2 * Copyright (c) 2012 Stefano Sabatini
4 * This file is part of FFmpeg.
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.
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.
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
26 #include "libavutil/opt.h"
40 enum SetFieldMode mode;
43 #define OFFSET(x) offsetof(SetFieldContext, x)
44 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
46 static const AVOption setfield_options[] = {
47 {"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_AUTO}, -1, MODE_PROG, FLAGS, "mode"},
48 {"auto", "keep the same input field", 0, AV_OPT_TYPE_CONST, {.i64=MODE_AUTO}, INT_MIN, INT_MAX, FLAGS, "mode"},
49 {"bff", "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF}, INT_MIN, INT_MAX, FLAGS, "mode"},
50 {"tff", "mark as top-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_TFF}, INT_MIN, INT_MAX, FLAGS, "mode"},
51 {"prog", "mark as progressive", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PROG}, INT_MIN, INT_MAX, FLAGS, "mode"},
55 AVFILTER_DEFINE_CLASS(setfield);
57 static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
59 SetFieldContext *setfield = inlink->dst->priv;
61 if (setfield->mode == MODE_PROG) {
62 picref->interlaced_frame = 0;
63 } else if (setfield->mode != MODE_AUTO) {
64 picref->interlaced_frame = 1;
65 picref->top_field_first = setfield->mode;
67 return ff_filter_frame(inlink->dst->outputs[0], picref);
70 static const AVFilterPad setfield_inputs[] = {
73 .type = AVMEDIA_TYPE_VIDEO,
74 .get_video_buffer = ff_null_get_video_buffer,
75 .filter_frame = filter_frame,
80 static const AVFilterPad setfield_outputs[] = {
83 .type = AVMEDIA_TYPE_VIDEO,
88 AVFilter avfilter_vf_setfield = {
90 .description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
91 .priv_size = sizeof(SetFieldContext),
92 .inputs = setfield_inputs,
93 .outputs = setfield_outputs,
94 .priv_class = &setfield_class,