text: /*
   * Copyright (c) 2018 Dylan Fernando
   * 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
   */
  
  #include "libavutil/common.h"
  #include "libavutil/imgutils.h"
  #include "libavutil/opt.h"
  
  #include "avfilter.h"
  #include "internal.h"
  #include "opencl.h"
  #include "opencl_source.h"
  #include "video.h"
  #include "boxblur.h"
  
  typedef struct AverageBlurOpenCLContext {
      OpenCLFilterContext ocf;
  
      int              initialised;
      cl_kernel        kernel_horiz;
      cl_kernel        kernel_vert;
      cl_command_queue command_queue;
  
      int radiusH;
      int radiusV;
      int planes;
  
      FilterParam luma_param;
      FilterParam chroma_param;
      FilterParam alpha_param;
      int radius[4];
      int power[4];
  
  } 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;
      }
  
      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_make_filter_params(AVFilterLink *inlink)
  {
      AVFilterContext    *ctx = inlink->dst;
      AverageBlurOpenCLContext *s = ctx->priv;
      int i;
  
      if (s->radiusV <= 0) {
          s->radiusV = s->radiusH;
      }
  
      for (i = 0; i < 4; i++) {
          s->power[i] = 1;
      }
      return 0;
  }
  
  
  static int boxblur_opencl_make_filter_params(AVFilterLink *inlink)
  {
      AVFilterContext    *ctx = inlink->dst;
      AverageBlurOpenCLContext *s = ctx->priv;
      int err, i;
  
      err = ff_boxblur_eval_filter_params(inlink,
                                          &s->luma_param,
                                          &s->chroma_param,
                                          &s->alpha_param);
  
      if (err != 0) {
          av_log(ctx, AV_LOG_ERROR, "Failed to evaluate "
                 "filter params: %d.\n", err);
          return err;
      }
  
      s->radius[Y] = s->luma_param.radius;
      s->radius[U] = s->radius[V] = s->chroma_param.radius;
      s->radius[A] = s->alpha_param.radius;
  
      s->power[Y] = s->luma_param.power;
      s->power[U] = s->power[V] = s->chroma_param.power;
      s->power[A] = s->alpha_param.power;
  
      for (i = 0; i < 4; i++) {
          if (s->power[i] == 0) {
              s->power[i] = 1;
              s->radius[i] = 0;
          }
      }
  
      return 0;
  }
  
  
  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, radius_x, radius_y, i;
  
      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;
  
          if (!strcmp(avctx->filter->name, "avgblur_opencl")) {
              err = avgblur_opencl_make_filter_params(inlink);
              if (err < 0)
                  goto fail;
          } else if (!strcmp(avctx->filter->name, "boxblur_opencl")) {
              err = boxblur_opencl_make_filter_params(inlink);
              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;
  
          radius_x = ctx->radiusH;
          radius_y = ctx->radiusV;
  
          if (!(ctx->planes & (1 << p))) {
              radius_x = 0;
              radius_y = 0;
          }
  
          av_log(avctx, AV_LOG_DEBUG, "Run kernel on plane %d "
                 "(%"SIZE_SPECIFIER"x%"SIZE_SPECIFIER").\n",
                 p, global_work[0], global_work[1]);
  
          for (i = 0; i < ctx->power[p]; i++) {
              CL_SET_KERNEL_ARG(ctx->kernel_horiz, 0, cl_mem, &inter);
              CL_SET_KERNEL_ARG(ctx->kernel_horiz, 1, cl_mem, i == 0 ? &src : &dst);
              if (!strcmp(avctx->filter->name, "avgblur_opencl")) {
                  CL_SET_KERNEL_ARG(ctx->kernel_horiz, 2, cl_int, &radius_x);
              } else if (!strcmp(avctx->filter->name, "boxblur_opencl")) {
                  CL_SET_KERNEL_ARG(ctx->kernel_horiz, 2, cl_int, &ctx->radius[p]);
              }
  
              err = ff_opencl_filter_work_size_from_image(avctx, global_work,
                                                          i == 0 ? intermediate : output, p, 0);
              if (err < 0)
                  goto fail;
  
              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 = clFinish(ctx->command_queue);
  
              err = ff_opencl_filter_work_size_from_image(avctx, global_work,
                                                          i == 0 ? output : intermediate, p, 0);
  
              CL_SET_KERNEL_ARG(ctx->kernel_vert, 0, cl_mem, &dst);
              CL_SET_KERNEL_ARG(ctx->kernel_vert, 1, cl_mem, &inter);
  
              if (!strcmp(avctx->filter->name, "avgblur_opencl")) {
                  CL_SET_KERNEL_ARG(ctx->kernel_vert, 2, cl_int, &radius_y);
              } else if (!strcmp(avctx->filter->name, "boxblur_opencl")) {
                  CL_SET_KERNEL_ARG(ctx->kernel_vert, 2, cl_int, &ctx->radius[p]);
              }
  
              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);
  }
  
  
  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 }
  };
  
  
  #define OFFSET(x) offsetof(AverageBlurOpenCLContext, x)
  #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
  
  #if CONFIG_AVGBLUR_OPENCL_FILTER
  
  static const AVOption avgblur_opencl_options[] = {
      { "sizeX",  "set horizontal size",  OFFSET(radiusH), 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);
  
  
  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,
  };
  
  #endif /* CONFIG_AVGBLUR_OPENCL_FILTER */
  
  
  #if CONFIG_BOXBLUR_OPENCL_FILTER
  
  static const AVOption boxblur_opencl_options[] = {
      { "luma_radius", "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
      { "lr",          "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
      { "luma_power",  "How many times should the boxblur be applied to luma",  OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },
      { "lp",          "How many times should the boxblur be applied to luma",  OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },
  
      { "chroma_radius", "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
      { "cr",            "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
      { "chroma_power",  "How many times should the boxblur be applied to chroma",  OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
      { "cp",            "How many times should the boxblur be applied to chroma",  OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
  
      { "alpha_radius", "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
      { "ar",           "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
      { "alpha_power",  "How many times should the boxblur be applied to alpha",  OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
      { "ap",           "How many times should the boxblur be applied to alpha",  OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
  
      { NULL }
  };
  
  AVFILTER_DEFINE_CLASS(boxblur_opencl);
  
  AVFilter ff_vf_boxblur_opencl = {
      .name           = "boxblur_opencl",
      .description    = NULL_IF_CONFIG_SMALL("Apply boxblur filter to input video"),
      .priv_size      = sizeof(AverageBlurOpenCLContext),
      .priv_class     = &boxblur_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,
  };
  
  #endif /* CONFIG_BOXBLUR_OPENCL_FILTER */
  