2 * Copyright (C) 2017 Paul B Mahol
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/common.h"
22 #include "libavutil/opt.h"
25 typedef struct VFRDETContext {
37 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
39 AVFilterContext *ctx = inlink->dst;
40 VFRDETContext *s = ctx->priv;
42 if (s->prev_pts != AV_NOPTS_VALUE) {
43 int64_t delta = in->pts - s->prev_pts;
45 if (s->delta == AV_NOPTS_VALUE) {
49 if (s->delta != delta) {
52 s->min_delta = FFMIN(delta, s->min_delta);
53 s->max_delta = FFMAX(delta, s->max_delta);
59 s->prev_pts = in->pts;
61 return ff_filter_frame(ctx->outputs[0], in);
64 static av_cold int init(AVFilterContext *ctx)
66 VFRDETContext *s = ctx->priv;
68 s->prev_pts = AV_NOPTS_VALUE;
69 s->delta = AV_NOPTS_VALUE;
70 s->min_delta = INT64_MAX;
71 s->max_delta = INT64_MIN;
76 static av_cold void uninit(AVFilterContext *ctx)
78 VFRDETContext *s = ctx->priv;
80 av_log(ctx, AV_LOG_INFO, "VFR:%f (%"PRIu64"/%"PRIu64")", s->vfr / (float)(s->vfr + s->cfr), s->vfr, s->cfr);
82 av_log(ctx, AV_LOG_INFO, " min: %"PRId64" max: %"PRId64")", s->min_delta, s->max_delta);
83 av_log(ctx, AV_LOG_INFO, "\n");
86 static const AVFilterPad vfrdet_inputs[] = {
89 .type = AVMEDIA_TYPE_VIDEO,
90 .filter_frame = filter_frame,
95 static const AVFilterPad vfrdet_outputs[] = {
98 .type = AVMEDIA_TYPE_VIDEO,
103 AVFilter ff_vf_vfrdet = {
105 .description = NULL_IF_CONFIG_SMALL("Variable frame rate detect filter."),
106 .priv_size = sizeof(VFRDETContext),
109 .inputs = vfrdet_inputs,
110 .outputs = vfrdet_outputs,