FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dolby_e_parse.c
Date: 2025-10-24 21:16:34
Exec Total Coverage
Lines: 63 101 62.4%
Functions: 4 4 100.0%
Branches: 25 60 41.7%
Line Branch Exec Source
1 /*
2 * Copyright (C) 2017 foo86
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/avassert.h"
22 #include "get_bits.h"
23 #include "put_bits.h"
24 #include "dolby_e.h"
25
26 static const uint8_t nb_programs_tab[MAX_PROG_CONF + 1] = {
27 2, 3, 2, 3, 4, 5, 4, 5, 6, 7, 8, 1, 2, 3, 3, 4, 5, 6, 1, 2, 3, 4, 1, 1
28 };
29
30 static const uint8_t nb_channels_tab[MAX_PROG_CONF + 1] = {
31 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 8, 8
32 };
33
34 static const uint16_t sample_rate_tab[16] = {
35 0, 42965, 43008, 44800, 53706, 53760
36 };
37
38 1284 static int skip_input(DBEContext *s, int nb_words)
39 {
40
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 1284 if (nb_words > s->input_size) {
41 ✗ return AVERROR_INVALIDDATA;
42 }
43
44 1284 s->input += nb_words * s->word_bytes;
45 1284 s->input_size -= nb_words;
46 1284 return 0;
47 }
48
49 642 static int parse_key(DBEContext *s)
50 {
51
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 642 if (s->key_present) {
52 642 const uint8_t *key = s->input;
53 642 int ret = skip_input(s, 1);
54
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 642 if (ret < 0)
55 ✗ return ret;
56 642 return AV_RB24(key) >> 24 - s->word_bits;
57 }
58 ✗ return 0;
59 }
60
61 4380 int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key)
62 {
63 4380 const uint8_t *src = s->input;
64 4380 uint8_t *dst = s->buffer;
65 PutBitContext pb;
66 int i;
67
68
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 4380 av_assert0(nb_words <= 1024u);
69
70
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 4380 if (nb_words > s->input_size) {
71 ✗ if (s->avctx)
72 ✗ av_log(s->avctx, AV_LOG_ERROR, "Packet too short\n");
73 ✗ return AVERROR_INVALIDDATA;
74 }
75
76
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 4380 switch (s->word_bits) {
77 4380 case 16:
78
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 951144 for (i = 0; i < nb_words; i++, src += 2, dst += 2)
79 946764 AV_WB16(dst, AV_RB16(src) ^ key);
80 4380 break;
81 ✗ case 20:
82 ✗ init_put_bits(&pb, s->buffer, sizeof(s->buffer));
83 ✗ for (i = 0; i < nb_words; i++, src += 3)
84 ✗ put_bits(&pb, 20, AV_RB24(src) >> 4 ^ key);
85 ✗ flush_put_bits(&pb);
86 ✗ break;
87 ✗ case 24:
88 ✗ for (i = 0; i < nb_words; i++, src += 3, dst += 3)
89 ✗ AV_WB24(dst, AV_RB24(src) ^ key);
90 ✗ break;
91 ✗ default:
92 ✗ av_unreachable("ff_dolby_e_parse_header() only sets 16, 20, 24 and errors out otherwise");
93 }
94
95 4380 return init_get_bits(&s->gb, s->buffer, nb_words * s->word_bits);
96 }
97
98 643 int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size)
99 {
100 643 DolbyEHeaderInfo *const header = &s->metadata;
101 int hdr, ret, key, mtd_size;
102
103
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 643 if (buf_size < 3)
104 1 return AVERROR_INVALIDDATA;
105
106 642 hdr = AV_RB24(buf);
107
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 642 if ((hdr & 0xfffffe) == 0x7888e) {
108 ✗ s->word_bits = 24;
109
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 642 } else if ((hdr & 0xffffe0) == 0x788e0) {
110 ✗ s->word_bits = 20;
111
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 642 } else if ((hdr & 0xfffe00) == 0x78e00) {
112 642 s->word_bits = 16;
113 } else {
114 ✗ if (s->avctx)
115 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid frame header\n");
116 ✗ return AVERROR_INVALIDDATA;
117 }
118
119 642 s->word_bytes = s->word_bits + 7 >> 3;
120 642 s->input = buf + s->word_bytes;
121 642 s->input_size = buf_size / s->word_bytes - 1;
122 642 s->key_present = hdr >> 24 - s->word_bits & 1;
123
124
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 642 if ((key = parse_key(s)) < 0)
125 ✗ return key;
126
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 642 if ((ret = ff_dolby_e_convert_input(s, 1, key)) < 0)
127 ✗ return ret;
128
129 642 skip_bits(&s->gb, 4);
130 642 mtd_size = get_bits(&s->gb, 10);
131
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 642 if (!mtd_size) {
132 ✗ if (s->avctx)
133 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid metadata size\n");
134 ✗ return AVERROR_INVALIDDATA;
135 }
136
137
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 642 if ((ret = ff_dolby_e_convert_input(s, mtd_size, key)) < 0)
138 ✗ return ret;
139
140 642 skip_bits(&s->gb, 14);
141 642 header->prog_conf = get_bits(&s->gb, 6);
142
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 642 if (header->prog_conf > MAX_PROG_CONF) {
143 ✗ if (s->avctx)
144 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid program configuration\n");
145 ✗ return AVERROR_INVALIDDATA;
146 }
147
148 642 header->nb_channels = nb_channels_tab[header->prog_conf];
149 642 header->nb_programs = nb_programs_tab[header->prog_conf];
150
151 642 header->fr_code = get_bits(&s->gb, 4);
152 642 header->fr_code_orig = get_bits(&s->gb, 4);
153
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 642 if (!(header->sample_rate = sample_rate_tab[header->fr_code]) ||
154
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 642 !sample_rate_tab[header->fr_code_orig]) {
155 ✗ if (s->avctx)
156 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid frame rate code\n");
157 ✗ return AVERROR_INVALIDDATA;
158 }
159
160 642 skip_bits_long(&s->gb, 88);
161
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 4494 for (int i = 0; i < header->nb_channels; i++)
162 3852 header->ch_size[i] = get_bits(&s->gb, 10);
163 642 header->mtd_ext_size = get_bits(&s->gb, 8);
164 642 header->meter_size = get_bits(&s->gb, 8);
165
166 642 skip_bits_long(&s->gb, 10 * header->nb_programs);
167
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 4494 for (int i = 0; i < header->nb_channels; i++) {
168 3852 header->rev_id[i] = get_bits(&s->gb, 4);
169 3852 skip_bits1(&s->gb);
170 3852 header->begin_gain[i] = get_bits(&s->gb, 10);
171 3852 header->end_gain[i] = get_bits(&s->gb, 10);
172 }
173
174
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 642 if (get_bits_left(&s->gb) < 0) {
175 ✗ if (s->avctx)
176 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of metadata\n");
177 ✗ return AVERROR_INVALIDDATA;
178 }
179
180 642 return skip_input(s, mtd_size + 1);
181 }
182