libavformat/vc1test.c

   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 vc1test.c
  24  * VC1 test bitstream file demuxer
  25  * by Konstantin Shishkov
  26  * Format specified in SMPTE standard 421 Annex L
  27  */
  28
  29 #include "avformat.h"
  30
  31 #define VC1_EXTRADATA_SIZE 4
  32
  33 static int vc1t_probe(AVProbeData *p)
  34 {
  35     if (p->buf[3] != 0xC5 && AV_RL32(&p->buf[4]) != 4)
  36         return 0;
  37
  38     return AVPROBE_SCORE_MAX/2;
  39 }
  40
  41 static int vc1t_read_header(AVFormatContext *s,
  42                            AVFormatParameters *ap)
  43 {
  44     ByteIOContext *pb = s->pb;
  45     AVStream *st;
  46     int fps, frames;
  47
  48     frames = get_le24(pb);
  49     if(get_byte(pb) != 0xC5 || get_le32(pb) != 4)
  50         return -1;
  51
  52     /* init video codec */
  53     st = av_new_stream(s, 0);
  54     if (!st)
  55         return -1;
  56
  57     st->codec->codec_type = CODEC_TYPE_VIDEO;
  58     st->codec->codec_id = CODEC_ID_WMV3;
  59
  60     st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE);
  61     st->codec->extradata_size = VC1_EXTRADATA_SIZE;
  62     get_buffer(pb, st->codec->extradata, VC1_EXTRADATA_SIZE);
  63     st->codec->height = get_le32(pb);
  64     st->codec->width = get_le32(pb);
  65     if(get_le32(pb) != 0xC)
  66         return -1;
  67     url_fskip(pb, 8);
  68     fps = get_le32(pb);
  69     if(fps == -1)
  70         av_set_pts_info(st, 32, 1, 1000);
  71     else{
  72         av_set_pts_info(st, 24, 1, fps);
  73         st->duration = frames;
  74     }
  75
  76     return 0;
  77 }
  78
  79 static int vc1t_read_packet(AVFormatContext *s,
  80                            AVPacket *pkt)
  81 {
  82     ByteIOContext *pb = s->pb;
  83     int frame_size;
  84     int keyframe = 0;
  85     uint32_t pts;
  86
  87     if(url_feof(pb))
  88         return AVERROR(EIO);
  89
  90     frame_size = get_le24(pb);
  91     if(get_byte(pb) & 0x80)
  92         keyframe = 1;
  93     pts = get_le32(pb);
  94     if(av_get_packet(pb, pkt, frame_size) < 0)
  95         return AVERROR(EIO);
  96     if(s->streams[0]->time_base.den == 1000)
  97         pkt->pts = pts;
  98     pkt->flags |= keyframe ? PKT_FLAG_KEY : 0;
  99     pkt->pos -= 8;
 100
 101     return pkt->size;
 102 }
 103
 104 AVInputFormat vc1t_demuxer = {
 105     "vc1test",
 106     "VC1 test bitstream format",
 107     0,
 108     vc1t_probe,
 109     vc1t_read_header,
 110     vc1t_read_packet,
 111     .flags = AVFMT_GENERIC_INDEX,
 112 };