FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/3dostr.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 12 124 9.7%
Functions: 1 3 33.3%
Branches: 6 68 8.8%
Line Branch Exec Source
1 /*
2 * 3DO STR demuxer
3 * Copyright (c) 2015 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/intreadwrite.h"
23 #include "avformat.h"
24 #include "demux.h"
25 #include "internal.h"
26
27 7186 static int threedostr_probe(const AVProbeData *p)
28 {
29
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 7472 for (int i = 0; i < p->buf_size;) {
30 7472 unsigned chunk = AV_RL32(p->buf + i);
31 7472 unsigned size = AV_RB32(p->buf + i + 4);
32
33
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 7472 if (size < 8 || p->buf_size - i < size)
34 7186 return 0;
35 286 i += 8;
36 286 size -= 8;
37
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 286 switch (chunk) {
38 ✗ case MKTAG('C','T','R','L'):
39 ✗ break;
40 ✗ case MKTAG('S','N','D','S'):
41 ✗ if (size < 56)
42 ✗ return 0;
43 ✗ i += 8;
44 ✗ if (AV_RL32(p->buf + i) != MKTAG('S','H','D','R'))
45 ✗ return 0;
46 ✗ i += 28;
47
48 ✗ if (AV_RB32(p->buf + i) <= 0)
49 ✗ return 0;
50 ✗ i += 4;
51 ✗ if (AV_RB32(p->buf + i) <= 0)
52 ✗ return 0;
53 ✗ i += 4;
54 ✗ if (AV_RL32(p->buf + i) == MKTAG('S','D','X','2'))
55 ✗ return AVPROBE_SCORE_MAX;
56 else
57 ✗ return 0;
58 break;
59 ✗ case MKTAG('S','H','D','R'):
60 ✗ if (size > 0x78) {
61 ✗ i += 0x78;
62 ✗ size -= 0x78;
63 }
64 ✗ break;
65 286 default:
66 286 break;
67 }
68
69 286 i += size;
70 }
71
72 ✗ return 0;
73 }
74
75 ✗ static int threedostr_read_header(AVFormatContext *s)
76 {
77 ✗ unsigned chunk, codec = 0, size, ctrl_size = -1, found_shdr = 0;
78 AVStream *st;
79
80 ✗ while (!avio_feof(s->pb) && !found_shdr) {
81 ✗ chunk = avio_rl32(s->pb);
82 ✗ size = avio_rb32(s->pb);
83
84 ✗ if (size < 8)
85 ✗ return AVERROR_INVALIDDATA;
86 ✗ size -= 8;
87
88 ✗ switch (chunk) {
89 ✗ case MKTAG('C','T','R','L'):
90 ✗ ctrl_size = size;
91 ✗ break;
92 ✗ case MKTAG('S','N','D','S'):
93 ✗ if (size < 56)
94 ✗ return AVERROR_INVALIDDATA;
95 ✗ avio_skip(s->pb, 8);
96 ✗ if (avio_rl32(s->pb) != MKTAG('S','H','D','R'))
97 ✗ return AVERROR_INVALIDDATA;
98 ✗ avio_skip(s->pb, 24);
99
100 ✗ st = avformat_new_stream(s, NULL);
101 ✗ if (!st)
102 ✗ return AVERROR(ENOMEM);
103
104 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
105 ✗ st->codecpar->sample_rate = avio_rb32(s->pb);
106 ✗ st->codecpar->ch_layout.nb_channels = avio_rb32(s->pb);
107 ✗ if (st->codecpar->ch_layout.nb_channels <= 0 || st->codecpar->sample_rate <= 0)
108 ✗ return AVERROR_INVALIDDATA;
109 ✗ codec = avio_rl32(s->pb);
110 ✗ avio_skip(s->pb, 4);
111 ✗ if (ctrl_size == 20 || ctrl_size == 3 || ctrl_size == -1)
112 ✗ st->duration = (avio_rb32(s->pb) - 1) / st->codecpar->ch_layout.nb_channels;
113 else
114 ✗ st->duration = avio_rb32(s->pb) * 16 / st->codecpar->ch_layout.nb_channels;
115 ✗ size -= 56;
116 ✗ found_shdr = 1;
117 ✗ break;
118 ✗ case MKTAG('S','H','D','R'):
119 ✗ if (size > 0x78) {
120 ✗ avio_skip(s->pb, 0x74);
121 ✗ size -= 0x78;
122 ✗ if (avio_rl32(s->pb) == MKTAG('C','T','R','L') && size > 4) {
123 ✗ ctrl_size = avio_rb32(s->pb);
124 ✗ size -= 4;
125 }
126 }
127 ✗ break;
128 ✗ default:
129 ✗ av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
130 ✗ break;
131 }
132
133 ✗ avio_skip(s->pb, size);
134 }
135
136 ✗ switch (codec) {
137 ✗ case MKTAG('S','D','X','2'):
138 ✗ st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM;
139 ✗ st->codecpar->block_align = 1 * st->codecpar->ch_layout.nb_channels;
140 ✗ break;
141 ✗ default:
142 ✗ avpriv_request_sample(s, "codec %X", codec);
143 ✗ return AVERROR_PATCHWELCOME;
144 }
145
146 ✗ avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
147
148 ✗ return 0;
149 }
150
151 ✗ static int threedostr_read_packet(AVFormatContext *s, AVPacket *pkt)
152 {
153 unsigned chunk, size;
154 ✗ AVStream *st = s->streams[0];
155 int64_t pos;
156 ✗ int ret = 0;
157
158 ✗ while (!avio_feof(s->pb)) {
159 ✗ pos = avio_tell(s->pb);
160 ✗ chunk = avio_rl32(s->pb);
161 ✗ size = avio_rb32(s->pb);
162
163 ✗ if (!size)
164 ✗ continue;
165
166 ✗ if (size < 8)
167 ✗ return AVERROR_INVALIDDATA;
168 ✗ size -= 8;
169
170 ✗ switch (chunk) {
171 ✗ case MKTAG('S','N','D','S'):
172 ✗ if (size <= 16)
173 ✗ return AVERROR_INVALIDDATA;
174 ✗ avio_skip(s->pb, 8);
175 ✗ if (avio_rl32(s->pb) != MKTAG('S','S','M','P'))
176 ✗ return AVERROR_INVALIDDATA;
177 ✗ avio_skip(s->pb, 4);
178 ✗ size -= 16;
179 ✗ ret = av_get_packet(s->pb, pkt, size);
180 ✗ pkt->pos = pos;
181 ✗ pkt->stream_index = 0;
182 ✗ pkt->duration = size / st->codecpar->ch_layout.nb_channels;
183 ✗ return ret;
184 ✗ default:
185 ✗ av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
186 ✗ break;
187 }
188
189 ✗ avio_skip(s->pb, size);
190 }
191
192 ✗ return AVERROR_EOF;
193 }
194
195 const FFInputFormat ff_threedostr_demuxer = {
196 .p.name = "3dostr",
197 .p.long_name = NULL_IF_CONFIG_SMALL("3DO STR"),
198 .p.extensions = "str",
199 .p.flags = AVFMT_GENERIC_INDEX,
200 .read_probe = threedostr_probe,
201 .read_header = threedostr_read_header,
202 .read_packet = threedostr_read_packet,
203 };
204