1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* CD Graphics Demuxer
* Copyright (c) 2009 Michael Tison
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "internal.h"
#define CDG_PACKET_SIZE 24
#define CDG_COMMAND 0x09
#define CDG_MASK 0x3F
typedef struct CDGContext {
int got_first_packet;
} CDGContext;
static int read_header(AVFormatContext *s)
{
AVStream *vst;
int ret;
vst = avformat_new_stream(s, NULL);
if (!vst)
return AVERROR(ENOMEM);
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codec->codec_id = AV_CODEC_ID_CDGRAPHICS;
/// 75 sectors/sec * 4 packets/sector = 300 packets/sec
avpriv_set_pts_info(vst, 32, 1, 300);
ret = avio_size(s->pb);
if (ret > 0)
vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300);
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
CDGContext *priv = s->priv_data;
int ret;
while (1) {
ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
if (ret < 1 || (pkt->data[0] & CDG_MASK) == CDG_COMMAND)
break;
av_free_packet(pkt);
}
if (!priv->got_first_packet) {
pkt->flags |= AV_PKT_FLAG_KEY;
priv->got_first_packet = 1;
}
pkt->stream_index = 0;
return ret;
}
AVInputFormat ff_cdg_demuxer = {
.name = "cdg",
.long_name = NULL_IF_CONFIG_SMALL("CD Graphics"),
.priv_data_size = sizeof(CDGContext),
.read_header = read_header,
.read_packet = read_packet,
.extensions = "cdg",
};
|
