/*
  * 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"
 #include "colorspace.h"
 
 // TODO:

 // - separate peak-detection from tone-mapping kernel to solve

 //    one-frame-delay issue.
 // - more format support
 
 #define DETECTION_FRAMES 63
 
 enum TonemapAlgorithm {
     TONEMAP_NONE,
     TONEMAP_LINEAR,
     TONEMAP_GAMMA,
     TONEMAP_CLIP,
     TONEMAP_REINHARD,
     TONEMAP_HABLE,
     TONEMAP_MOBIUS,
     TONEMAP_MAX,
 };
 
 typedef struct TonemapOpenCLContext {
     OpenCLFilterContext ocf;
 
     enum AVColorSpace colorspace, colorspace_in, colorspace_out;
     enum AVColorTransferCharacteristic trc, trc_in, trc_out;
     enum AVColorPrimaries primaries, primaries_in, primaries_out;
     enum AVColorRange range, range_in, range_out;
     enum AVChromaLocation chroma_loc;
 
     enum TonemapAlgorithm tonemap;
     enum AVPixelFormat    format;
     double                peak;
     double                param;
     double                desat_param;
     double                target_peak;
     double                scene_threshold;
     int                   initialised;
     cl_kernel             kernel;
     cl_command_queue      command_queue;
     cl_mem                util_mem;
 } TonemapOpenCLContext;
 

 static const char *linearize_funcs[AVCOL_TRC_NB] = {

     [AVCOL_TRC_SMPTE2084] = "eotf_st2084",
     [AVCOL_TRC_ARIB_STD_B67] = "inverse_oetf_hlg",
 };
 

 static const char *delinearize_funcs[AVCOL_TRC_NB] = {

     [AVCOL_TRC_BT709]     = "inverse_eotf_bt1886",
     [AVCOL_TRC_BT2020_10] = "inverse_eotf_bt1886",
 };
 

 static const struct PrimaryCoefficients primaries_table[AVCOL_PRI_NB] = {

     [AVCOL_PRI_BT709]  = { 0.640, 0.330, 0.300, 0.600, 0.150, 0.060 },
     [AVCOL_PRI_BT2020] = { 0.708, 0.292, 0.170, 0.797, 0.131, 0.046 },
 };
 

 static const struct WhitepointCoefficients whitepoint_table[AVCOL_PRI_NB] = {

     [AVCOL_PRI_BT709]  = { 0.3127, 0.3290 },
     [AVCOL_PRI_BT2020] = { 0.3127, 0.3290 },
 };
 

 static const char *tonemap_func[TONEMAP_MAX] = {

     [TONEMAP_NONE]     = "direct",
     [TONEMAP_LINEAR]   = "linear",
     [TONEMAP_GAMMA]    = "gamma",
     [TONEMAP_CLIP]     = "clip",
     [TONEMAP_REINHARD] = "reinhard",
     [TONEMAP_HABLE]    = "hable",
     [TONEMAP_MOBIUS]   = "mobius",
 };
 
 static void get_rgb2rgb_matrix(enum AVColorPrimaries in, enum AVColorPrimaries out,
                                double rgb2rgb[3][3]) {
     double rgb2xyz[3][3], xyz2rgb[3][3];
 

     ff_fill_rgb2xyz_table(&primaries_table[out], &whitepoint_table[out], rgb2xyz);
     ff_matrix_invert_3x3(rgb2xyz, xyz2rgb);
     ff_fill_rgb2xyz_table(&primaries_table[in], &whitepoint_table[in], rgb2xyz);
     ff_matrix_mul_3x3(rgb2rgb, rgb2xyz, xyz2rgb);

 }
 
 #define OPENCL_SOURCE_NB 3
 // Average light level for SDR signals. This is equal to a signal level of 0.5
 // under a typical presentation gamma of about 2.0.
 static const float sdr_avg = 0.25f;
 
 static int tonemap_opencl_init(AVFilterContext *avctx)
 {
     TonemapOpenCLContext *ctx = avctx->priv;
     int rgb2rgb_passthrough = 1;

     double rgb2rgb[3][3], rgb2yuv[3][3], yuv2rgb[3][3];
     const struct LumaCoefficients *luma_src, *luma_dst;

     cl_int cle;
     int err;
     AVBPrint header;
     const char *opencl_sources[OPENCL_SOURCE_NB];
 
     av_bprint_init(&header, 1024, AV_BPRINT_SIZE_AUTOMATIC);
 
     switch(ctx->tonemap) {
     case TONEMAP_GAMMA:
         if (isnan(ctx->param))
             ctx->param = 1.8f;
         break;
     case TONEMAP_REINHARD:
         if (!isnan(ctx->param))
             ctx->param = (1.0f - ctx->param) / ctx->param;
         break;
     case TONEMAP_MOBIUS:
         if (isnan(ctx->param))
             ctx->param = 0.3f;
         break;
     }
 
     if (isnan(ctx->param))
         ctx->param = 1.0f;
 
