[FFmpeg-devel] [PATCH] lavfi: add nlmeans_opencl filter

Ruiling Song ruiling.song at intel.com
Mon Apr 1 10:52:34 EEST 2019


Signed-off-by: Ruiling Song <ruiling.song at intel.com>
---
This filter runs about 2x faster on integrated GPU than nlmeans on my Skylake CPU.
Anybody like to give some comments?

Ruiling

 configure                       |   1 +
 doc/filters.texi                |   4 +
 libavfilter/Makefile            |   1 +
 libavfilter/allfilters.c        |   1 +
 libavfilter/opencl/nlmeans.cl   | 108 +++++++++
 libavfilter/opencl_source.h     |   1 +
 libavfilter/vf_nlmeans_opencl.c | 390 ++++++++++++++++++++++++++++++++
 7 files changed, 506 insertions(+)
 create mode 100644 libavfilter/opencl/nlmeans.cl
 create mode 100644 libavfilter/vf_nlmeans_opencl.c

diff --git a/configure b/configure
index f6123f53e5..a233512491 100755
--- a/configure
+++ b/configure
@@ -3460,6 +3460,7 @@ mpdecimate_filter_select="pixelutils"
 minterpolate_filter_select="scene_sad"
 mptestsrc_filter_deps="gpl"
 negate_filter_deps="lut_filter"
+nlmeans_opencl_filter_deps="opencl"
 nnedi_filter_deps="gpl"
 ocr_filter_deps="libtesseract"
 ocv_filter_deps="libopencv"
diff --git a/doc/filters.texi b/doc/filters.texi
index 867607d870..21c2c1a4b5 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -19030,6 +19030,10 @@ Apply erosion filter with threshold0 set to 30, threshold1 set 40, threshold2 se
 @end example
 @end itemize
 
+ at section nlmeans_opencl
+
+Non-local Means denoise filter through OpenCL, this filter accepts same options as @ref{nlmeans}.
+
 @section overlay_opencl
 
 Overlay one video on top of another.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index fef6ec5c55..92039bfdcf 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -291,6 +291,7 @@ OBJS-$(CONFIG_MIX_FILTER)                    += vf_mix.o
 OBJS-$(CONFIG_MPDECIMATE_FILTER)             += vf_mpdecimate.o
 OBJS-$(CONFIG_NEGATE_FILTER)                 += vf_lut.o
 OBJS-$(CONFIG_NLMEANS_FILTER)                += vf_nlmeans.o
+OBJS-$(CONFIG_NLMEANS_OPENCL_FILTER)         += vf_nlmeans_opencl.o opencl.o opencl/nlmeans.o
 OBJS-$(CONFIG_NNEDI_FILTER)                  += vf_nnedi.o
 OBJS-$(CONFIG_NOFORMAT_FILTER)               += vf_format.o
 OBJS-$(CONFIG_NOISE_FILTER)                  += vf_noise.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index c51ae0f3c7..2a6390c92d 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -277,6 +277,7 @@ extern AVFilter ff_vf_mix;
 extern AVFilter ff_vf_mpdecimate;
 extern AVFilter ff_vf_negate;
 extern AVFilter ff_vf_nlmeans;
+extern AVFilter ff_vf_nlmeans_opencl;
 extern AVFilter ff_vf_nnedi;
 extern AVFilter ff_vf_noformat;
 extern AVFilter ff_vf_noise;
diff --git a/libavfilter/opencl/nlmeans.cl b/libavfilter/opencl/nlmeans.cl
new file mode 100644
index 0000000000..dcb04834ca
--- /dev/null
+++ b/libavfilter/opencl/nlmeans.cl
@@ -0,0 +1,108 @@
+/*
+ * 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
+ */
+
+const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+                           CLK_ADDRESS_CLAMP_TO_EDGE   |
+                           CLK_FILTER_NEAREST);
+
+kernel void horiz_sum(__global uint4 *ii,
+                      __read_only image2d_t src,
+                      int width,
+                      int height,
+                      int4 dx,
+                      int4 dy)
+{
+
+    int y = get_global_id(0);
+    int work_size = get_global_size(0);
+
+    uint4 sum = (uint4)(0);
+    float4 s2;
+    for (int i = 0; i < width; i++) {
