--- /dev/null
+/*
+ * 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,
+};