FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_framestep.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 0 13 0.0%
Functions: 0 2 0.0%
Branches: 0 2 0.0%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2012 Stefano Sabatini
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 /**
22 * @file framestep filter, inspired on libmpcodecs/vf_framestep.c by
23 * Daniele Fornighieri <guru AT digitalfantasy it>.
24 */
25
26 #include "libavutil/opt.h"
27 #include "avfilter.h"
28 #include "internal.h"
29 #include "video.h"
30
31 typedef struct NullContext {
32 const AVClass *class;
33 int frame_step;
34 } FrameStepContext;
35
36 #define OFFSET(x) offsetof(FrameStepContext, x)
37 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
38
39 static const AVOption framestep_options[] = {
40 { "step", "set frame step", OFFSET(frame_step), AV_OPT_TYPE_INT, {.i64=1}, 1, INT_MAX, FLAGS},
41 { NULL },
42 };
43
44 AVFILTER_DEFINE_CLASS(framestep);
45
46 static int config_output_props(AVFilterLink *outlink)
47 {
48 AVFilterContext *ctx = outlink->src;
49 FrameStepContext *framestep = ctx->priv;
50 AVFilterLink *inlink = ctx->inputs[0];
51
52 outlink->frame_rate =
53 av_div_q(inlink->frame_rate, (AVRational){framestep->frame_step, 1});
54
55 av_log(ctx, AV_LOG_VERBOSE, "step:%d frame_rate:%d/%d(%f) -> frame_rate:%d/%d(%f)\n",
56 framestep->frame_step,
57 inlink->frame_rate.num, inlink->frame_rate.den, av_q2d(inlink->frame_rate),
58 outlink->frame_rate.num, outlink->frame_rate.den, av_q2d(outlink->frame_rate));
59 return 0;
60 }
61
62 static int filter_frame(AVFilterLink *inlink, AVFrame *ref)
63 {
64 FrameStepContext *framestep = inlink->dst->priv;
65
66 if (!(inlink->frame_count_out % framestep->frame_step)) {
67 return ff_filter_frame(inlink->dst->outputs[0], ref);
68 } else {
69 av_frame_free(&ref);
70 return 0;
71 }
72 }
73
74 static const AVFilterPad framestep_inputs[] = {
75 {
76 .name = "default",
77 .type = AVMEDIA_TYPE_VIDEO,
78 .filter_frame = filter_frame,
79 },
80 };
81
82 static const AVFilterPad framestep_outputs[] = {
83 {
84 .name = "default",
85 .type = AVMEDIA_TYPE_VIDEO,
86 .config_props = config_output_props,
87 },
88 };
89
90 const AVFilter ff_vf_framestep = {
91 .name = "framestep",
92 .description = NULL_IF_CONFIG_SMALL("Select one frame every N frames."),
93 .priv_size = sizeof(FrameStepContext),
94 .priv_class = &framestep_class,
95 FILTER_INPUTS(framestep_inputs),
96 FILTER_OUTPUTS(framestep_outputs),
97 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY,
98 };
99