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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 { | |
35 | const AVClass *class; | |
36 | enum FieldType type; | |
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 | static int config_props_output(AVFilterLink *outlink) | |
53 | { | |
54 | AVFilterContext *ctx = outlink->src; | |
55 | FieldContext *field = ctx->priv; | |
56 | AVFilterLink *inlink = ctx->inputs[0]; | |
57 | ||
58 | field->nb_planes = av_pix_fmt_count_planes(outlink->format); | |
59 | ||
60 | outlink->w = inlink->w; | |
61 | outlink->h = (inlink->h + (field->type == FIELD_TYPE_TOP)) / 2; | |
62 | ||
63 | av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d type:%s -> w:%d h:%d\n", | |
64 | inlink->w, inlink->h, field->type == FIELD_TYPE_BOTTOM ? "bottom" : "top", | |
65 | outlink->w, outlink->h); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) | |
70 | { | |
71 | FieldContext *field = inlink->dst->priv; | |
72 | AVFilterLink *outlink = inlink->dst->outputs[0]; | |
73 | int i; | |
74 | ||
75 | inpicref->height = outlink->h; | |
76 | inpicref->interlaced_frame = 0; | |
77 | ||
78 | for (i = 0; i < field->nb_planes; i++) { | |
79 | if (field->type == FIELD_TYPE_BOTTOM) | |
80 | inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i]; | |
81 | inpicref->linesize[i] = 2 * inpicref->linesize[i]; | |
82 | } | |
83 | 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 | { NULL } | |
93 | }; | |
94 | ||
95 | static const AVFilterPad field_outputs[] = { | |
96 | { | |
97 | .name = "default", | |
98 | .type = AVMEDIA_TYPE_VIDEO, | |
99 | .config_props = config_props_output, | |
100 | }, | |
101 | { NULL } | |
102 | }; | |
103 | ||
104 | AVFilter ff_vf_field = { | |
105 | .name = "field", | |
106 | .description = NULL_IF_CONFIG_SMALL("Extract a field from the input video."), | |
107 | .priv_size = sizeof(FieldContext), | |
108 | .inputs = field_inputs, | |
109 | .outputs = field_outputs, | |
110 | .priv_class = &field_class, | |
111 | }; |