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/*
* Copyright (c) 2013 Paul B Mahol
*
* 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
*/
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
typedef struct {
int nb_planes;
double ts_unit;
} SeparateFieldsContext;
static int config_props_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SeparateFieldsContext *sf = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
sf->nb_planes = av_pix_fmt_count_planes(inlink->format);
if (inlink->h & 1) {
av_log(ctx, AV_LOG_ERROR, "height must be even\n");
return AVERROR_INVALIDDATA;
}
outlink->time_base.num = inlink->time_base.num;
outlink->time_base.den = inlink->time_base.den * 2;
outlink->frame_rate.num = inlink->frame_rate.num * 2;
outlink->frame_rate.den = inlink->frame_rate.den;
outlink->w = inlink->w;
outlink->h = inlink->h / 2;
sf->ts_unit = av_q2d(av_inv_q(av_mul_q(outlink->frame_rate, outlink->time_base)));
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
{
AVFilterContext *ctx = inlink->dst;
SeparateFieldsContext *sf = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *second;
int i, ret;
inpicref->height = outlink->h;
inpicref->interlaced_frame = 0;
second = av_frame_clone(inpicref);
if (!second)
return AVERROR(ENOMEM);
for (i = 0; i < sf->nb_planes; i++) {
if (!inpicref->top_field_first)
inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
else
second->data[i] = second->data[i] + second->linesize[i];
inpicref->linesize[i] *= 2;
second->linesize[i] *= 2;
}
inpicref->pts = outlink->frame_count * sf->ts_unit;
ret = ff_filter_frame(outlink, inpicref);
if (ret < 0) {
av_frame_free(&second);
return ret;
}
second->pts = outlink->frame_count * sf->ts_unit;
return ff_filter_frame(outlink, second);
}
static const AVFilterPad separatefields_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad separatefields_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props_output,
},
{ NULL }
};
AVFilter avfilter_vf_separatefields = {
.name = "separatefields",
.description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
.priv_size = sizeof(SeparateFieldsContext),
.inputs = separatefields_inputs,
.outputs = separatefields_outputs,
};
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