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ffmpeg / libavformat / vc1test.c @ e63a3628

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/*
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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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#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_MAX/2;
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}
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static int vc1t_read_header(AVFormatContext *s,
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                           AVFormatParameters *ap)
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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 -1;
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    /* init video codec */
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    st = av_new_stream(s, 0);
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    if (!st)
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        return -1;
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    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    st->codec->codec_id = CODEC_ID_WMV3;
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    st->codec->extradata = av_malloc(VC1_EXTRADATA_SIZE);
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    st->codec->extradata_size = VC1_EXTRADATA_SIZE;
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    avio_read(pb, st->codec->extradata, VC1_EXTRADATA_SIZE);
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    st->codec->height = avio_rl32(pb);
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    st->codec->width = avio_rl32(pb);
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    if(avio_rl32(pb) != 0xC)
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        return -1;
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    url_fskip(pb, 8);
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    fps = avio_rl32(pb);
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    if(fps == 0xFFFFFFFF)
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        av_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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        av_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(url_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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    "vc1test",
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    NULL_IF_CONFIG_SMALL("VC-1 test bitstream format"),
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    0,
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    vc1t_probe,
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    vc1t_read_header,
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    vc1t_read_packet,
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    .flags = AVFMT_GENERIC_INDEX,
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};