+        float s1 = read_imagef(src, sampler, (int2)(i, y)).x;
+        s2.x = read_imagef(src, sampler, (int2)(i+dx.x, y+dy.x)).x;
+        s2.y = read_imagef(src, sampler, (int2)(i+dx.y, y+dy.y)).x;
+        s2.z = read_imagef(src, sampler, (int2)(i+dx.z, y+dy.z)).x;
+        s2.w = read_imagef(src, sampler, (int2)(i+dx.w, y+dy.w)).x;
+        sum += convert_uint4((s1-s2)*(s1-s2) * 255*255);
+        ii[y * width + i] = sum;
+    }
+}
+
+kernel void vert_sum(__global uint4 *ii,
+                     int width,
+                     int height)
+{
+    int x = get_global_id(0);
+    uint4 sum = 0;
+    for (int i = 0; i < height; i++) {
+        ii[i * width + x] += sum;
+        sum = ii[i * width + x];
+    }
+}
+
+kernel void weight_accum(global float *sum, global float *weight,
+                         global uint4 *ii, __read_only image2d_t src,
+                         int width, int height, int p, float h,
+                         int4 dx, int4 dy)
+{
+    // w(x) = ii(x-p, y-p) + ii(x+p, y+p) - ii(x+p, y-p) - ii(x-p, y+p)
+    // total_sum[x] += w(x, y) * src(x+dx, y+dy)
+    // total_weight += w(x, y)
+    int x = get_global_id(0);
+    int y = get_global_id(1);
+    int4 xoff = x+dx;
+    int4 yoff = y+dy;
+    uint4 a = 0, b = 0, c = 0, d = 0;
+    uint4 src_pix = 0;
+
+    // out-of-bounding-box?
+    int oobb = (x-p) < 0 || (y-p) < 0 || (y+p) >= height || (x+p) >= width;
+
+    src_pix.x = (int)(255 * read_imagef(src, sampler, (int2)(xoff.x, yoff.x)).x);
+    src_pix.y = (int)(255 * read_imagef(src, sampler, (int2)(xoff.y, yoff.y)).x);
+    src_pix.z = (int)(255 * read_imagef(src, sampler, (int2)(xoff.z, yoff.z)).x);
+    src_pix.w = (int)(255 * read_imagef(src, sampler, (int2)(xoff.w, yoff.w)).x);
+    if (!oobb) {
+        a = ii[(y-p) * width + x - p];
+        b = ii[(y + p) * width + x - p];
+        c = ii[(y-p) * width + x + p];
+        d = ii[(y + p) * width + x + p];
+    }
+
+    float4 patch_diff = convert_float4(d + a - c - b);
+    float4 w = native_exp(-patch_diff/(h*h));
+    float w_sum = w.x + w.y + w.z + w.w;
+    weight[y*width + x] += w_sum;
+    sum[y*width + x] += dot(w, convert_float4(src_pix));
+}
+
+kernel void average(__write_only image2d_t dst,
+                    __read_only image2d_t src,
+                    global float *sum, global float *weight) {
+    int x = get_global_id(0);
+    int y = get_global_id(1);
+    int2 dim = get_image_dim(dst);
+
+    float w = weight[y * dim.x + x];
+    float s = sum[y*dim.x + x];
+    float src_pix = read_imagef(src, sampler, (int2)(x, y)).x;
+    float r = (s + src_pix * 255) / (1.0f + w) / 255.0f;
+    if (x < dim.x && y < dim.y)
+        write_imagef(dst, (int2)(x, y), (float4)(r, 0.0f, 0.0f, 1.0f));
+}
diff --git a/libavfilter/opencl_source.h b/libavfilter/opencl_source.h
index 4118138c30..fd40fd7dca 100644
--- a/libavfilter/opencl_source.h
+++ b/libavfilter/opencl_source.h
@@ -23,6 +23,7 @@ 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_nlmeans;
 extern const char *ff_opencl_source_overlay;
 extern const char *ff_opencl_source_tonemap;
 extern const char *ff_opencl_source_transpose;
diff --git a/libavfilter/vf_nlmeans_opencl.c b/libavfilter/vf_nlmeans_opencl.c
new file mode 100644
index 0000000000..0cc9af10da
--- /dev/null
+++ b/libavfilter/vf_nlmeans_opencl.c
@@ -0,0 +1,390 @@
+/*
+ * 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 <float.h>
+
+#include "libavutil/avassert.h"
+#include "libavutil/common.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "internal.h"
