FFmpeg  4.3.9
mlp_parse.h
Go to the documentation of this file.
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 
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
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] = {
66  AV_CH_FRONT_CENTER, // C
67  AV_CH_LOW_FREQUENCY, // LFE
72  AV_CH_BACK_CENTER, // Cs
73  AV_CH_TOP_CENTER, // Ts
77  AV_CH_LOW_FREQUENCY_2, // LFE2
78 };
79 
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 
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 
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 
110 
111 #endif /* AVCODEC_MLP_PARSE_H */
int channels_thd_stream1
Channel count for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parse.h:44
#define AV_CH_TOP_FRONT_RIGHT
#define AV_CH_TOP_FRONT_LEFT
int num_substreams
Number of substreams within stream.
Definition: mlp_parse.h:56
#define AV_CH_TOP_FRONT_CENTER
#define AV_CH_LOW_FREQUENCY_2
uint64_t channel_layout_mlp
Channel layout for MLP streams.
Definition: mlp_parse.h:46
#define AV_CH_SURROUND_DIRECT_RIGHT
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
int access_unit_size
Number of samples per coded frame.
Definition: mlp_parse.h:50
int peak_bitrate
Peak bitrate for VBR, actual bitrate (==peak) for CBR.
Definition: mlp_parse.h:54
#define AV_CH_WIDE_LEFT
uint8_t
int channel_modifier_thd_stream0
Channel modifier for substream 0 of TrueHD streams ("2-channel presentation")
Definition: mlp_parse.h:39
#define AV_CH_WIDE_RIGHT
#define AV_CH_LOW_FREQUENCY
bitstream reader API header.
#define AV_CH_BACK_LEFT
int channel_arrangement
Definition: mlp_parse.h:37
channels
Definition: aptx.h:33
static int mlp_samplerate(int in)
Definition: mlp_parse.h:80
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
int channel_modifier_thd_stream2
Channel modifier for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parse.h:41
int channels_mlp
Channel count for MLP streams.
Definition: mlp_parse.h:43
static const uint8_t thd_chancount[13]
Definition: mlp_parse.h:59
#define AV_CH_TOP_CENTER
int is_vbr
Stream is VBR instead of CBR.
Definition: mlp_parse.h:53
#define AV_CH_FRONT_LEFT_OF_CENTER
static uint64_t truehd_layout(int chanmap)
Definition: mlp_parse.h:98
#define AV_CH_FRONT_CENTER
#define AV_CH_FRONT_RIGHT_OF_CENTER
int stream_type
0xBB for MLP, 0xBA for TrueHD
Definition: mlp_parse.h:28
int access_unit_size_pow2
Next power of two above number of samples per frame.
Definition: mlp_parse.h:51
int channel_modifier_thd_stream1
Channel modifier for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parse.h:40
#define AV_CH_FRONT_LEFT
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
static int truehd_channels(int chanmap)
Definition: mlp_parse.h:88
int group2_bits
Bit depth of the second substream (MLP only)
Definition: mlp_parse.h:32
#define AV_CH_BACK_CENTER
#define AV_CH_SIDE_RIGHT
int channels_thd_stream2
Channel count for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parse.h:45
static const uint64_t thd_layout[13]
Definition: mlp_parse.h:64
uint64_t channel_layout_thd_stream1
Channel layout for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parse.h:47
uint64_t channel_layout_thd_stream2
Channel layout for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parse.h:48
int header_size
Size of the major sync header, in bytes.
Definition: mlp_parse.h:29
int group1_bits
The bit depth of the first substream.
Definition: mlp_parse.h:31
uint64_t layout
#define AV_CH_SURROUND_DIRECT_LEFT
#define AV_CH_FRONT_RIGHT
#define AV_CH_SIDE_LEFT
int group1_samplerate
Sample rate of first substream.
Definition: mlp_parse.h:34
int group2_samplerate
Sample rate of second substream (MLP only)
Definition: mlp_parse.h:35
#define mh
#define AV_CH_BACK_RIGHT