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mlp_parser.h
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1 /*
2  * MLP parser prototypes
3  * Copyright (c) 2007 Ian Caulfield
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * MLP parser prototypes
25  */
26 
27 #ifndef AVCODEC_MLP_PARSER_H
28 #define AVCODEC_MLP_PARSER_H
29 
30 #include "get_bits.h"
31 
32 typedef struct MLPHeaderInfo
33 {
34  int stream_type; ///< 0xBB for MLP, 0xBA for TrueHD
35  int header_size; ///< Size of the major sync header, in bytes
36 
37  int group1_bits; ///< The bit depth of the first substream
38  int group2_bits; ///< Bit depth of the second substream (MLP only)
39 
40  int group1_samplerate; ///< Sample rate of first substream
41  int group2_samplerate; ///< Sample rate of second substream (MLP only)
42 
43  int channel_arrangement;
44 
45  int channel_modifier_thd_stream0; ///< Channel modifier for substream 0 of TrueHD sreams ("2-channel presentation")
46  int channel_modifier_thd_stream1; ///< Channel modifier for substream 1 of TrueHD sreams ("6-channel presentation")
47  int channel_modifier_thd_stream2; ///< Channel modifier for substream 2 of TrueHD sreams ("8-channel presentation")
48 
49  int channels_mlp; ///< Channel count for MLP streams
50  int channels_thd_stream1; ///< Channel count for substream 1 of TrueHD streams ("6-channel presentation")
51  int channels_thd_stream2; ///< Channel count for substream 2 of TrueHD streams ("8-channel presentation")
52  uint64_t channel_layout_mlp; ///< Channel layout for MLP streams
53  uint64_t channel_layout_thd_stream1; ///< Channel layout for substream 1 of TrueHD streams ("6-channel presentation")
54  uint64_t channel_layout_thd_stream2; ///< Channel layout for substream 2 of TrueHD streams ("8-channel presentation")
55 
56  int access_unit_size; ///< Number of samples per coded frame
57  int access_unit_size_pow2; ///< Next power of two above number of samples per frame
58 
59  int is_vbr; ///< Stream is VBR instead of CBR
60  int peak_bitrate; ///< Peak bitrate for VBR, actual bitrate (==peak) for CBR
61 
62  int num_substreams; ///< Number of substreams within stream
63 } MLPHeaderInfo;
64 
65 
66 int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb);
67 uint64_t ff_truehd_layout(int chanmap);
68 
69 extern const uint64_t ff_mlp_layout[32];
70 
71 #endif /* AVCODEC_MLP_PARSER_H */
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