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 {
38 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
40 AVFilterContext *ctx = inlink->dst;
41 VFRDETContext *s = ctx->priv;
43 if (s->prev_pts != AV_NOPTS_VALUE) {
44 int64_t delta = in->pts - s->prev_pts;
46 if (s->delta == AV_NOPTS_VALUE) {
52 if (s->delta != delta) {
55 s->min_delta = FFMIN(delta, s->min_delta);
56 s->max_delta = FFMAX(delta, s->max_delta);
57 s->avg_delta += delta;
63 s->prev_pts = in->pts;
65 return ff_filter_frame(ctx->outputs[0], in);
68 static av_cold int init(AVFilterContext *ctx)
70 VFRDETContext *s = ctx->priv;
72 s->prev_pts = AV_NOPTS_VALUE;
73 s->delta = AV_NOPTS_VALUE;
74 s->min_delta = INT64_MAX;
75 s->max_delta = INT64_MIN;
80 static av_cold void uninit(AVFilterContext *ctx)
82 VFRDETContext *s = ctx->priv;
84 av_log(ctx, AV_LOG_INFO, "VFR:%f (%"PRIu64"/%"PRIu64")", s->vfr / (float)(s->vfr + s->cfr), s->vfr, s->cfr);
86 av_log(ctx, AV_LOG_INFO, " min: %"PRId64" max: %"PRId64" avg: %"PRId64, s->min_delta, s->max_delta, s->avg_delta / s->vfr);
87 av_log(ctx, AV_LOG_INFO, "\n");
90 static const AVFilterPad vfrdet_inputs[] = {
93 .type = AVMEDIA_TYPE_VIDEO,
94 .filter_frame = filter_frame,
99 static const AVFilterPad vfrdet_outputs[] = {
102 .type = AVMEDIA_TYPE_VIDEO,
107 AVFilter ff_vf_vfrdet = {
109 .description = NULL_IF_CONFIG_SMALL("Variable frame rate detect filter."),
110 .priv_size = sizeof(VFRDETContext),
113 .inputs = vfrdet_inputs,
114 .outputs = vfrdet_outputs,