FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg4audio.h
Date: 2022-01-18 10:05:52
Exec Total Coverage
Lines: 24 29 82.8%
Branches: 6 12 50.0%

Line Branch Exec Source
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 "put_bits.h"
31
32 typedef struct MPEG4AudioConfig {
33 int object_type;
34 int sampling_index;
35 int sample_rate;
36 int chan_config;
37 int sbr; ///< -1 implicit, 1 presence
38 int ext_object_type;
39 int ext_sampling_index;
40 int ext_sample_rate;
41 int ext_chan_config;
42 int channels;
43 int ps; ///< -1 implicit, 1 presence
44 int frame_length_short;
45 } MPEG4AudioConfig;
46
47 extern const int ff_mpeg4audio_sample_rates[16];
48 extern const uint8_t ff_mpeg4audio_channels[14];
49
50 /**
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 * @param[in] logctx opaque struct starting with an AVClass element, used for logging.
56 * @return negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata.
57 */
58 int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb,
59 int sync_extension, void *logctx);
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] size Extradata size in bytes.
66 * @param[in] sync_extension look for a sync extension after config if true.
67 * @param[in] logctx opaque struct starting with an AVClass element, used for logging.
68 * @return negative AVERROR code on error, AudioSpecificConfig bit index in extradata on success.
69 */
70 int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf,
71 int size, int sync_extension, void *logctx);
72
73 enum AudioObjectType {
74 AOT_NULL,
75 // Support? Name
76 AOT_AAC_MAIN, ///< Y Main
77 AOT_AAC_LC, ///< Y Low Complexity
78 AOT_AAC_SSR, ///< N (code in SoC repo) Scalable Sample Rate
79 AOT_AAC_LTP, ///< Y Long Term Prediction
80 AOT_SBR, ///< Y Spectral Band Replication
81 AOT_AAC_SCALABLE, ///< N Scalable
82 AOT_TWINVQ, ///< N Twin Vector Quantizer
83 AOT_CELP, ///< N Code Excited Linear Prediction
84 AOT_HVXC, ///< N Harmonic Vector eXcitation Coding
85 AOT_TTSI = 12, ///< N Text-To-Speech Interface
86 AOT_MAINSYNTH, ///< N Main Synthesis
87 AOT_WAVESYNTH, ///< N Wavetable Synthesis
88 AOT_MIDI, ///< N General MIDI
89 AOT_SAFX, ///< N Algorithmic Synthesis and Audio Effects
90 AOT_ER_AAC_LC, ///< N Error Resilient Low Complexity
91 AOT_ER_AAC_LTP = 19, ///< N Error Resilient Long Term Prediction
92 AOT_ER_AAC_SCALABLE, ///< N Error Resilient Scalable
93 AOT_ER_TWINVQ, ///< N Error Resilient Twin Vector Quantizer
94 AOT_ER_BSAC, ///< N Error Resilient Bit-Sliced Arithmetic Coding
95 AOT_ER_AAC_LD, ///< N Error Resilient Low Delay
96 AOT_ER_CELP, ///< N Error Resilient Code Excited Linear Prediction
97 AOT_ER_HVXC, ///< N Error Resilient Harmonic Vector eXcitation Coding
98 AOT_ER_HILN, ///< N Error Resilient Harmonic and Individual Lines plus Noise
99 AOT_ER_PARAM, ///< N Error Resilient Parametric
100 AOT_SSC, ///< N SinuSoidal Coding
101 AOT_PS, ///< N Parametric Stereo
102 AOT_SURROUND, ///< N MPEG Surround
103 AOT_ESCAPE, ///< Y Escape Value
104 AOT_L1, ///< Y Layer 1
105 AOT_L2, ///< Y Layer 2
106 AOT_L3, ///< Y Layer 3
107 AOT_DST, ///< N Direct Stream Transfer
108 AOT_ALS, ///< Y Audio LosslesS
109 AOT_SLS, ///< N Scalable LosslesS
110 AOT_SLS_NON_CORE, ///< N Scalable LosslesS (non core)
111 AOT_ER_AAC_ELD, ///< N Error Resilient Enhanced Low Delay
112 AOT_SMR_SIMPLE, ///< N Symbolic Music Representation Simple
113 AOT_SMR_MAIN, ///< N Symbolic Music Representation Main
114 AOT_USAC_NOSBR, ///< N Unified Speech and Audio Coding (no SBR)
115 AOT_SAOC, ///< N Spatial Audio Object Coding
116 AOT_LD_SURROUND, ///< N Low Delay MPEG Surround
117 AOT_USAC, ///< N Unified Speech and Audio Coding
118 };
119
120 #define MAX_PCE_SIZE 320 ///<Maximum size of a PCE including the 3-bit ID_PCE
121 ///<marker and the comment
122
123 216 static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb,
124 GetBitContext *gb,
125 int bits)
126 {
127 216 unsigned int el = get_bits(gb, bits);
128 216 put_bits(pb, bits, el);
129 216 return el;
130 }
131
132 18 static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
133 {
134 int five_bit_ch, four_bit_ch, comment_size, bits;
135 18 int offset = put_bits_count(pb);
136
137 18 ff_pce_copy_bits(pb, gb, 10); // Tag, Object Type, Frequency
138 18 five_bit_ch = ff_pce_copy_bits(pb, gb, 4); // Front
139 18 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side
140 18 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back
141 18 four_bit_ch = ff_pce_copy_bits(pb, gb, 2); // LFE
142 18 four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data
143 18 five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling
144
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18 if (ff_pce_copy_bits(pb, gb, 1)) // Mono Mixdown
145 ff_pce_copy_bits(pb, gb, 4);
146
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18 if (ff_pce_copy_bits(pb, gb, 1)) // Stereo Mixdown
147 ff_pce_copy_bits(pb, gb, 4);
148
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18 if (ff_pce_copy_bits(pb, gb, 1)) // Matrix Mixdown
149 ff_pce_copy_bits(pb, gb, 3);
150
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18 for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
151 ff_pce_copy_bits(pb, gb, 16);
152
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18 if (bits)
153 18 ff_pce_copy_bits(pb, gb, bits);
154 18 align_put_bits(pb);
155 18 align_get_bits(gb);
156 18 comment_size = ff_pce_copy_bits(pb, gb, 8);
157
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18 for (; comment_size > 0; comment_size--)
158 ff_pce_copy_bits(pb, gb, 8);
159
160 18 return put_bits_count(pb) - offset;
161 }
162
163 #endif /* AVCODEC_MPEG4AUDIO_H */
164