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 {
34 int object_type;
35 int sampling_index;
36 int sample_rate;
37 int chan_config;
38 int sbr; ///< -1 implicit, 1 presence
39 int ext_object_type;
40 int ext_sampling_index;
41 int ext_sample_rate;
42 int ext_chan_config;
43 int channels;
44 int ps; ///< -1 implicit, 1 presence
45 int frame_length_short;
46 } MPEG4AudioConfig;
47
48 extern av_export_avcodec const int avpriv_mpeg4audio_sample_rates[16];
49 extern const uint8_t ff_mpeg4audio_channels[14];
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 * @param[in] logctx opaque struct starting with an AVClass element, used for logging.
57 * @return negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata.
58 */
59 int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb,
60 int sync_extension, void *logctx);
61
62 #if LIBAVCODEC_VERSION_MAJOR < 59
63 /**
64 * Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
65 * @param[in] c MPEG4AudioConfig structure to fill.
66 * @param[in] buf Extradata from container.
67 * @param[in] bit_size Extradata size in bits.
68 * @param[in] sync_extension look for a sync extension after config if true.
69 * @return negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata.
70 */
71 int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
72 int bit_size, int sync_extension);
73 #endif
74
75 /**
76 * Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
77 * @param[in] c MPEG4AudioConfig structure to fill.
78 * @param[in] buf Extradata from container.
79 * @param[in] size Extradata size in bytes.
80 * @param[in] sync_extension look for a sync extension after config if true.
81 * @param[in] logctx opaque struct starting with an AVClass element, used for logging.
82 * @return negative AVERROR code on error, AudioSpecificConfig bit index in extradata on success.
83 */
84 int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf,
85 int size, int sync_extension, void *logctx);
86
87 enum AudioObjectType {
88 AOT_NULL,
89 // Support? Name
90 AOT_AAC_MAIN, ///< Y Main
91 AOT_AAC_LC, ///< Y Low Complexity
92 AOT_AAC_SSR, ///< N (code in SoC repo) Scalable Sample Rate
93 AOT_AAC_LTP, ///< Y Long Term Prediction
94 AOT_SBR, ///< Y Spectral Band Replication
95 AOT_AAC_SCALABLE, ///< N Scalable
96 AOT_TWINVQ, ///< N Twin Vector Quantizer
97 AOT_CELP, ///< N Code Excited Linear Prediction
98 AOT_HVXC, ///< N Harmonic Vector eXcitation Coding
99 AOT_TTSI = 12, ///< N Text-To-Speech Interface
100 AOT_MAINSYNTH, ///< N Main Synthesis
101 AOT_WAVESYNTH, ///< N Wavetable Synthesis
102 AOT_MIDI, ///< N General MIDI
103 AOT_SAFX, ///< N Algorithmic Synthesis and Audio Effects
104 AOT_ER_AAC_LC, ///< N Error Resilient Low Complexity
105 AOT_ER_AAC_LTP = 19, ///< N Error Resilient Long Term Prediction
106 AOT_ER_AAC_SCALABLE, ///< N Error Resilient Scalable
107 AOT_ER_TWINVQ, ///< N Error Resilient Twin Vector Quantizer
108 AOT_ER_BSAC, ///< N Error Resilient Bit-Sliced Arithmetic Coding
109 AOT_ER_AAC_LD, ///< N Error Resilient Low Delay
110 AOT_ER_CELP, ///< N Error Resilient Code Excited Linear Prediction
111 AOT_ER_HVXC, ///< N Error Resilient Harmonic Vector eXcitation Coding
112 AOT_ER_HILN, ///< N Error Resilient Harmonic and Individual Lines plus Noise
113 AOT_ER_PARAM, ///< N Error Resilient Parametric
114 AOT_SSC, ///< N SinuSoidal Coding
115 AOT_PS, ///< N Parametric Stereo
116 AOT_SURROUND, ///< N MPEG Surround
117 AOT_ESCAPE, ///< Y Escape Value
118 AOT_L1, ///< Y Layer 1
119 AOT_L2, ///< Y Layer 2
120 AOT_L3, ///< Y Layer 3
121 AOT_DST, ///< N Direct Stream Transfer
122 AOT_ALS, ///< Y Audio LosslesS
123 AOT_SLS, ///< N Scalable LosslesS
124 AOT_SLS_NON_CORE, ///< N Scalable LosslesS (non core)
125 AOT_ER_AAC_ELD, ///< N Error Resilient Enhanced Low Delay
126 AOT_SMR_SIMPLE, ///< N Symbolic Music Representation Simple
127 AOT_SMR_MAIN, ///< N Symbolic Music Representation Main
128 AOT_USAC_NOSBR, ///< N Unified Speech and Audio Coding (no SBR)
129 AOT_SAOC, ///< N Spatial Audio Object Coding
130 AOT_LD_SURROUND, ///< N Low Delay MPEG Surround
131 AOT_USAC, ///< N Unified Speech and Audio Coding
132 };
133
134 #define MAX_PCE_SIZE 320 ///<Maximum size of a PCE including the 3-bit ID_PCE
135 ///<marker and the comment
136
ff_pce_copy_bits(PutBitContext * pb,GetBitContext * gb,int bits)137 static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb,
138 GetBitContext *gb,
139 int bits)
140 {
141 unsigned int el = get_bits(gb, bits);
142 put_bits(pb, bits, el);
143 return el;
144 }
145
ff_copy_pce_data(PutBitContext * pb,GetBitContext * gb)146 static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
147 {
148 int five_bit_ch, four_bit_ch, comment_size, bits;
149 int offset = put_bits_count(pb);
150
151 ff_pce_copy_bits(pb, gb, 10); // Tag, Object Type, Frequency
152 five_bit_ch = ff_pce_copy_bits(pb, gb, 4); // Front
153 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side
154 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back
155 four_bit_ch = ff_pce_copy_bits(pb, gb, 2); // LFE
156 four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data
157 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling
158 if (ff_pce_copy_bits(pb, gb, 1)) // Mono Mixdown
159 ff_pce_copy_bits(pb, gb, 4);
160 if (ff_pce_copy_bits(pb, gb, 1)) // Stereo Mixdown
161 ff_pce_copy_bits(pb, gb, 4);
162 if (ff_pce_copy_bits(pb, gb, 1)) // Matrix Mixdown
163 ff_pce_copy_bits(pb, gb, 3);
164 for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
165 ff_pce_copy_bits(pb, gb, 16);
166 if (bits)
167 ff_pce_copy_bits(pb, gb, bits);
168 align_put_bits(pb);
169 align_get_bits(gb);
170 comment_size = ff_pce_copy_bits(pb, gb, 8);
171 for (; comment_size > 0; comment_size--)
172 ff_pce_copy_bits(pb, gb, 8);
173
174 return put_bits_count(pb) - offset;
175 }
176
177 #endif /* AVCODEC_MPEG4AUDIO_H */
178