+#include "opencl.h"
+#include "opencl_source.h"
+#include "video.h"
+
+static const enum AVPixelFormat supported_formats[] = {
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_YUV444P,
+    AV_PIX_FMT_GBRP,
+};
+
+static int is_format_supported(enum AVPixelFormat fmt)
+{
+    int i;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++)
+        if (supported_formats[i] == fmt)
+            return 1;
+    return 0;
+}
+
+typedef struct NLMeansOpenCLContext {
+    OpenCLFilterContext   ocf;
+    int                   initialised;
+    cl_kernel             vert_kernel;
+    cl_kernel             horiz_kernel;
+    cl_kernel             accum_kernel;
+    cl_kernel             average_kernel;
+    double                sigma;
+    float                 h;
+    int                   chroma_w;
+    int                   chroma_h;
+    int                   patch_size;
+    int                   patch_size_uv;
+    int                   research_size;
+    int                   research_size_uv;
+    cl_command_queue      command_queue;
+} NLMeansOpenCLContext;
+
+static int nlmeans_opencl_init(AVFilterContext *avctx)
+{
+    NLMeansOpenCLContext *ctx = avctx->priv;
+    cl_int cle;
+    int err;
+
+    ctx->h = ctx->sigma * 10;
+    if (!ctx->research_size_uv)
+        ctx->research_size_uv = ctx->research_size;
+    if (!ctx->patch_size_uv)
+        ctx->patch_size_uv = ctx->patch_size;
+
+    err = ff_opencl_filter_load_program(avctx, &ff_opencl_source_nlmeans, 1);
+    if (err < 0)
+        goto fail;
+
+    ctx->command_queue = clCreateCommandQueue(ctx->ocf.hwctx->context,
+                                              ctx->ocf.hwctx->device_id,
+                                              0, &cle);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create OpenCL "
+                     "command queue %d.\n", cle);
+
+    ctx->vert_kernel = clCreateKernel(ctx->ocf.program, "vert_sum", &cle);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create vert_sum kernel %d.\n", cle);
+
+    ctx->horiz_kernel = clCreateKernel(ctx->ocf.program, "horiz_sum", &cle);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create horiz_sum kernel %d.\n", cle);
+
+    ctx->accum_kernel = clCreateKernel(ctx->ocf.program, "weight_accum", &cle);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create accum kernel %d.\n", cle);
+
+    ctx->average_kernel = clCreateKernel(ctx->ocf.program, "average", &cle);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create average kernel %d.\n", cle);
+
+    ctx->initialised = 1;
+    return 0;
+
+fail:
+    if (ctx->command_queue)
+        clReleaseCommandQueue(ctx->command_queue);
+    if (ctx->vert_kernel)
+        clReleaseKernel(ctx->vert_kernel);
+    if (ctx->horiz_kernel)
+        clReleaseKernel(ctx->horiz_kernel);
+    if (ctx->accum_kernel)
+        clReleaseKernel(ctx->accum_kernel);
+    if (ctx->average_kernel)
+        clReleaseKernel(ctx->average_kernel);
+    return err;
+}
+
+static int nlmeans_plane(AVFilterContext *avctx, cl_mem dst, cl_mem src,
+                         int w, int h, int p, int r)
+{
+    NLMeansOpenCLContext *ctx = avctx->priv;
+    const float zero = 0.0f;
+    const size_t worksize1[] = {h};
+    const size_t worksize2[] = {w};
+    const size_t worksize3[2] = {w, h};
+    int dx, dy, err = 0, weight_buf_size;
+    cl_mem ii, weight, sum;
+    cl_int cle;
+    int nb_pixel, *tmp, *dxdy, idx = 0;
+
+    weight_buf_size = w * h * sizeof(int);
