/*
  * 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/avstring.h"
 #include "libavutil/log.h"
 #include "libavutil/mem.h"
 #include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 
 #include "avfilter.h"
 #include "framesync.h"
 #include "internal.h"
 #include "opencl.h"
 #include "video.h"
 
 typedef struct ProgramOpenCLContext {
     OpenCLFilterContext ocf;
 
     int                 loaded;
     cl_uint             index;
     cl_kernel           kernel;
     cl_command_queue    command_queue;
 
     FFFrameSync         fs;
     AVFrame           **frames;
 
     const char         *source_file;
     const char         *kernel_name;
     int                 nb_inputs;
     int                 width, height;
     enum AVPixelFormat  source_format;
     AVRational          source_rate;
 } ProgramOpenCLContext;
 
 static int program_opencl_load(AVFilterContext *avctx)
 {
     ProgramOpenCLContext *ctx = avctx->priv;
     cl_int cle;
     int err;
 
     err = ff_opencl_filter_load_program_from_file(avctx, ctx->source_file);
     if (err < 0)
         return err;
 
     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);
         return AVERROR(EIO);
     }
 
     ctx->kernel = clCreateKernel(ctx->ocf.program, ctx->kernel_name, &cle);
     if (!ctx->kernel) {
         if (cle == CL_INVALID_KERNEL_NAME) {
             av_log(avctx, AV_LOG_ERROR, "Kernel function '%s' not found in "
                    "program.\n", ctx->kernel_name);
         } else {
             av_log(avctx, AV_LOG_ERROR, "Failed to create kernel: %d.\n", cle);
         }
         return AVERROR(EIO);
     }
 
     ctx->loaded = 1;
     return 0;
 }
 
 static int program_opencl_run(AVFilterContext *avctx)
 {
     AVFilterLink     *outlink = avctx->outputs[0];
     ProgramOpenCLContext *ctx = avctx->priv;
     AVFrame *output = NULL;
     cl_int cle;
     size_t global_work[2];
     cl_mem src, dst;
     int err, input, plane;
 
     if (!ctx->loaded) {
         err = program_opencl_load(avctx);
         if (err < 0)
             return err;
     }
 
     output = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!output) {
         err = AVERROR(ENOMEM);
         goto fail;
     }
 
     for (plane = 0; plane < FF_ARRAY_ELEMS(output->data); plane++) {
         dst = (cl_mem)output->data[plane];
         if (!dst)
             break;
 
         cle = clSetKernelArg(ctx->kernel, 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);

             err = AVERROR_UNKNOWN;

             goto fail;
         }
         cle = clSetKernelArg(ctx->kernel, 1, sizeof(cl_uint), &ctx->index);
         if (cle != CL_SUCCESS) {
             av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
                    "index argument: %d.\n", cle);

             err = AVERROR_UNKNOWN;

             goto fail;
         }
 
         for (input = 0; input < ctx->nb_inputs; input++) {
             av_assert0(ctx->frames[input]);
 
             src = (cl_mem)ctx->frames[input]->data[plane];
             av_assert0(src);
 
             cle = clSetKernelArg(ctx->kernel, 2 + input, sizeof(cl_mem), &src);
             if (cle != CL_SUCCESS) {
                 av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
                        "source image argument %d: %d.\n", input, cle);

                 err = AVERROR_UNKNOWN;

                 goto fail;
             }
         }
 

         err = ff_opencl_filter_work_size_from_image(avctx, global_work,
                                                     output, plane, 0);
         if (err < 0)
             goto fail;

 
         av_log(avctx, AV_LOG_DEBUG, "Run kernel on plane %d "
                "(%zux%zu).\n", plane, global_work[0], global_work[1]);
 
         cle = clEnqueueNDRangeKernel(ctx->command_queue, ctx->kernel, 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;
     }
 
     if (ctx->nb_inputs > 0) {
         err = av_frame_copy_props(output, ctx->frames[0]);
         if (err < 0)
             goto fail;
     } else {
         output->pts = ctx->index;
     }
     ++ctx->index;
 
