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avfilter: add lumakey filter 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
tags/n3.4
Paul B Mahol 8 years ago
parent
dd49eff930
commit
dfc4ce5f5d
6 changed files with 225 additions and 1 deletions
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  1. +1
    -0
      Changelog
  2. +20
    -0
      doc/filters.texi
  3. +1
    -0
      libavfilter/Makefile
  4. +1
    -0
      libavfilter/allfilters.c
  5. +1
    -1
      libavfilter/version.h
  6. +201
    -0
      libavfilter/vf_lumakey.c

+ 1
- 0
Changelog View File

@@ -4,6 +4,7 @@ releases are sorted from youngest to oldest.
version <next>:
- deflicker video filter
- doubleweave video filter
- lumakey video filter

version 3.3:
- CrystalHD decoder moved to new decode API


+ 20
- 0
doc/filters.texi View File

@@ -9278,6 +9278,26 @@ Interpolate values using a tetrahedron.
@end table
@end table

@section lumakey

Turn certain luma values into transparency.

The filter accepts the following options:

@table @option
@item threshold
Set the luma which will be used as base for transparency.
Default value is @code{0}.

@item tolerance
Set the range of luma values to be keyed out.
Default value is @code{0}.

@item softness
Set the range of softness. Default value is @code{0}.
Use this to control gradual transition from zero to full transparency.
@end table

@section lut, lutrgb, lutyuv

Compute a look-up table for binding each pixel component input value


+ 1
- 0
libavfilter/Makefile View File

@@ -212,6 +212,7 @@ OBJS-$(CONFIG_INTERLEAVE_FILTER) += f_interleave.o
OBJS-$(CONFIG_KERNDEINT_FILTER) += vf_kerndeint.o
OBJS-$(CONFIG_LENSCORRECTION_FILTER) += vf_lenscorrection.o
OBJS-$(CONFIG_LOOP_FILTER) += f_loop.o
OBJS-$(CONFIG_LUMAKEY_FILTER) += vf_lumakey.o
OBJS-$(CONFIG_LUT_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUT2_FILTER) += vf_lut2.o framesync.o
OBJS-$(CONFIG_LUT3D_FILTER) += vf_lut3d.o


+ 1
- 0
libavfilter/allfilters.c View File

@@ -223,6 +223,7 @@ static void register_all(void)
REGISTER_FILTER(KERNDEINT, kerndeint, vf);
REGISTER_FILTER(LENSCORRECTION, lenscorrection, vf);
REGISTER_FILTER(LOOP, loop, vf);
REGISTER_FILTER(LUMAKEY, lumakey, vf);
REGISTER_FILTER(LUT, lut, vf);
REGISTER_FILTER(LUT2, lut2, vf);
REGISTER_FILTER(LUT3D, lut3d, vf);


+ 1
- 1
libavfilter/version.h View File

@@ -30,7 +30,7 @@
#include "libavutil/version.h"

#define LIBAVFILTER_VERSION_MAJOR 6
#define LIBAVFILTER_VERSION_MINOR 86
#define LIBAVFILTER_VERSION_MINOR 87
#define LIBAVFILTER_VERSION_MICRO 100

#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \


+ 201
- 0
libavfilter/vf_lumakey.c View File

@@ -0,0 +1,201 @@
/*
* Copyright (c) 2017 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/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

typedef struct LumakeyContext {
const AVClass *class;

int threshold;
int tolerance;
int softness;

int white;
int black;
int max;

int (*do_lumakey_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} LumakeyContext;

static int do_lumakey_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
LumakeyContext *s = ctx->priv;
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
uint8_t *alpha = frame->data[3] + slice_start * frame->linesize[3];
const uint8_t *luma = frame->data[0] + slice_start * frame->linesize[0];
const int so = s->softness;
const int w = s->white;
const int b = s->black;
int x, y;

for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < frame->width; x++) {
if (luma[x] >= b && luma[x] <= w) {
alpha[x] = 0;
} else if (luma[x] > b - so && luma[x] < w + so) {
if (luma[x] < b) {
alpha[x] = 255 - (luma[x] - b + so) * 255 / so;
} else {
alpha[x] = (luma[x] - w) * 255 / so;
}
}
}
luma += frame->linesize[0];
alpha += frame->linesize[3];
}

return 0;
}

static int do_lumakey_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
LumakeyContext *s = ctx->priv;
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
uint16_t *alpha = (uint16_t *)(frame->data[3] + slice_start * frame->linesize[3]);
const uint16_t *luma = (const uint16_t *)(frame->data[0] + slice_start * frame->linesize[0]);
const int so = s->softness;
const int w = s->white;
const int b = s->black;
const int m = s->max;
int x, y;

for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < frame->width; x++) {
if (luma[x] >= b && luma[x] <= w) {
alpha[x] = 0;
} else if (luma[x] > b - so && luma[x] < w + so) {
if (luma[x] < b) {
alpha[x] = m - (luma[x] - b + so) * m / so;
} else {
alpha[x] = (luma[x] - w) * m / so;
}
}
}
luma += frame->linesize[0] / 2;
alpha += frame->linesize[3] / 2;
}

return 0;
}

static int config_input(AVFilterLink *inlink)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
AVFilterContext *ctx = inlink->dst;
LumakeyContext *s = ctx->priv;
int depth;

depth = desc->comp[0].depth;
if (depth == 8) {
s->white = av_clip_uint8(s->threshold + s->tolerance);
s->black = av_clip_uint8(s->threshold - s->tolerance);
s->do_lumakey_slice = do_lumakey_slice8;
} else {
s->max = (1 << depth) - 1;
s->white = av_clip(s->threshold + s->tolerance, 0, s->max);
s->black = av_clip(s->threshold - s->tolerance, 0, s->max);
s->do_lumakey_slice = do_lumakey_slice16;
}

return 0;
}

static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *ctx = link->dst;
LumakeyContext *s = ctx->priv;
int ret;

if (ret = av_frame_make_writable(frame))
return ret;

if (ret = ctx->internal->execute(ctx, s->do_lumakey_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(ctx))))
return ret;

return ff_filter_frame(ctx->outputs[0], frame);
}

static av_cold int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9,
AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10,
AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_NONE
};
AVFilterFormats *formats;

formats = ff_make_format_list(pixel_fmts);
if (!formats)
return AVERROR(ENOMEM);

return ff_set_common_formats(ctx, formats);
}

static const AVFilterPad lumakey_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};

static const AVFilterPad lumakey_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};

#define OFFSET(x) offsetof(LumakeyContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption lumakey_options[] = {
{ "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_INT, {.i64=1}, 0, UINT16_MAX, FLAGS },
{ "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ NULL }
};

AVFILTER_DEFINE_CLASS(lumakey);

AVFilter ff_vf_lumakey = {
.name = "lumakey",
.description = NULL_IF_CONFIG_SMALL("Turns a certain luma into transparency."),
.priv_size = sizeof(LumakeyContext),
.priv_class = &lumakey_class,
.query_formats = query_formats,
.inputs = lumakey_inputs,
.outputs = lumakey_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};

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