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(AVProbeData
*p
)
39 if (p
->buf
[3] != 0xC5 || AV_RL32(&p
->buf
[4]) != 4 || AV_RL32(&p
->buf
[20]) != 0xC)
42 return AVPROBE_SCORE_EXTENSION
;
45 static int vc1t_read_header(AVFormatContext
*s
)
47 AVIOContext
*pb
= s
->pb
;
52 frames
= avio_rl24(pb
);
53 if(avio_r8(pb
) != 0xC5 || avio_rl32(pb
) != 4)
54 return AVERROR_INVALIDDATA
;
56 /* init video codec */
57 st
= avformat_new_stream(s
, NULL
);
59 return AVERROR(ENOMEM
);
61 st
->codec
->codec_type
= AVMEDIA_TYPE_VIDEO
;
62 st
->codec
->codec_id
= AV_CODEC_ID_WMV3
;
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
;
73 avpriv_set_pts_info(st
, 32, 1, 1000);
76 av_log(s
, AV_LOG_ERROR
, "Zero FPS specified, defaulting to 1 FPS\n");
79 avpriv_set_pts_info(st
, 24, 1, fps
);
80 st
->duration
= frames
;
86 static int vc1t_read_packet(AVFormatContext
*s
,
89 AVIOContext
*pb
= s
->pb
;
97 frame_size
= avio_rl24(pb
);
98 if(avio_r8(pb
) & 0x80)
101 if(av_get_packet(pb
, pkt
, frame_size
) < 0)
103 if(s
->streams
[0]->time_base
.den
== 1000)
105 pkt
->flags
|= keyframe
? AV_PKT_FLAG_KEY
: 0;
111 AVInputFormat ff_vc1t_demuxer
= {
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
,