mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
e6140e7822
This fixes depending on implementation defined behavior Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
112 lines
3.5 KiB
C
112 lines
3.5 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 {
|
|
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, "field_type" },
|
|
{"top", "select top field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_TOP}, INT_MIN, INT_MAX, FLAGS, "field_type"},
|
|
{"bottom", "select bottom field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "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;
|
|
inpicref->interlaced_frame = 0;
|
|
|
|
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,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad field_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_props_output,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_vf_field = {
|
|
.name = "field",
|
|
.description = NULL_IF_CONFIG_SMALL("Extract a field from the input video."),
|
|
.priv_size = sizeof(FieldContext),
|
|
.inputs = field_inputs,
|
|
.outputs = field_outputs,
|
|
.priv_class = &field_class,
|
|
};
|