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+/*

+ * 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;

+    ByteIOContext *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 != CODEC_TYPE_VIDEO || ctx->codec_id != CODEC_ID_VP8) {

+        av_log(s, AV_LOG_ERROR, "Currently only VP8 is supported!\n");

+        return AVERROR(EINVAL);

+    }

+    put_buffer(pb, "DKIF", 4);

+    put_le16(pb, 0); // version

+    put_le16(pb, 32); // header length

+    put_le32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80"));

+    put_le16(pb, ctx->width);

+    put_le16(pb, ctx->height);

+    put_le32(pb, s->streams[0]->time_base.den);

+    put_le32(pb, s->streams[0]->time_base.num);

+    put_le64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!?

+

+    return 0;

+}

+

+static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)

+{

+    ByteIOContext *pb = s->pb;

+    put_le32(pb, pkt->size);

+    put_le64(pb, pkt->pts);

+    put_buffer(pb, pkt->data, pkt->size);

+    put_flush_packet(pb);

+

+    return 0;

+}

+

+AVOutputFormat 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,

+};