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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_mfcc_f32.c
* Description: MFCC function for the f32 version
*
* $Date: 07 September 2021
* $Revision: V1.10.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 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_compiler_specific.h"
#include "dsp/transform_functions.h"
#include "dsp/statistics_functions.h"
#include "dsp/basic_math_functions.h"
#include "dsp/complex_math_functions.h"
#include "dsp/fast_math_functions.h"
#include "dsp/matrix_functions.h"
/**
@ingroup MFCC
*/
/**
@addtogroup MFCCF32
@{
*/
/**
@brief MFCC F32
@param[in] S points to the mfcc instance structure
@param[in] pSrc points to the input samples
@param[out] pDst points to the output MFCC values
@param[inout] pTmp points to a temporary buffer of complex
@par Description
The number of input samples if the FFT length used
when initializing the instance data structure.
The source buffer is modified by this function.
@par Neon implementation
The Neon implementation has a different API.
There is an additional temporary buffer pTmp2.
The source buffer is modified.
@code
void arm_mfcc_f32(
const arm_mfcc_instance_f32 * S,
float32_t *pSrc,
float32_t *pDst,
float32_t *pTmp,
float32_t *pTmp2
);
@endcode
@par Size of buffers according to the target architecture and datatype:
They are described on the page \ref transformbuffers "transform buffers".
*/
#if defined(ARM_MATH_NEON)
ARM_DSP_ATTRIBUTE void arm_mfcc_f32(
const arm_mfcc_instance_f32 * S,
float32_t *pSrc,
float32_t *pDst,
float32_t *pTmp,
float32_t *pTmp2
)
#else
ARM_DSP_ATTRIBUTE void arm_mfcc_f32(
const arm_mfcc_instance_f32 * S,
float32_t *pSrc,
float32_t *pDst,
float32_t *pTmp
)
#endif
{
float32_t maxValue;
uint32_t index;
uint32_t i;
float32_t result;
const float32_t *coefs=S->filterCoefs;
arm_matrix_instance_f32 pDctMat;
/* Normalize */
arm_absmax_f32(pSrc,S->fftLen,&maxValue,&index);
if (maxValue != 0.0f)
{
arm_scale_f32(pSrc,1.0f/maxValue,pSrc,S->fftLen);
}
/* Multiply by window */
arm_mult_f32(pSrc,S->windowCoefs,pSrc,S->fftLen);
/* Compute spectrum magnitude
*/
#if defined(ARM_MATH_NEON)
arm_rfft_fast_f32(&(S->rfft),pSrc,pTmp,pTmp2,0);
pTmp[1]=0.0f;
#else
#if defined(ARM_MFCC_USE_CFFT)
/* some HW accelerator for CMSIS-DSP used in some boards
are only providing acceleration for CFFT.
With ARM_MFCC_USE_CFFT enabled, CFFT is used and the MFCC
will be accelerated on those boards.
The default is to use RFFT
*/
/* Convert from real to complex */
for(i=0; i < S->fftLen ; i++)
{
pTmp[2*i] = pSrc[i];
pTmp[2*i+1] = 0.0f;
}
arm_cfft_f32(&(S->cfft),pTmp,0,1);
#else
/* Default RFFT based implementation */
arm_rfft_fast_f32(&(S->rfft),pSrc,pTmp,0);
pTmp[1]=0.0f;
#endif /* ARM_MFCC_USE_CFFT */
#endif /* ARM_MATH_NEON */
arm_cmplx_mag_f32(pTmp,pSrc,S->fftLen);
if (maxValue != 0.0f)
{
arm_scale_f32(pSrc,maxValue,pSrc,S->fftLen);
}
/* Apply MEL filters */
for(i=0; i<S->nbMelFilters; i++)
{
arm_dot_prod_f32(pSrc+S->filterPos[i],
coefs,
S->filterLengths[i],
&result);
coefs += S->filterLengths[i];
pTmp[i] = result;
}
/* Compute the log */
arm_offset_f32(pTmp,1.0e-6f,pTmp,S->nbMelFilters);
arm_vlog_f32(pTmp,pTmp,S->nbMelFilters);
/* Multiply with the DCT matrix */
pDctMat.numRows=S->nbDctOutputs;
pDctMat.numCols=S->nbMelFilters;
pDctMat.pData=(float32_t*)S->dctCoefs;
arm_mat_vec_mult_f32(&pDctMat, pTmp, pDst);
}
/**
@} end of MFCCF32 group
*/
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