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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 "internal.h"
#include "mux.h"
#include "libavutil/intreadwrite.h"
typedef struct IVFEncContext {
unsigned frame_cnt;
uint64_t last_pts, sum_delta_pts, last_pkt_duration;
} IVFEncContext;
static int ivf_init(AVFormatContext *s)
{
AVCodecParameters *par;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
return AVERROR(EINVAL);
}
par = s->streams[0]->codecpar;
if (par->codec_type != AVMEDIA_TYPE_VIDEO ||
!(par->codec_id == AV_CODEC_ID_AV1 ||
par->codec_id == AV_CODEC_ID_VP8 ||
par->codec_id == AV_CODEC_ID_VP9)) {
av_log(s, AV_LOG_ERROR, "Currently only VP8, VP9 and AV1 are supported!\n");
return AVERROR(EINVAL);
}
if (par->codec_id == AV_CODEC_ID_VP9) {
int ret = ff_stream_add_bitstream_filter(s->streams[0], "vp9_superframe", NULL);
if (ret < 0)
return ret;
} else if (par->codec_id == AV_CODEC_ID_AV1) {
int ret = ff_stream_add_bitstream_filter(s->streams[0], "av1_metadata", "td=insert");
if (ret < 0)
return ret;
}
return 0;
}
static int ivf_write_header(AVFormatContext *s)
{
AVCodecParameters *par = s->streams[0]->codecpar;
AVIOContext *pb = s->pb;
avio_write(pb, "DKIF", 4);
avio_wl16(pb, 0); // version
avio_wl16(pb, 32); // header length
avio_wl32(pb,
par->codec_id == AV_CODEC_ID_VP9 ? AV_RL32("VP90") :
par->codec_id == AV_CODEC_ID_VP8 ? AV_RL32("VP80") : AV_RL32("AV01"));
avio_wl16(pb, par->width);
avio_wl16(pb, par->height);
avio_wl32(pb, s->streams[0]->time_base.den);
avio_wl32(pb, s->streams[0]->time_base.num);
avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL); // length is overwritten at the end of muxing
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->last_pkt_duration = pkt->duration;
ctx->frame_cnt++;
ctx->last_pts = pkt->pts;
return 0;
}
static int ivf_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
IVFEncContext *ctx = s->priv_data;
if ((pb->seekable & AVIO_SEEKABLE_NORMAL) &&
(ctx->frame_cnt > 1 || (ctx->frame_cnt == 1 && ctx->last_pkt_duration))) {
int64_t end = avio_tell(pb);
avio_seek(pb, 24, SEEK_SET);
// overwrite the "length" field (duration)
avio_wl32(pb, ctx->last_pkt_duration ?
ctx->sum_delta_pts + ctx->last_pkt_duration :
ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
avio_wl32(pb, 0); // zero out unused bytes
avio_seek(pb, end, SEEK_SET);
}
return 0;
}
static const AVCodecTag codec_ivf_tags[] = {
{ AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
{ AV_CODEC_ID_VP9, MKTAG('V', 'P', '9', '0') },
{ AV_CODEC_ID_AV1, MKTAG('A', 'V', '0', '1') },
{ AV_CODEC_ID_NONE, 0 }
};
const 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,
.init = ivf_init,
.write_header = ivf_write_header,
.write_packet = ivf_write_packet,
.write_trailer = ivf_write_trailer,
.codec_tag = (const AVCodecTag* const []){ codec_ivf_tags, 0 },
};
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