1 files changed, 131 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_dct4_init_f32.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_dct4_init_f32.c
new file mode 100644
index 0000000..7522454
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+++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_dct4_init_f32.c
@@ -0,0 +1,131 @@
+/* ----------------------------------------------------------------------
+ * 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 "arm_math.h"
+#include "arm_common_tables.h"
+
+/**
+  @ingroup DCT4_IDCT4
+ */
+
+
+/**
+  @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
+ */