libavformat/ivfenc.c

   1 /*
   2  * Copyright (c) 2010 Reimar Döffinger
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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     avio_flush(pb);
  57
  58     return 0;
  59 }
  60
  61 AVOutputFormat ff_ivf_muxer = {
  62     .name         = "ivf",
  63     .long_name    = NULL_IF_CONFIG_SMALL("On2 IVF"),
  64     .extensions   = "ivf",
  65     .audio_codec  = AV_CODEC_ID_NONE,
  66     .video_codec  = AV_CODEC_ID_VP8,
  67     .write_header = ivf_write_header,
  68     .write_packet = ivf_write_packet,
  69 };