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Diffstat (limited to 'ofxMaxim/ofMaximWindowsVS2008_emptyExample/src/maximilian.cpp')
| -rwxr-xr-x | ofxMaxim/ofMaximWindowsVS2008_emptyExample/src/maximilian.cpp | 709 |
1 files changed, 709 insertions, 0 deletions
diff --git a/ofxMaxim/ofMaximWindowsVS2008_emptyExample/src/maximilian.cpp b/ofxMaxim/ofMaximWindowsVS2008_emptyExample/src/maximilian.cpp new file mode 100755 index 0000000..a0ee618 --- /dev/null +++ b/ofxMaxim/ofMaximWindowsVS2008_emptyExample/src/maximilian.cpp @@ -0,0 +1,709 @@ + +/* + * maximilian.cpp + * platform independent synthesis library using portaudio or rtaudio + * + * Created by Mick Grierson on 29/12/2009. + * Copyright 2009 Mick Grierson & Strangeloop Limited. All rights reserved. + * Thanks to the Goldsmiths Creative Computing Team. + * Special thanks to Arturo Castro for the PortAudio implementation. + * + * 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. + * + */ + +#include "maximilian.h" +#include "math.h" + +int channels=2; +int samplerate=44100; +int buffersize=1024; +float chandiv= 1; + +double sineBuffer[514]={0,0.012268,0.024536,0.036804,0.049042,0.06131,0.073547,0.085785,0.097992,0.1102,0.12241,0.13455,0.1467,0.15884,0.17093,0.18301,0.19507,0.20709,0.21909,0.23105,0.24295,0.25485,0.26669,0.2785,0.29025,0.30197,0.31366,0.32529,0.33685,0.34839,0.35986,0.37128,0.38266,0.39395,0.40521,0.41641,0.42752,0.4386,0.44958,0.46051,0.47137,0.48215,0.49286,0.50351,0.51407,0.52457,0.53497,0.54529,0.55554,0.5657,0.57578,0.58575,0.59567,0.60547,0.6152,0.62482,0.63437,0.6438,0.65314,0.66238,0.67151,0.68057,0.68951,0.69833,0.70706,0.7157,0.72421,0.7326,0.74091,0.74908,0.75717,0.76514,0.77298,0.7807,0.7883,0.79581,0.80316,0.81042,0.81754,0.82455,0.83142,0.8382,0.84482,0.85132,0.8577,0.86392,0.87006,0.87604,0.88187,0.8876,0.89319,0.89862,0.90396,0.90912,0.91415,0.91907,0.92383,0.92847,0.93295,0.93729,0.9415,0.94556,0.94949,0.95325,0.95691,0.96039,0.96375,0.96692,0.97,0.9729,0.97565,0.97827,0.98074,0.98306,0.98523,0.98724,0.98914,0.99084,0.99243,0.99387,0.99515,0.99628,0.99725,0.99808,0.99875,0.99927,0.99966,0.99988,0.99997,0.99988,0.99966,0.99927,0.99875,0.99808,0.99725,0.99628,0.99515,0.99387,0.99243,0.99084,0.98914,0.98724,0.98523,0.98306,0.98074,0.97827,0.97565,0.9729,0.97,0.96692,0.96375,0.96039,0.95691,0.95325,0.94949,0.94556,0.9415,0.93729,0.93295,0.92847,0.92383,0.91907,0.91415,0.90912,0.90396,0.89862,0.89319,0.8876,0.88187,0.87604,0.87006,0.86392,0.8577,0.85132,0.84482,0.8382,0.83142,0.82455,0.81754,0.81042,0.80316,0.79581,0.7883,0.7807,0.77298,0.76514,0.75717,0.74908,0.74091,0.7326,0.72421,0.7157,0.70706,0.69833,0.68951,0.68057,0.67151,0.66238,0.65314,0.6438,0.63437,0.62482,0.6152,0.60547,0.59567,0.58575,0.57578,0.5657,0.55554,0.54529,0.53497,0.52457,0.51407,0.50351,0.49286,0.48215,0.47137,0.46051,0.44958,0.4386,0.42752,0.41641,0.40521,0.39395,0.38266,0.37128,0.35986,0.34839,0.33685,0.32529,0.31366,0.30197,0.29025,0.2785,0.26669,0.25485,0.24295,0.23105,0.21909,0.20709,0.19507,