[FFmpeg-devel] [PATCH] lavfi: Add OpenCL avgblur filter
Dylan Fernando
dylanf123 at gmail.com
Wed Mar 21 15:09:37 EET 2018
On Tue, Mar 20, 2018 at 10:34 AM, Mark Thompson <sw at jkqxz.net> wrote:
> On 19/03/18 02:30, dylanf123 at gmail.com wrote:
> > From: drfer3 <drfer3 at student.monash.edu>
> >
> > Behaves like the existing avgblur filter, except working on OpenCL
> > hardware frames. Takes exactly the same options.
> > ---
> > configure | 1 +
> > libavfilter/Makefile | 2 +
> > libavfilter/allfilters.c | 1 +
> > libavfilter/opencl/avgblur.cl | 60 ++++++++
> > libavfilter/opencl_source.h | 1 +
> > libavfilter/vf_avgblur_opencl.c | 328 ++++++++++++++++++++++++++++++
> ++++++++++
> > 6 files changed, 393 insertions(+)
> > create mode 100644 libavfilter/opencl/avgblur.cl
> > create mode 100644 libavfilter/vf_avgblur_opencl.c
> >
> > diff --git a/configure b/configure
> > index 0c5ed07a07..481d338caf 100755
> > --- a/configure
> > +++ b/configure
> > @@ -3202,6 +3202,7 @@ aresample_filter_deps="swresample"
> > ass_filter_deps="libass"
> > atempo_filter_deps="avcodec"
> > atempo_filter_select="rdft"
> > +avgblur_opencl_filter_deps="opencl"
> > azmq_filter_deps="libzmq"
> > blackframe_filter_deps="gpl"
> > boxblur_filter_deps="gpl"
> > diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> > index fc16512e2c..1043b41d80 100644
> > --- a/libavfilter/Makefile
> > +++ b/libavfilter/Makefile
> > @@ -139,6 +139,8 @@ OBJS-$(CONFIG_ALPHAMERGE_FILTER) +=
> vf_alphamerge.o
> > OBJS-$(CONFIG_ASS_FILTER) += vf_subtitles.o
> > OBJS-$(CONFIG_ATADENOISE_FILTER) += vf_atadenoise.o
> > OBJS-$(CONFIG_AVGBLUR_FILTER) += vf_avgblur.o
> > +OBJS-$(CONFIG_AVGBLUR_OPENCL_FILTER) += vf_avgblur_opencl.o
> opencl.o \
> > + opencl/avgblur.o
> > OBJS-$(CONFIG_BBOX_FILTER) += bbox.o vf_bbox.o
> > OBJS-$(CONFIG_BENCH_FILTER) += f_bench.o
> > OBJS-$(CONFIG_BITPLANENOISE_FILTER) += vf_bitplanenoise.o
> > diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> > index cc423af738..3f67e321bf 100644
> > --- a/libavfilter/allfilters.c
> > +++ b/libavfilter/allfilters.c
> > @@ -149,6 +149,7 @@ static void register_all(void)
> > REGISTER_FILTER(ASS, ass, vf);
> > REGISTER_FILTER(ATADENOISE, atadenoise, vf);
> > REGISTER_FILTER(AVGBLUR, avgblur, vf);
> > + REGISTER_FILTER(AVGBLUR_OPENCL, avgblur_opencl, vf);
> > REGISTER_FILTER(BBOX, bbox, vf);
> > REGISTER_FILTER(BENCH, bench, vf);
> > REGISTER_FILTER(BITPLANENOISE, bitplanenoise, vf);
> > diff --git a/libavfilter/opencl/avgblur.cl b/libavfilter/opencl/avgblur.
