lavf: make avio_read_partial() public
[libav.git] / libavformat / ivfdec.c
1 /*
2 * Copyright (c) 2010 David Conrad
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; 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
35 static int read_header(AVFormatContext *s)
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
49 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
50 st->codecpar->codec_tag = avio_rl32(s->pb);
51 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codecpar->codec_tag);
52 st->codecpar->width = avio_rl16(s->pb);
53 st->codecpar->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
58 st->need_parsing = AVSTREAM_PARSE_HEADERS;
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
70 static int read_packet(AVFormatContext *s, AVPacket *pkt)
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
83 AVInputFormat ff_ivf_demuxer = {
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 };