PeerStreamer

/*

 * Copyright (c) 2010 Reimar Döffinger

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; 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 != 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);

    avio_flush(pb);

    return 0;

}

AVOutputFormat ff_ivf_muxer = {

    .name = "ivf",

    .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),

    .extensions = "ivf",

    .audio_codec = CODEC_ID_NONE,

    .video_codec = CODEC_ID_VP8,

    .write_header = ivf_write_header,

    .write_packet = ivf_write_packet,

};