1/*
2 * Copyright (c) 2010 Reimar D��ffinger
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
23static 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 ||
34        !(ctx->codec_id == AV_CODEC_ID_VP8 || ctx->codec_id == AV_CODEC_ID_VP9)) {
35        av_log(s, AV_LOG_ERROR, "Currently only VP8 and VP9 are supported!\n");
36        return AVERROR(EINVAL);
37    }
38    avio_write(pb, "DKIF", 4);
39    avio_wl16(pb, 0); // version
40    avio_wl16(pb, 32); // header length
41    avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80"));
42    avio_wl16(pb, ctx->width);
43    avio_wl16(pb, ctx->height);
44    avio_wl32(pb, s->streams[0]->time_base.den);
45    avio_wl32(pb, s->streams[0]->time_base.num);
46    avio_wl64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!?
47
48    return 0;
49}
50
51static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
52{
53    AVIOContext *pb = s->pb;
54    avio_wl32(pb, pkt->size);
55    avio_wl64(pb, pkt->pts);
56    avio_write(pb, pkt->data, pkt->size);
57
58    return 0;
59}
60
61AVOutputFormat 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};
70