     // SDR peak is 1.0f
     ctx->target_peak = 1.0f;
     av_log(ctx, AV_LOG_DEBUG, "tone mapping transfer from %s to %s\n",
            av_color_transfer_name(ctx->trc_in),
            av_color_transfer_name(ctx->trc_out));
     av_log(ctx, AV_LOG_DEBUG, "mapping colorspace from %s to %s\n",
            av_color_space_name(ctx->colorspace_in),
            av_color_space_name(ctx->colorspace_out));
     av_log(ctx, AV_LOG_DEBUG, "mapping primaries from %s to %s\n",
            av_color_primaries_name(ctx->primaries_in),
            av_color_primaries_name(ctx->primaries_out));
     av_log(ctx, AV_LOG_DEBUG, "mapping range from %s to %s\n",
            av_color_range_name(ctx->range_in),
            av_color_range_name(ctx->range_out));
     // checking valid value just because of limited implementaion
     // please remove when more functionalities are implemented
     av_assert0(ctx->trc_out == AVCOL_TRC_BT709 ||
                ctx->trc_out == AVCOL_TRC_BT2020_10);
     av_assert0(ctx->trc_in == AVCOL_TRC_SMPTE2084||
                ctx->trc_in == AVCOL_TRC_ARIB_STD_B67);
     av_assert0(ctx->colorspace_in == AVCOL_SPC_BT2020_NCL ||
                ctx->colorspace_in == AVCOL_SPC_BT709);
     av_assert0(ctx->primaries_in == AVCOL_PRI_BT2020 ||
                ctx->primaries_in == AVCOL_PRI_BT709);
 
     av_bprintf(&header, "__constant const float tone_param = %.4ff;\n",
                ctx->param);
     av_bprintf(&header, "__constant const float desat_param = %.4ff;\n",
                ctx->desat_param);
     av_bprintf(&header, "__constant const float target_peak = %.4ff;\n",
                ctx->target_peak);
     av_bprintf(&header, "__constant const float sdr_avg = %.4ff;\n", sdr_avg);
     av_bprintf(&header, "__constant const float scene_threshold = %.4ff;\n",
                ctx->scene_threshold);
     av_bprintf(&header, "#define TONE_FUNC %s\n", tonemap_func[ctx->tonemap]);
     av_bprintf(&header, "#define DETECTION_FRAMES %d\n", DETECTION_FRAMES);
 
     if (ctx->primaries_out != ctx->primaries_in) {
         get_rgb2rgb_matrix(ctx->primaries_in, ctx->primaries_out, rgb2rgb);
         rgb2rgb_passthrough = 0;
     }
     if (ctx->range_in == AVCOL_RANGE_JPEG)
         av_bprintf(&header, "#define FULL_RANGE_IN\n");
 
     if (ctx->range_out == AVCOL_RANGE_JPEG)
         av_bprintf(&header, "#define FULL_RANGE_OUT\n");
 
     av_bprintf(&header, "#define chroma_loc %d\n", (int)ctx->chroma_loc);
 
     if (rgb2rgb_passthrough)
         av_bprintf(&header, "#define RGB2RGB_PASSTHROUGH\n");

     else
         ff_opencl_print_const_matrix_3x3(&header, "rgb2rgb", rgb2rgb);
 
 
     luma_src = ff_get_luma_coefficients(ctx->colorspace_in);
     if (!luma_src) {
         err = AVERROR(EINVAL);
         av_log(avctx, AV_LOG_ERROR, "unsupported input colorspace %d (%s)\n",
                ctx->colorspace_in, av_color_space_name(ctx->colorspace_in));
         goto fail;

