2 * Copyright (c) 2010 David Conrad
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/intreadwrite.h"
26 static int probe(AVProbeData
*p
)
28 if (AV_RL32(p
->buf
) == MKTAG('D','K','I','F')
29 && !AV_RL16(p
->buf
+4) && AV_RL16(p
->buf
+6) == 32)
30 return AVPROBE_SCORE_MAX
-2;
35 static int read_header(AVFormatContext
*s
)
40 avio_rl32(s
->pb
); // DKIF
41 avio_rl16(s
->pb
); // version
42 avio_rl16(s
->pb
); // header size
44 st
= avformat_new_stream(s
, NULL
);
46 return AVERROR(ENOMEM
);
49 st
->codec
->codec_type
= AVMEDIA_TYPE_VIDEO
;
50 st
->codec
->codec_tag
= avio_rl32(s
->pb
);
51 st
->codec
->codec_id
= ff_codec_get_id(ff_codec_bmp_tags
, st
->codec
->codec_tag
);
52 st
->codec
->width
= avio_rl16(s
->pb
);
53 st
->codec
->height
= avio_rl16(s
->pb
);
54 time_base
.den
= avio_rl32(s
->pb
);
55 time_base
.num
= avio_rl32(s
->pb
);
56 st
->duration
= avio_rl64(s
->pb
);
58 st
->need_parsing
= AVSTREAM_PARSE_HEADERS
;
60 if (!time_base
.den
|| !time_base
.num
) {
61 av_log(s
, AV_LOG_ERROR
, "Invalid frame rate\n");
62 return AVERROR_INVALIDDATA
;
65 avpriv_set_pts_info(st
, 64, time_base
.num
, time_base
.den
);
70 static int read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
72 int ret
, size
= avio_rl32(s
->pb
);
73 int64_t pts
= avio_rl64(s
->pb
);
75 ret
= av_get_packet(s
->pb
, pkt
, size
);
76 pkt
->stream_index
= 0;
83 AVInputFormat ff_ivf_demuxer
= {
85 .long_name
= NULL_IF_CONFIG_SMALL("On2 IVF"),
87 .read_header
= read_header
,
88 .read_packet
= read_packet
,
89 .flags
= AVFMT_GENERIC_INDEX
,
90 .codec_tag
= (const AVCodecTag
* const []){ ff_codec_bmp_tags
, 0 },