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/*
* Copyright (C) 2017 Paul B Mahol
*
* 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 "libavutil/common.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "video.h"
typedef struct VFRDETContext {
const AVClass *class;
int64_t prev_pts;
int64_t delta;
int64_t min_delta;
int64_t max_delta;
int64_t avg_delta;
uint64_t vfr;
uint64_t cfr;
} VFRDETContext;
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
VFRDETContext *s = ctx->priv;
if (s->prev_pts != AV_NOPTS_VALUE) {
int64_t delta = in->pts - s->prev_pts;
if (s->delta == AV_NOPTS_VALUE) {
s->delta = delta;
s->min_delta = delta;
s->max_delta = delta;
}
if (s->delta != delta) {
s->vfr++;
s->delta = delta;
s->min_delta = FFMIN(delta, s->min_delta);
s->max_delta = FFMAX(delta, s->max_delta);
s->avg_delta += delta;
} else {
s->cfr++;
}
}
s->prev_pts = in->pts;
return ff_filter_frame(ctx->outputs[0], in);
}
static av_cold int init(AVFilterContext *ctx)
{
VFRDETContext *s = ctx->priv;
s->prev_pts = AV_NOPTS_VALUE;
s->delta = AV_NOPTS_VALUE;
s->min_delta = INT64_MAX;
s->max_delta = INT64_MIN;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
VFRDETContext *s = ctx->priv;
av_log(ctx, AV_LOG_INFO, "VFR:%f (%"PRIu64"/%"PRIu64")", s->vfr / (float)(s->vfr + s->cfr), s->vfr, s->cfr);
if (s->vfr)
av_log(ctx, AV_LOG_INFO, " min: %"PRId64" max: %"PRId64" avg: %"PRId64, s->min_delta, s->max_delta, s->avg_delta / s->vfr);
av_log(ctx, AV_LOG_INFO, "\n");
}
static const AVFilterPad vfrdet_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_vfrdet = {
.name = "vfrdet",
.description = NULL_IF_CONFIG_SMALL("Variable frame rate detect filter."),
.priv_size = sizeof(VFRDETContext),
.init = init,
.uninit = uninit,
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(vfrdet_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
};
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