> cl
> > new file mode 100644
> > index 0000000000..6a8d70df93
> > --- /dev/null
> > +++ b/libavfilter/opencl/avgblur.cl
> > @@ -0,0 +1,60 @@
> > +/*
> > + * Copyright (c) 2018 Dylan Fernando
> > + *
> > + * 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 avgblur_horiz(__write_only image2d_t dst,
> > + __read_only image2d_t src,
> > + int rad)
> > +{
> > + const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
> > + CLK_FILTER_NEAREST);
> > + int2 loc = (int2)(get_global_id(0), get_global_id(1));
> > + int2 size = (int2)(get_global_size(0), get_global_size(1));
> > +
> > + int count = 0;
> > + float4 acc = (float4)(0,0,0,0);
> > +
> > + for (int xx = max(0, loc.x - rad); xx < min(loc.x + rad + 1,
> size.x); xx++) {
> > + count++;
> > + acc += read_imagef(src, sampler, (int2)(xx, loc.y));
> > + }
> > +
> > + write_imagef(dst, loc, acc / count);
> > +}
> > +
> > +__kernel void avgblur_vert(__write_only image2d_t dst,
> > + __read_only image2d_t src,
> > + int radv)
> > +{
> > + const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
> > + CLK_FILTER_NEAREST);
> > + int2 loc = (int2)(get_global_id(0), get_global_id(1));
> > + int2 size = (int2)(get_global_size(0), get_global_size(1));
> > +
> > + int count = 0;
> > + float4 acc = (float4)(0,0,0,0);
> > +
> > + for (int yy = max(0, loc.y - radv); yy < min(loc.y + radv + 1,
> size.y); yy++) {
> > + count++;
> > + acc += read_imagef(src, sampler, (int2)(loc.x, yy));
> > + }
> > +
> > + write_imagef(dst, loc, acc / count);
> > +}
> > diff --git a/libavfilter/opencl_source.h b/libavfilter/opencl_source.h
> > index 23cdfc6ac9..02bc1723b0 100644
> > --- a/libavfilter/opencl_source.h
> > +++ b/libavfilter/opencl_source.h
> > @@ -19,6 +19,7 @@
> > #ifndef AVFILTER_OPENCL_SOURCE_H
> > #define AVFILTER_OPENCL_SOURCE_H
> >
> > +extern const char *ff_opencl_source_avgblur;
> > extern const char *ff_opencl_source_overlay;
> > extern const char *ff_opencl_source_unsharp;
> >
> > diff --git a/libavfilter/vf_avgblur_opencl.c b/libavfilter/vf_avgblur_
> opencl.c
> > new file mode 100644
> > index 0000000000..a6baa28ac1
> > --- /dev/null
> > +++ b/libavfilter/vf_avgblur_opencl.c
> > @@ -0,0 +1,328 @@
> > +/*
> > + * Copyright (c) 2018 Dylan Fernando
> > + *
> > + * 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/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"
> > +
> > +
> > +typedef struct AverageBlurOpenCLContext {
> > + OpenCLFilterContext ocf;
> > +
> > + int initialised;
> > + cl_kernel kernel_horiz;
> > + cl_kernel kernel_vert;
> > + cl_command_queue command_queue;
> > +
> > + int radius;
> > + int radiusV;
> > + int planes;
> > +
> > +} AverageBlurOpenCLContext;
> > +
> > +
> > +static int avgblur_opencl_init(AVFilterContext *avctx)
> > +{
> > + AverageBlurOpenCLContext *ctx = avctx->priv;
> > + cl_int cle;
> > + int err;
> > +
> > + err = ff_opencl_filter_load_program(avctx,
> &ff_opencl_source_avgblur, 1);
> > + if (err < 0)
> > + goto fail;
> > +
> > + ctx->command_queue = clCreateCommandQueue(ctx->ocf.hwctx->context,
> > + ctx->ocf.hwctx->device_id,
> > + 0, &cle);
> > + if (!ctx->command_queue) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to create OpenCL "
> > + "command queue: %d.\n", cle);
> > + err = AVERROR(EIO);
> > + goto fail;
> > + }
> > +
> > + ctx->kernel_horiz = clCreateKernel(ctx->ocf.program,"avgblur_horiz",
> &cle);
> > + if (!ctx->kernel_horiz) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to create kernel: %d.\n",
> cle);
> > + err = AVERROR(EIO);
> > + goto fail;
> > + }
> > +
> > + ctx->kernel_vert = clCreateKernel(ctx->ocf.program,"avgblur_vert",
> &cle);
> > + if (!ctx->kernel_vert) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to create kernel: %d.\n",
> cle);
> > + err = AVERROR(EIO);
> > + goto fail;
> > + }
> > +
