FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/tak.c
Date: 2021-09-23 20:34:37
Exec Total Coverage
Lines: 61 66 92.4%
Branches: 26 32 81.2%
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 BITSTREAM_READER_LE
27 #include "tak.h"
28
29 static const int64_t tak_channel_layouts[] = {
30 0,
31 AV_CH_FRONT_LEFT,
32 AV_CH_FRONT_RIGHT,
33 AV_CH_FRONT_CENTER,
34 AV_CH_LOW_FREQUENCY,
35 AV_CH_BACK_LEFT,
36 AV_CH_BACK_RIGHT,
37 AV_CH_FRONT_LEFT_OF_CENTER,
38 AV_CH_FRONT_RIGHT_OF_CENTER,
39 AV_CH_BACK_CENTER,
40 AV_CH_SIDE_LEFT,
41 AV_CH_SIDE_RIGHT,
42 AV_CH_TOP_CENTER,
43 AV_CH_TOP_FRONT_LEFT,
44 AV_CH_TOP_FRONT_CENTER,
45 AV_CH_TOP_FRONT_RIGHT,
46 AV_CH_TOP_BACK_LEFT,
47 AV_CH_TOP_BACK_CENTER,
48 AV_CH_TOP_BACK_RIGHT,
49 };
50
51 static const uint16_t frame_duration_type_quants[] = {
52 3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
53 };
54
55 23 static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
56 {
57 int nb_samples, max_nb_samples;
58
59
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 23 if (type <= TAK_FST_250ms) {
60 21 nb_samples = sample_rate * frame_duration_type_quants[type] >>
61 TAK_FRAME_DURATION_QUANT_SHIFT;
62 21 max_nb_samples = 16384;
63
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 2 } else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
64 1 nb_samples = frame_duration_type_quants[type];
65 1 max_nb_samples = sample_rate *
66 1 frame_duration_type_quants[TAK_FST_250ms] >>
67 TAK_FRAME_DURATION_QUANT_SHIFT;
68 } else {
69 1 return AVERROR_INVALIDDATA;
70 }
71
72
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 22 if (nb_samples <= 0 || nb_samples > max_nb_samples)
73 ✗ return AVERROR_INVALIDDATA;
74
75 22 return nb_samples;
76 }
77
78 83 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
79 {
80 uint32_t crc, CRC;
81
82
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 83 if (buf_size < 4)
83 ✗ return AVERROR_INVALIDDATA;
84 83 buf_size -= 3;
85
86 83 CRC = AV_RB24(buf + buf_size);
87 83 crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size);
88
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 83 if (CRC != crc)
89 8 return AVERROR_INVALIDDATA;
90
91 75 return 0;
92 }
93
94 23 void ff_tak_parse_streaminfo(TAKStreamInfo *s, GetBitContext *gb)
95 {
96 23 uint64_t channel_mask = 0;
97 int frame_type, i;
98
99 23 s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
100 23 skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
101
102 23 frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
103 23 s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
104
105 23 s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
106 23 s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
107 TAK_SAMPLE_RATE_MIN;
108 23 s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
109 TAK_BPS_MIN;
110 23 s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
111 TAK_CHANNELS_MIN;
112
113
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 23 if (get_bits1(gb)) {
114 2 skip_bits(gb, TAK_FORMAT_VALID_BITS);
115
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 2 if (get_bits1(gb)) {
116
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 23 for (i = 0; i < s->channels; i++) {
117 21 int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
118
119
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 21 if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
120 7 channel_mask |= tak_channel_layouts[value];
121 }
122 }
123 }
124
125 23 s->ch_layout = channel_mask;
126 23 s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
127 23 }
128
129 1 int avpriv_tak_parse_streaminfo(TAKStreamInfo *s, const uint8_t *buf, int size)
130 {
131 GetBitContext gb;
132 1 int ret = init_get_bits8(&gb, buf, size);
133
134
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 1 if (ret < 0)
135 ✗ return AVERROR_INVALIDDATA;
136
137 1 ff_tak_parse_streaminfo(s, &gb);
138
139 1 return 0;
140 }
141
142 125 int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
143 TAKStreamInfo *ti, int log_level_offset)
144 {
145
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 125 if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
146 ✗ av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
147 ✗ return AVERROR_INVALIDDATA;
148 }
149
150 125 ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
151 125 ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
152
153
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 125 if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
154 12 ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
155 12 skip_bits(gb, 2);
156 } else {
157 113 ti->last_frame_samples = 0;
158 }
159
160
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 125 if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
161 22 ff_tak_parse_streaminfo(ti, gb);
162
163
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 22 if (get_bits(gb, 6))
164 3 skip_bits(gb, 25);
165 22 align_get_bits(gb);
166 }
167
168
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 125 if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
169 3 return AVERROR_INVALIDDATA;
170
171 122 skip_bits(gb, 24);
172
173 122 return 0;
174 }
175