FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/dfa.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 45 59 76.3%
Branches: 23 34 67.6%

Line Branch Exec Source
1 /*
2 * Chronomaster DFA Format Demuxer
3 * Copyright (c) 2011 Konstantin Shishkov
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 <inttypes.h>
23
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26 #include "internal.h"
27
28 6780 static int dfa_probe(const AVProbeData *p)
29 {
30
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6780 if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
31 6769 return 0;
32
33
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11 if (AV_RL32(p->buf + 16) != 0x80)
34 return AVPROBE_SCORE_MAX / 4;
35
36 11 return AVPROBE_SCORE_MAX;
37 }
38
39 11 static int dfa_read_header(AVFormatContext *s)
40 {
41 11 AVIOContext *pb = s->pb;
42 AVStream *st;
43 int frames, ret;
44 int version;
45 uint32_t mspf;
46
47
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11 if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
48 av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
49 return AVERROR_INVALIDDATA;
50 }
51
52 11 version = avio_rl16(pb);
53 11 frames = avio_rl16(pb);
54
55 11 st = avformat_new_stream(s, NULL);
56
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11 if (!st)
57 return AVERROR(ENOMEM);
58
59 11 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
60 11 st->codecpar->codec_id = AV_CODEC_ID_DFA;
61 11 st->codecpar->width = avio_rl16(pb);
62 11 st->codecpar->height = avio_rl16(pb);
63 11 mspf = avio_rl32(pb);
64
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11 if (!mspf) {
65 av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
66 mspf = 100;
67 }
68 11 avpriv_set_pts_info(st, 24, mspf, 1000);
69 11 avio_skip(pb, 128 - 16); // padding
70 11 st->duration = frames;
71
72
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11 if ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0)
73 return ret;
74 11 AV_WL16(st->codecpar->extradata, version);
75
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11 if (version == 0x100)
76 st->sample_aspect_ratio = (AVRational){2, 1};
77
78 11 return 0;
79 }
80
81 194 static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
82 {
83 194 AVIOContext *pb = s->pb;
84 uint32_t frame_size;
85 194 int ret, first = 1;
86
87
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194 if (avio_feof(pb))
88 19 return AVERROR_EOF;
89
90
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175 if (av_get_packet(pb, pkt, 12) != 12)
91 3 return AVERROR(EIO);
92
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351 while (!avio_feof(pb)) {
93
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343 if (!first) {
94 171 ret = av_append_packet(pb, pkt, 12);
95
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171 if (ret < 0) {
96 return ret;
97 }
98 } else
99 172 first = 0;
100 343 frame_size = AV_RL32(pkt->data + pkt->size - 8);
101
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343 if (frame_size > INT_MAX - 4) {
102 av_log(s, AV_LOG_ERROR, "Too large chunk size: %"PRIu32"\n", frame_size);
103 return AVERROR(EIO);
104 }
105
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343 if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
106
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164 if (frame_size) {
107 av_log(s, AV_LOG_WARNING,
108 "skipping %"PRIu32" bytes of end-of-frame marker chunk\n",
109 frame_size);
110 avio_skip(pb, frame_size);
111 }
112 164 return 0;
113 }
114 179 ret = av_append_packet(pb, pkt, frame_size);
115
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179 if (ret < 0) {
116 return ret;
117 }
118 }
119
120 8 return 0;
121 }
122
123 const AVInputFormat ff_dfa_demuxer = {
124 .name = "dfa",
125 .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
126 .read_probe = dfa_probe,
127 .read_header = dfa_read_header,
128 .read_packet = dfa_read_packet,
129 .flags = AVFMT_GENERIC_INDEX,
130 };
131