128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
|
/*
|
||
|
|
* VC1 Test Bitstreams Format Demuxer
|
||
|
|
* Copyright (c) 2006, 2008 Konstantin Shishkov
|
||
|
|
*
|
||
|
|
* This file is part of FFmpeg.
|
||
|
|
*
|
||
|
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file
|
||
|
|
* VC1 test bitstream file demuxer
|
||
|
|
* by Konstantin Shishkov
|
||
|
|
* Format specified in SMPTE standard 421 Annex L
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "libavutil/intreadwrite.h"
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "internal.h"
|
||
|
|
|
||
|
|
#define VC1_EXTRADATA_SIZE 4
|
||
|
|
|
||
|
|
static int vc1t_probe(const AVProbeData *p)
|
||
|
|
{
|
||
|
|
uint32_t size;
|
||
|
|
|
||
|
|
if (p->buf_size < 24)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
size = AV_RL32(&p->buf[4]);
|
||
|
|
if (p->buf[3] != 0xC5 || size < 4 || size > p->buf_size - 20 ||
|
||
|
|
AV_RL32(&p->buf[size+16]) != 0xC)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return AVPROBE_SCORE_EXTENSION;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int vc1t_read_header(AVFormatContext *s)
|
||
|
|
{
|
||
|
|
AVIOContext *pb = s->pb;
|
||
|
|
AVStream *st;
|
||
|
|
int frames, ret;
|
||
|
|
uint32_t fps;
|
||
|
|
uint32_t size;
|
||
|
|
|
||
|
|
frames = avio_rl24(pb);
|
||
|
|
if (avio_r8(pb) != 0xC5 || ((size = avio_rl32(pb)) < 4))
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
|
||
|
|
/* init video codec */
|
||
|
|
st = avformat_new_stream(s, NULL);
|
||
|
|
if (!st)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
||
|
|
st->codecpar->codec_id = AV_CODEC_ID_WMV3;
|
||
|
|
|
||
|
|
if ((ret = ff_get_extradata(s, st->codecpar, pb, VC1_EXTRADATA_SIZE)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
avio_skip(pb, size - 4);
|
||
|
|
st->codecpar->height = avio_rl32(pb);
|
||
|
|
st->codecpar->width = avio_rl32(pb);
|
||
|
|
if(avio_rl32(pb) != 0xC)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
avio_skip(pb, 8);
|
||
|
|
fps = avio_rl32(pb);
|
||
|
|
if(fps == 0xFFFFFFFF)
|
||
|
|
avpriv_set_pts_info(st, 32, 1, 1000);
|
||
|
|
else{
|
||
|
|
if (!fps) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n");
|
||
|
|
fps = 1;
|
||
|
|
}
|
||
|
|
avpriv_set_pts_info(st, 24, 1, fps);
|
||
|
|
st->duration = frames;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int vc1t_read_packet(AVFormatContext *s,
|
||
|
|
AVPacket *pkt)
|
||
|
|
{
|
||
|
|
AVIOContext *pb = s->pb;
|
||
|
|
int frame_size;
|
||
|
|
int keyframe = 0;
|
||
|
|
uint32_t pts;
|
||
|
|
|
||
|
|
if(avio_feof(pb))
|
||
|
|
return AVERROR(EIO);
|
||
|
|
|
||
|
|
frame_size = avio_rl24(pb);
|
||
|
|
if(avio_r8(pb) & 0x80)
|
||
|
|
keyframe = 1;
|
||
|
|
pts = avio_rl32(pb);
|
||
|
|
if(av_get_packet(pb, pkt, frame_size) < 0)
|
||
|
|
return AVERROR(EIO);
|
||
|
|
if(s->streams[0]->time_base.den == 1000)
|
||
|
|
pkt->pts = pts;
|
||
|
|
pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0;
|
||
|
|
pkt->pos -= 8;
|
||
|
|
|
||
|
|
return pkt->size;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVInputFormat ff_vc1t_demuxer = {
|
||
|
|
.name = "vc1test",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
|
||
|
|
.read_probe = vc1t_probe,
|
||
|
|
.read_header = vc1t_read_header,
|
||
|
|
.read_packet = vc1t_read_packet,
|
||
|
|
.extensions = "rcv",
|
||
|
|
.flags = AVFMT_GENERIC_INDEX,
|
||
|
|
};
|