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https://github.com/FFmpeg/FFmpeg.git
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lavfi: add field filter
The filter is a port of libmpcodecs/vf_field.c, since there is no common code I relicensed it as LGPL, while keeping the original author copyright.
This commit is contained in:
Stefano Sabatini
parent
dc239b3b40
commit
3c4aa50620
@ -18,6 +18,7 @@ version <next>:
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- LVF demuxer
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- ffescape tool
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- metadata (info chunk) support in CAF muxer
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- field filter ported from libmpcodecs
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version 1.0:
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@ -2128,6 +2128,31 @@ fade=in:5:20
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fade=in:0:25:alpha=1
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@end example
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@section field
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Extract a single field from an interlaced image using stride
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arithmetic to avoid wasting CPU time. The output frames are marked as
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non-interlaced.
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This filter accepts the following named options:
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@table @option
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@item type
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Specify whether to extract the top (if the value is @code{0} or
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@code{top}) or the bottom field (if the value is @code{1} or
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@code{bottom}).
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@end table
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If the option key is not specified, the first value sets the @var{type}
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option. For example:
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@example
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field=bottom
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@end example
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is equivalent to:
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@example
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field=type=bottom
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@end example
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@section fieldorder
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Transform the field order of the input video.
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@ -98,6 +98,7 @@ OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
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OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
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OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o
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OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o
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OBJS-$(CONFIG_FIELD_FILTER) += vf_field.o
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OBJS-$(CONFIG_FIELDORDER_FILTER) += vf_fieldorder.o
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OBJS-$(CONFIG_FIFO_FILTER) += fifo.o
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OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
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@ -90,6 +90,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (DRAWTEXT, drawtext, vf);
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REGISTER_FILTER (EDGEDETECT, edgedetect, vf);
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REGISTER_FILTER (FADE, fade, vf);
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REGISTER_FILTER (FIELD, field, vf);
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REGISTER_FILTER (FIELDORDER, fieldorder, vf);
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REGISTER_FILTER (FIFO, fifo, vf);
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REGISTER_FILTER (FORMAT, format, vf);
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@ -29,8 +29,8 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 3
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#define LIBAVFILTER_VERSION_MINOR 20
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#define LIBAVFILTER_VERSION_MICRO 113
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#define LIBAVFILTER_VERSION_MINOR 21
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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145
libavfilter/vf_field.c
Normal file
145
libavfilter/vf_field.c
Normal file
@ -0,0 +1,145 @@
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/*
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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 start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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FieldContext *field = inlink->dst->priv;
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AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
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AVFilterLink *outlink = inlink->dst->outputs[0];
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int i;
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if (!outpicref)
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return AVERROR(ENOMEM);
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outpicref->video->h = outlink->h;
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outpicref->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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outpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
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outpicref->linesize[i] = 2 * inpicref->linesize[i];
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}
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return ff_start_frame(outlink, outpicref);
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}
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static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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FieldContext *field = inlink->dst->priv;
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int y1 = (y + (field->type == FIELD_TYPE_TOP)) / 2;
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int h1 = (h + (field->type == FIELD_TYPE_TOP)) / 2;
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return ff_draw_slice(inlink->dst->outputs[0], y1, h1, slice_dir);
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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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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.end_frame = ff_null_end_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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@ -11,6 +11,7 @@ FATE_LAVFI = fate-lavfi-alphaextract_rgb \
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fate-lavfi-drawbox \
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fate-lavfi-edgedetect \
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fate-lavfi-fade \
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fate-lavfi-field \
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fate-lavfi-idet \
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fate-lavfi-life \
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fate-lavfi-null \
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@ -111,6 +111,7 @@ do_lavfi_pixfmts(){
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do_lavfi_pixfmts "copy" ""
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do_lavfi_pixfmts "crop" "100:100:100:100"
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do_lavfi_pixfmts "hflip" ""
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do_lavfi_pixfmts "field" "field" "bottom"
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do_lavfi_pixfmts "null" ""
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do_lavfi_pixfmts "pad" "500:400:20:20"
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do_lavfi_pixfmts "pixdesctest" ""
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101
tests/ref/lavfi/field
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101
tests/ref/lavfi/field
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@ -0,0 +1,101 @@
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