[FFmpeg-devel] [PATCH] Added alpha layer support for smartblur
Andrea Mastroberti
10736595 at polimi.it
Mon Mar 25 10:49:50 EET 2024
Signed-off-by: Andrea Mastroberti <10736595 at polimi.it>
---
doc/filters.texi | 20 ++++++++++++++++-
libavfilter/version.h | 2 +-
libavfilter/vf_smartblur.c | 44 ++++++++++++++++++++++++++++++--------
3 files changed, 55 insertions(+), 11 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 913365671d..30b3627724 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -22688,9 +22688,27 @@ 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}.
+
+ at 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 1.0.
+
+ at 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 1.0.
+
+ at 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 0.
@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
diff --git a/libavfilter/version.h b/libavfilter/version.h
index d5a6bc143a..f01b3f8e91 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -32,7 +32,7 @@
#include "version_major.h"
#define LIBAVFILTER_VERSION_MINOR 0
-#define LIBAVFILTER_VERSION_MICRO 100
+#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT
AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_smartblur.c b/libavfilter/vf_smartblur.c
index ae0ec05b2d..bc377d0b92 100644
--- a/libavfilter/vf_smartblur.c
+++ b/libavfilter/vf_smartblur.c
@@ -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=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
+ { "ar" , "set alpha radius", OFFSET(alpha.radius),
AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
+ { "alpha_strength", "set alpha strength", OFFSET(alpha.strength),
AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
+ { "as", "set alpha strength", OFFSET(alpha.strength),
AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
+ { "alpha_threshold", "set alpha threshold",
OFFSET(alpha.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN,
THRESHOLD_MAX, .flags=FLAGS },
+ { "at", "set alpha threshold", OFFSET(alpha.threshold),
AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS },
+
{ NULL }
};
@@ -86,7 +94,7 @@ static av_cold int init(AVFilterContext *ctx)
{
SmartblurContext *s = ctx->priv;
- /* make chroma default to luma values, if not explicitly set */
+ /* make chroma and alpha default to luma values, if not explicitly
set */
if (s->chroma.radius < RADIUS_MIN)
s->chroma.radius = s->luma.radius;
if (s->chroma.strength < STRENGTH_MIN)
@@ -94,15 +102,23 @@ 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;
+ if (s->alpha.radius < RADIUS_MIN)
+ s->alpha.radius = s->alpha.radius;
+ if (s->alpha.strength < STRENGTH_MIN)
+ s->alpha.strength = s->alpha.strength;
+ if (s->alpha.threshold < THRESHOLD_MIN)
+ s->alpha.threshold = s->alpha.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\n"
+ "alpha_radius:%f alpha_strength:%f alpha_threshold:%d ",
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 +128,15 @@ 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 +180,7 @@ 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 +280,13 @@ 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);
}
--
2.44.0
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