text: /**
   * Copyright 2021 Huawei Technologies Co., Ltd
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #ifndef MINDSPORE_CCSRC_MINDDATA_DATASET_AUDIO_KERNELS_SLIDING_WINDOW_CMN_OP_H_
  #define MINDSPORE_CCSRC_MINDDATA_DATASET_AUDIO_KERNELS_SLIDING_WINDOW_CMN_OP_H_
  
  #include <memory>
  #include <string>
  
  #include "minddata/dataset/audio/kernels/audio_utils.h"
  #include "minddata/dataset/core/tensor.h"
  #include "minddata/dataset/kernels/tensor_op.h"
  
  namespace mindspore {
  namespace dataset {
  class SlidingWindowCmnOp : public TensorOp {
   public:
    /// \brief Constructor of SlidingWindowCmnOp.
    /// \param[in] cmn_window - The window in frames for running average CMN computation.
    /// \param[in] min_cmn_window - The minimum CMN window. Only applicable if center is false, ignored if center==true.
    /// \param[in] center - If true, use a window centered on the current frame. If false, window is to the left.
    /// \param[in] norm_vars - If true, normalize variance to one.
    SlidingWindowCmnOp(int32_t cmn_window, int32_t min_cmn_window, bool center, bool norm_vars)
        : cmn_window_(cmn_window), min_cmn_window_(min_cmn_window), center_(center), norm_vars_(norm_vars) {}
  
    /// \brief Destructor of SlidingWindowCmnOp.
    ~SlidingWindowCmnOp() override = default;
  
    /// \brief Perform sliding window CMN to tensor.
    /// \param[in] input - Input tensor of Op.
    /// \param[out] output - Output tensor of Op.
    /// \return Status code.
    Status Compute(const std::shared_ptr<Tensor> &input, std::shared_ptr<Tensor> *output) override;
  
    /// \brief Print name of op.
    std::string Name() const override { return kSlidingWindowCmnOp; }
  
   private:
    int32_t cmn_window_;      // The window in frames for running average CMN computation.
    int32_t min_cmn_window_;  // The minimum CMN window. Only applicable if center == false, ignored if center==true.
    bool center_;             // If true, use a window centered on the current frame. If false, window is to the left.
    bool norm_vars_;          // If true, normalize variance to one.
  };
  }  // namespace dataset
  }  // namespace mindspore
  #endif  // MINDSPORE_CCSRC_MINDDATA_DATASET_AUDIO_KERNELS_SLIDING_WINDOW_CMN_OP_H_
  