2 * Copyright (c) 2010 Reimar Döffinger
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/intreadwrite.h"
23 typedef struct IVFEncContext {
25 uint64_t last_pts, sum_delta_pts;
28 static int ivf_write_header(AVFormatContext *s)
31 AVIOContext *pb = s->pb;
33 if (s->nb_streams != 1) {
34 av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
35 return AVERROR(EINVAL);
37 ctx = s->streams[0]->codec;
38 if (ctx->codec_type != AVMEDIA_TYPE_VIDEO ||
39 !(ctx->codec_id == AV_CODEC_ID_VP8 || ctx->codec_id == AV_CODEC_ID_VP9)) {
40 av_log(s, AV_LOG_ERROR, "Currently only VP8 and VP9 are supported!\n");
41 return AVERROR(EINVAL);
43 avio_write(pb, "DKIF", 4);
44 avio_wl16(pb, 0); // version
45 avio_wl16(pb, 32); // header length
46 avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : ctx->codec_id == AV_CODEC_ID_VP9 ? AV_RL32("VP90") : AV_RL32("VP80"));
47 avio_wl16(pb, ctx->width);
48 avio_wl16(pb, ctx->height);
49 avio_wl32(pb, s->streams[0]->time_base.den);
50 avio_wl32(pb, s->streams[0]->time_base.num);
51 avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL);
56 static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
58 AVIOContext *pb = s->pb;
59 IVFEncContext *ctx = s->priv_data;
61 avio_wl32(pb, pkt->size);
62 avio_wl64(pb, pkt->pts);
63 avio_write(pb, pkt->data, pkt->size);
65 ctx->sum_delta_pts += pkt->pts - ctx->last_pts;
67 ctx->last_pts = pkt->pts;
72 static int ivf_write_trailer(AVFormatContext *s)
74 AVIOContext *pb = s->pb;
76 IVFEncContext *ctx = s->priv_data;
77 size_t end = avio_tell(pb);
79 avio_seek(pb, 24, SEEK_SET);
80 avio_wl64(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
81 avio_seek(pb, end, SEEK_SET);
87 AVOutputFormat ff_ivf_muxer = {
88 .priv_data_size = sizeof(IVFEncContext),
90 .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
92 .audio_codec = AV_CODEC_ID_NONE,
93 .video_codec = AV_CODEC_ID_VP8,
94 .write_header = ivf_write_header,
95 .write_packet = ivf_write_packet,
96 .write_trailer = ivf_write_trailer,