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
23 * set field order
24 */
25
26#include "libavutil/opt.h"
27#include "avfilter.h"
28#include "internal.h"
29#include "video.h"
30
31enum SetFieldMode {
32    MODE_AUTO = -1,
33    MODE_BFF,
34    MODE_TFF,
35    MODE_PROG,
36};
37
38typedef struct {
39    const AVClass *class;
40    enum SetFieldMode mode;
41} SetFieldContext;
42
43#define OFFSET(x) offsetof(SetFieldContext, x)
44#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
45
46static 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"},
52    {NULL}
53};
54
55AVFILTER_DEFINE_CLASS(setfield);
56
57static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
58{
59    SetFieldContext *setfield = inlink->dst->priv;
60
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;
66    }
67    return ff_filter_frame(inlink->dst->outputs[0], picref);
68}
69
70static const AVFilterPad setfield_inputs[] = {
71    {
72        .name         = "default",
73        .type         = AVMEDIA_TYPE_VIDEO,
74        .filter_frame = filter_frame,
75    },
76    { NULL }
77};
78
79static const AVFilterPad setfield_outputs[] = {
80    {
81        .name = "default",
82        .type = AVMEDIA_TYPE_VIDEO,
83    },
84    { NULL }
85};
86
87AVFilter ff_vf_setfield = {
88    .name        = "setfield",
89    .description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
90    .priv_size   = sizeof(SetFieldContext),
91    .priv_class  = &setfield_class,
92    .inputs      = setfield_inputs,
93    .outputs     = setfield_outputs,
94};
95