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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-07 11:13:41 +02:00
FFmpeg/libavfilter/vf_field.c
Anton Khirnov 1e7d2007c3 all: use designated initializers for AVOption.unit
Makes it robust against adding fields before it, which will be useful in
following commits.

Majority of the patch generated by the following Coccinelle script:

@@
typedef AVOption;
identifier arr_name;
initializer list il;
initializer list[8] il1;
expression tail;
@@
AVOption arr_name[] = { il, { il1,
- tail
+ .unit = tail
}, ...  };

with some manual changes, as the script:
* has trouble with options defined inside macros
* sometimes does not handle options under an #else branch
* sometimes swallows whitespace
2024-02-14 14:53:41 +01:00

115 lines
3.7 KiB
C

/*
* Copyright (c) 2003 Rich Felker
* 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
* field filter, based on libmpcodecs/vf_field.c by Rich Felker
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
enum FieldType { FIELD_TYPE_TOP = 0, FIELD_TYPE_BOTTOM };
typedef struct FieldContext {
const AVClass *class;
int type; ///< FieldType
int nb_planes; ///< number of planes of the current format
} FieldContext;
#define OFFSET(x) offsetof(FieldContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption field_options[] = {
{"type", "set field type (top or bottom)", OFFSET(type), AV_OPT_TYPE_INT, {.i64=FIELD_TYPE_TOP}, 0, 1, FLAGS, .unit = "field_type" },
{"top", "select top field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_TOP}, INT_MIN, INT_MAX, FLAGS, .unit = "field_type"},
{"bottom", "select bottom field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, .unit = "field_type"},
{NULL}
};
AVFILTER_DEFINE_CLASS(field);
static int config_props_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
FieldContext *field = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
field->nb_planes = av_pix_fmt_count_planes(outlink->format);
outlink->w = inlink->w;
outlink->h = (inlink->h + (field->type == FIELD_TYPE_TOP)) / 2;
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d type:%s -> w:%d h:%d\n",
inlink->w, inlink->h, field->type == FIELD_TYPE_BOTTOM ? "bottom" : "top",
outlink->w, outlink->h);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
{
FieldContext *field = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
int i;
inpicref->height = outlink->h;
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
inpicref->interlaced_frame = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
inpicref->flags &= ~AV_FRAME_FLAG_INTERLACED;
for (i = 0; i < field->nb_planes; i++) {
if (field->type == FIELD_TYPE_BOTTOM)
inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
inpicref->linesize[i] = 2 * inpicref->linesize[i];
}
return ff_filter_frame(outlink, inpicref);
}
static const AVFilterPad field_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad field_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props_output,
},
};
const AVFilter ff_vf_field = {
.name = "field",
.description = NULL_IF_CONFIG_SMALL("Extract a field from the input video."),
.priv_size = sizeof(FieldContext),
FILTER_INPUTS(field_inputs),
FILTER_OUTPUTS(field_outputs),
.priv_class = &field_class,
};