     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(&output);
     return err;
 }
 
 static int program_opencl_request_frame(AVFilterLink *outlink)
 {
     AVFilterContext *avctx = outlink->src;
 
     return program_opencl_run(avctx);
 }
 
 static int program_opencl_filter(FFFrameSync *fs)
 {
     AVFilterContext    *avctx = fs->parent;
     ProgramOpenCLContext *ctx = avctx->priv;
     int err, i;
 
     for (i = 0; i < ctx->nb_inputs; i++) {
         err = ff_framesync_get_frame(&ctx->fs, i, &ctx->frames[i], 0);
         if (err < 0)
             return err;
     }
 
     return program_opencl_run(avctx);
 }
 
 static int program_opencl_activate(AVFilterContext *avctx)
 {
     ProgramOpenCLContext *ctx = avctx->priv;
 
     av_assert0(ctx->nb_inputs > 0);
 
     return ff_framesync_activate(&ctx->fs);
 }
 
 static int program_opencl_config_output(AVFilterLink *outlink)
 {
     AVFilterContext    *avctx = outlink->src;
     ProgramOpenCLContext *ctx = avctx->priv;
     int err;
 
     err = ff_opencl_filter_config_output(outlink);
     if (err < 0)
         return err;
 
     if (ctx->nb_inputs > 0) {
         FFFrameSyncIn *in;
         int i;
 
         err = ff_framesync_init(&ctx->fs, avctx, ctx->nb_inputs);
         if (err < 0)
             return err;
 
         ctx->fs.opaque = ctx;
         ctx->fs.on_event = &program_opencl_filter;
 
         in = ctx->fs.in;
         for (i = 0; i < ctx->nb_inputs; i++) {
             const AVFilterLink *inlink = avctx->inputs[i];
 
             in[i].time_base = inlink->time_base;
             in[i].sync      = 1;
             in[i].before    = EXT_STOP;
             in[i].after     = EXT_INFINITY;
         }
 
         err = ff_framesync_configure(&ctx->fs);
         if (err < 0)
             return err;
 
     } else {
         outlink->time_base = av_inv_q(ctx->source_rate);
     }
 
     return 0;
 }
 
 static av_cold int program_opencl_init(AVFilterContext *avctx)
 {
     ProgramOpenCLContext *ctx = avctx->priv;
     int err;
 
     ff_opencl_filter_init(avctx);
 
     ctx->ocf.output_width  = ctx->width;
     ctx->ocf.output_height = ctx->height;
 
     if (!strcmp(avctx->filter->name, "openclsrc")) {
         if (!ctx->ocf.output_width || !ctx->ocf.output_height) {
             av_log(avctx, AV_LOG_ERROR, "OpenCL source requires output "
                    "dimensions to be specified.\n");
             return AVERROR(EINVAL);
         }
 
         ctx->nb_inputs = 0;
         ctx->ocf.output_format = ctx->source_format;
     } else {
         int i;
 
         ctx->frames = av_mallocz_array(ctx->nb_inputs,
                                        sizeof(*ctx->frames));
         if (!ctx->frames)
             return AVERROR(ENOMEM);
 
         for (i = 0; i < ctx->nb_inputs; i++) {
             AVFilterPad input;
             memset(&input, 0, sizeof(input));
 
             input.type = AVMEDIA_TYPE_VIDEO;
             input.name = av_asprintf("input%d", i);
             if (!input.name)
                 return AVERROR(ENOMEM);
 
             input.config_props = &ff_opencl_filter_config_input;
 
             err = ff_insert_inpad(avctx, i, &input);
             if (err < 0) {
                 av_freep(&input.name);
                 return err;
             }
         }
     }
 
     return 0;
 }
 
 static av_cold void program_opencl_uninit(AVFilterContext *avctx)
 {
     ProgramOpenCLContext *ctx = avctx->priv;
     cl_int cle;
     int i;
 
     if (ctx->nb_inputs > 0) {
         ff_framesync_uninit(&ctx->fs);
 
         av_freep(&ctx->frames);
         for (i = 0; i < avctx->nb_inputs; i++)
             av_freep(&avctx->input_pads[i].name);
     }
 
