lavfi: add erosion_opencl, dilation_opencl filters

Add erosion_opencl, dilation_opencl filters. Behave like existing erosion and dilation filters.

configure

@@ -3338,10 +3338,12 @@ deinterlace_vaapi_filter_deps="vaapi"
 delogo_filter_deps="gpl"
 denoise_vaapi_filter_deps="vaapi VAProcPipelineParameterBuffer"
 deshake_filter_select="pixelutils"
+dilation_opencl_filter_deps="opencl"
 drawtext_filter_deps="libfreetype"
 drawtext_filter_suggest="libfontconfig libfribidi"
 elbg_filter_deps="avcodec"
 eq_filter_deps="gpl"
+erosion_opencl_filter_deps="opencl"
 fftfilt_filter_deps="avcodec"
 fftfilt_filter_select="rdft"
 fftdnoiz_filter_deps="avcodec"

libavfilter/Makefile

@@ -196,6 +196,8 @@ OBJS-$(CONFIG_DESHAKE_FILTER)                += vf_deshake.o
 OBJS-$(CONFIG_DESPILL_FILTER)                += vf_despill.o
 OBJS-$(CONFIG_DETELECINE_FILTER)             += vf_detelecine.o
 OBJS-$(CONFIG_DILATION_FILTER)               += vf_neighbor.o
+OBJS-$(CONFIG_DILATION_OPENCL_FILTER)        += vf_neighbor_opencl.o opencl.o \
+                                                opencl/neighbor.o
 OBJS-$(CONFIG_DISPLACE_FILTER)               += vf_displace.o framesync.o
 OBJS-$(CONFIG_DOUBLEWEAVE_FILTER)            += vf_weave.o
 OBJS-$(CONFIG_DRAWBOX_FILTER)                += vf_drawbox.o
@@ -207,6 +209,8 @@ OBJS-$(CONFIG_ELBG_FILTER)                   += vf_elbg.o
 OBJS-$(CONFIG_ENTROPY_FILTER)                += vf_entropy.o
 OBJS-$(CONFIG_EQ_FILTER)                     += vf_eq.o
 OBJS-$(CONFIG_EROSION_FILTER)                += vf_neighbor.o
+OBJS-$(CONFIG_EROSION_OPENCL_FILTER)         += vf_neighbor_opencl.o opencl.o \
+                                                opencl/neighbor.o
 OBJS-$(CONFIG_EXTRACTPLANES_FILTER)          += vf_extractplanes.o
 OBJS-$(CONFIG_FADE_FILTER)                   += vf_fade.o
 OBJS-$(CONFIG_FFTDNOIZ_FILTER)               += vf_fftdnoiz.o

libavfilter/allfilters.c

@@ -185,6 +185,7 @@ extern AVFilter ff_vf_deshake;
 extern AVFilter ff_vf_despill;
 extern AVFilter ff_vf_detelecine;
 extern AVFilter ff_vf_dilation;
+extern AVFilter ff_vf_dilation_opencl;
 extern AVFilter ff_vf_displace;
 extern AVFilter ff_vf_doubleweave;
 extern AVFilter ff_vf_drawbox;
@@ -196,6 +197,7 @@ extern AVFilter ff_vf_elbg;
 extern AVFilter ff_vf_entropy;
 extern AVFilter ff_vf_eq;
 extern AVFilter ff_vf_erosion;
+extern AVFilter ff_vf_erosion_opencl;
 extern AVFilter ff_vf_extractplanes;
 extern AVFilter ff_vf_fade;
 extern AVFilter ff_vf_fftdnoiz;

libavfilter/opencl/neighbor.cl

+/*
+ * Copyright (c) 2018 Danil Iashchenko
+ *
+ * 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
+ */
+
+
+__kernel void erosion_global(__write_only image2d_t dst,
+                             __read_only  image2d_t src,
+                             float threshold,
+                             __constant int *coord)
+{
+    const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+                               CLK_ADDRESS_CLAMP_TO_EDGE   |
+                               CLK_FILTER_NEAREST);
+
+    int2 loc = (int2)(get_global_id(0), get_global_id(1));
+
+    float4 px = read_imagef(src, sampler, loc);
+    float limit = px.x - threshold;
+    if (limit < 0) {
+        limit = 0;
+    }
+
+    for (int i = -1; i <= 1; i++) {
+        for (int j = -1; j <= 1; j++) {
+            if (coord[(j + 1) * 3 + (i + 1)] == 1) {
+                float4 cur = read_imagef(src, sampler, loc + (int2)(i, j));
+                if (cur.x < px.x) {
+                    px = cur;
+                }
+            }
+        }
+    }
+    if (limit > px.x) {
+        px = (float4)(limit);
+    }
+    write_imagef(dst, loc, px);
+}
+
+
+__kernel void dilation_global(__write_only image2d_t dst,
+                              __read_only  image2d_t src,
+                              float threshold,
+                              __constant int *coord)
+{
+    const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+                               CLK_ADDRESS_CLAMP_TO_EDGE   |
+                               CLK_FILTER_NEAREST);
+
+    int2 loc = (int2)(get_global_id(0), get_global_id(1));
+
+    float4 px = read_imagef(src, sampler, loc);
+    float limit = px.x + threshold;
+    if (limit > 1) {
+        limit = 1;
+    }
+
+    for (int i = -1; i <= 1; i++) {
+        for (int j = -1; j <= 1; j++) {
+            if (coord[(j + 1) * 3 + (i + 1)] == 1) {
+                float4 cur = read_imagef(src, sampler, loc + (int2)(i, j));
+                if (cur.x > px.x) {
+                    px = cur;
+                }
+            }
+        }
+    }
+    if (limit < px.x) {
+        px = (float4)(limit);
+    }
+    write_imagef(dst, loc, px);
+}

libavfilter/opencl_source.h

@@ -22,6 +22,7 @@
 extern const char *ff_opencl_source_avgblur;
 extern const char *ff_opencl_source_colorspace_common;
 extern const char *ff_opencl_source_convolution;
+extern const char *ff_opencl_source_neighbor;
 extern const char *ff_opencl_source_overlay;
 extern const char *ff_opencl_source_tonemap;
 extern const char *ff_opencl_source_unsharp;