text: #include "edge-impulse-sdk/dsp/config.hpp"
  #if EIDSP_LOAD_CMSIS_DSP_SOURCES
  /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_dct4_init_f32.c
   * Description:  Initialization function of DCT-4 & IDCT4 F32
   *
   * $Date:        18. March 2019
   * $Revision:    V1.6.0
   *
   * Target Processor: Cortex-M cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * 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
   *
   * 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.
   */
  
  #include "edge-impulse-sdk/CMSIS/DSP/Include/arm_math.h"
  #include "edge-impulse-sdk/CMSIS/DSP/Include/arm_common_tables.h"
  
  /**
    @ingroup groupTransforms
   */
  
   /**
    @addtogroup DCT4_IDCT4
    @{
   */
  
  /**
    @brief         Initialization function for the floating-point DCT4/IDCT4.
    @param[in,out] S          points to an instance of floating-point DCT4/IDCT4 structure
    @param[in]     S_RFFT     points to an instance of floating-point RFFT/RIFFT structure
    @param[in]     S_CFFT     points to an instance of floating-point CFFT/CIFFT structure
    @param[in]     N			length of the DCT4
    @param[in]     Nby2       half of the length of the DCT4
    @param[in]     normalize  normalizing factor.
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : <code>N</code> is not a supported transform length
  
    @par           Normalizing factor
                     The normalizing factor is <code>sqrt(2/N)</code>, which depends on the size of transform <code>N</code>.
                     Floating-point normalizing factors are mentioned in the table below for different DCT sizes:
  
                     \image html dct4NormalizingF32Table.gif
   */
  
  arm_status arm_dct4_init_f32(
    arm_dct4_instance_f32 * S,
    arm_rfft_instance_f32 * S_RFFT,
    arm_cfft_radix4_instance_f32 * S_CFFT,
    uint16_t N,
    uint16_t Nby2,
    float32_t normalize)
  {
    /* Initialize the default arm status */
    arm_status status = ARM_MATH_SUCCESS;
  
  
    /* Initialize the DCT4 length */
    S->N = N;
  
    /* Initialize the half of DCT4 length */
    S->Nby2 = Nby2;
  
    /* Initialize the DCT4 Normalizing factor */
    S->normalize = normalize;
  
    /* Initialize Real FFT Instance */
    S->pRfft = S_RFFT;
  
    /* Initialize Complex FFT Instance */
    S->pCfft = S_CFFT;
  
    switch (N)
    {
    #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || defined(ARM_TABLE_DCT4_F32_8192)
      /* Initialize the table modifier values */
    case 8192U:
      S->pTwiddle = Weights_8192;
      S->pCosFactor = cos_factors_8192;
      break;
    #endif
  
    #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || defined(ARM_TABLE_DCT4_F32_2048)
    case 2048U:
      S->pTwiddle = Weights_2048;
      S->pCosFactor = cos_factors_2048;
      break;
    #endif
  
    #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || defined(ARM_TABLE_DCT4_F32_512)
    case 512U:
      S->pTwiddle = Weights_512;
      S->pCosFactor = cos_factors_512;
      break;
    #endif
  
    #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || defined(ARM_TABLE_DCT4_F32_128)
    case 128U:
      S->pTwiddle = Weights_128;
      S->pCosFactor = cos_factors_128;
      break;
    #endif
    default:
      status = ARM_MATH_ARGUMENT_ERROR;
    }
  
    /* Initialize the RFFT/RIFFT Function */
    arm_rfft_init_f32(S->pRfft, S->pCfft, S->N, 0U, 1U);
  
    /* return the status of DCT4 Init function */
    return (status);
  }
  
  /**
    @} end of DCT4_IDCT4 group
   */
  -e 
  #endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
  