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"
32 #define VC1_EXTRADATA_SIZE 4
34 static int vc1t_probe(AVProbeData *p)
38 if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC)
41 return AVPROBE_SCORE_MAX/2;
44 static int vc1t_read_header(AVFormatContext *s,
45 AVFormatParameters *ap)
47 ByteIOContext *pb = s->pb;
52 frames = get_le24(pb);
53 if(get_byte(pb) != 0xC5 || get_le32(pb) != 4)
56 /* init video codec */
57 st = av_new_stream(s, 0);
61 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
62 st->codec->codec_id = CODEC_ID_WMV3;
64 st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE);
65 st->codec->extradata_size = VC1_EXTRADATA_SIZE;
66 get_buffer(pb, st->codec->extradata, VC1_EXTRADATA_SIZE);
67 st->codec->height = get_le32(pb);
68 st->codec->width = get_le32(pb);
69 if(get_le32(pb) != 0xC)
74 av_set_pts_info(st, 32, 1, 1000);
77 av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n");
80 av_set_pts_info(st, 24, 1, fps);
81 st->duration = frames;
87 static int vc1t_read_packet(AVFormatContext *s,
90 ByteIOContext *pb = s->pb;
98 frame_size = get_le24(pb);
99 if(get_byte(pb) & 0x80)
102 if(av_get_packet(pb, pkt, frame_size) < 0)
104 if(s->streams[0]->time_base.den == 1000)
106 pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0;
112 AVInputFormat vc1t_demuxer = {
114 NULL_IF_CONFIG_SMALL("VC-1 test bitstream format"),
119 .flags = AVFMT_GENERIC_INDEX,