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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" |
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#include "filters.h" |
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#include "internal.h"
|
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typedef struct SeparateFieldsContext { |
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int nb_planes; |
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AVFrame *second; |
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} SeparateFieldsContext;
static int config_props_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src; |
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SeparateFieldsContext *s = ctx->priv; |
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AVFilterLink *inlink = ctx->inputs[0];
|
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s->nb_planes = av_pix_fmt_count_planes(inlink->format); |
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if (inlink->h & 1) {
av_log(ctx, AV_LOG_ERROR, "height must be even\n");
return AVERROR_INVALIDDATA;
}
|
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outlink->time_base.num = inlink->time_base.num;
outlink->time_base.den = inlink->time_base.den * 2; |
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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;
}
|
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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;
}
}
|
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
{
AVFilterContext *ctx = inlink->dst; |
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SeparateFieldsContext *s = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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int ret; |
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inpicref->height = outlink->h;
inpicref->interlaced_frame = 0;
|
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if (!s->second) { |
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goto clone;
} else { |
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AVFrame *second = s->second; |
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|
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extract_field(second, s->nb_planes, second->top_field_first); |
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if (second->pts != AV_NOPTS_VALUE &&
inpicref->pts != AV_NOPTS_VALUE)
second->pts += inpicref->pts; |
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else |
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second->pts = AV_NOPTS_VALUE;
ret = ff_filter_frame(outlink, second);
if (ret < 0)
return ret;
clone: |
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s->second = av_frame_clone(inpicref);
if (!s->second) |
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return AVERROR(ENOMEM); |
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}
|
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extract_field(inpicref, s->nb_planes, !inpicref->top_field_first); |
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if (inpicref->pts != AV_NOPTS_VALUE)
inpicref->pts *= 2;
return ff_filter_frame(outlink, inpicref);
}
|
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static int flush_frame(AVFilterLink *outlink, int64_t pts, int64_t *out_pts) |
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{
AVFilterContext *ctx = outlink->src; |
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SeparateFieldsContext *s = ctx->priv; |
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int ret = 0; |
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|
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if (s->second) {
*out_pts = s->second->pts += pts; |
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extract_field(s->second, s->nb_planes, s->second->top_field_first);
ret = ff_filter_frame(outlink, s->second); |
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s->second = NULL; |
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} |
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|
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return ret; |
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}
|
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static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *in;
int64_t pts;
int ret, status;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
ret = ff_inlink_consume_frame(inlink, &in);
if (ret < 0)
return ret;
if (ret > 0)
return filter_frame(inlink, in);
if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
if (status == AVERROR_EOF) {
int64_t out_pts = pts;
ret = flush_frame(outlink, pts, &out_pts);
ff_outlink_set_status(outlink, status, out_pts);
return ret;
}
}
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
|
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static av_cold void uninit(AVFilterContext *ctx)
{
SeparateFieldsContext *s = ctx->priv;
av_frame_free(&s->second);
}
|
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static const AVFilterPad separatefields_inputs[] = {
{ |
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.name = "default",
.type = AVMEDIA_TYPE_VIDEO, |
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},
{ NULL }
};
static const AVFilterPad separatefields_outputs[] = {
{ |
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.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props_output, |
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},
{ NULL }
};
|
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AVFilter ff_vf_separatefields = { |
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.name = "separatefields",
.description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
.priv_size = sizeof(SeparateFieldsContext), |
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.activate = activate, |
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.uninit = uninit, |
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.inputs = separatefields_inputs,
.outputs = separatefields_outputs, |
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}; |