diff FIRFilter.cpp @ 0:31d2a7e07786

Moved all to folder "tempogram".

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FIRFilter.cpp	Mon Jul 07 10:08:14 2014 +0100
@@ -0,0 +1,115 @@
+//
+//  FIRFilter.cpp
+//  Tempogram
+//
+//  Created by Carl Bussey on 25/06/2014.
+//  Copyright (c) 2014 Carl Bussey. All rights reserved.
+//
+
+#include "FIRFilter.h"
+#include <cmath>
+#include <vamp-sdk/FFT.h>
+#include <assert.h>
+#include <iostream>
+using namespace std;
+
+using Vamp::FFT;
+
+FIRFilter::FIRFilter(const unsigned int lengthInput, const unsigned int numberOfCoefficients) :
+    _lengthInput(lengthInput),
+    _numberOfCoefficients(numberOfCoefficients),
+    fftInput(NULL),
+    fftCoefficients(NULL),
+    fftReal1(NULL),
+    fftImag1(NULL),
+    fftReal2(NULL),
+    fftImag2(NULL),
+    fftFilteredReal(NULL),
+    fftFilteredImag(NULL),
+    fftOutputReal(NULL),
+    fftOutputImag(NULL)
+{
+    initialise();
+}
+
+FIRFilter::~FIRFilter()
+{
+    cleanup();
+}
+
+void
+FIRFilter::initialise()
+{
+    _lengthFIRFFT = pow(2,(ceil(log2(_lengthInput+_numberOfCoefficients-1))));
+    
+    fftInput = new double[_lengthFIRFFT];
+    fftCoefficients = new double[_lengthFIRFFT];
+    fftReal1 = new double[_lengthFIRFFT];
+    fftImag1 = new double[_lengthFIRFFT];
+    fftReal2 = new double[_lengthFIRFFT];
+    fftImag2 = new double[_lengthFIRFFT];
+    fftFilteredReal = new double[_lengthFIRFFT];
+    fftFilteredImag = new double[_lengthFIRFFT];
+    fftOutputReal = new double[_lengthFIRFFT];
+    fftOutputImag = new double[_lengthFIRFFT];
+    
+    for(int i = 0; i < _lengthFIRFFT; i++){
+        fftInput[i] = fftCoefficients[i] = fftReal1[i] = fftImag1[i] = fftReal2[i] = fftImag2[i] = fftFilteredReal[i] = fftFilteredImag[i] = fftOutputReal[i] = fftOutputImag[i] = 0.0;
+    }
+}
+
+void
+FIRFilter::process(const float* input, const float* coefficients, float* output)
+{
+    float max = 0;
+    for(int i = 0; i < _lengthInput; i++){
+        fftInput[i] = input[i];
+        max = max > fftInput[i] ? max : fftInput[i];
+        //cout << fftInput[i] << endl;
+    }
+    //cout << max << endl;
+    for(int i = 0; i < _numberOfCoefficients; i++){
+        fftCoefficients[i] = coefficients[i];
+        //cout << fftCoefficients[i] << endl;
+    }
+    
+    FFT::forward(_lengthFIRFFT, fftInput, NULL, fftReal1, fftImag1);
+    FFT::forward(_lengthFIRFFT, fftCoefficients, NULL, fftReal2, fftImag2);
+    for (int i = 0; i < _lengthFIRFFT; i++){
+        fftFilteredReal[i] = (fftReal1[i] * fftReal2[i]) - (fftImag1[i] * fftImag2[i]);
+        fftFilteredImag[i] = (fftReal1[i] * fftImag2[i]) + (fftReal2[i] * fftImag1[i]);
+    }
+    FFT::inverse(_lengthFIRFFT, fftFilteredReal, fftFilteredImag, fftOutputReal, fftOutputImag);
+    
+    max = 0;
+    for(int i = 0; i < _lengthInput; i++){
+        output[i] = fftOutputReal[i];
+        max = max > output[i] ? max : output[i];
+    }
+    //cout << max << endl;
+}
+
+void
+FIRFilter::cleanup()
+{
+    delete []fftInput;
+    fftInput = NULL;
+    delete []fftCoefficients;
+    fftCoefficients = NULL;
+    delete []fftReal1;
+    fftReal1 = NULL;
+    delete []fftImag1;
+    fftImag1 = NULL;
+    delete []fftReal2;
+    fftReal2 = NULL;
+    delete []fftImag2;
+    fftImag2 = NULL;
+    delete []fftFilteredReal;
+    fftFilteredReal = NULL;
+    delete []fftFilteredImag;
+    fftFilteredImag = NULL;
+    delete []fftOutputReal;
+    fftOutputReal = NULL;
+    delete []fftOutputImag;
+    fftOutputImag = NULL;
+}
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