Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / vc1test.c
... / ...
CommitLineData
1/*
2 * VC1 Test Bitstreams Format Demuxer
3 * Copyright (c) 2006, 2008 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * VC1 test bitstream file demuxer
25 * by Konstantin Shishkov
26 * Format specified in SMPTE standard 421 Annex L
27 */
28
29#include "libavutil/intreadwrite.h"
30#include "avformat.h"
31#include "internal.h"
32
33#define VC1_EXTRADATA_SIZE 4
34
35static int vc1t_probe(AVProbeData *p)
36{
37 if (p->buf_size < 24)
38 return 0;
39 if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC)
40 return 0;
41
42 return AVPROBE_SCORE_EXTENSION;
43}
44
45static int vc1t_read_header(AVFormatContext *s)
46{
47 AVIOContext *pb = s->pb;
48 AVStream *st;
49 int frames;
50 uint32_t fps;
51
52 frames = avio_rl24(pb);
53 if(avio_r8(pb) != 0xC5 || avio_rl32(pb) != 4)
54 return AVERROR_INVALIDDATA;
55
56 /* init video codec */
57 st = avformat_new_stream(s, NULL);
58 if (!st)
59 return AVERROR(ENOMEM);
60
61 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
62 st->codec->codec_id = AV_CODEC_ID_WMV3;
63
64 if (ff_get_extradata(st->codec, pb, VC1_EXTRADATA_SIZE) < 0)
65 return AVERROR(ENOMEM);
66 st->codec->height = avio_rl32(pb);
67 st->codec->width = avio_rl32(pb);
68 if(avio_rl32(pb) != 0xC)
69 return AVERROR_INVALIDDATA;
70 avio_skip(pb, 8);
71 fps = avio_rl32(pb);
72 if(fps == 0xFFFFFFFF)
73 avpriv_set_pts_info(st, 32, 1, 1000);
74 else{
75 if (!fps) {
76 av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n");
77 fps = 1;
78 }
79 avpriv_set_pts_info(st, 24, 1, fps);
80 st->duration = frames;
81 }
82
83 return 0;
84}
85
86static int vc1t_read_packet(AVFormatContext *s,
87 AVPacket *pkt)
88{
89 AVIOContext *pb = s->pb;
90 int frame_size;
91 int keyframe = 0;
92 uint32_t pts;
93
94 if(avio_feof(pb))
95 return AVERROR(EIO);
96
97 frame_size = avio_rl24(pb);
98 if(avio_r8(pb) & 0x80)
99 keyframe = 1;
100 pts = avio_rl32(pb);
101 if(av_get_packet(pb, pkt, frame_size) < 0)
102 return AVERROR(EIO);
103 if(s->streams[0]->time_base.den == 1000)
104 pkt->pts = pts;
105 pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0;
106 pkt->pos -= 8;
107
108 return pkt->size;
109}
110
111AVInputFormat ff_vc1t_demuxer = {
112 .name = "vc1test",
113 .long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
114 .read_probe = vc1t_probe,
115 .read_header = vc1t_read_header,
116 .read_packet = vc1t_read_packet,
117 .flags = AVFMT_GENERIC_INDEX,
118};