> > + if (ctx->radiusV <= 0) {
> > + ctx->radiusV = ctx->radius;
> > + }
> > +
> > + ctx->initialised = 1;
> > + return 0;
> > +
> > +fail:
> > + if (ctx->command_queue)
> > + clReleaseCommandQueue(ctx->command_queue);
> > + if (ctx->kernel_horiz)
> > + clReleaseKernel(ctx->kernel_horiz);
> > + if (ctx->kernel_vert)
> > + clReleaseKernel(ctx->kernel_vert);
> > + return err;
> > +}
> > +
> > +static int avgblur_opencl_filter_frame(AVFilterLink *inlink, AVFrame
> *input)
> > +{
> > + AVFilterContext *avctx = inlink->dst;
> > + AVFilterLink *outlink = avctx->outputs[0];
> > + AverageBlurOpenCLContext *ctx = avctx->priv;
> > + AVFrame *output = NULL;
> > + AVFrame *intermediate = NULL;
> > + cl_int cle;
> > + size_t global_work[2];
> > + cl_mem src, dst, inter;
> > + int err, p;
> > +
> > + 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);
> > +
> > + if (!ctx->initialised) {
> > + err = avgblur_opencl_init(avctx);
> > + if (err < 0)
> > + goto fail;
> > +
> > + }
> > +
> > + output = ff_get_video_buffer(outlink, outlink->w, outlink->h);
> > + if (!output) {
> > + err = AVERROR(ENOMEM);
> > + goto fail;
> > + }
> > +
> > + intermediate = ff_get_video_buffer(outlink, outlink->w, outlink->h);
> > + if (!intermediate) {
> > + err = AVERROR(ENOMEM);
> > + goto fail;
> > + }
> > +
> > + for (p = 0; p < FF_ARRAY_ELEMS(output->data); p++) {
> > + src = (cl_mem) input->data[p];
> > + dst = (cl_mem)output->data[p];
> > + inter = (cl_mem) intermediate->data[p];
> > +
> > + if (!dst)
> > + break;
> > +
> > + int radius_x = ctx->radius;
> > + int radius_y = ctx->radiusV;
>
> We do still forbid mixed declarations and code, so these should be
> declared at the start of the block or function. (You should get a compiler
> warning for that in at least some cases - I do from gcc 7.)
>
> > +
> > + if (!(ctx->planes & (1 << p))) {
> > + radius_x = 0;
> > + radius_y = 0;
> > + }
> > +
> > + cle = clSetKernelArg(ctx->kernel_horiz, 0, sizeof(cl_mem),
> &inter);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
> > + "destination image argument: %d.\n", cle);
> > + goto fail;
> > + }
> > + cle = clSetKernelArg(ctx->kernel_horiz, 1, sizeof(cl_mem),
> &src);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
> > + "source image argument: %d.\n", cle);
> > + goto fail;
> > + }
> > + cle = clSetKernelArg(ctx->kernel_horiz, 2, sizeof(cl_int),
> &radius_x);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
> > + "sizeX argument: %d.\n", cle);
> > + goto fail;
> > + }
> > +
> > + global_work[0] = output->width;
> > + global_work[1] = output->height;
> > +
> > + av_log(avctx, AV_LOG_DEBUG, "Run kernel on plane %d "
> > + "(%"SIZE_SPECIFIER"x%"SIZE_SPECIFIER").\n",
> > + p, global_work[0], global_work[1]);
> > +
> > + cle = clEnqueueNDRangeKernel(ctx->command_queue,
> ctx->kernel_horiz, 2, NULL,
> > + global_work, NULL,
> > + 0, NULL, NULL);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to enqueue kernel:
> %d.\n",
> > + cle);
> > + err = AVERROR(EIO);
> > + goto fail;
> > + }
> > +
> > + cle = clSetKernelArg(ctx->kernel_vert, 0, sizeof(cl_mem),
> &dst);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
> > + "destination image argument: %d.\n", cle);
> > + goto fail;
> > + }
> > + cle = clSetKernelArg(ctx->kernel_vert, 1, sizeof(cl_mem),
> &inter);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
> > + "source image argument: %d.\n", cle);
> > + goto fail;
> > + }
> > + cle = clSetKernelArg(ctx->kernel_vert, 2, sizeof(cl_int),
> &radius_y);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
> > + "sizeY argument: %d.\n", cle);
> > + goto fail;
> > + }
> > +
> > + global_work[0] = output->width;
> > + global_work[1] = output->height;
> > +
> > + av_log(avctx, AV_LOG_DEBUG, "Run kernel on plane %d "
> > + "(%"SIZE_SPECIFIER"x%"SIZE_SPECIFIER").\n",