     }
 

     luma_dst = ff_get_luma_coefficients(ctx->colorspace_out);
     if (!luma_dst) {
         err = AVERROR(EINVAL);
         av_log(avctx, AV_LOG_ERROR, "unsupported output colorspace %d (%s)\n",
                ctx->colorspace_out, av_color_space_name(ctx->colorspace_out));
         goto fail;
     }
 
     ff_fill_rgb2yuv_table(luma_dst, rgb2yuv);
     ff_opencl_print_const_matrix_3x3(&header, "yuv_matrix", rgb2yuv);
 
     ff_fill_rgb2yuv_table(luma_src, rgb2yuv);
     ff_matrix_invert_3x3(rgb2yuv, yuv2rgb);
     ff_opencl_print_const_matrix_3x3(&header, "rgb_matrix", yuv2rgb);

 
     av_bprintf(&header, "constant float3 luma_src = {%.4ff, %.4ff, %.4ff};\n",

                luma_src->cr, luma_src->cg, luma_src->cb);

     av_bprintf(&header, "constant float3 luma_dst = {%.4ff, %.4ff, %.4ff};\n",

                luma_dst->cr, luma_dst->cg, luma_dst->cb);

 
     av_bprintf(&header, "#define linearize %s\n", linearize_funcs[ctx->trc_in]);
     av_bprintf(&header, "#define delinearize %s\n",
                delinearize_funcs[ctx->trc_out]);
 
     if (ctx->trc_in == AVCOL_TRC_ARIB_STD_B67)
         av_bprintf(&header, "#define ootf_impl ootf_hlg\n");
 
     if (ctx->trc_out == AVCOL_TRC_ARIB_STD_B67)
         av_bprintf(&header, "#define inverse_ootf_impl inverse_ootf_hlg\n");
 
     av_log(avctx, AV_LOG_DEBUG, "Generated OpenCL header:\n%s\n", header.str);
     opencl_sources[0] = header.str;
     opencl_sources[1] = ff_opencl_source_tonemap;
     opencl_sources[2] = ff_opencl_source_colorspace_common;
     err = ff_opencl_filter_load_program(avctx, opencl_sources, OPENCL_SOURCE_NB);
 
     av_bprint_finalize(&header, NULL);
     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->kernel = clCreateKernel(ctx->ocf.program, "tonemap", &cle);

     CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create kernel %d.\n", cle);

 
     ctx->util_mem =
         clCreateBuffer(ctx->ocf.hwctx->context, 0,
                        (2 * DETECTION_FRAMES + 7) * sizeof(unsigned),
                        NULL, &cle);

     CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create util buffer: %d.\n", cle);

 
     ctx->initialised = 1;
     return 0;
 
 fail:

     av_bprint_finalize(&header, NULL);

     if (ctx->util_mem)
         clReleaseMemObject(ctx->util_mem);
     if (ctx->command_queue)
         clReleaseCommandQueue(ctx->command_queue);
     if (ctx->kernel)
         clReleaseKernel(ctx->kernel);
     return err;
 }
 
 static int tonemap_opencl_config_output(AVFilterLink *outlink)
 {
     AVFilterContext *avctx = outlink->src;
     TonemapOpenCLContext *s = avctx->priv;
     int ret;
     if (s->format == AV_PIX_FMT_NONE)
         av_log(avctx, AV_LOG_WARNING, "format not set, use default format NV12\n");
     else {
       if (s->format != AV_PIX_FMT_P010 &&
           s->format != AV_PIX_FMT_NV12) {
         av_log(avctx, AV_LOG_ERROR, "unsupported output format,"
                "only p010/nv12 supported now\n");
         return AVERROR(EINVAL);
       }
     }
 
     s->ocf.output_format = s->format == AV_PIX_FMT_NONE ? AV_PIX_FMT_NV12 : s->format;
     ret = ff_opencl_filter_config_output(outlink);
     if (ret < 0)
         return ret;
 
     return 0;
 }
 
 static int launch_kernel(AVFilterContext *avctx, cl_kernel kernel,
                          AVFrame *output, AVFrame *input, float peak) {
     TonemapOpenCLContext *ctx = avctx->priv;
     int err = AVERROR(ENOSYS);
     size_t global_work[2];
     size_t local_work[2];
     cl_int cle;
 
     CL_SET_KERNEL_ARG(kernel, 0, cl_mem, &output->data[0]);
     CL_SET_KERNEL_ARG(kernel, 1, cl_mem, &input->data[0]);
     CL_SET_KERNEL_ARG(kernel, 2, cl_mem, &output->data[1]);
     CL_SET_KERNEL_ARG(kernel, 3, cl_mem, &input->data[1]);
     CL_SET_KERNEL_ARG(kernel, 4, cl_mem, &ctx->util_mem);
     CL_SET_KERNEL_ARG(kernel, 5, cl_float, &peak);
 
     local_work[0]  = 16;
     local_work[1]  = 16;
     // Note the work size based on uv plane, as we process a 2x2 quad in one workitem
     err = ff_opencl_filter_work_size_from_image(avctx, global_work, output,
                                                 1, 16);
     if (err < 0)
         return err;
 
     cle = clEnqueueNDRangeKernel(ctx->command_queue, kernel, 2, NULL,
                                  global_work, local_work,
                                  0, NULL, NULL);

     CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue kernel: %d.\n", cle);

     return 0;
 fail:
     return err;
 }
 
 static int tonemap_opencl_filter_frame(AVFilterLink *inlink, AVFrame *input)
 {
     AVFilterContext    *avctx = inlink->dst;
     AVFilterLink     *outlink = avctx->outputs[0];
     TonemapOpenCLContext *ctx = avctx->priv;
     AVFrame *output = NULL;
     cl_int cle;
     int err;
     double peak = ctx->peak;
 
     AVHWFramesContext *input_frames_ctx =
         (AVHWFramesContext*)input->hw_frames_ctx->data;
 
     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);
 
     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 (!peak)

         peak = ff_determine_signal_peak(input);

 
     if (ctx->trc != -1)
         output->color_trc = ctx->trc;
     if (ctx->primaries != -1)
         output->color_primaries = ctx->primaries;
     if (ctx->colorspace != -1)
         output->colorspace = ctx->colorspace;
     if (ctx->range != -1)
         output->color_range = ctx->range;
 
     ctx->trc_in = input->color_trc;
     ctx->trc_out = output->color_trc;
     ctx->colorspace_in = input->colorspace;
     ctx->colorspace_out = output->colorspace;
     ctx->primaries_in = input->color_primaries;
     ctx->primaries_out = output->color_primaries;
     ctx->range_in = input->color_range;
     ctx->range_out = output->color_range;
     ctx->chroma_loc = output->chroma_location;
 
     if (!ctx->initialised) {
         if (!(input->color_trc == AVCOL_TRC_SMPTE2084 ||
             input->color_trc == AVCOL_TRC_ARIB_STD_B67)) {
             av_log(ctx, AV_LOG_ERROR, "unsupported transfer function characteristic.\n");
             err = AVERROR(ENOSYS);
             goto fail;
         }
 
         if (input_frames_ctx->sw_format != AV_PIX_FMT_P010) {
             av_log(ctx, AV_LOG_ERROR, "unsupported format in tonemap_opencl.\n");
             err = AVERROR(ENOSYS);
             goto fail;
         }
 
         err = tonemap_opencl_init(avctx);
         if (err < 0)
             goto fail;
     }
 
     switch(input_frames_ctx->sw_format) {
     case AV_PIX_FMT_P010:
         err = launch_kernel(avctx, ctx->kernel, output, input, peak);
         if (err < 0) goto fail;
         break;
     default:
         err = AVERROR(ENOSYS);
         goto fail;
     }
 
     cle = clFinish(ctx->command_queue);

     CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to finish command queue: %d.\n", cle);

 
     av_frame_free(&input);
 

     ff_update_hdr_metadata(output, ctx->target_peak);

 
     av_log(ctx, AV_LOG_DEBUG, "Tone-mapping output: %s, %ux%u (%"PRId64").\n",
            av_get_pix_fmt_name(output->format),
            output->width, output->height, output->pts);
 #ifndef NDEBUG
     {
         uint32_t *ptr, *max_total_p, *avg_total_p, *frame_number_p;
         float peak_detected, avg_detected;
         unsigned map_size = (2 * DETECTION_FRAMES  + 7) * sizeof(unsigned);
         ptr = (void *)clEnqueueMapBuffer(ctx->command_queue, ctx->util_mem,
                                          CL_TRUE, CL_MAP_READ, 0, map_size,
                                          0, NULL, NULL, &cle);
         // For the layout of the util buffer, refer tonemap.cl
         if (ptr) {
             max_total_p = ptr + 2 * (DETECTION_FRAMES + 1) + 1;
             avg_total_p = max_total_p + 1;
             frame_number_p = avg_total_p + 2;
             peak_detected = (float)*max_total_p / (REFERENCE_WHITE * (*frame_number_p));
             avg_detected = (float)*avg_total_p / (REFERENCE_WHITE * (*frame_number_p));
             av_log(ctx, AV_LOG_DEBUG, "peak %f, avg %f will be used for next frame\n",
                    peak_detected, avg_detected);
             clEnqueueUnmapMemObject(ctx->command_queue, ctx->util_mem, ptr, 0,
                                     NULL, NULL);
         }
     }
 #endif
 
     return ff_filter_frame(outlink, output);
 
 fail:
     clFinish(ctx->command_queue);
     av_frame_free(&input);
     av_frame_free(&output);
     return err;
 }
 
 static av_cold void tonemap_opencl_uninit(AVFilterContext *avctx)
 {
     TonemapOpenCLContext *ctx = avctx->priv;
     cl_int cle;
 