+    ii = clCreateBuffer(ctx->ocf.hwctx->context, 0, 4 * weight_buf_size,
+                               NULL, &cle);
+    weight = clCreateBuffer(ctx->ocf.hwctx->context, 0, weight_buf_size,
+                               NULL, &cle);
+    sum = clCreateBuffer(ctx->ocf.hwctx->context, 0, weight_buf_size,
+                               NULL, &cle);
+    cle = clEnqueueFillBuffer(ctx->command_queue, weight, &zero, sizeof(float),
+                              0, weight_buf_size, 0, NULL, NULL);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to fill weight buffer: %d.\n",
+                     cle);
+    cle = clEnqueueFillBuffer(ctx->command_queue, sum, &zero, sizeof(float),
+                              0, weight_buf_size, 0, NULL, NULL);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to fill sum buffer: %d.\n",
+                     cle);
+
+    nb_pixel = (2*r+1) *(2*r+1)-1;
+    dxdy = av_malloc(nb_pixel * 2 * sizeof(int));
+    tmp = av_malloc(nb_pixel * 2 * sizeof(int));
+
+    if (!dxdy || !tmp)
+        goto fail;
+
+    for (dx = -r; dx <= r; dx++) {
+        for (dy = -r; dy <= r; dy++) {
+            if (dx || dy) {
+                tmp[idx++] = dx;
+                tmp[idx++] = dy;
+            }
+        }
+    }
+    // repack dx/dy seperately, as we want to do four pairs of dx/dy in a batch
+    for (int i = 0; i < nb_pixel/4;i++) {
+        dxdy[i * 8] = tmp[i * 8];         // dx0
+        dxdy[i * 8 + 1] = tmp[i * 8 + 2]; // dx1
+        dxdy[i * 8 + 2] = tmp[i * 8 + 4]; // dx2
+        dxdy[i * 8 + 3] = tmp[i * 8 + 6]; // dx3
+        dxdy[i * 8 + 4] = tmp[i * 8 + 1]; // dy0
+        dxdy[i * 8 + 5] = tmp[i * 8 + 3]; // dy1
+        dxdy[i * 8 + 6] = tmp[i * 8 + 5]; // dy2
+        dxdy[i * 8 + 7] = tmp[i * 8 + 7]; // dy3
+    }
+    av_freep(&tmp);
+
+    for (int i = 0; i < nb_pixel / 4; i++) {
+        int *dx_cur = dxdy + 8 * i;
+        int *dy_cur = dxdy + 8 * i + 4;
+
+        // ii(x,y) = sum of [u(i,y) - u(i+dx,y+dy)]^2 for all i < x
+        CL_SET_KERNEL_ARG(ctx->horiz_kernel, 0, cl_mem, &ii);
+        CL_SET_KERNEL_ARG(ctx->horiz_kernel, 1, cl_mem, &src);
+        CL_SET_KERNEL_ARG(ctx->horiz_kernel, 2, cl_int, &w);
+        CL_SET_KERNEL_ARG(ctx->horiz_kernel, 3, cl_int, &h);
+        CL_SET_KERNEL_ARG(ctx->horiz_kernel, 4, cl_int4, dx_cur);
+        CL_SET_KERNEL_ARG(ctx->horiz_kernel, 5, cl_int4, dy_cur);
+        cle = clEnqueueNDRangeKernel(ctx->command_queue, ctx->horiz_kernel, 1,
+                               NULL, worksize1, NULL, 0, NULL, NULL);
+        CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue horiz_kernel: %d.\n",
+                         cle);
+
+        // ii(x,y) = ii(x,0) + ii(x,1) +...+ ii(x,y-1)
+        CL_SET_KERNEL_ARG(ctx->vert_kernel, 0, cl_mem, &ii);
+        CL_SET_KERNEL_ARG(ctx->vert_kernel, 1, cl_int, &w);
+        CL_SET_KERNEL_ARG(ctx->vert_kernel, 2, cl_int, &h);
+        cle = clEnqueueNDRangeKernel(ctx->command_queue, ctx->vert_kernel,
+                                     1, NULL, worksize2, NULL, 0, NULL, NULL);
+        CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue vert_kernel: %d.\n",
+                         cle);
+
+        // accumlate weights
