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ivfdec.c
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1 /*
2  * Copyright (c) 2010 David Conrad
3  *
4  * This file is part of FFmpeg.
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #include "avformat.h"
22 #include "internal.h"
23 #include "riff.h"
24 #include "libavutil/intreadwrite.h"
25 
26 static int probe(AVProbeData *p)
27 {
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;
31 
32  return 0;
33 }
34 
36 {
37  AVStream *st;
38  AVRational time_base;
39 
40  avio_rl32(s->pb); // DKIF
41  avio_rl16(s->pb); // version
42  avio_rl16(s->pb); // header size
43 
44  st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
48 
50  st->codec->codec_tag = avio_rl32(s->pb);
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);
57 
59 
60  if (!time_base.den || !time_base.num) {
61  av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
62  return AVERROR_INVALIDDATA;
63  }
64 
65  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
66 
67  return 0;
68 }
69 
71 {
72  int ret, size = avio_rl32(s->pb);
73  int64_t pts = avio_rl64(s->pb);
74 
75  ret = av_get_packet(s->pb, pkt, size);
76  pkt->stream_index = 0;
77  pkt->pts = pts;
78  pkt->pos -= 12;
79 
80  return ret;
81 }
82 
84  .name = "ivf",
85  .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
86  .read_probe = probe,
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 },
91 };