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 
25 typedef struct VFRDETContext {
26  const AVClass *class;
27 
28  int64_t prev_pts;
29  int64_t delta;
30  int64_t min_delta;
31  int64_t max_delta;
32  int64_t avg_delta;
33 
34  uint64_t vfr;
35  uint64_t cfr;
37 
39 {
40  AVFilterContext *ctx = inlink->dst;
41  VFRDETContext *s = ctx->priv;
42 
43  if (s->prev_pts != AV_NOPTS_VALUE) {
44  int64_t delta = in->pts - s->prev_pts;
45 
46  if (s->delta == AV_NOPTS_VALUE) {
47  s->delta = delta;
48  s->min_delta = delta;
49  s->max_delta = delta;
50  }
51 
52  if (s->delta != delta) {
53  s->vfr++;
54  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;
58  } else {
59  s->cfr++;
60  }
61  }
62 
63  s->prev_pts = in->pts;
64 
65  return ff_filter_frame(ctx->outputs[0], in);
66 }
67 
69 {
70  VFRDETContext *s = ctx->priv;
71 
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;
76 
77  return 0;
78 }
79 
81 {
82  VFRDETContext *s = ctx->priv;
83 
84  av_log(ctx, AV_LOG_INFO, "VFR:%f (%"PRIu64"/%"PRIu64")", s->vfr / (float)(s->vfr + s->cfr), s->vfr, s->cfr);
85  if (s->vfr)
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");
88 }
89 
90 static const AVFilterPad vfrdet_inputs[] = {
91  {
92  .name = "default",
93  .type = AVMEDIA_TYPE_VIDEO,
94  .filter_frame = filter_frame,
95  },
96  { NULL }
97 };
98 
99 static const AVFilterPad vfrdet_outputs[] = {
100  {
101  .name = "default",
102  .type = AVMEDIA_TYPE_VIDEO,
103  },
104  { NULL }
105 };
106 
108  .name = "vfrdet",
109  .description = NULL_IF_CONFIG_SMALL("Variable frame rate detect filter."),
110  .priv_size = sizeof(VFRDETContext),
111  .init = init,
112  .uninit = uninit,
115 };
opt.h
VFRDETContext::vfr
uint64_t vfr
Definition: vf_vfrdet.c:34
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
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:303
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
VFRDETContext::avg_delta
int64_t avg_delta
Definition: vf_vfrdet.c:32
VFRDETContext
Definition: vf_vfrdet.c:25
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
av_cold
#define av_cold
Definition: attributes.h:90
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
s
#define s(width, name)
Definition: cbs_vp9.c:257
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
ctx
AVFormatContext * ctx
Definition: movenc.c:48
vfrdet_outputs
static const AVFilterPad vfrdet_outputs[]
Definition: vf_vfrdet.c:99
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_vfrdet.c:80
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
vfrdet_inputs
static const AVFilterPad vfrdet_inputs[]
Definition: vf_vfrdet.c:90
VFRDETContext::delta
int64_t delta
Definition: vf_vfrdet.c:29
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:116
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
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:38
common.h
delta
float delta
Definition: vorbis_enc_data.h:430
VFRDETContext::prev_pts
int64_t prev_pts
Definition: vf_vfrdet.c:28
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
VFRDETContext::max_delta
int64_t max_delta
Definition: vf_vfrdet.c:31
AVFilter
Filter definition.
Definition: avfilter.h:145
ff_vf_vfrdet
const AVFilter ff_vf_vfrdet
Definition: vf_vfrdet.c:107
VFRDETContext::min_delta
int64_t min_delta
Definition: vf_vfrdet.c:30
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
VFRDETContext::cfr
uint64_t cfr
Definition: vf_vfrdet.c:35
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_vfrdet.c:68