0.18301,0.17093,0.15884,0.1467,0.13455,0.12241,0.1102,0.097992,0.085785,0.073547,0.06131,0.049042,0.036804,0.024536,0.012268,0,-0.012268,-0.024536,-0.036804,-0.049042,-0.06131,-0.073547,-0.085785,-0.097992,-0.1102,-0.12241,-0.13455,-0.1467,-0.15884,-0.17093,-0.18301,-0.19507,-0.20709,-0.21909,-0.23105,-0.24295,-0.25485,-0.26669,-0.2785,-0.29025,-0.30197,-0.31366,-0.32529,-0.33685,-0.34839,-0.35986,-0.37128,-0.38266,-0.39395,-0.40521,-0.41641,-0.42752,-0.4386,-0.44958,-0.46051,-0.47137,-0.48215,-0.49286,-0.50351,-0.51407,-0.52457,-0.53497,-0.54529,-0.55554,-0.5657,-0.57578,-0.58575,-0.59567,-0.60547,-0.6152,-0.62482,-0.63437,-0.6438,-0.65314,-0.66238,-0.67151,-0.68057,-0.68951,-0.69833,-0.70706,-0.7157,-0.72421,-0.7326,-0.74091,-0.74908,-0.75717,-0.76514,-0.77298,-0.7807,-0.7883,-0.79581,-0.80316,-0.81042,-0.81754,-0.82455,-0.83142,-0.8382,-0.84482,-0.85132,-0.8577,-0.86392,-0.87006,-0.87604,-0.88187,-0.8876,-0.89319,-0.89862,-0.90396,-0.90912,-0.91415,-0.91907,-0.92383,-0.92847,-0.93295,-0.93729,-0.9415,-0.94556,-0.94949,-0.95325,-0.95691,-0.96039,-0.96375,-0.96692,-0.97,-0.9729,-0.97565,-0.97827,-0.98074,-0.98306,-0.98523,-0.98724,-0.98914,-0.99084,-0.99243,-0.99387,-0.99515,-0.99628,-0.99725,-0.99808,-0.99875,-0.99927,-0.99966,-0.99988,-0.99997,-0.99988,-0.99966,-0.99927,-0.99875,-0.99808,-0.99725,-0.99628,-0.99515,-0.99387,-0.99243,-0.99084,-0.98914,-0.98724,-0.98523,-0.98306,-0.98074,-0.97827,-0.97565,-0.9729,-0.97,-0.96692,-0.96375,-0.96039,-0.95691,-0.95325,-0.94949,-0.94556,-0.9415,-0.93729,-0.93295,-0.92847,-0.92383,-0.91907,-0.91415,-0.90912,-0.90396,-0.89862,-0.89319,-0.8876,-0.88187,-0.87604,-0.87006,-0.86392,-0.8577,-0.85132,-0.84482,-0.8382,-0.83142,-0.82455,-0.81754,-0.81042,-0.80316,-0.79581,-0.7883,-0.7807,-0.77298,-0.76514,-0.75717,-0.74908,-0.74091,-0.7326,-0.72421,-0.7157,-0.70706,-0.69833,-0.68951,-0.68057,-0.67151,-0.66238,-0.65314,-0.6438,-0.63437,-0.62482,-0.6152,-0.60547,-0.59567,-0.58575,-0.57578,-0.5657,-0.55554,-0.54529,-0.53497,-0.52457,-0.51407,-0.50351,-0.49286,-0.48215,-0.47137,-0.46051,-0.44958,-0.4386,-0.42752,-0.41641,-0.40521,-0.39395,-0.38266,-0.37128,-0.35986,-0.34839,-0.33685,-0.32529,-0.31366,-0.30197,-0.29025,-0.2785,-0.26669,-0.25485,-0.24295,-0.23105,-0.21909,-0.20709,-0.19507,-0.18301,-0.17093,-0.15884,-0.1467,-0.13455,-0.12241,-0.1102,-0.097992,-0.085785,-0.073547,-0.06131,-0.049042,-0.036804,-0.024536,-0.012268,0,0.012268 +}; + +void setup();//use this to do any initialisation if you want. + +void play(double *channels);//run dac! + +maxiOsc::maxiOsc(){ + phase = 0.0; +// memset(phases,0,500); +// memset(freqs,0,500); +} + +double maxiOsc::noise() { + //always the same unless you seed it. + float r = rand()/(float)RAND_MAX; + output=r*2-1; + return(output); +} + +double maxiOsc::sinewave(double frequency) { + output=sin (phase*(TWOPI)); + if ( phase >= 1.0 ) phase -= 1.0; + phase += (1./(samplerate/(frequency))); + return(output); + +} + +double maxiOsc::sinebuf4(double frequency) { + double remainder; + double