afSTFT_internal.h

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/*
 Copyright (c) 2015 Juha Vilkamo
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
 
#ifndef __afSTFTlib_INTERNAL_INCLUDED__
#define __afSTFTlib_INTERNAL_INCLUDED__
 
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
   
#define AFSTFT_USE_SAF_UTILITIES
#ifdef AFSTFT_USE_SAF_UTILITIES
# include "../../modules/saf_utilities/saf_utilities.h"
#include "saf_externals.h" 
#else
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
#endif
 
/* Coefficients for a half-band filter, i.e., the "hybrid filter" applied optionally at the bands 1--4. */
#define COEFF1 0.031273141818515176604f 
#define COEFF2 0.28127313041521179171f  
#define COEFF3 0.5f 
/* ========================================================================== */
/*                            Internal structures                             */
/* ========================================================================== */
 
typedef struct {
    float *re;
    float *im;
} complexVector;
 
typedef struct{
    int inChannels;
    int outChannels;
    int hopSize;
    int hLen;
    int LDmode;
    int hopIndexIn;
    int hopIndexOut;
    int totalHops;
    float *protoFilter;
    float *protoFilterI;
    float **inBuffer;
    float *fftProcessFrameTD;
    float **outBuffer;
#ifdef AFSTFT_USE_SAF_UTILITIES
    void* hSafFFT;
    float_complex *fftProcessFrameFD;
    float* tempHopBuffer;
#else
    int pr;
    int log2n;
    void *vtFFT;
    float *fftProcessFrameFD;
#endif
    void *h_afHybrid;
    int hybridMode;
    
} afSTFTlib_internal_data;
 
typedef struct{
    int inChannels;
    int outChannels;
    int hopSize;
    float hybridCoeffs[3];
    complexVector **analysisBuffer;
    int loopPointer;
} afHybrid;
 
 
/* ========================================================================== */
/*                            Internal functions                              */
/* ========================================================================== */
 
void afSTFTlib_init(void** handle,
                    int hopSize,
                    int inChannels,
                    int outChannels,
                    int LDmode,
                    int hybridMode);
 
void afSTFTlib_channelChange(void* handle,
                             int new_inChannels,
                             int new_outChannels);
 
void afSTFTlib_clearBuffers(void* handle);
 
void afSTFTlib_forward(void* handle,
                       float** inTD,
                       complexVector* outFD);
 
void afSTFTlib_inverse(void* handle,
                       complexVector* inFD,
                       float** outTD);
 
void afSTFTlib_free(void* handle);
 
void afHybridInit(void** handle,
                  int hopSize,
                  int inChannels,
                  int outChannels);
 
void afHybridForward(void* handle,
                     complexVector* FD);
 
void afHybridInverse(void* handle,
                     complexVector* FD);
 
void afHybridFree(void* handle);
 
 
#ifdef __cplusplus
}/* extern "C" */
#endif /* __cplusplus */
 
#endif /* __afSTFTlib_INTERNAL_INCLUDED__ */