0,0 → 1,111 |
/* |
* 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" |
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enum FieldType { FIELD_TYPE_TOP = 0, FIELD_TYPE_BOTTOM }; |
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typedef struct { |
const AVClass *class; |
enum FieldType type; |
int nb_planes; ///< number of planes of the current format |
} FieldContext; |
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#define OFFSET(x) offsetof(FieldContext, x) |
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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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} |
}; |
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AVFILTER_DEFINE_CLASS(field); |
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static int config_props_output(AVFilterLink *outlink) |
{ |
AVFilterContext *ctx = outlink->src; |
FieldContext *field = ctx->priv; |
AVFilterLink *inlink = ctx->inputs[0]; |
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field->nb_planes = av_pix_fmt_count_planes(outlink->format); |
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outlink->w = inlink->w; |
outlink->h = (inlink->h + (field->type == FIELD_TYPE_TOP)) / 2; |
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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; |
} |
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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; |
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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); |
} |
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static const AVFilterPad field_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
}, |
{ NULL } |
}; |
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static const AVFilterPad field_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.config_props = config_props_output, |
}, |
{ NULL } |
}; |
|
AVFilter avfilter_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, |
}; |