FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/tak.c
Date: 2025-10-25 08:50:29
Exec Total Coverage
Lines: 66 72 91.7%
Functions: 5 5 100.0%
Branches: 31 38 81.6%
Line Branch Exec Source
1 /*
2 * TAK common code
3 * Copyright (c) 2012 Paul B Mahol
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 #include "libavutil/channel_layout.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25
26 #define CACHED_BITSTREAM_READER !ARCH_X86_32
27 #define BITSTREAM_READER_LE
28 #include "tak.h"
29
30 static const int64_t tak_channel_layouts[] = {
31 0,
32 AV_CH_FRONT_LEFT,
33 AV_CH_FRONT_RIGHT,
34 AV_CH_FRONT_CENTER,
35 AV_CH_LOW_FREQUENCY,
36 AV_CH_BACK_LEFT,
37 AV_CH_BACK_RIGHT,
38 AV_CH_FRONT_LEFT_OF_CENTER,
39 AV_CH_FRONT_RIGHT_OF_CENTER,
40 AV_CH_BACK_CENTER,
41 AV_CH_SIDE_LEFT,
42 AV_CH_SIDE_RIGHT,
43 AV_CH_TOP_CENTER,
44 AV_CH_TOP_FRONT_LEFT,
45 AV_CH_TOP_FRONT_CENTER,
46 AV_CH_TOP_FRONT_RIGHT,
47 AV_CH_TOP_BACK_LEFT,
48 AV_CH_TOP_BACK_CENTER,
49 AV_CH_TOP_BACK_RIGHT,
50 };
51
52 static const uint16_t frame_duration_type_quants[] = {
53 3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
54 };
55
56 23 static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
57 {
58 int nb_samples, max_nb_samples;
59
60
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 23 if (type <= TAK_FST_250ms) {
61 21 nb_samples = sample_rate * frame_duration_type_quants[type] >>
62 TAK_FRAME_DURATION_QUANT_SHIFT;
63 21 max_nb_samples = 16384;
64
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 2 } else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
65 1 nb_samples = frame_duration_type_quants[type];
66 1 max_nb_samples = sample_rate *
67 1 frame_duration_type_quants[TAK_FST_250ms] >>
68 TAK_FRAME_DURATION_QUANT_SHIFT;
69 } else {
70 1 return AVERROR_INVALIDDATA;
71 }
72
73
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 22 if (nb_samples <= 0 || nb_samples > max_nb_samples)
74 ✗ return AVERROR_INVALIDDATA;
75
76 22 return nb_samples;
77 }
78
79 82 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
80 {
81 uint32_t crc, CRC;
82
83
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 82 if (buf_size < 4)
84 ✗ return AVERROR_INVALIDDATA;
85 82 buf_size -= 3;
86
87 82 CRC = AV_RB24(buf + buf_size);
88 82 crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size);
89
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 82 if (CRC != crc)
90 7 return AVERROR_INVALIDDATA;
91
92 75 return 0;
93 }
94
95 23 static int tak_parse_streaminfo(TAKStreamInfo *s, GetBitContext *gb)
96 {
97 23 uint64_t channel_mask = 0;
98 int frame_type, i, ret;
99
100 23 s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
101 23 skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
102
103 23 frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
104 23 s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
105
106 23 s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
107 23 s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
108 TAK_SAMPLE_RATE_MIN;
109 23 s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
110 TAK_BPS_MIN;
111 23 s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
112 TAK_CHANNELS_MIN;
113
114
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 23 if (get_bits1(gb)) {
115 2 skip_bits(gb, TAK_FORMAT_VALID_BITS);
116
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 2 if (get_bits1(gb)) {
117
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 23 for (i = 0; i < s->channels; i++) {
118 21 int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
119
120
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 21 if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
121 7 channel_mask |= tak_channel_layouts[value];
122 }
123 }
124 }
125
126 23 s->ch_layout = channel_mask;
127
128 23 ret = tak_get_nb_samples(s->sample_rate, frame_type);
129
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 23 if (ret < 0)
130 1 return ret;
131 22 s->frame_samples = ret;
132
133 22 return 0;
134 }
135
136 1 int avpriv_tak_parse_streaminfo(TAKStreamInfo *s, const uint8_t *buf, int size)
137 {
138 GetBitContext gb;
139 1 int ret = init_get_bits8(&gb, buf, size);
140
141
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 1 if (ret < 0)
142 ✗ return AVERROR_INVALIDDATA;
143
144 1 return tak_parse_streaminfo(s, &gb);
145 }
146
147 125 int ff_tak_decode_frame_header(void *logctx, GetBitContext *gb,
148 TAKStreamInfo *ti, int log_level_offset)
149 {
150
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 125 if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
151 ✗ av_log(logctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
152 ✗ return AVERROR_INVALIDDATA;
153 }
154
155 125 ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
156 125 ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
157
158
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 125 if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
159 12 ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
160 12 skip_bits(gb, 2);
161 } else {
162 113 ti->last_frame_samples = 0;
163 }
164
165
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 125 if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
166 22 int ret = tak_parse_streaminfo(ti, gb);
167
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 22 if (ret < 0)
168 1 return ret;
169
170
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 21 if (get_bits(gb, 6))
171 3 skip_bits(gb, 25);
172 21 align_get_bits(gb);
173 }
174
175
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 124 if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
176 3 return AVERROR_INVALIDDATA;
177
178
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 121 if (get_bits_left(gb) < 24)
179 ✗ return AVERROR_INVALIDDATA;
180
181 121 skip_bits(gb, 24);
182
183 121 return 0;
184 }
185