> > + p, global_work[0], global_work[1]);
> > +
> > + cle = clEnqueueNDRangeKernel(ctx->command_queue,
> ctx->kernel_vert, 2, NULL,
> > + global_work, NULL,
> > + 0, NULL, NULL);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to enqueue kernel:
> %d.\n",
> > + cle);
> > + err = AVERROR(EIO);
> > + goto fail;
> > + }
> > +
> > + }
> > +
> > + cle = clFinish(ctx->command_queue);
> > + if (cle != CL_SUCCESS) {
> > + av_log(avctx, AV_LOG_ERROR, "Failed to finish command queue:
> %d.\n",
> > + cle);
> > + err = AVERROR(EIO);
> > + goto fail;
> > + }
> > +
> > + err = av_frame_copy_props(output, input);
> > + if (err < 0)
> > + goto fail;
> > +
> > + av_frame_free(&input);
> > + av_frame_free(&intermediate);
> > +
> > + 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);
> > + av_frame_free(&intermediate);
> > + return err;
> > +}
> > +
> > +static av_cold void avgblur_opencl_uninit(AVFilterContext *avctx)
> > +{
> > + AverageBlurOpenCLContext *ctx = avctx->priv;
> > + cl_int cle;
> > +
> > +
> > + if (ctx->kernel_horiz) {
> > + cle = clReleaseKernel(ctx->kernel_horiz);
> > + if (cle != CL_SUCCESS)
> > + av_log(avctx, AV_LOG_ERROR, "Failed to release "
> > + "kernel: %d.\n", cle);
> > + }
> > +
> > + if (ctx->kernel_vert) {
> > + cle = clReleaseKernel(ctx->kernel_vert);
> > + if (cle != CL_SUCCESS)
> > + av_log(avctx, AV_LOG_ERROR, "Failed to release "
> > + "kernel: %d.\n", cle);
> > + }
> > +
> > + 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(AverageBlurOpenCLContext, x)
> > +#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
> > +static const AVOption avgblur_opencl_options[] = {
> > + { "sizeX", "set horizontal size", OFFSET(radius),
> AV_OPT_TYPE_INT, {.i64=1}, 1, 1024, FLAGS },
> > + { "planes", "set planes to filter", OFFSET(planes),
> AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
> > + { "sizeY", "set vertical size", OFFSET(radiusV),
> AV_OPT_TYPE_INT, {.i64=0}, 0, 1024, FLAGS },
> > + { NULL }
> > +};
> > +
> > +AVFILTER_DEFINE_CLASS(avgblur_opencl);
> > +
> > +static const AVFilterPad avgblur_opencl_inputs[] = {
> > + {
> > + .name = "default",
> > + .type = AVMEDIA_TYPE_VIDEO,
> > + .filter_frame = &avgblur_opencl_filter_frame,
> > + .config_props = &ff_opencl_filter_config_input,
> > + },
> > + { NULL }
> > +};
> > +
> > +static const AVFilterPad avgblur_opencl_outputs[] = {
> > + {
> > + .name = "default",
> > + .type = AVMEDIA_TYPE_VIDEO,
> > + .config_props = &ff_opencl_filter_config_output,
> > + },
> > + { NULL }
> > +};
> > +
> > +AVFilter ff_vf_avgblur_opencl = {
> > + .name = "avgblur_opencl",
> > + .description = NULL_IF_CONFIG_SMALL("Apply average blur filter"),
> > + .priv_size = sizeof(AverageBlurOpenCLContext),
> > + .priv_class = &avgblur_opencl_class,
> > + .init = &ff_opencl_filter_init,
> > + .uninit = &avgblur_opencl_uninit,
> > + .query_formats = &ff_opencl_filter_query_formats,
> > + .inputs = avgblur_opencl_inputs,
> > + .outputs = avgblur_opencl_outputs,
> > + .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
> > +};
> >
>
> Ignoring the one trivial issue above which I can easily fix myself, this
> all looks good to me. I'll try to test on some other platforms (non-Intel,
> at least AMD and Mali) tomorrow, but I don't anticipate any issues. Does
> anyone else have any thoughts? I'll push this after tomorrow if there
> isn't anything further.
>
> Thank you!
>
> - Mark
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
Thanks.
What information should I put in my GSoC application? How should I
structure it? Should I give a rough timeline detailing exactly which color
conversion and scaling algorithms I’ll be implementing? If so, which files
should I look at to see the current colour conversion code?
- Dylan
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