/*
  * Copyright (c) 2010 David Conrad
  *
  * 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
  */
 
 #include "avformat.h"

 #include "internal.h"

 #include "riff.h"
 #include "libavutil/intreadwrite.h"
 
 static int probe(AVProbeData *p)
 {
     if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
         && !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
         return AVPROBE_SCORE_MAX-2;
 
     return 0;
 }
 

 static int read_header(AVFormatContext *s)

 {
     AVStream *st;
     AVRational time_base;
 

     avio_rl32(s->pb); // DKIF
     avio_rl16(s->pb); // version
     avio_rl16(s->pb); // header size

     st = avformat_new_stream(s, NULL);

     if (!st)
         return AVERROR(ENOMEM);
 
 
     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

     st->codec->codec_tag  = avio_rl32(s->pb);

     st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);

     st->codec->width      = avio_rl16(s->pb);
     st->codec->height     = avio_rl16(s->pb);
     time_base.den         = avio_rl32(s->pb);
     time_base.num         = avio_rl32(s->pb);
     st->duration          = avio_rl64(s->pb);

 
     st->need_parsing      = AVSTREAM_PARSE_HEADERS;
 
     if (!time_base.den || !time_base.num) {
         av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
         return AVERROR_INVALIDDATA;
     }
 

     avpriv_set_pts_info(st, 64, time_base.num, time_base.den);

 
     return 0;
 }
 
 static int read_packet(AVFormatContext *s, AVPacket *pkt)
 {

     int ret, size = avio_rl32(s->pb);
     int64_t   pts = avio_rl64(s->pb);

 
     ret = av_get_packet(s->pb, pkt, size);
     pkt->stream_index = 0;
     pkt->pts          = pts;
     pkt->pos         -= 12;
 
     return ret;
 }
 

 AVInputFormat ff_ivf_demuxer = {

     .name           = "ivf",
     .long_name      = NULL_IF_CONFIG_SMALL("On2 IVF"),
     .read_probe     = probe,
     .read_header    = read_header,
     .read_packet    = read_packet,

     .flags          = AVFMT_GENERIC_INDEX,

     .codec_tag      = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },

 };