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  1. /*
  2.  * Copyright (c) 2010 Reimar Döffinger
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20. #include "avformat.h"
  21. #include "libavutil/intreadwrite.h"
  22.  
  23. static int ivf_write_header(AVFormatContext *s)
  24. {
  25.     AVCodecContext *ctx;
  26.     AVIOContext *pb = s->pb;
  27.  
  28.     if (s->nb_streams != 1) {
  29.         av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
  30.         return AVERROR(EINVAL);
  31.     }
  32.     ctx = s->streams[0]->codec;
  33.     if (ctx->codec_type != AVMEDIA_TYPE_VIDEO || ctx->codec_id != AV_CODEC_ID_VP8) {
  34.         av_log(s, AV_LOG_ERROR, "Currently only VP8 is supported!\n");
  35.         return AVERROR(EINVAL);
  36.     }
  37.     avio_write(pb, "DKIF", 4);
  38.     avio_wl16(pb, 0); // version
  39.     avio_wl16(pb, 32); // header length
  40.     avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80"));
  41.     avio_wl16(pb, ctx->width);
  42.     avio_wl16(pb, ctx->height);
  43.     avio_wl32(pb, s->streams[0]->time_base.den);
  44.     avio_wl32(pb, s->streams[0]->time_base.num);
  45.     avio_wl64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!?
  46.  
  47.     return 0;
  48. }
  49.  
  50. static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
  51. {
  52.     AVIOContext *pb = s->pb;
  53.     avio_wl32(pb, pkt->size);
  54.     avio_wl64(pb, pkt->pts);
  55.     avio_write(pb, pkt->data, pkt->size);
  56.  
  57.     return 0;
  58. }
  59.  
  60. AVOutputFormat ff_ivf_muxer = {
  61.     .name         = "ivf",
  62.     .long_name    = NULL_IF_CONFIG_SMALL("On2 IVF"),
  63.     .extensions   = "ivf",
  64.     .audio_codec  = AV_CODEC_ID_NONE,
  65.     .video_codec  = AV_CODEC_ID_VP8,
  66.     .write_header = ivf_write_header,
  67.     .write_packet = ivf_write_packet,
  68. };
  69.