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lavfi: add field filter

Browse Source 
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.
pull/6/merge
Stefano Sabatini 12 years ago
parent dc239b3b40
commit 3c4aa50620
9 changed files with 278 additions and 2 deletions
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  1. 1
      Changelog
  2. 25
      doc/filters.texi
  3. 1
      libavfilter/Makefile
  4. 1
      libavfilter/allfilters.c
  5. 4
      libavfilter/version.h
  6. 145
      libavfilter/vf_field.c
  7. 1
      tests/fate/avfilter.mak
  8. 1
      tests/lavfi-regression.sh
  9. 101
      tests/ref/lavfi/field

1
Changelog
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@ -18,6 +18,7 @@ version <next>:
- LVF demuxer - LVF demuxer
- ffescape tool - ffescape tool
- metadata (info chunk) support in CAF muxer - metadata (info chunk) support in CAF muxer
- field filter ported from libmpcodecs
version 1.0: version 1.0:

25
doc/filters.texi
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@ -2128,6 +2128,31 @@ fade=in:5:20
fade=in:0:25:alpha=1 fade=in:0:25:alpha=1
@end example @end example
@section field
Extract a single field from an interlaced image using stride
arithmetic to avoid wasting CPU time. The output frames are marked as
non-interlaced.
This filter accepts the following named options:
@table @option
@item type
Specify whether to extract the top (if the value is @code{0} or
@code{top}) or the bottom field (if the value is @code{1} or
@code{bottom}).
@end table
If the option key is not specified, the first value sets the @var{type}
option. For example:
@example
field=bottom
@end example
is equivalent to:
@example
field=type=bottom
@end example
@section fieldorder @section fieldorder
Transform the field order of the input video. Transform the field order of the input video.

1
libavfilter/Makefile
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@ -98,6 +98,7 @@ OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o
OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o
OBJS-$(CONFIG_FIELD_FILTER) += vf_field.o
OBJS-$(CONFIG_FIELDORDER_FILTER) += vf_fieldorder.o OBJS-$(CONFIG_FIELDORDER_FILTER) += vf_fieldorder.o
OBJS-$(CONFIG_FIFO_FILTER) += fifo.o OBJS-$(CONFIG_FIFO_FILTER) += fifo.o
OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o

1
libavfilter/allfilters.c
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@ -90,6 +90,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (DRAWTEXT, drawtext, vf); REGISTER_FILTER (DRAWTEXT, drawtext, vf);
REGISTER_FILTER (EDGEDETECT, edgedetect, vf); REGISTER_FILTER (EDGEDETECT, edgedetect, vf);
REGISTER_FILTER (FADE, fade, vf); REGISTER_FILTER (FADE, fade, vf);
REGISTER_FILTER (FIELD, field, vf);
REGISTER_FILTER (FIELDORDER, fieldorder, vf); REGISTER_FILTER (FIELDORDER, fieldorder, vf);
REGISTER_FILTER (FIFO, fifo, vf); REGISTER_FILTER (FIFO, fifo, vf);
REGISTER_FILTER (FORMAT, format, vf); REGISTER_FILTER (FORMAT, format, vf);

4
libavfilter/version.h
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@ -29,8 +29,8 @@
#include "libavutil/avutil.h" #include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 3 #define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 20 #define LIBAVFILTER_VERSION_MINOR 21
#define LIBAVFILTER_VERSION_MICRO 113 #define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \ #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \ LIBAVFILTER_VERSION_MINOR, \

145
libavfilter/vf_field.c
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@ -0,0 +1,145 @@
/*
* 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"
enum FieldType { FIELD_TYPE_TOP = 0, FIELD_TYPE_BOTTOM };
typedef struct {
const AVClass *class;
enum FieldType type;
int nb_planes; ///< number of planes of the current format
} FieldContext;
#define OFFSET(x) offsetof(FieldContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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}
};
AVFILTER_DEFINE_CLASS(field);
static av_cold int init(AVFilterContext *ctx, const char *args)
{
FieldContext *field = ctx->priv;
static const char *shorthand[] = { "type", NULL };
field->class = &field_class;
av_opt_set_defaults(field);
return av_opt_set_from_string(field, args, shorthand, "=", ":");
}
static int config_props_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
FieldContext *field = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int i;
for (i = 0; i < desc->nb_components; i++)
field->nb_planes = FFMAX(field->nb_planes, desc->comp[i].plane);
field->nb_planes++;
outlink->w = inlink->w;
outlink->h = (inlink->h + (field->type == FIELD_TYPE_TOP)) / 2;
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;
}
static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
{
FieldContext *field = inlink->dst->priv;
AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
AVFilterLink *outlink = inlink->dst->outputs[0];
int i;
if (!outpicref)
return AVERROR(ENOMEM);
outpicref->video->h = outlink->h;
outpicref->video->interlaced = 0;
for (i = 0; i < field->nb_planes; i++) {
if (field->type == FIELD_TYPE_BOTTOM)
outpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
outpicref->linesize[i] = 2 * inpicref->linesize[i];
}
return ff_start_frame(outlink, outpicref);
}
static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
FieldContext *field = inlink->dst->priv;
int y1 = (y + (field->type == FIELD_TYPE_TOP)) / 2;
int h1 = (h + (field->type == FIELD_TYPE_TOP)) / 2;
return ff_draw_slice(inlink->dst->outputs[0], y1, h1, slice_dir);
}
static const AVFilterPad field_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = ff_null_get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.end_frame = ff_null_end_frame,
},
{ NULL }
};
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),
.init = init,
.inputs = field_inputs,
.outputs = field_outputs,
.priv_class = &field_class,
};

1
tests/fate/avfilter.mak
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@ -11,6 +11,7 @@ FATE_LAVFI = fate-lavfi-alphaextract_rgb \
fate-lavfi-drawbox \ fate-lavfi-drawbox \
fate-lavfi-edgedetect \ fate-lavfi-edgedetect \
fate-lavfi-fade \ fate-lavfi-fade \
fate-lavfi-field \
fate-lavfi-idet \ fate-lavfi-idet \
fate-lavfi-life \ fate-lavfi-life \
fate-lavfi-null \ fate-lavfi-null \

1
tests/lavfi-regression.sh
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@ -111,6 +111,7 @@ do_lavfi_pixfmts(){
do_lavfi_pixfmts "copy" "" do_lavfi_pixfmts "copy" ""
do_lavfi_pixfmts "crop" "100:100:100:100" do_lavfi_pixfmts "crop" "100:100:100:100"
do_lavfi_pixfmts "hflip" "" do_lavfi_pixfmts "hflip" ""
do_lavfi_pixfmts "field" "field" "bottom"
do_lavfi_pixfmts "null" "" do_lavfi_pixfmts "null" ""
do_lavfi_pixfmts "pad" "500:400:20:20" do_lavfi_pixfmts "pad" "500:400:20:20"
do_lavfi_pixfmts "pixdesctest" "" do_lavfi_pixfmts "pixdesctest" ""

101
tests/ref/lavfi/field
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