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ffmpeg / libavformat / ivfdec.c @ e63a3628

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/*
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 * Copyright (c) 2010 David Conrad
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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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#include "avformat.h"
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#include "riff.h"
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#include "libavutil/intreadwrite.h"
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static int probe(AVProbeData *p)
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{
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    if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
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        && !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
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        return AVPROBE_SCORE_MAX-2;
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    return 0;
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}
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static int read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    AVStream *st;
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    AVRational time_base;
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    avio_rl32(s->pb); // DKIF
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    avio_rl16(s->pb); // version
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    avio_rl16(s->pb); // header size
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    st->codec->codec_tag  = avio_rl32(s->pb);
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    st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
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    st->codec->width      = avio_rl16(s->pb);
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    st->codec->height     = avio_rl16(s->pb);
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    time_base.den         = avio_rl32(s->pb);
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    time_base.num         = avio_rl32(s->pb);
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    st->duration          = avio_rl64(s->pb);
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    st->need_parsing      = AVSTREAM_PARSE_HEADERS;
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    if (!time_base.den || !time_base.num) {
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        av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
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        return AVERROR_INVALIDDATA;
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    }
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    av_set_pts_info(st, 64, time_base.num, time_base.den);
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    return 0;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    int ret, size = avio_rl32(s->pb);
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    int64_t   pts = avio_rl64(s->pb);
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    ret = av_get_packet(s->pb, pkt, size);
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    pkt->stream_index = 0;
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    pkt->pts          = pts;
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    pkt->pos         -= 12;
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    return ret;
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}
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AVInputFormat ff_ivf_demuxer = {
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    "ivf",
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    NULL_IF_CONFIG_SMALL("On2 IVF"),
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    0,
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    probe,
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    read_header,
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    read_packet,
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    .flags= AVFMT_GENERIC_INDEX,
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    .codec_tag = (const AVCodecTag*[]){ff_codec_bmp_tags, 0},
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};