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mpeg4audio.h
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1 /*
2  * MPEG-4 Audio common header
3  * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
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 #ifndef AVCODEC_MPEG4AUDIO_H
23 #define AVCODEC_MPEG4AUDIO_H
24 
25 #include <stdint.h>
26 
27 #include "libavutil/attributes.h"
28 
29 #include "get_bits.h"
30 #include "internal.h"
31 #include "put_bits.h"
32 
33 typedef struct MPEG4AudioConfig {
38  int sbr; ///< -1 implicit, 1 presence
43  int channels;
44  int ps; ///< -1 implicit, 1 presence
47 
49 extern const uint8_t ff_mpeg4audio_channels[8];
50 
51 /**
52  * Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration.
53  * @param[in] c MPEG4AudioConfig structure to fill.
54  * @param[in] gb Extradata from container.
55  * @param[in] sync_extension look for a sync extension after config if true.
56  * @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
57  */
59  int sync_extension);
60 
61 /**
62  * Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
63  * @param[in] c MPEG4AudioConfig structure to fill.
64  * @param[in] buf Extradata from container.
65  * @param[in] bit_size Extradata size in bits.
66  * @param[in] sync_extension look for a sync extension after config if true.
67  * @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
68  */
70  int bit_size, int sync_extension);
71 
74  // Support? Name
75  AOT_AAC_MAIN, ///< Y Main
76  AOT_AAC_LC, ///< Y Low Complexity
77  AOT_AAC_SSR, ///< N (code in SoC repo) Scalable Sample Rate
78  AOT_AAC_LTP, ///< Y Long Term Prediction
79  AOT_SBR, ///< Y Spectral Band Replication
80  AOT_AAC_SCALABLE, ///< N Scalable
81  AOT_TWINVQ, ///< N Twin Vector Quantizer
82  AOT_CELP, ///< N Code Excited Linear Prediction
83  AOT_HVXC, ///< N Harmonic Vector eXcitation Coding
84  AOT_TTSI = 12, ///< N Text-To-Speech Interface
85  AOT_MAINSYNTH, ///< N Main Synthesis
86  AOT_WAVESYNTH, ///< N Wavetable Synthesis
87  AOT_MIDI, ///< N General MIDI
88  AOT_SAFX, ///< N Algorithmic Synthesis and Audio Effects
89  AOT_ER_AAC_LC, ///< N Error Resilient Low Complexity
90  AOT_ER_AAC_LTP = 19, ///< N Error Resilient Long Term Prediction
91  AOT_ER_AAC_SCALABLE, ///< N Error Resilient Scalable
92  AOT_ER_TWINVQ, ///< N Error Resilient Twin Vector Quantizer
93  AOT_ER_BSAC, ///< N Error Resilient Bit-Sliced Arithmetic Coding
94  AOT_ER_AAC_LD, ///< N Error Resilient Low Delay
95  AOT_ER_CELP, ///< N Error Resilient Code Excited Linear Prediction
96  AOT_ER_HVXC, ///< N Error Resilient Harmonic Vector eXcitation Coding
97  AOT_ER_HILN, ///< N Error Resilient Harmonic and Individual Lines plus Noise
98  AOT_ER_PARAM, ///< N Error Resilient Parametric
99  AOT_SSC, ///< N SinuSoidal Coding
100  AOT_PS, ///< N Parametric Stereo
101  AOT_SURROUND, ///< N MPEG Surround
102  AOT_ESCAPE, ///< Y Escape Value
103  AOT_L1, ///< Y Layer 1
104  AOT_L2, ///< Y Layer 2
105  AOT_L3, ///< Y Layer 3
106  AOT_DST, ///< N Direct Stream Transfer
107  AOT_ALS, ///< Y Audio LosslesS
108  AOT_SLS, ///< N Scalable LosslesS
109  AOT_SLS_NON_CORE, ///< N Scalable LosslesS (non core)
110  AOT_ER_AAC_ELD, ///< N Error Resilient Enhanced Low Delay
111  AOT_SMR_SIMPLE, ///< N Symbolic Music Representation Simple
112  AOT_SMR_MAIN, ///< N Symbolic Music Representation Main
113  AOT_USAC_NOSBR, ///< N Unified Speech and Audio Coding (no SBR)
114  AOT_SAOC, ///< N Spatial Audio Object Coding
115  AOT_LD_SURROUND, ///< N Low Delay MPEG Surround
116  AOT_USAC, ///< N Unified Speech and Audio Coding
117 };
118 
119 #define MAX_PCE_SIZE 320 ///<Maximum size of a PCE including the 3-bit ID_PCE
120  ///<marker and the comment
121 
123  GetBitContext *gb,
124  int bits)
125 {
126  unsigned int el = get_bits(gb, bits);
127  put_bits(pb, bits, el);
128  return el;
129 }
130 
131 static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
132 {
133  int five_bit_ch, four_bit_ch, comment_size, bits;
134  int offset = put_bits_count(pb);
135 
136  ff_pce_copy_bits(pb, gb, 10); // Tag, Object Type, Frequency
137  five_bit_ch = ff_pce_copy_bits(pb, gb, 4); // Front
138  five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side
139  five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back
140  four_bit_ch = ff_pce_copy_bits(pb, gb, 2); // LFE
141  four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data
142  five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling
143  if (ff_pce_copy_bits(pb, gb, 1)) // Mono Mixdown
144  ff_pce_copy_bits(pb, gb, 4);
145  if (ff_pce_copy_bits(pb, gb, 1)) // Stereo Mixdown
146  ff_pce_copy_bits(pb, gb, 4);
147  if (ff_pce_copy_bits(pb, gb, 1)) // Matrix Mixdown
148  ff_pce_copy_bits(pb, gb, 3);
149  for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
150  ff_pce_copy_bits(pb, gb, 16);
151  if (bits)
152  ff_pce_copy_bits(pb, gb, bits);
154  align_get_bits(gb);
155  comment_size = ff_pce_copy_bits(pb, gb, 8);
156  for (; comment_size > 0; comment_size--)
157  ff_pce_copy_bits(pb, gb, 8);
158 
159  return put_bits_count(pb) - offset;
160 }
161 
162 #endif /* AVCODEC_MPEG4AUDIO_H */
N Parametric Stereo.
