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sndutils.h
00001 // 00002 // SYNTOPIA. See http://Syntopia.sourceforge.net for details and documentation. 00003 // 00004 // Author of this file: Mikael Hvidtfeldt Christensen (mikaelc@users.sourceforge.net) 00005 // 00006 00007 00008 00009 00010 #ifndef __sndutils__ 00011 #define __sndutils__ 00012 00013 #include "math.h" 00014 00015 00016 namespace SynthCore { 00017 00018 // ----------------------------------------------------------------------- 00019 00020 00022 00028 class DelayLine { 00029 public: 00030 float * bufferStart, * bufferEnd, * readPtr; 00031 float output1; 00032 float * temp; 00033 00035 int bufferLength; 00036 00038 float read(float input); 00039 00041 void setDelay(int D) {;} 00042 00044 DelayLine(int Length); 00045 00047 ~DelayLine(); 00048 00050 float readNBack(int N); 00051 00053 float readNForward(int N); 00054 }; 00055 00056 // ----------------------------------------------------------------------- 00057 00058 class Sample; 00059 00061 00069 class BiFilter { 00070 00071 private: 00072 00073 // Filter Coefficients and buffer vars 00074 float a0,a0INV,a1,a2,b0,b1,b2,x0,x1,x2,y0,y1,y2; 00075 float omega; 00076 float cs; 00077 float sn; 00078 float alpha; 00079 float beta; 00080 public: 00082 BiFilter() ; 00083 00085 ~BiFilter() {}; 00086 00088 float read(float input); 00089 00091 void bypassFreqAndQ(float freq, float Q); 00092 00094 void lowpassFreqAndQ(float freq, float Q); 00095 00097 void notchFreqAndQ(float freq, float Q); 00098 00100 void bandpass2FreqAndQ(float freq, float Q); 00101 00103 void bandpass1FreqAndQ(float freq, float Q); 00104 00106 void highpassFreqAndQ(float freq, float Q); 00107 00109 void allpassFreqAndQ(float freq, float Q); 00110 00112 void highShelfFreqAndQAndA(float freq, float Q, float A); 00113 00115 void lowShelfFreqAndQAndA(float freq, float Q, float A); 00116 00118 void peakingEQFreqAndQAndA(float freq, float Q, float A); 00119 00121 float getFreqResponse(float wT) ; 00122 00124 float getPhaseResponse(float wT) ; 00125 00127 float getFreqResponse2(float wT) ; 00128 00130 void getPolesAndZeroes(float &p1r,float &p1i,float &p2r,float &p2i,float &z1r,float &z1i,float &z2r,float &z2i); 00131 00134 void clone(BiFilter * from); 00135 00136 00138 Sample * getFreqResponseSample(int resolution); 00139 00141 Sample * getPhaseResponseSample(int resolution); 00142 00143 }; 00144 00145 // ----------------------------------------------------------------------- 00146 00148 00152 class Sample { 00153 00154 public: 00156 int length; 00157 00159 int wrap; 00160 00162 float samplingFreq; 00163 00165 float samplingTune; 00166 00168 float * samples; 00169 00171 Sample() {length=0; samplingFreq=0; samplingTune=0; wrap = 0;} 00172 00174 Sample(int sampleLength) {length=sampleLength; wrap=0; samples = new float[sampleLength];} 00175 00177 Sample(int sampleLength, int wrapAround) {length=sampleLength; wrap=wrapAround; samples = new float[sampleLength+wrapAround];} 00178 00180 ~Sample() {if (length != 0) {delete [] samples;} }; 00181 00183 float getMax() { 00184 float max = 0; 00185 00186 if (length != 0) {max = samples[0];} 00187 00188 for (int i=1; i<length; i++) { 00189 if (samples[i]>max) {max = samples[i];} 00190 } 00191 00192 return max; 00193 } 00194 00196 float getMin() { 00197 float min = 0; 00198 00199 if (length != 0) {min = samples[0];} 00200 00201 for (int i=1; i<length; i++) { 00202 if (samples[i]<min) {min = samples[i];} 00203 } 00204 00205 return min; 00206 } 00207 00209 void makeWrap() 00210 { 00211 for (int m=0; m<wrap; m++) { 00212 samples[length+m] = samples[m]; 00213 } 00214 } 00215 00217 void wavenormalize() 00218 { 00219 // normalize to values between -1,1. 00220 float min=getMin(); 00221 float max=getMax(); 00222 if (max!=min) 00223 for (int i=0; i<length+wrap; i++) { 00224 samples[i]=-1.0f+2.0f*(samples[i]-min)/(max-min); 00225 } 00226 } 00227 00229 void normalize() 00230 { 00231 // normalize to values between -1,1. 00232 float min=getMin(); 00233 float max=getMax(); 00234 if (max!=min) 00235 for (int i=0; i<length+wrap; i++) { 00236 samples[i]=(samples[i]-min)/(max-min); 00237 } 00238 } 00239 00240 00241 00242 }; 00243 00244 // ------------------------------------------------------------------------- 00245 00247 00248 class Fourier { 00249 public: 00255 void static transform(float data[], unsigned long nn, int isign); 00256 00258 Sample static * sawtooth(int sampleLength, int partials, int wrapAround); 00259 00261 Sample static * square(int sampleLength, int partials, int wrapAround); 00262 00264 Sample static * triangle(int sampleLength, int partials, int wrapAround); 00265 00268 Sample static * sine(int sampleLength, int partials, int wrapAround); 00269 00270 Sample static * wave1(int sampleLength, int partials, int wrapAround); 00271 Sample static * wave2(int sampleLength, int partials, int wrapAround); 00272 Sample static * wave3(int sampleLength, int partials, int wrapAround); 00273 Sample static * wave4(int sampleLength, int partials, int wrapAround); 00274 00275 }; 00276 00277 00278 // ------------------------------------------------------------------------ 00279 00281 00282 class FreqTable { 00283 private: 00284 double k ; // 12th root of 2 00285 public: 00287 float freqTab[128]; 00288 00299 FreqTable() { 00300 k = 1.059463094359; 00301 00302 00303 double a = 6.875;a *= k; // b 00304 a *= k; // bb 00305 a *= k; // c, frequency of midi note 0 00306 for (int i = 0; i < 128; i++) 00307 { 00308 freqTab[i] = (float)a; 00309 a *= k; 00310 } 00311 } 00312 00314 ~FreqTable() {;}; 00315 00318 int getMaxPartialsFromFreq(float freq) 00319 { 00320 return ((int) floor(24000.0f/freq)); 00321 } 00322 00324 int getMaxPartialsFromMidi(int midikey) 00325 { 00326 return getMaxPartialsFromFreq(freqTab[midikey]); 00327 } 00328 }; 00329 00330 00331 }; // end of namespace: SynthCore 00332 00333 #endif
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