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