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 0, cl_mem, &sum);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 1, cl_mem, &weight);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 2, cl_mem, &ii);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 3, cl_mem, &src);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 4, cl_int, &w);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 5, cl_int, &h);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 6, cl_int, &p);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 7, cl_float, &ctx->h);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 8, cl_int4, dx_cur);
+        CL_SET_KERNEL_ARG(ctx->accum_kernel, 9, cl_int4, dy_cur);
+        cle = clEnqueueNDRangeKernel(ctx->command_queue, ctx->accum_kernel,
+                                     2, NULL, worksize3, NULL, 0, NULL, NULL);
+        CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue kernel: %d.\n", cle);
+    }
+    av_freep(&dxdy);
+
+    // average
+    CL_SET_KERNEL_ARG(ctx->average_kernel, 0, cl_mem, &dst);
+    CL_SET_KERNEL_ARG(ctx->average_kernel, 1, cl_mem, &src);
+    CL_SET_KERNEL_ARG(ctx->average_kernel, 2, cl_mem, &sum);
+    CL_SET_KERNEL_ARG(ctx->average_kernel, 3, cl_mem, &weight);
+    cle = clEnqueueNDRangeKernel(ctx->command_queue, ctx->average_kernel, 2,
+                                 NULL, worksize3, NULL, 0, NULL, NULL);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue average kernel: %d.\n",
+                     cle);
+    cle = clFinish(ctx->command_queue);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to finish kernel: %d.\n", cle);
+fail:
+    if (tmp)
+      av_freep(&tmp);
+    if (dxdy)
+      av_freep(&dxdy);
+    clFinish(ctx->command_queue);
+    clReleaseMemObject(ii);
+    clReleaseMemObject(weight);
+    clReleaseMemObject(sum);
+    return err;
+}
+
+static int nlmeans_opencl_filter_frame(AVFilterLink *inlink, AVFrame *input)
+{
+    AVFilterContext    *avctx = inlink->dst;
+    AVFilterLink     *outlink = avctx->outputs[0];
+    NLMeansOpenCLContext *ctx = avctx->priv;
+    AVFrame *output = NULL;
+    AVHWFramesContext *input_frames_ctx;
+    const AVPixFmtDescriptor *desc;
+    enum AVPixelFormat in_format;
+    cl_mem src, dst;
+    int w, h, err, p, patch, research;
+
+    av_log(ctx, AV_LOG_DEBUG, "Filter input: %s, %ux%u (%"PRId64").\n",
+           av_get_pix_fmt_name(input->format),
+           input->width, input->height, input->pts);
+
+    if (!input->hw_frames_ctx)
+        return AVERROR(EINVAL);
+    input_frames_ctx = (AVHWFramesContext*)input->hw_frames_ctx->data;
+    in_format = input_frames_ctx->sw_format;
+
+    output = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!output) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    err = av_frame_copy_props(output, input);
+    if (err < 0)
+        goto fail;
+
+    if (!ctx->initialised) {
+        desc = av_pix_fmt_desc_get(in_format);
+        if (!is_format_supported(in_format)) {
+            err = AVERROR(EINVAL);
+            av_log(avctx, AV_LOG_ERROR, "input format %s not supported\n",
+                   av_get_pix_fmt_name(in_format));
+            goto fail;
+        }
+        ctx->chroma_w = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+        ctx->chroma_h = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+
+        err = nlmeans_opencl_init(avctx);
+        if (err < 0)
+            goto fail;
+    }
+
+    for (p = 0; p < FF_ARRAY_ELEMS(output->data); p++) {
+        src = (cl_mem) input->data[p];
+        dst = (cl_mem) output->data[p];
+
+        if (!dst)
+            break;
+        w = p ? ctx->chroma_w : inlink->w;
+        h = p ? ctx->chroma_h : inlink->h;
+        patch = (p ? ctx->patch_size_uv : ctx->patch_size) / 2;
+        research = (p ? ctx->research_size_uv : ctx->research_size) / 2;