     if (ctx->util_mem)
         clReleaseMemObject(ctx->util_mem);
     if (ctx->kernel) {
         cle = clReleaseKernel(ctx->kernel);
         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(TonemapOpenCLContext, x)
 #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
 static const AVOption tonemap_opencl_options[] = {
     { "tonemap",      "tonemap algorithm selection", OFFSET(tonemap), AV_OPT_TYPE_INT, {.i64 = TONEMAP_NONE}, TONEMAP_NONE, TONEMAP_MAX - 1, FLAGS, "tonemap" },
     {     "none",     0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_NONE},              0, 0, FLAGS, "tonemap" },
     {     "linear",   0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_LINEAR},            0, 0, FLAGS, "tonemap" },
     {     "gamma",    0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_GAMMA},             0, 0, FLAGS, "tonemap" },
     {     "clip",     0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_CLIP},              0, 0, FLAGS, "tonemap" },
     {     "reinhard", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_REINHARD},          0, 0, FLAGS, "tonemap" },
     {     "hable",    0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_HABLE},             0, 0, FLAGS, "tonemap" },
     {     "mobius",   0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_MOBIUS},            0, 0, FLAGS, "tonemap" },
     { "transfer", "set transfer characteristic", OFFSET(trc), AV_OPT_TYPE_INT, {.i64 = AVCOL_TRC_BT709}, -1, INT_MAX, FLAGS, "transfer" },
     { "t",        "set transfer characteristic", OFFSET(trc), AV_OPT_TYPE_INT, {.i64 = AVCOL_TRC_BT709}, -1, INT_MAX, FLAGS, "transfer" },
     {     "bt709",            0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_BT709},         0, 0, FLAGS, "transfer" },
     {     "bt2020",           0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_BT2020_10},     0, 0, FLAGS, "transfer" },
     { "matrix", "set colorspace matrix", OFFSET(colorspace), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, FLAGS, "matrix" },
     { "m",      "set colorspace matrix", OFFSET(colorspace), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, FLAGS, "matrix" },
     {     "bt709",            0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_SPC_BT709},         0, 0, FLAGS, "matrix" },
     {     "bt2020",           0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_SPC_BT2020_NCL},    0, 0, FLAGS, "matrix" },
     { "primaries", "set color primaries", OFFSET(primaries), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, FLAGS, "primaries" },
     { "p",         "set color primaries", OFFSET(primaries), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, FLAGS, "primaries" },
     {     "bt709",            0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_PRI_BT709},         0, 0, FLAGS, "primaries" },
     {     "bt2020",           0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_PRI_BT2020},        0, 0, FLAGS, "primaries" },
     { "range",         "set color range", OFFSET(range), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, FLAGS, "range" },
     { "r",             "set color range", OFFSET(range), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, FLAGS, "range" },
     {     "tv",            0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range" },
     {     "pc",            0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range" },
     {     "limited",       0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range" },
     {     "full",          0,       0,                 AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range" },
     { "format",    "output pixel format", OFFSET(format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_NONE}, AV_PIX_FMT_NONE, INT_MAX, FLAGS, "fmt" },
     { "peak",      "signal peak override", OFFSET(peak), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, DBL_MAX, FLAGS },
     { "param",     "tonemap parameter",   OFFSET(param), AV_OPT_TYPE_DOUBLE, {.dbl = NAN}, DBL_MIN, DBL_MAX, FLAGS },
     { "desat",     "desaturation parameter",   OFFSET(desat_param), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0, DBL_MAX, FLAGS },
     { "threshold", "scene detection threshold",   OFFSET(scene_threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 0.2}, 0, DBL_MAX, FLAGS },
     { NULL }
 };
 
 AVFILTER_DEFINE_CLASS(tonemap_opencl);
 
 static const AVFilterPad tonemap_opencl_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = &tonemap_opencl_filter_frame,
         .config_props = &ff_opencl_filter_config_input,
     },
     { NULL }
 };
 
 static const AVFilterPad tonemap_opencl_outputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = &tonemap_opencl_config_output,
     },
     { NULL }
 };
 
 AVFilter ff_vf_tonemap_opencl = {
     .name           = "tonemap_opencl",

     .description    = NULL_IF_CONFIG_SMALL("Perform HDR to SDR conversion with tonemapping."),

     .priv_size      = sizeof(TonemapOpenCLContext),
     .priv_class     = &tonemap_opencl_class,
     .init           = &ff_opencl_filter_init,
     .uninit         = &tonemap_opencl_uninit,
     .query_formats  = &ff_opencl_filter_query_formats,
     .inputs         = tonemap_opencl_inputs,
     .outputs        = tonemap_opencl_outputs,
     .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
 };