1/*
2 * VC1 Test Bitstreams Format Demuxer
3 * Copyright (c) 2006, 2008 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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_MAX/2;
43}
44
45static int vc1t_read_header(AVFormatContext *s,
46                           AVFormatParameters *ap)
47{
48    AVIOContext *pb = s->pb;
49    AVStream *st;
50    int frames;
51    uint32_t fps;
52
53    frames = avio_rl24(pb);
54    if(avio_r8(pb) != 0xC5 || avio_rl32(pb) != 4)
55        return -1;
56
57    /* init video codec */
58    st = avformat_new_stream(s, NULL);
59    if (!st)
60        return -1;
61
62    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
63    st->codec->codec_id = CODEC_ID_WMV3;
64
65    st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE);
66    st->codec->extradata_size = VC1_EXTRADATA_SIZE;
67    avio_read(pb, st->codec->extradata, VC1_EXTRADATA_SIZE);
68    st->codec->height = avio_rl32(pb);
69    st->codec->width = avio_rl32(pb);
70    if(avio_rl32(pb) != 0xC)
71        return -1;
72    avio_skip(pb, 8);
73    fps = avio_rl32(pb);
74    if(fps == 0xFFFFFFFF)
75        avpriv_set_pts_info(st, 32, 1, 1000);
76    else{
77        if (!fps) {
78            av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n");
79            fps = 1;
80        }
81        avpriv_set_pts_info(st, 24, 1, fps);
82        st->duration = frames;
83    }
84
85    return 0;
86}
87
88static int vc1t_read_packet(AVFormatContext *s,
89                           AVPacket *pkt)
90{
91    AVIOContext *pb = s->pb;
92    int frame_size;
93    int keyframe = 0;
94    uint32_t pts;
95
96    if(pb->eof_reached)
97        return AVERROR(EIO);
98
99    frame_size = avio_rl24(pb);
100    if(avio_r8(pb) & 0x80)
101        keyframe = 1;
102    pts = avio_rl32(pb);
103    if(av_get_packet(pb, pkt, frame_size) < 0)
104        return AVERROR(EIO);
105    if(s->streams[0]->time_base.den == 1000)
106        pkt->pts = pts;
107    pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0;
108    pkt->pos -= 8;
109
110    return pkt->size;
111}
112
113AVInputFormat ff_vc1t_demuxer = {
114    .name           = "vc1test",
115    .long_name      = NULL_IF_CONFIG_SMALL("VC-1 test bitstream format"),
116    .read_probe     = vc1t_probe,
117    .read_header    = vc1t_read_header,
118    .read_packet    = vc1t_read_packet,
119    .flags = AVFMT_GENERIC_INDEX,
120};
121