text: /*
   * Copyright (c) 2019 Guo Yejun
   *
   * 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
   */
  
  /**
   * @file
   * DNN native backend implementation.
   */
  
  #include "dnn_backend_native.h"
  #include "libavutil/avassert.h"
  #include "dnn_backend_native_layer_maximum.h"
  
  int dnn_load_layer_maximum(Layer *layer, AVIOContext *model_file_context, int file_size, int operands_num)
  {
      DnnLayerMaximumParams *params;
      int dnn_size = 0;
      params = av_malloc(sizeof(*params));
      if (!params)
          return 0;
  
      params->val.u32 = avio_rl32(model_file_context);
      dnn_size += 4;
      layer->params = params;
      layer->input_operand_indexes[0] = (int32_t)avio_rl32(model_file_context);
      layer->output_operand_index = (int32_t)avio_rl32(model_file_context);
      dnn_size += 8;
  
      if (layer->input_operand_indexes[0] >= operands_num || layer->output_operand_index >= operands_num) {
          return 0;
      }
  
      return dnn_size;
  }
  
  int dnn_execute_layer_maximum(DnnOperand *operands, const int32_t *input_operand_indexes,
                                int32_t output_operand_index, const void *parameters)
  {
      const DnnOperand *input = &operands[input_operand_indexes[0]];
      DnnOperand *output = &operands[output_operand_index];
      const DnnLayerMaximumParams *params = (const DnnLayerMaximumParams *)parameters;
      int dims_count;
      const float *src;
      float *dst;
  
      for (int i = 0; i < 4; ++i)
          output->dims[i] = input->dims[i];
  
      output->data_type = input->data_type;
      output->length = calculate_operand_data_length(output);
      if (output->length <= 0)
          return DNN_ERROR;
      output->data = av_realloc(output->data, output->length);
      if (!output->data)
          return DNN_ERROR;
  
      dims_count = calculate_operand_dims_count(output);
      src = input->data;
      dst = output->data;
      for (int i = 0; i < dims_count; ++i)
          dst[i] = FFMAX(src[i], params->val.y);
  
      return 0;
  }
  