FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dfa.c
Date: 2026-04-28 12:28:21
Exec Total Coverage
Lines: 45 59 76.3%
Functions: 3 3 100.0%
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 "demux.h"
27 #include "internal.h"
28
29 7480 static int dfa_probe(const AVProbeData *p)
30 {
31
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 7480 if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
32 7469 return 0;
33
34
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 11 if (AV_RL32(p->buf + 16) != 0x80)
35 ✗ return AVPROBE_SCORE_MAX / 4;
36
37 11 return AVPROBE_SCORE_MAX;
38 }
39
40 11 static int dfa_read_header(AVFormatContext *s)
41 {
42 11 AVIOContext *pb = s->pb;
43 AVStream *st;
44 int frames, ret;
45 int version;
46 uint32_t mspf;
47
48
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 11 if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
49 ✗ av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
50 ✗ return AVERROR_INVALIDDATA;
51 }
52
53 11 version = avio_rl16(pb);
54 11 frames = avio_rl16(pb);
55
56 11 st = avformat_new_stream(s, NULL);
57
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 11 if (!st)
58 ✗ return AVERROR(ENOMEM);
59
60 11 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
61 11 st->codecpar->codec_id = AV_CODEC_ID_DFA;
62 11 st->codecpar->width = avio_rl16(pb);
63 11 st->codecpar->height = avio_rl16(pb);
64 11 mspf = avio_rl32(pb);
65
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 11 if (!mspf) {
66 ✗ av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
67 ✗ mspf = 100;
68 }
69 11 avpriv_set_pts_info(st, 24, mspf, 1000);
70 11 avio_skip(pb, 128 - 16); // padding
71 11 st->duration = frames;
72
73
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 11 if ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0)
74 ✗ return ret;
75 11 AV_WL16(st->codecpar->extradata, version);
76
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 11 if (version == 0x100)
77 ✗ st->sample_aspect_ratio = (AVRational){2, 1};
78
79 11 return 0;
80 }
81
82 194 static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
83 {
84 194 AVIOContext *pb = s->pb;
85 uint32_t frame_size;
86 194 int ret, first = 1;
87
88
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 194 if (avio_feof(pb))
89 19 return AVERROR_EOF;
90
91
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 175 if (av_get_packet(pb, pkt, 12) != 12)
92 3 return AVERROR_INVALIDDATA;
93
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 351 while (!avio_feof(pb)) {
94
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 343 if (!first) {
95 171 ret = av_append_packet(pb, pkt, 12);
96
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 171 if (ret < 0) {
97 ✗ return ret;
98 }
99 } else
100 172 first = 0;
101 343 frame_size = AV_RL32(pkt->data + pkt->size - 8);
102
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 343 if (frame_size > INT_MAX - 4) {
103 ✗ av_log(s, AV_LOG_ERROR, "Too large chunk size: %"PRIu32"\n", frame_size);
104 ✗ return AVERROR_INVALIDDATA;
105 }
106
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 343 if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
107
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 164 if (frame_size) {
108 ✗ av_log(s, AV_LOG_WARNING,
109 "skipping %"PRIu32" bytes of end-of-frame marker chunk\n",
110 frame_size);
111 ✗ avio_skip(pb, frame_size);
112 }
113 164 return 0;
114 }
115 179 ret = av_append_packet(pb, pkt, frame_size);
116
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 179 if (ret < 0) {
117 ✗ return ret;
118 }
119 }
120
121 8 return 0;
122 }
123
124 const FFInputFormat ff_dfa_demuxer = {
125 .p.name = "dfa",
126 .p.long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
127 .p.flags = AVFMT_GENERIC_INDEX,
128 .read_probe = dfa_probe,
129 .read_header = dfa_read_header,
130 .read_packet = dfa_read_packet,
131 };
132