blob: 197c099bc3312f35cfb9edbcfd642ab718efe58c
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 | |
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 | }; |
92 |