     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(ProgramOpenCLContext, x)
 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
 
 #if CONFIG_PROGRAM_OPENCL_FILTER
 
 static const AVOption program_opencl_options[] = {
     { "source", "OpenCL program source file", OFFSET(source_file),
       AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
     { "kernel", "Kernel name in program",     OFFSET(kernel_name),
       AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
 
     { "inputs", "Number of inputs", OFFSET(nb_inputs),
       AV_OPT_TYPE_INT,              { .i64 = 1 }, 1, INT_MAX, FLAGS },
 
     { "size",   "Video size",       OFFSET(width),
       AV_OPT_TYPE_IMAGE_SIZE,       { .str = NULL }, 0, 0, FLAGS },
     { "s",      "Video size",       OFFSET(width),
       AV_OPT_TYPE_IMAGE_SIZE,       { .str = NULL }, 0, 0, FLAGS },
 
     { NULL },
 };
 
 FRAMESYNC_DEFINE_CLASS(program_opencl, ProgramOpenCLContext, fs);
 
 static const AVFilterPad program_opencl_outputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = &program_opencl_config_output,
     },
     { NULL }
 };
 
 AVFilter ff_vf_program_opencl = {
     .name           = "program_opencl",
     .description    = NULL_IF_CONFIG_SMALL("Filter video using an OpenCL program"),
     .priv_size      = sizeof(ProgramOpenCLContext),
     .priv_class     = &program_opencl_class,
     .preinit        = &program_opencl_framesync_preinit,
     .init           = &program_opencl_init,
     .uninit         = &program_opencl_uninit,
     .query_formats  = &ff_opencl_filter_query_formats,
     .activate       = &program_opencl_activate,
     .inputs         = NULL,
     .outputs        = program_opencl_outputs,
     .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
 };
 
 #endif
 
 #if CONFIG_OPENCLSRC_FILTER
 
 static const AVOption openclsrc_options[] = {
     { "source", "OpenCL program source file", OFFSET(source_file),
       AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
     { "kernel", "Kernel name in program",     OFFSET(kernel_name),
       AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
 
     { "size",   "Video size",       OFFSET(width),
       AV_OPT_TYPE_IMAGE_SIZE,       { .str = NULL }, 0, 0, FLAGS },
     { "s",      "Video size",       OFFSET(width),
       AV_OPT_TYPE_IMAGE_SIZE,       { .str = NULL }, 0, 0, FLAGS },
 
     { "format", "Video format",     OFFSET(source_format),
       AV_OPT_TYPE_PIXEL_FMT,        { .i64 = AV_PIX_FMT_NONE }, -1, INT_MAX, FLAGS },
 
     { "rate",   "Video frame rate", OFFSET(source_rate),
       AV_OPT_TYPE_VIDEO_RATE,       { .str = "25" }, 0, INT_MAX, FLAGS },
     { "r",      "Video frame rate", OFFSET(source_rate),
       AV_OPT_TYPE_VIDEO_RATE,       { .str = "25" }, 0, INT_MAX, FLAGS },
 
     { NULL },
 };
 
 AVFILTER_DEFINE_CLASS(openclsrc);
 
 static const AVFilterPad openclsrc_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .config_props  = &program_opencl_config_output,
         .request_frame = &program_opencl_request_frame,
     },
     { NULL }
 };
 
 AVFilter ff_vsrc_openclsrc = {
     .name           = "openclsrc",
     .description    = NULL_IF_CONFIG_SMALL("Generate video using an OpenCL program"),
     .priv_size      = sizeof(ProgramOpenCLContext),
     .priv_class     = &openclsrc_class,
     .init           = &program_opencl_init,
     .uninit         = &program_opencl_uninit,
     .query_formats  = &ff_opencl_filter_query_formats,
     .inputs         = NULL,
     .outputs        = openclsrc_outputs,
     .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
 };
 
 #endif