yading@11: /*
yading@11:  * Copyright (c) 2010 David Conrad
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "riff.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: 
yading@11: static int probe(AVProbeData *p)
yading@11: {
yading@11:     if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
yading@11:         && !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
yading@11:         return AVPROBE_SCORE_MAX-2;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVStream *st;
yading@11:     AVRational time_base;
yading@11: 
yading@11:     avio_rl32(s->pb); // DKIF
yading@11:     avio_rl16(s->pb); // version
yading@11:     avio_rl16(s->pb); // header size
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_tag  = avio_rl32(s->pb);
yading@11:     st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
yading@11:     st->codec->width      = avio_rl16(s->pb);
yading@11:     st->codec->height     = avio_rl16(s->pb);
yading@11:     time_base.den         = avio_rl32(s->pb);
yading@11:     time_base.num         = avio_rl32(s->pb);
yading@11:     st->duration          = avio_rl64(s->pb);
yading@11: 
yading@11:     st->need_parsing      = AVSTREAM_PARSE_HEADERS;
yading@11: 
yading@11:     if (!time_base.den || !time_base.num) {
yading@11:         av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     int ret, size = avio_rl32(s->pb);
yading@11:     int64_t   pts = avio_rl64(s->pb);
yading@11: 
yading@11:     ret = av_get_packet(s->pb, pkt, size);
yading@11:     pkt->stream_index = 0;
yading@11:     pkt->pts          = pts;
yading@11:     pkt->pos         -= 12;
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_ivf_demuxer = {
yading@11:     .name           = "ivf",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("On2 IVF"),
yading@11:     .read_probe     = probe,
yading@11:     .read_header    = read_header,
yading@11:     .read_packet    = read_packet,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11:     .codec_tag      = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },
yading@11: };