yading@11: /*
yading@11:  * VC1 Test Bitstreams Format Demuxer
yading@11:  * Copyright (c) 2006, 2008 Konstantin Shishkov
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * VC1 test bitstream file demuxer
yading@11:  * by Konstantin Shishkov
yading@11:  * Format specified in SMPTE standard 421 Annex L
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: #define VC1_EXTRADATA_SIZE 4
yading@11: 
yading@11: static int vc1t_probe(AVProbeData *p)
yading@11: {
yading@11:     if (p->buf_size < 24)
yading@11:         return 0;
yading@11:     if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC)
yading@11:         return 0;
yading@11: 
yading@11:     return AVPROBE_SCORE_MAX/2;
yading@11: }
yading@11: 
yading@11: static int vc1t_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st;
yading@11:     int frames;
yading@11:     uint32_t fps;
yading@11: 
yading@11:     frames = avio_rl24(pb);
yading@11:     if(avio_r8(pb) != 0xC5 || avio_rl32(pb) != 4)
yading@11:         return -1;
yading@11: 
yading@11:     /* init video codec */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return -1;
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_WMV3;
yading@11: 
yading@11:     st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE);
yading@11:     st->codec->extradata_size = VC1_EXTRADATA_SIZE;
yading@11:     avio_read(pb, st->codec->extradata, VC1_EXTRADATA_SIZE);
yading@11:     st->codec->height = avio_rl32(pb);
yading@11:     st->codec->width = avio_rl32(pb);
yading@11:     if(avio_rl32(pb) != 0xC)
yading@11:         return -1;
yading@11:     avio_skip(pb, 8);
yading@11:     fps = avio_rl32(pb);
yading@11:     if(fps == 0xFFFFFFFF)
yading@11:         avpriv_set_pts_info(st, 32, 1, 1000);
yading@11:     else{
yading@11:         if (!fps) {
yading@11:             av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n");
yading@11:             fps = 1;
yading@11:         }
yading@11:         avpriv_set_pts_info(st, 24, 1, fps);
yading@11:         st->duration = frames;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int vc1t_read_packet(AVFormatContext *s,
yading@11:                            AVPacket *pkt)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int frame_size;
yading@11:     int keyframe = 0;
yading@11:     uint32_t pts;
yading@11: 
yading@11:     if(url_feof(pb))
yading@11:         return AVERROR(EIO);
yading@11: 
yading@11:     frame_size = avio_rl24(pb);
yading@11:     if(avio_r8(pb) & 0x80)
yading@11:         keyframe = 1;
yading@11:     pts = avio_rl32(pb);
yading@11:     if(av_get_packet(pb, pkt, frame_size) < 0)
yading@11:         return AVERROR(EIO);
yading@11:     if(s->streams[0]->time_base.den == 1000)
yading@11:         pkt->pts = pts;
yading@11:     pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0;
yading@11:     pkt->pos -= 8;
yading@11: 
yading@11:     return pkt->size;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_vc1t_demuxer = {
yading@11:     .name           = "vc1test",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
yading@11:     .read_probe     = vc1t_probe,
yading@11:     .read_header    = vc1t_read_header,
yading@11:     .read_packet    = vc1t_read_packet,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };