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/*
* Copyright (c) 2012 Stefano Sabatini
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* set field order
*/
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
enum SetFieldMode {
MODE_AUTO = -1,
MODE_BFF,
MODE_TFF,
MODE_PROG,
};
typedef struct SetFieldContext {
const AVClass *class;
int mode; ///< SetFieldMode
} SetFieldContext;
#define OFFSET(x) offsetof(SetFieldContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption setfield_options[] = {
{"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_AUTO}, -1, MODE_PROG, FLAGS, "mode"},
{"auto", "keep the same input field", 0, AV_OPT_TYPE_CONST, {.i64=MODE_AUTO}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"bff", "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"tff", "mark as top-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_TFF}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"prog", "mark as progressive", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PROG}, INT_MIN, INT_MAX, FLAGS, "mode"},
{NULL}
};
AVFILTER_DEFINE_CLASS(setfield);
static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
{
SetFieldContext *setfield = inlink->dst->priv;
if (setfield->mode == MODE_PROG) {
picref->interlaced_frame = 0;
} else if (setfield->mode != MODE_AUTO) {
picref->interlaced_frame = 1;
picref->top_field_first = setfield->mode;
}
return ff_filter_frame(inlink->dst->outputs[0], picref);
}
static const AVFilterPad setfield_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad setfield_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_setfield = {
.name = "setfield",
.description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
.priv_size = sizeof(SetFieldContext),
.priv_class = &setfield_class,
.inputs = setfield_inputs,
.outputs = setfield_outputs,
};
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