_2, // LFE2
82 };
83 
84 static 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 
92 static 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 
102 static 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 
114 
115 #endif /* AVCODEC_MLP_PARSE_H */
MLPHeaderInfo::channel_arrangement
int channel_arrangement
Definition: mlp_parse.h:41
AV_CH_TOP_FRONT_CENTER
#define AV_CH_TOP_FRONT_CENTER
Definition: channel_layout.h:171
AV_CH_LOW_FREQUENCY_2
#define AV_CH_LOW_FREQUENCY_2
Definition: channel_layout.h:182
MLPHeaderInfo::group1_samplerate
int group1_samplerate
Sample rate of first substream.
Definition: mlp_parse.h:38
AV_CH_TOP_FRONT_RIGHT
#define AV_CH_TOP_FRONT_RIGHT
Definition: channel_layout.h:172
MLPHeaderInfo::channel_layout_thd_stream2
uint64_t channel_layout_thd_stream2
Channel layout for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parse.h:52
truehd_channels
static int truehd_channels(int chanmap)
Definition: mlp_parse.h:92
mh
#define mh
Definition: vf_colormatrix.c:107
AV_CH_TOP_FRONT_LEFT
#define AV_CH_TOP_FRONT_LEFT
Definition: channel_layout.h:170
AV_CH_WIDE_LEFT
#define AV_CH_WIDE_LEFT
Definition: channel_layout.h:178
AV_CH_SURROUND_DIRECT_RIGHT
#define AV_CH_SURROUND_DIRECT_RIGHT
Definition: channel_layout.h:181
AV_CH_WIDE_RIGHT
#define AV_CH_WIDE_RIGHT
Definition: channel_layout.h:179
GetBitContext
Definition: get_bits.h:61
AV_CH_BACK_LEFT
#define AV_CH_BACK_LEFT
Definition: channel_layout.h:162
MLPHeaderInfo::channels_thd_stream1
int channels_thd_stream1
Channel count for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parse.h:48
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:161
MLPHeaderInfo::channels_thd_stream2
int channels_thd_stream2
Channel count for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parse.h:49
MLPHeaderInfo::access_unit_size
int access_unit_size
Number of samples per coded frame.
Definition: mlp_parse.h:54
channels
channels
Definition: aptx.h:32
get_bits.h
MLPHeaderInfo::channel_modifier_thd_stream0
int channel_modifier_thd_stream0
Channel modifier for substream 0 of TrueHD streams ("2-channel presentation")
Definition: mlp_parse.h:43
MLPHeaderInfo::stream_type
int stream_type
0xBB for MLP, 0xBA for TrueHD
Definition: mlp_parse.h:32
MLPHeaderInfo::access_unit_size_pow2
int access_unit_size_pow2
Next power of two above number of samples per frame.
Definition: mlp_parse.h:55
MLPHeaderInfo::peak_bitrate
int peak_bitrate
Peak bitrate for VBR, actual bitrate (==peak) for CBR.
Definition: mlp_parse.h:58
AV_CH_TOP_CENTER
#define AV_CH_TOP_CENTER
Definition: channel_layout.h:169
truehd_layout
static uint64_t truehd_layout(int chanmap)
Definition: mlp_parse.h:102
AV_CH_FRONT_CENTER
#define AV_CH_FRONT_CENTER
Definition: channel_layout.h:160
AV_CH_FRONT_LEFT_OF_CENTER
#define AV_CH_FRONT_LEFT_OF_CENTER
Definition: channel_layout.h:164
MLPHeaderInfo::channels_mlp
int channels_mlp
Channel count for MLP streams.
Definition: mlp_parse.h:47
MLPHeaderInfo::channel_layout_thd_stream1
uint64_t channel_layout_thd_stream1
Channel layout for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parse.h:51
MLPHeaderInfo::group2_bits
int group2_bits
Bit depth of the second substream (MLP only)
Definition: mlp_parse.h:36
AV_CH_FRONT_RIGHT_OF_CENTER
#define AV_CH_FRONT_RIGHT_OF_CENTER
Definition: channel_layout.h:165
MLPHeaderInfo::header_size
int header_size
Size of the major sync header, in bytes.
Definition: mlp_parse.h:33
MLPHeaderInfo::group1_bits
int group1_bits
The bit depth of the first substream.
Definition: mlp_parse.h:35
layout
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel layout
Definition: filter_design.txt:18
ff_mlp_read_major_sync
int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
Read a major sync info header - contains high level information about the stream - sample rate,...
Definition: mlp_parse.c:86
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AV_CH_BACK_CENTER
#define AV_CH_BACK_CENTER
Definition: channel_layout.h:166
MLPHeaderInfo
Definition: mlp_parse.h:30
AV_CH_FRONT_LEFT
#define AV_CH_FRONT_LEFT
Definition: channel_layout.h:158
AV_CH_SIDE_RIGHT
#define AV_CH_SIDE_RIGHT
Definition: channel_layout.h:168
thd_layout
static const uint64_t thd_layout[13]
Definition: mlp_parse.h:68
MLPHeaderInfo::is_vbr
int is_vbr
Stream is VBR instead of CBR.
Definition: mlp_parse.h:57
MLPHeaderInfo::channel_modifier_thd_stream2
int channel_modifier_thd_stream2
Channel modifier for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parse.h:45
mlp_samplerate
static int mlp_samplerate(int in)
Definition: mlp_parse.h:84
channel_layout.h
MLPHeaderInfo::channel_modifier_thd_stream1
int channel_modifier_thd_stream1
Channel modifier for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parse.h:44
MLPHeaderInfo::group2_samplerate
int group2_samplerate
Sample rate of second substream (MLP only)
Definition: mlp_parse.h:39
AV_CH_SURROUND_DIRECT_LEFT
#define AV_CH_SURROUND_DIRECT_LEFT
Definition: channel_layout.h:180
MLPHeaderInfo::num_substreams
int num_substreams
Number of substreams within stream.
Definition: mlp_parse.h:60
MLPHeaderInfo::channel_layout_mlp
uint64_t channel_layout_mlp
Channel layout for MLP streams.
Definition: mlp_parse.h:50
AV_CH_FRONT_RIGHT
#define AV_CH_FRONT_RIGHT
Definition: channel_layout.h:159
AV_CH_BACK_RIGHT
#define AV_CH_BACK_RIGHT
Definition: channel_layout.h:163
AV_CH_SIDE_LEFT
#define AV_CH_SIDE_LEFT
Definition: channel_layout.h:167
thd_chancount
static const uint8_t thd_chancount[13]
Definition: mlp_parse.h:63