FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/cdg.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 20 22 90.9%
Functions: 2 2 100.0%
Branches: 11 14 78.6%

Line Branch Exec Source
1 /*
2 * CD Graphics Demuxer
3 * Copyright (c) 2009 Michael Tison
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 "avformat.h"
23 #include "internal.h"
24
25 #define CDG_PACKET_SIZE 24
26 #define CDG_COMMAND 0x09
27 #define CDG_MASK 0x3F
28
29 1 static int read_header(AVFormatContext *s)
30 {
31 AVStream *vst;
32 int ret;
33
34 1 vst = avformat_new_stream(s, NULL);
35
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1 if (!vst)
36 return AVERROR(ENOMEM);
37
38 1 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
39 1 vst->codecpar->codec_id = AV_CODEC_ID_CDGRAPHICS;
40
41 /// 75 sectors/sec * 4 packets/sector = 300 packets/sec
42 1 avpriv_set_pts_info(vst, 32, 1, 300);
43
44 1 ret = avio_size(s->pb);
45
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1 if (ret < 0) {
46 av_log(s, AV_LOG_WARNING, "Cannot calculate duration as file size cannot be determined\n");
47 } else
48 1 vst->duration = (ret * (int64_t)vst->time_base.den) / (CDG_PACKET_SIZE * 300);
49
50 1 return 0;
51 }
52
53 304 static int read_packet(AVFormatContext *s, AVPacket *pkt)
54 {
55 int ret;
56
57 304 ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
58 304 pkt->stream_index = 0;
59 304 pkt->dts=
60 304 pkt->pts= pkt->pos / CDG_PACKET_SIZE;
61
62
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304 if (!pkt->pos || (ret > 5 &&
63
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303 (pkt->data[0] & CDG_MASK) == CDG_COMMAND &&
64
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213 (pkt->data[1] & CDG_MASK) == 1 && !(pkt->data[2+2+1] & 0x0F))) {
65 2 pkt->flags = AV_PKT_FLAG_KEY;
66 }
67 304 return ret;
68 }
69
70 const AVInputFormat ff_cdg_demuxer = {
71 .name = "cdg",
72 .long_name = NULL_IF_CONFIG_SMALL("CD Graphics"),
73 .read_header = read_header,
74 .read_packet = read_packet,
75 .flags = AVFMT_GENERIC_INDEX,
76 .extensions = "cdg",
77 };
78