mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
3.4 KiB
127 lines
3.4 KiB
/* |
|
* 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(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; |
|
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 (ff_get_extradata(s, st->codecpar, pb, VC1_EXTRADATA_SIZE) < 0) |
|
return AVERROR(ENOMEM); |
|
|
|
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, |
|
};
|
|
|