a,b,c,d,a1,a2,a3; + phase += 512./(samplerate/(frequency)); + if ( phase >= 511 ) phase -=512; + remainder = phase - floor(phase); + + if (phase==0) { + a=sineBuffer[(long) 512]; + b=sineBuffer[(long) phase]; + c=sineBuffer[(long) phase+1]; + d=sineBuffer[(long) phase+2]; + + } else { + a=sineBuffer[(long) phase-1]; + b=sineBuffer[(long) phase]; + c=sineBuffer[(long) phase+1]; + d=sineBuffer[(long) phase+2]; + + } + + a1 = 0.5f * (c - a); + a2 = a - 2.5 * b + 2.f * c - 0.5f * d; + a3 = 0.5f * (d - a) + 1.5f * (b - c); + output = double (((a3 * remainder + a2) * remainder + a1) * remainder + b); + return(output); +} + +double maxiOsc::sinebuf(double frequency) { + double remainder=0.0; + phase += 512./(samplerate/(frequency*chandiv)); + if ( phase >= 511.0 ) phase -=512.0; + remainder = phase - floor(phase); + output = (double) ((1-remainder) * sineBuffer[1+ (long) phase] + remainder * sineBuffer[2+(long) phase]); + return(output); +} + +double maxiOsc::coswave(double frequency) { + output=cos (phase*(TWOPI)); + if ( phase >= 1.0 ) phase -= 1.0; + phase += (1./(samplerate/(frequency))); + return(output); + +} + +double maxiOsc::phasor(double frequency) { + output=phase; + if ( phase >= 1.0 ) phase -= 1.0; + phase += (1./(samplerate/(frequency))); + return(output); +} + +double maxiOsc::square(double frequency) { + if (phase<0.5) output=-1; + if (phase>0.5) output=1; + if ( phase >= 1.0 ) phase -= 1.0; + phase += (1./(samplerate/(frequency))); + return(output); +} + +double maxiOsc::pulse(double frequency, double duty) { + if (duty<0.) duty=0; + if (duty>1.) duty=1; + if ( phase >= 1.0 ) phase -= 1.0; + phase += (1./(samplerate/(frequency))); + if (phase<duty) output=-1.; + if (phase>duty) output=1.; + return(output); +} + +double maxiOsc::phasor(double frequency, double startphase, double endphase) { + output=phase; + if (phase<startphase) { + phase=startphase; + } + if ( phase >= endphase ) phase = startphase; + phase += ((endphase-startphase)/(samplerate/(frequency))); + return(output); +} + + +double maxiOsc::saw(double frequency) { + + output=phase; + if ( phase >= 1.0 ) phase -= 2.0; + phase += (1./(samplerate/(frequency))); + return(output); + +} + +double maxiOsc::triangle(double frequency, double phase) { + output=tri*2; + if ( phase >= 1.0 ) phase -= 1.0; + phase += (1./(samplerate/(frequency*chandiv))); + if (phase <= 0.5 ) { + tri = phase; + } else { + tri =(1-phase); + } + return(output); + +} + + +//I like this. +double maxiEnvelope::line(int numberofsegments,double segments[1000]) { + period=2./(segments[valindex+1]*0.004); + nextval=segments[valindex+2]; + currentval=segments[valindex]; + if (currentval-amplitude > 0.0000001 && valindex < numberofsegments) { + amplitude += ((currentval-startval)/(samplerate/period)); + } else if (currentval-amplitude < -0.0000001 && valindex < numberofsegments) { + amplitude -= (((currentval-startval)*(-1))/(samplerate/period)); + } else if (valindex >numberofsegments-1) { + valindex=numberofsegments-2; + } else { + valindex=valindex+2; + startval=currentval; + } + output=amplitude; + return(output); +} + +//and this +void maxiEnvelope::trigger(int index,double amp) { + valindex=index; + amplitude=amp; + +} + +//and this +double maxiDelayline::dl(double input, int size, double feedback) { + if ( phase >=size ) phase = 0; + memory[phase]=(memory[phase]*feedback)+(input*feedback)*0.5; + phase+=1; + output=memory[phase+1]; + return(output); + +} + +double maxiDelayline::dl(double input, int size, double feedback, int position) { + if ( phase >=size ) phase = 0; + if ( position >=size ) position = 0; + memory[phase]=(memory[phase]*feedback)+(input*feedback)*chandiv; + phase+=1; + output=memory[position]; + return(output); + +} + +//I particularly like these. cutoff between 0 and 1 +double maxiFilter::lopass(double input, double cutoff) { + output=outputs[0] + cutoff*(input-outputs[0]); + outputs[0]=output; + return(output); +} +//as above +double maxiFilter::hipass(double input, double cutoff) { + output=input-(outputs[0] + cutoff*(input-outputs[0])); + outputs[0]=output; + return(output); +} +//awesome. cuttof is freq in hz. res is between 1 and whatever. Watch out! +double maxiFilter::lores(double input,double cutoff1, double resonance) { + cutoff=cutoff1*0.5; + if (cutoff>(samplerate*0.25)) cutoff=(samplerate*0.25); + if (resonance<1.) resonance = 1.; + z=cos(TWOPI*cutoff/samplerate); + c=2-2*z; + double r=(sqrt(2.0)*sqrt(-pow((z-1),3.0))+resonance*(z-1))/(resonance*(z-1)); + x=x+(input-y)*c; + y=y+x; + x=x*r; + output=y; + return(output); +} + +//this is just stupid. Kindof works. +double maxiFilter::hires(double input,double cutoff1, double resonance) { + cutoff=cutoff1*0.5; + if (cutoff>(samplerate*0.25)) cutoff=(samplerate*0.25); + if (resonance<1.) resonance = 1.; + z=cos(TWOPI*cutoff/samplerate); + c=2-2*z; + double r=(sqrt(2.0)*sqrt(-pow((z-1),3.0))+resonance*(z-1))/(resonance*(z-1)); + x=x+(input-y)*c; + y=y+x; + x=x*r; + output=input-y; + return(output); +} + +//This works a bit. Needs attention. +double maxiFilter::bandpass(double input,double cutoff1, double resonance) { + cutoff=cutoff1; + if (cutoff>(samplerate*0.5)) cutoff=(samplerate*0.5); + if (resonance>=1.) resonance=0.999999; + z=cos(TWOPI*cutoff/samplerate); + inputs[0] = (1-resonance)*(sqrt(resonance*(resonance-4*pow(z,2)+2)+1)); + inputs[1] = 2*z*resonance; + inputs[2] = pow((resonance*-1),2); + + output=inputs[0]*input+inputs[1]*outputs[1]+inputs[2]*outputs[2]; + outputs[2]=outputs[1]; + outputs[1]=output; + return(output); +} + +//stereo bus +double *maxiMix::stereo(double input,double two[2],double x) { + if (x>1) x=1; + if (x<0) x=0; + two[0]=input*sqrt(1-x); + two[1]=input*sqrt(x); + return(two); +} + +//quad bus +double *maxiMix::quad(double input,double four[4],double x,double y) { + if (x>1) x=1; + if (x<0) x=0; + if (y>1) y=1; + if (y<0) y=0; + four[0]=input*sqrt((1-x)*y); + four[1]=input*sqrt((1-x)*(1-y)); + four[2]=input*sqrt(x*y); + four[3]=input*sqrt(x*(1-y)); + return(four); +} + +//ambisonic