+        err = nlmeans_plane(avctx, dst, src, w, h, patch, research);
+        if (err < 0)
+            goto fail;
+    }
+
+    av_frame_free(&input);
+
+    av_log(ctx, AV_LOG_DEBUG, "Filter output: %s, %ux%u (%"PRId64").\n",
+           av_get_pix_fmt_name(output->format),
+           output->width, output->height, output->pts);
+
+    return ff_filter_frame(outlink, output);
+
+fail:
+    clFinish(ctx->command_queue);
+    av_frame_free(&input);
+    av_frame_free(&output);
+    return err;
+}
+
+#define RELEASE_KERNEL(k)                                    \
+do {                                                         \
+    if (k) {                                                 \
+        cle = clReleaseKernel(k);                            \
+        if (cle != CL_SUCCESS)                               \
+            av_log(avctx, AV_LOG_ERROR, "Failed to release " \
+                   "kernel: %d.\n", cle);                    \
+    }                                                        \
+} while(0)
+
+static av_cold void nlmeans_opencl_uninit(AVFilterContext *avctx)
+{
+    NLMeansOpenCLContext *ctx = avctx->priv;
+    cl_int cle;
+
+    RELEASE_KERNEL(ctx->vert_kernel);
+    RELEASE_KERNEL(ctx->horiz_kernel);
+    RELEASE_KERNEL(ctx->accum_kernel);
+    RELEASE_KERNEL(ctx->average_kernel);
+
+    if (ctx->command_queue) {
+        cle = clReleaseCommandQueue(ctx->command_queue);
+        if (cle != CL_SUCCESS)
+            av_log(avctx, AV_LOG_ERROR, "Failed to release "
+                   "command queue: %d.\n", cle);
+    }
+
+    ff_opencl_filter_uninit(avctx);
+}
+
+#define OFFSET(x) offsetof(NLMeansOpenCLContext, x)
+#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
+static const AVOption nlmeans_opencl_options[] = {
+    { "s",  "denoising strength", OFFSET(sigma), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 1.0, 30.0, FLAGS },
+    { "p",  "patch size",                   OFFSET(patch_size),    AV_OPT_TYPE_INT, { .i64 = 2*3+1 }, 0, 99, FLAGS },
+    { "pc", "patch size for chroma planes", OFFSET(patch_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 },     0, 99, FLAGS },
+    { "r",  "research window",                   OFFSET(research_size),    AV_OPT_TYPE_INT, { .i64 = 7*2+1 }, 0, 99, FLAGS },
+    { "rc", "research window for chroma planes", OFFSET(research_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 },     0, 99, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(nlmeans_opencl);
+
+static const AVFilterPad nlmeans_opencl_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = &nlmeans_opencl_filter_frame,
+        .config_props = &ff_opencl_filter_config_input,
+    },
+    { NULL }
+};
+
+static const AVFilterPad nlmeans_opencl_outputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = &ff_opencl_filter_config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_nlmeans_opencl = {
+    .name           = "nlmeans_opencl",
+    .description    = NULL_IF_CONFIG_SMALL("Non-local means denoiser through OpenCL"),
+    .priv_size      = sizeof(NLMeansOpenCLContext),
+    .priv_class     = &nlmeans_opencl_class,
+    .init           = &ff_opencl_filter_init,
+    .uninit         = &nlmeans_opencl_uninit,
+    .query_formats  = &ff_opencl_filter_query_formats,
+    .inputs         = nlmeans_opencl_inputs,
+    .outputs        = nlmeans_opencl_outputs,
+    .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
+};
-- 
2.17.1



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