2 * VC1 Test Bitstreams Format Demuxer
3 * Copyright (c) 2006, 2008 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
24 * VC1 test bitstream file demuxer
25 * by Konstantin Shishkov
26 * Format specified in SMPTE standard 421 Annex L
29 #include "libavutil/intreadwrite.h"
33 #define VC1_EXTRADATA_SIZE 4
35 static int vc1t_probe(const AVProbeData *p)
42 size = AV_RL32(&p->buf[4]);
43 if (p->buf[3] != 0xC5 || size < 4 || size > p->buf_size - 20 ||
44 AV_RL32(&p->buf[size+16]) != 0xC)
47 return AVPROBE_SCORE_EXTENSION;
50 static int vc1t_read_header(AVFormatContext *s)
52 AVIOContext *pb = s->pb;
58 frames = avio_rl24(pb);
59 if (avio_r8(pb) != 0xC5 || ((size = avio_rl32(pb)) < 4))
60 return AVERROR_INVALIDDATA;
62 /* init video codec */
63 st = avformat_new_stream(s, NULL);
65 return AVERROR(ENOMEM);
67 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
68 st->codecpar->codec_id = AV_CODEC_ID_WMV3;
70 if (ff_get_extradata(s, st->codecpar, pb, VC1_EXTRADATA_SIZE) < 0)
71 return AVERROR(ENOMEM);
73 avio_skip(pb, size - 4);
74 st->codecpar->height = avio_rl32(pb);
75 st->codecpar->width = avio_rl32(pb);
76 if(avio_rl32(pb) != 0xC)
77 return AVERROR_INVALIDDATA;
81 avpriv_set_pts_info(st, 32, 1, 1000);
84 av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n");
87 avpriv_set_pts_info(st, 24, 1, fps);
88 st->duration = frames;
94 static int vc1t_read_packet(AVFormatContext *s,
97 AVIOContext *pb = s->pb;
105 frame_size = avio_rl24(pb);
106 if(avio_r8(pb) & 0x80)
109 if(av_get_packet(pb, pkt, frame_size) < 0)
111 if(s->streams[0]->time_base.den == 1000)
113 pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0;
119 AVInputFormat ff_vc1t_demuxer = {
121 .long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
122 .read_probe = vc1t_probe,
123 .read_header = vc1t_read_header,
124 .read_packet = vc1t_read_packet,
126 .flags = AVFMT_GENERIC_INDEX,