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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"
typedef struct IVFEncContext {
unsigned frame_cnt;
uint64_t last_pts, sum_delta_pts;
} IVFEncContext;
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 == AV_CODEC_ID_VP8 || ctx->codec_id == AV_CODEC_ID_VP9)) {
av_log(s, AV_LOG_ERROR, "Currently only VP8 and VP9 are 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 : ctx->codec_id == AV_CODEC_ID_VP9 ? AV_RL32("VP90") : 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, 0xFFFFFFFFFFFFFFFFULL);
return 0;
}
static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
IVFEncContext *ctx = s->priv_data;
avio_wl32(pb, pkt->size);
avio_wl64(pb, pkt->pts);
avio_write(pb, pkt->data, pkt->size);
if (ctx->frame_cnt)
ctx->sum_delta_pts += pkt->pts - ctx->last_pts;
ctx->frame_cnt++;
ctx->last_pts = pkt->pts;
return 0;
}
static int ivf_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
if (pb->seekable) {
IVFEncContext *ctx = s->priv_data;
size_t end = avio_tell(pb);
avio_seek(pb, 24, SEEK_SET);
avio_wl64(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
avio_seek(pb, end, SEEK_SET);
}
return 0;
}
AVOutputFormat ff_ivf_muxer = {
.priv_data_size = sizeof(IVFEncContext),
.name = "ivf",
.long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
.extensions = "ivf",
.audio_codec = AV_CODEC_ID_NONE,
.video_codec = AV_CODEC_ID_VP8,
.write_header = ivf_write_header,
.write_packet = ivf_write_packet,
.write_trailer = ivf_write_trailer,
};
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