FFmpeg
vf_vfrdet.c
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1 /*
2  * Copyright (C) 2017 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #include "libavutil/common.h"
22 #include "libavutil/opt.h"
23 #include "internal.h"
24 #include "video.h"
25 
26 typedef struct VFRDETContext {
27  const AVClass *class;
28 
29  int64_t prev_pts;
30  int64_t delta;
31  int64_t min_delta;
32  int64_t max_delta;
33  int64_t avg_delta;
34 
35  uint64_t vfr;
36  uint64_t cfr;
38 
40 {
41  AVFilterContext *ctx = inlink->dst;
42  VFRDETContext *s = ctx->priv;
43 
44  if (s->prev_pts != AV_NOPTS_VALUE) {
45  int64_t delta = in->pts - s->prev_pts;
46 
47  if (s->delta == AV_NOPTS_VALUE) {
48  s->delta = delta;
49  s->min_delta = delta;
50  s->max_delta = delta;
51  }
52 
53  if (s->delta != delta) {
54  s->vfr++;
55  s->delta = delta;
56  s->min_delta = FFMIN(delta, s->min_delta);
57  s->max_delta = FFMAX(delta, s->max_delta);
58  s->avg_delta += delta;
59  } else {
60  s->cfr++;
61  }
62  }
63 
64  s->prev_pts = in->pts;
65 
66  return ff_filter_frame(ctx->outputs[0], in);
67 }
68 
70 {
71  VFRDETContext *s = ctx->priv;
72 
73  s->prev_pts = AV_NOPTS_VALUE;
74  s->delta = AV_NOPTS_VALUE;
75  s->min_delta = INT64_MAX;
76  s->max_delta = INT64_MIN;
77 
78  return 0;
79 }
80 
82 {
83  VFRDETContext *s = ctx->priv;
84 
85  av_log(ctx, AV_LOG_INFO, "VFR:%f (%"PRIu64"/%"PRIu64")", s->vfr / (float)(s->vfr + s->cfr), s->vfr, s->cfr);
86  if (s->vfr)
87  av_log(ctx, AV_LOG_INFO, " min: %"PRId64" max: %"PRId64" avg: %"PRId64, s->min_delta, s->max_delta, s->avg_delta / s->vfr);
88  av_log(ctx, AV_LOG_INFO, "\n");
89 }
90 
91 static const AVFilterPad vfrdet_inputs[] = {
92  {
93  .name = "default",
94  .type = AVMEDIA_TYPE_VIDEO,
95  .filter_frame = filter_frame,
96  },
97 };
98 
100  .name = "vfrdet",
101  .description = NULL_IF_CONFIG_SMALL("Variable frame rate detect filter."),
102  .priv_size = sizeof(VFRDETContext),
103  .init = init,
104  .uninit = uninit,
108 };
opt.h
VFRDETContext::vfr
uint64_t vfr
Definition: vf_vfrdet.c:35
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1015
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:375
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:487
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
video.h
VFRDETContext::avg_delta
int64_t avg_delta
Definition: vf_vfrdet.c:33
VFRDETContext
Definition: vf_vfrdet.c:26
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
av_cold
#define av_cold
Definition: attributes.h:90
ff_video_default_filterpad
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
Definition: video.c:37
s
#define s(width, name)
Definition: cbs_vp9.c:198
ctx
AVFormatContext * ctx
Definition: movenc.c:49
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_vfrdet.c:81
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
vfrdet_inputs
static const AVFilterPad vfrdet_inputs[]
Definition: vf_vfrdet.c:91
VFRDETContext::delta
int64_t delta
Definition: vf_vfrdet.c:30
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
internal.h
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_vfrdet.c:39
common.h
delta
float delta
Definition: vorbis_enc_data.h:430
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
VFRDETContext::prev_pts
int64_t prev_pts
Definition: vf_vfrdet.c:29
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
VFRDETContext::max_delta
int64_t max_delta
Definition: vf_vfrdet.c:32
AVFilter
Filter definition.
Definition: avfilter.h:166
ff_vf_vfrdet
const AVFilter ff_vf_vfrdet
Definition: vf_vfrdet.c:99
AVFILTER_FLAG_METADATA_ONLY
#define AVFILTER_FLAG_METADATA_ONLY
The filter is a "metadata" filter - it does not modify the frame data in any way.
Definition: avfilter.h:133
VFRDETContext::min_delta
int64_t min_delta
Definition: vf_vfrdet.c:31
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
VFRDETContext::cfr
uint64_t cfr
Definition: vf_vfrdet.c:36
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_vfrdet.c:69