FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_field.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 20 20 100.0%
Functions: 2 2 100.0%
Branches: 4 6 66.7%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2003 Rich Felker
3 * Copyright (c) 2012 Stefano Sabatini
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * field filter, based on libmpcodecs/vf_field.c by Rich Felker
25 */
26
27 #include "libavutil/opt.h"
28 #include "libavutil/pixdesc.h"
29 #include "avfilter.h"
30 #include "internal.h"
31
32 enum FieldType { FIELD_TYPE_TOP = 0, FIELD_TYPE_BOTTOM };
33
34 typedef struct FieldContext {
35 const AVClass *class;
36 int type; ///< FieldType
37 int nb_planes; ///< number of planes of the current format
38 } FieldContext;
39
40 #define OFFSET(x) offsetof(FieldContext, x)
41 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
42
43 static const AVOption field_options[] = {
44 {"type", "set field type (top or bottom)", OFFSET(type), AV_OPT_TYPE_INT, {.i64=FIELD_TYPE_TOP}, 0, 1, FLAGS, "field_type" },
45 {"top", "select top field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_TOP}, INT_MIN, INT_MAX, FLAGS, "field_type"},
46 {"bottom", "select bottom field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "field_type"},
47 {NULL}
48 };
49
50 AVFILTER_DEFINE_CLASS(field);
51
52 178 static int config_props_output(AVFilterLink *outlink)
53 {
54 178 AVFilterContext *ctx = outlink->src;
55 178 FieldContext *field = ctx->priv;
56 178 AVFilterLink *inlink = ctx->inputs[0];
57
58 178 field->nb_planes = av_pix_fmt_count_planes(outlink->format);
59
60 178 outlink->w = inlink->w;
61 178 outlink->h = (inlink->h + (field->type == FIELD_TYPE_TOP)) / 2;
62
63 178 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d type:%s -> w:%d h:%d\n",
64
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178 inlink->w, inlink->h, field->type == FIELD_TYPE_BOTTOM ? "bottom" : "top",
65 outlink->w, outlink->h);
66 178 return 0;
67 }
68
69 178 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
70 {
71 178 FieldContext *field = inlink->dst->priv;
72 178 AVFilterLink *outlink = inlink->dst->outputs[0];
73 int i;
74
75 178 inpicref->height = outlink->h;
76 178 inpicref->interlaced_frame = 0;
77
78
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593 for (i = 0; i < field->nb_planes; i++) {
79
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415 if (field->type == FIELD_TYPE_BOTTOM)
80 415 inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
81 415 inpicref->linesize[i] = 2 * inpicref->linesize[i];
82 }
83 178 return ff_filter_frame(outlink, inpicref);
84 }
85
86 static const AVFilterPad field_inputs[] = {
87 {
88 .name = "default",
89 .type = AVMEDIA_TYPE_VIDEO,
90 .filter_frame = filter_frame,
91 },
92 };
93
94 static const AVFilterPad field_outputs[] = {
95 {
96 .name = "default",
97 .type = AVMEDIA_TYPE_VIDEO,
98 .config_props = config_props_output,
99 },
100 };
101
102 const AVFilter ff_vf_field = {
103 .name = "field",
104 .description = NULL_IF_CONFIG_SMALL("Extract a field from the input video."),
105 .priv_size = sizeof(FieldContext),
106 FILTER_INPUTS(field_inputs),
107 FILTER_OUTPUTS(field_outputs),
108 .priv_class = &field_class,
109 };
110