FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg4audio.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 69 79 87.3%
Branches: 50 60 83.3%

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1 /*
2 * MPEG-4 Audio common code
3 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
4 * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "get_bits.h"
24 #include "put_bits.h"
25 #include "mpeg4audio.h"
26
27 /**
28 * Parse MPEG-4 audio configuration for ALS object type.
29 * @param[in] gb bit reader context
30 * @param[in] c MPEG4AudioConfig structure to fill
31 * @return on success 0 is returned, otherwise a value < 0
32 */
33 21 static int parse_config_ALS(GetBitContext *gb, MPEG4AudioConfig *c, void *logctx)
34 {
35
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21 if (get_bits_left(gb) < 112)
36 return AVERROR_INVALIDDATA;
37
38
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21 if (get_bits_long(gb, 32) != MKBETAG('A','L','S','\0'))
39 return AVERROR_INVALIDDATA;
40
41 // override AudioSpecificConfig channel configuration and sample rate
42 // which are buggy in old ALS conformance files
43 21 c->sample_rate = get_bits_long(gb, 32);
44
45
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21 if (c->sample_rate <= 0) {
46 av_log(logctx, AV_LOG_ERROR, "Invalid sample rate %d\n", c->sample_rate);
47 return AVERROR_INVALIDDATA;
48 }
49
50 // skip number of samples
51 21 skip_bits_long(gb, 32);
52
53 // read number of channels
54 21 c->chan_config = 0;
55 21 c->channels = get_bits(gb, 16) + 1;
56
57 21 return 0;
58 }
59
60 /* XXX: make sure to update the copies in the different encoders if you change
61 * this table */
62 const int avpriv_mpeg4audio_sample_rates[16] = {
63 96000, 88200, 64000, 48000, 44100, 32000,
64 24000, 22050, 16000, 12000, 11025, 8000, 7350
65 };
66
67 const uint8_t ff_mpeg4audio_channels[14] = {
68 0,
69 1, // mono (1/0)
70 2, // stereo (2/0)
71 3, // 3/0
72 4, // 3/1
73 5, // 3/2
74 6, // 3/2.1
75 8, // 5/2.1
76 0,
77 0,
78 0,
79 7, // 3/3.1
80 8, // 3/2/2.1
81 24 // 3/3/3 - 5/2/3 - 3/0/0.2
82 };
83
84 835 static inline int get_object_type(GetBitContext *gb)
85 {
86 835 int object_type = get_bits(gb, 5);
87
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835 if (object_type == AOT_ESCAPE)
88 36 object_type = 32 + get_bits(gb, 6);
89 835 return object_type;
90 }
91
92 772 static inline int get_sample_rate(GetBitContext *gb, int *index)
93 {
94 772 *index = get_bits(gb, 4);
95
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1523 return *index == 0x0f ? get_bits(gb, 24) :
96 751 avpriv_mpeg4audio_sample_rates[*index];
97 }
98
99 688 int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb,
100 int sync_extension, void *logctx)
101 {
102 int specific_config_bitindex, ret;
103 688 int start_bit_index = get_bits_count(gb);
104 688 c->object_type = get_object_type(gb);
105 688 c->sample_rate = get_sample_rate(gb, &c->sampling_index);
106 688 c->chan_config = get_bits(gb, 4);
107
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688 if (c->chan_config < FF_ARRAY_ELEMS(ff_mpeg4audio_channels))
108 688 c->channels = ff_mpeg4audio_channels[c->chan_config];
109 else {
110 av_log(logctx, AV_LOG_ERROR, "Invalid chan_config %d\n", c->chan_config);
111 return AVERROR_INVALIDDATA;
112 }
113 688 c->sbr = -1;
114 688 c->ps = -1;
115
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688 if (c->object_type == AOT_SBR || (c->object_type == AOT_PS &&
116 // check for W6132 Annex YYYY draft MP3onMP4
117
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3 !(show_bits(gb, 3) & 0x03 && !(show_bits(gb, 9) & 0x3F)))) {
118
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6 if (c->object_type == AOT_PS)
119 3 c->ps = 1;
120 6 c->ext_object_type = AOT_SBR;
121 6 c->sbr = 1;
122 6 c->ext_sample_rate = get_sample_rate(gb, &c->ext_sampling_index);
123 6 c->object_type = get_object_type(gb);
124
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6 if (c->object_type == AOT_ER_BSAC)
125 c->ext_chan_config = get_bits(gb, 4);
126 } else {
127 682 c->ext_object_type = AOT_NULL;
128 682 c->ext_sample_rate = 0;
129 }
130 688 specific_config_bitindex = get_bits_count(gb);
131
132
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688 if (c->object_type == AOT_ALS) {
133 21 skip_bits(gb, 5);
134
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21 if (show_bits(gb, 24) != MKBETAG('\0','A','L','S'))
135 skip_bits(gb, 24);
136
137 21 specific_config_bitindex = get_bits_count(gb);
138
139 21 ret = parse_config_ALS(gb, c, logctx);
140
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21 if (ret < 0)
141 return ret;
142 }
143
144
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688 if (c->ext_object_type != AOT_SBR && sync_extension) {
145
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14705 while (get_bits_left(gb) > 15) {
146
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14485 if (show_bits(gb, 11) == 0x2b7) { // sync extension
147 141 get_bits(gb, 11);
148 141 c->ext_object_type = get_object_type(gb);
149
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141 if (c->ext_object_type == AOT_SBR && (c->sbr = get_bits1(gb)) == 1) {
150 78 c->ext_sample_rate = get_sample_rate(gb, &c->ext_sampling_index);
151
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78 if (c->ext_sample_rate == c->sample_rate)
152 6 c->sbr = -1;
153 }
154
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141 if (get_bits_left(gb) > 11 && get_bits(gb, 11) == 0x548)
155 27 c->ps = get_bits1(gb);
156 141 break;
157 } else
158 14344 get_bits1(gb); // skip 1 bit
159 }
160 }
161
162 //PS requires SBR
163
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688 if (!c->sbr)
164 54 c->ps = 0;
165 //Limit implicit PS to the HE-AACv2 Profile
166
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688 if ((c->ps == -1 && c->object_type != AOT_AAC_LC) || c->channels & ~0x01)
167 518 c->ps = 0;
168
169 688 return specific_config_bitindex - start_bit_index;
170 }
171
172 146 int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf,
173 int size, int sync_extension, void *logctx)
174 {
175 GetBitContext gb;
176 int ret;
177
178
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146 if (size <= 0)
179 1 return AVERROR_INVALIDDATA;
180
181 145 ret = init_get_bits8(&gb, buf, size);
182
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145 if (ret < 0)
183 return ret;
184
185 145 return ff_mpeg4audio_get_config_gb(c, &gb, sync_extension, logctx);
186 }
187