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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; |
AVFrame *second; |
} SeparateFieldsContext; |
|
static int config_props_output(AVFilterLink *outlink) |
{ |
AVFilterContext *ctx = outlink->src; |
SeparateFieldsContext *sf = ctx->priv; |
AVFilterLink *inlink = ctx->inputs[0]; |
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sf->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; |
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; |
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return 0; |
} |
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static void extract_field(AVFrame *frame, int nb_planes, int type) |
{ |
int i; |
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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 *sf = ctx->priv; |
AVFilterLink *outlink = ctx->outputs[0]; |
int ret; |
|
inpicref->height = outlink->h; |
inpicref->interlaced_frame = 0; |
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if (!sf->second) { |
goto clone; |
} else { |
AVFrame *second = sf->second; |
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extract_field(second, sf->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; |
else |
second->pts = AV_NOPTS_VALUE; |
|
ret = ff_filter_frame(outlink, second); |
if (ret < 0) |
return ret; |
clone: |
sf->second = av_frame_clone(inpicref); |
if (!sf->second) |
return AVERROR(ENOMEM); |
} |
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extract_field(inpicref, sf->nb_planes, !inpicref->top_field_first); |
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if (inpicref->pts != AV_NOPTS_VALUE) |
inpicref->pts *= 2; |
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return ff_filter_frame(outlink, inpicref); |
} |
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static int request_frame(AVFilterLink *outlink) |
{ |
AVFilterContext *ctx = outlink->src; |
SeparateFieldsContext *sf = ctx->priv; |
int ret; |
|
ret = ff_request_frame(ctx->inputs[0]); |
if (ret == AVERROR_EOF && sf->second) { |
sf->second->pts *= 2; |
extract_field(sf->second, sf->nb_planes, sf->second->top_field_first); |
ret = ff_filter_frame(outlink, sf->second); |
sf->second = 0; |
} |
|
return ret; |
} |
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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 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, |
}; |