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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 | ||
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->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); | |
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 | }; |