Definition: mpeg4audio.h:100
Y Layer 1.
Definition: mpeg4audio.h:103
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:207
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
void avpriv_align_put_bits(PutBitContext *s)
Pad the bitstream with zeros up to the next byte boundary.
Definition: bitstream.c:48
static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb, GetBitContext *gb, int bits)
Definition: mpeg4audio.h:122
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int bit_size, int sync_extension)
Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. ...
Definition: mpeg4audio.c:155
Macro definitions for various function/variable attributes.
const uint8_t ff_mpeg4audio_channels[8]
Definition: mpeg4audio.c:67
N Scalable LosslesS (non core)
Definition: mpeg4audio.h:109
N Code Excited Linear Prediction.
Definition: mpeg4audio.h:82
N Error Resilient Parametric.
Definition: mpeg4audio.h:98
N Error Resilient Long Term Prediction.
Definition: mpeg4audio.h:90
N MPEG Surround.
Definition: mpeg4audio.h:101
uint8_t
N Error Resilient Low Delay.
Definition: mpeg4audio.h:94
int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb, int sync_extension)
Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configura...
Definition: mpeg4audio.c:86
N Algorithmic Synthesis and Audio Effects.
Definition: mpeg4audio.h:88
N Scalable LosslesS.
Definition: mpeg4audio.h:108
N General MIDI.
Definition: mpeg4audio.h:87
N Error Resilient Harmonic and Individual Lines plus Noise.
Definition: mpeg4audio.h:97
bitstream reader API header.
Y Escape Value.
Definition: mpeg4audio.h:102
N Error Resilient Low Complexity.
Definition: mpeg4audio.h:89
N Unified Speech and Audio Coding (no SBR)
Definition: mpeg4audio.h:113
N Symbolic Music Representation Main.
Definition: mpeg4audio.h:112
#define av_export_avcodec
Definition: internal.h:421
N Error Resilient Twin Vector Quantizer.
Definition: mpeg4audio.h:92
N Text-To-Speech Interface.
Definition: mpeg4audio.h:84
N Low Delay MPEG Surround.
Definition: mpeg4audio.h:115
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
av_export_avcodec const int avpriv_mpeg4audio_sample_rates[16]
Definition: mpeg4audio.c:62
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:85
N Error Resilient Scalable.
Definition: mpeg4audio.h:91
AudioObjectType
Definition: mpeg4audio.h:72
N Unified Speech and Audio Coding.
Definition: mpeg4audio.h:116
N Harmonic Vector eXcitation Coding.
Definition: mpeg4audio.h:83
N Error Resilient Harmonic Vector eXcitation Coding.
Definition: mpeg4audio.h:96
Y Main.
Definition: mpeg4audio.h:75
N Main Synthesis.
Definition: mpeg4audio.h:85
N (code in SoC repo) Scalable Sample Rate.
Definition: mpeg4audio.h:77
N Scalable.
Definition: mpeg4audio.h:80
N Direct Stream Transfer.
Definition: mpeg4audio.h:106
N Wavetable Synthesis.
Definition: mpeg4audio.h:86
N Error Resilient Code Excited Linear Prediction.
Definition: mpeg4audio.h:95
Y Layer 2.
Definition: mpeg4audio.h:104
void * buf
Definition: avisynth_c.h:690
static int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
Definition: mpeg4audio.h:131
N Error Resilient Bit-Sliced Arithmetic Coding.
Definition: mpeg4audio.h:93
int frame_length_short
Definition: mpeg4audio.h:45
N Error Resilient Enhanced Low Delay.
Definition: mpeg4audio.h:110
N Twin Vector Quantizer.
Definition: mpeg4audio.h:81
Y Spectral Band Replication.
Definition: mpeg4audio.h:79
common internal api header.
static double c[64]
N SinuSoidal Coding.
Definition: mpeg4audio.h:99
Y Audio LosslesS.
Definition: mpeg4audio.h:107
Y Layer 3.
Definition: mpeg4audio.h:105
Y Long Term Prediction.
Definition: mpeg4audio.h:78
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:464
N Symbolic Music Representation Simple.
Definition: mpeg4audio.h:111
int sbr
-1 implicit, 1 presence
Definition: mpeg4audio.h:38
#define av_always_inline
Definition: attributes.h:39
int ext_sampling_index
Definition: mpeg4audio.h:40
int ps
-1 implicit, 1 presence
Definition: mpeg4audio.h:44
N Spatial Audio Object Coding.
Definition: mpeg4audio.h:114
Y Low Complexity.
Definition: mpeg4audio.h:76
bitstream writer API