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avfilter/smartblur: Added alpha layer support

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Andrea Mastroberti 2024-05-17 00:29:01 +02:00 committed by Michael Niedermayer
parent 463c573e6b
commit 90ce54804a
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GPG Key ID: B18E8928B3948D64
3 changed files with 55 additions and 10 deletions
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20
doc/filters.texi
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@ -22653,9 +22653,27 @@ whether a pixel should be blurred or not. The option value must be an
integer in the range [-30,30]. A value of 0 will filter all the image,
a value included in [0,30] will filter flat areas and a value included
in [-30,0] will filter edges. Default value is @option{luma_threshold}.
@item alpha_radius, ar
Set the alpha radius. The option value must be a float number in
the range [0.1,5.0] that specifies the variance of the gaussian filter
used to blur the image (slower if larger). Default value is @option{luma_radius}.
@item alpha_strength, as
Set the alpha strength. The option value must be a float number
in the range [-1.0,1.0] that configures the blurring. A value included
in [0.0,1.0] will blur the image whereas a value included in
[-1.0,0.0] will sharpen the image. Default value is @option{luma_strength}.
@item alpha_threshold, at
Set the alpha threshold used as a coefficient to determine
whether a pixel should be blurred or not. The option value must be an
integer in the range [-30,30]. A value of 0 will filter all the image,
a value included in [0,30] will filter flat areas and a value included
in [-30,0] will filter edges. Default value is @option{luma_threshold}.
@end table
If a chroma option is not explicitly set, the corresponding luma value
If a chroma or alpha option is not explicitly set, the corresponding luma value
is set.
@section sobel

2
libavfilter/version.h
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@ -32,7 +32,7 @@
#include "version_major.h"
#define LIBAVFILTER_VERSION_MINOR 2
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_MICRO 102
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

43
libavfilter/vf_smartblur.c
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@ -54,6 +54,7 @@ typedef struct SmartblurContext {
const AVClass *class;
FilterParam luma;
FilterParam chroma;
FilterParam alpha;
int hsub;
int vsub;
unsigned int sws_flags;
@ -77,6 +78,13 @@ static const AVOption smartblur_options[] = {
{ "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
{ "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
{ "alpha_radius", "set alpha radius", OFFSET(alpha.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
{ "ar" , "set alpha radius", OFFSET(alpha.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
{ "alpha_strength", "set alpha strength", OFFSET(alpha.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
{ "as", "set alpha strength", OFFSET(alpha.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
{ "alpha_threshold", "set alpha threshold", OFFSET(alpha.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
{ "at", "set alpha threshold", OFFSET(alpha.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
{ NULL }
};
@ -94,15 +102,24 @@ static av_cold int init(AVFilterContext *ctx)
if (s->chroma.threshold < THRESHOLD_MIN)
s->chroma.threshold = s->luma.threshold;
s->luma.quality = s->chroma.quality = 3.0;
/* make alpha default to luma values, if not explicitly set */
if (s->alpha.radius < RADIUS_MIN)
s->alpha.radius = s->luma.radius;
if (s->alpha.strength < STRENGTH_MIN)
s->alpha.strength = s->luma.strength;
if (s->alpha.threshold < THRESHOLD_MIN)
s->alpha.threshold = s->luma.threshold;
s->luma.quality = s->chroma.quality = s->alpha.quality = 3.0;
s->sws_flags = SWS_BICUBIC;
av_log(ctx, AV_LOG_VERBOSE,
"luma_radius:%f luma_strength:%f luma_threshold:%d "
"chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n",
"chroma_radius:%f chroma_strength:%f chroma_threshold:%d "
"alpha_radius:%f alpha_strength:%f alpha_threshold:%d\n",
s->luma.radius, s->luma.strength, s->luma.threshold,
s->chroma.radius, s->chroma.strength, s->chroma.threshold);
s->chroma.radius, s->chroma.strength, s->chroma.threshold,
s->alpha.radius, s->alpha.strength, s->alpha.threshold);
return 0;
}
@ -112,13 +129,15 @@ static av_cold void uninit(AVFilterContext *ctx)
sws_freeContext(s->luma.filter_context);
sws_freeContext(s->chroma.filter_context);
sws_freeContext(s->alpha.filter_context);
}
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA422P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_NONE
};
@ -162,6 +181,7 @@ static int config_props(AVFilterLink *inlink)
AV_CEIL_RSHIFT(inlink->w, s->hsub),
AV_CEIL_RSHIFT(inlink->h, s->vsub),
s->sws_flags);
alloc_sws_context(&s->alpha, inlink->w, inlink->h, s->sws_flags);
return 0;
}
@ -261,6 +281,13 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
s->chroma.filter_context);
}
if (inpic->data[3]) {
blur(outpic->data[3], outpic->linesize[3],
inpic->data[3], inpic->linesize[3],
inlink->w, inlink->h, s->alpha.threshold,
s->alpha.filter_context);
}
av_frame_free(&inpic);
return ff_filter_frame(outlink, outpic);
}