/*
  * Copyright (c) 2010 Reimar Döffinger
  *
  * 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 "libavutil/intreadwrite.h"
 
 static int ivf_write_header(AVFormatContext *s)
 {
     AVCodecContext *ctx;

     AVIOContext *pb = s->pb;

 
     if (s->nb_streams != 1) {
         av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
         return AVERROR(EINVAL);
     }
     ctx = s->streams[0]->codec;

     if (ctx->codec_type != AVMEDIA_TYPE_VIDEO || ctx->codec_id != AV_CODEC_ID_VP8) {

         av_log(s, AV_LOG_ERROR, "Currently only VP8 is supported!\n");
         return AVERROR(EINVAL);
     }

     avio_write(pb, "DKIF", 4);
     avio_wl16(pb, 0); // version
     avio_wl16(pb, 32); // header length
     avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80"));
     avio_wl16(pb, ctx->width);
     avio_wl16(pb, ctx->height);
     avio_wl32(pb, s->streams[0]->time_base.den);
     avio_wl32(pb, s->streams[0]->time_base.num);
     avio_wl64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!?

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

     AVIOContext *pb = s->pb;

     avio_wl32(pb, pkt->size);
     avio_wl64(pb, pkt->pts);
     avio_write(pb, pkt->data, pkt->size);

 
     return 0;
 }
 

 AVOutputFormat ff_ivf_muxer = {

     .name         = "ivf",
     .long_name    = NULL_IF_CONFIG_SMALL("On2 IVF"),
     .extensions   = "ivf",

     .audio_codec  = AV_CODEC_ID_NONE,
     .video_codec  = AV_CODEC_ID_VP8,

     .write_header = ivf_write_header,
     .write_packet = ivf_write_packet,
 };