2 * MPEG-4 Audio common header
3 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVCODEC_MPEG4AUDIO_H
23 #define AVCODEC_MPEG4AUDIO_H
27 #include "libavutil/attributes.h"
32 typedef struct MPEG4AudioConfig {
37 int sbr; ///< -1 implicit, 1 presence
39 int ext_sampling_index;
43 int ps; ///< -1 implicit, 1 presence
44 int frame_length_short;
47 extern av_export const int avpriv_mpeg4audio_sample_rates[16];
48 extern const uint8_t ff_mpeg4audio_channels[8];
51 * Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration.
52 * @param[in] c MPEG4AudioConfig structure to fill.
53 * @param[in] gb Extradata from container.
54 * @param[in] sync_extension look for a sync extension after config if true.
55 * @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
57 int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb,
61 * Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
62 * @param[in] c MPEG4AudioConfig structure to fill.
63 * @param[in] buf Extradata from container.
64 * @param[in] bit_size Extradata size in bits.
65 * @param[in] sync_extension look for a sync extension after config if true.
66 * @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
68 int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
69 int bit_size, int sync_extension);
71 enum AudioObjectType {
74 AOT_AAC_MAIN, ///< Y Main
75 AOT_AAC_LC, ///< Y Low Complexity
76 AOT_AAC_SSR, ///< N (code in SoC repo) Scalable Sample Rate
77 AOT_AAC_LTP, ///< Y Long Term Prediction
78 AOT_SBR, ///< Y Spectral Band Replication
79 AOT_AAC_SCALABLE, ///< N Scalable
80 AOT_TWINVQ, ///< N Twin Vector Quantizer
81 AOT_CELP, ///< N Code Excited Linear Prediction
82 AOT_HVXC, ///< N Harmonic Vector eXcitation Coding
83 AOT_TTSI = 12, ///< N Text-To-Speech Interface
84 AOT_MAINSYNTH, ///< N Main Synthesis
85 AOT_WAVESYNTH, ///< N Wavetable Synthesis
86 AOT_MIDI, ///< N General MIDI
87 AOT_SAFX, ///< N Algorithmic Synthesis and Audio Effects
88 AOT_ER_AAC_LC, ///< N Error Resilient Low Complexity
89 AOT_ER_AAC_LTP = 19, ///< N Error Resilient Long Term Prediction
90 AOT_ER_AAC_SCALABLE, ///< N Error Resilient Scalable
91 AOT_ER_TWINVQ, ///< N Error Resilient Twin Vector Quantizer
92 AOT_ER_BSAC, ///< N Error Resilient Bit-Sliced Arithmetic Coding
93 AOT_ER_AAC_LD, ///< N Error Resilient Low Delay
94 AOT_ER_CELP, ///< N Error Resilient Code Excited Linear Prediction
95 AOT_ER_HVXC, ///< N Error Resilient Harmonic Vector eXcitation Coding
96 AOT_ER_HILN, ///< N Error Resilient Harmonic and Individual Lines plus Noise
97 AOT_ER_PARAM, ///< N Error Resilient Parametric
98 AOT_SSC, ///< N SinuSoidal Coding
99 AOT_PS, ///< N Parametric Stereo
100 AOT_SURROUND, ///< N MPEG Surround
101 AOT_ESCAPE, ///< Y Escape Value
102 AOT_L1, ///< Y Layer 1
103 AOT_L2, ///< Y Layer 2
104 AOT_L3, ///< Y Layer 3
105 AOT_DST, ///< N Direct Stream Transfer
106 AOT_ALS, ///< Y Audio LosslesS
107 AOT_SLS, ///< N Scalable LosslesS
108 AOT_SLS_NON_CORE, ///< N Scalable LosslesS (non core)
109 AOT_ER_AAC_ELD, ///< N Error Resilient Enhanced Low Delay
110 AOT_SMR_SIMPLE, ///< N Symbolic Music Representation Simple
111 AOT_SMR_MAIN, ///< N Symbolic Music Representation Main
112 AOT_USAC_NOSBR, ///< N Unified Speech and Audio Coding (no SBR)
113 AOT_SAOC, ///< N Spatial Audio Object Coding
114 AOT_LD_SURROUND, ///< N Low Delay MPEG Surround
115 AOT_USAC, ///< N Unified Speech and Audio Coding
118 #define MAX_PCE_SIZE 320 ///<Maximum size of a PCE including the 3-bit ID_PCE
119 ///<marker and the comment
121 static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb,
125 unsigned int el = get_bits(gb, bits);
126 put_bits(pb, bits, el);
130 static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
132 int five_bit_ch, four_bit_ch, comment_size, bits;
133 int offset = put_bits_count(pb);
135 ff_pce_copy_bits(pb, gb, 10); // Tag, Object Type, Frequency
136 five_bit_ch = ff_pce_copy_bits(pb, gb, 4); // Front
137 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side
138 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back
139 four_bit_ch = ff_pce_copy_bits(pb, gb, 2); // LFE
140 four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data
141 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling
142 if (ff_pce_copy_bits(pb, gb, 1)) // Mono Mixdown
143 ff_pce_copy_bits(pb, gb, 4);
144 if (ff_pce_copy_bits(pb, gb, 1)) // Stereo Mixdown
145 ff_pce_copy_bits(pb, gb, 4);
146 if (ff_pce_copy_bits(pb, gb, 1)) // Matrix Mixdown
147 ff_pce_copy_bits(pb, gb, 3);
148 for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
149 ff_pce_copy_bits(pb, gb, 16);
151 ff_pce_copy_bits(pb, gb, bits);
152 avpriv_align_put_bits(pb);
154 comment_size = ff_pce_copy_bits(pb, gb, 8);
155 for (; comment_size > 0; comment_size--)
156 ff_pce_copy_bits(pb, gb, 8);
158 return put_bits_count(pb) - offset;
161 #endif /* AVCODEC_MPEG4AUDIO_H */