132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/*
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* Copyright (c) 2003 Rich Felker
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* Copyright (c) 2012 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* field filter, based on libmpcodecs/vf_field.c by Rich Felker
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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enum FieldType { FIELD_TYPE_TOP = 0, FIELD_TYPE_BOTTOM };
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typedef struct {
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const AVClass *class;
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enum FieldType type;
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int nb_planes; ///< number of planes of the current format
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} FieldContext;
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#define OFFSET(x) offsetof(FieldContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption field_options[] = {
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{"type", "set field type (top or bottom)", OFFSET(type), AV_OPT_TYPE_INT, {.i64=FIELD_TYPE_TOP}, 0, 1, FLAGS, "field_type" },
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{"top", "select top field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_TOP}, INT_MIN, INT_MAX, FLAGS, "field_type"},
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{"bottom", "select bottom field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "field_type"},
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(field);
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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FieldContext *field = ctx->priv;
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static const char *shorthand[] = { "type", NULL };
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field->class = &field_class;
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av_opt_set_defaults(field);
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return av_opt_set_from_string(field, args, shorthand, "=", ":");
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}
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static int config_props_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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FieldContext *field = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int i;
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for (i = 0; i < desc->nb_components; i++)
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field->nb_planes = FFMAX(field->nb_planes, desc->comp[i].plane);
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field->nb_planes++;
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outlink->w = inlink->w;
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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",
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inlink->w, inlink->h, field->type == FIELD_TYPE_BOTTOM ? "bottom" : "top",
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outlink->w, outlink->h);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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FieldContext *field = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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int i;
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inpicref->video->h = outlink->h;
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inpicref->video->interlaced = 0;
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for (i = 0; i < field->nb_planes; i++) {
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if (field->type == FIELD_TYPE_BOTTOM)
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inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
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inpicref->linesize[i] = 2 * inpicref->linesize[i];
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}
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return ff_filter_frame(outlink, inpicref);
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}
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static const AVFilterPad field_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = ff_null_get_video_buffer,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad field_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props_output,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_field = {
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.name = "field",
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.description = NULL_IF_CONFIG_SMALL("Extract a field from the input video."),
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.priv_size = sizeof(FieldContext),
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.init = init,
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.inputs = field_inputs,
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.outputs = field_outputs,
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.priv_class = &field_class,
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};
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