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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 SeparateFieldsContext {
int nb_planes;
AVFrame *second;
} SeparateFieldsContext;
static int config_props_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SeparateFieldsContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
s->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;
return 0;
}
static void extract_field(AVFrame *frame, int nb_planes, int type)
{
int i;
for (i = 0; i < nb_planes; i++) {
if (type)
frame->data[i] = frame->data[i] + frame->linesize[i];
frame->linesize[i] *= 2;
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
{
AVFilterContext *ctx = inlink->dst;
SeparateFieldsContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int ret;
inpicref->height = outlink->h;
inpicref->interlaced_frame = 0;
if (!s->second) {
goto clone;
} else {
AVFrame *second = s->second;
extract_field(second, s->nb_planes, second->top_field_first);
if (second->pts != AV_NOPTS_VALUE &&
inpicref->pts != AV_NOPTS_VALUE)
second->pts += inpicref->pts;
else
second->pts = AV_NOPTS_VALUE;
ret = ff_filter_frame(outlink, second);
if (ret < 0)
return ret;
clone:
s->second = av_frame_clone(inpicref);
if (!s->second)
return AVERROR(ENOMEM);
}
extract_field(inpicref, s->nb_planes, !inpicref->top_field_first);
if (inpicref->pts != AV_NOPTS_VALUE)
inpicref->pts *= 2;
return ff_filter_frame(outlink, inpicref);
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SeparateFieldsContext *s = ctx->priv;
int ret;
ret = ff_request_frame(ctx->inputs[0]);
if (ret == AVERROR_EOF && s->second) {
s->second->pts *= 2;
extract_field(s->second, s->nb_planes, s->second->top_field_first);
ret = ff_filter_frame(outlink, s->second);
s->second = 0;
}
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SeparateFieldsContext *s = ctx->priv;
av_frame_free(&s->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,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter ff_vf_separatefields = {
.name = "separatefields",
.description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
.priv_size = sizeof(SeparateFieldsContext),
.uninit = uninit,
.inputs = separatefields_inputs,
.outputs = separatefields_outputs,
};
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