bus +double *maxiMix::ambisonic(double input,double eight[8],double x,double y,double z) { + if (x>1) x=1; + if (x<0) x=0; + if (y>1) y=1; + if (y<0) y=0; + if (z>1) y=1; + if (z<0) y=0; + eight[0]=input*(sqrt((1-x)*y)*1-z); + eight[1]=input*(sqrt((1-x)*(1-y))*1-z); + eight[2]=input*(sqrt(x*y)*1-z); + eight[3]=input*(sqrt(x*(1-y))*1-z); + eight[4]=input*(sqrt((1-x)*y)*z); + eight[5]=input*(sqrt((1-x)*(1-y))*z); + eight[6]=input*sqrt((x*y)*z); + eight[7]=input*sqrt((x*(1-y))*z); + return(eight); +} + + +bool maxiSample::load(string fileName) { + myPath = ofToDataPath(fileName); + return read(); +} + +double maxiSample::play() { + long length=myDataSize*(1./myChannels); + double remainder; + short* buffer = (short *)myData; + position=(position+1); + remainder = position - (long) position; + if ((long) position>length) position=0; + output = (double) ((1-remainder) * buffer[1+ (long) position] + remainder * buffer[2+(long) position])/32767;//linear interpolation + return(output); +} + +double maxiSample::play(double speed) { + double remainder; + long a,b; +// long length=myDataSize*0.5; + short* buffer = (short *)myData; + position=position+((speed*chandiv*myChannels)/(samplerate/mySampleRate)); + if (speed >=0) { + + if ((long) position>=length-1) position=1; + remainder = position - floor(position); + if (position+1<length) { + a=position+1; + + } + else { + a=length-1; + } + if (position+2<length) + { + b=position+2; + } + else { + b=length-1; + } + + output = (double) ((1-remainder) * buffer[a] + remainder * buffer[b])/32767;//linear interpolation +} else { + if ((long) position<0) position=length; + remainder = position - floor(position); + if (position-1>=0) { + a=position-1; + + } + else { + a=0; + } + if (position-2>=0) { + b=position-2; + } + else { + b=0; + } + output = (double) ((-1-remainder) * buffer[a] + remainder * buffer[b])/32767;//linear interpolation + } + return(output); +} + +double maxiSample::play(double frequency, double start, double end) { + double remainder; +// long length=myDataSize; + if (end>=length) end=length-1; + long a,b; + short* buffer = (short *)myData; + if (frequency >0.) { + if (position<start) { + position=start; + } + + if ( position >= end ) position = start; + position += ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + long pos = floor(position); + if (pos+1<length) { + a=pos+1; + + } + else { + a=pos-1; + } + if (pos+2<length) { + b=pos+2; + } + else { + b=length-1; + } + + output = (double) ((1-remainder) * buffer[a] + + remainder * buffer[b])/32767;//linear interpolation + } else { + frequency=frequency-(frequency+frequency); + if ( position <= start ) position = end; + position -= ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + long pos = floor(position); + if (pos-1>=0) { + a=pos-1; + } + else { + a=0; + } + if (pos-2>=0) { + b=pos-2; + } + else { + b=0; + } + output = (double) ((-1-remainder) * buffer[a] + + remainder * buffer[b])/32767;//linear interpolation + + } + + return(output); +} + +//better cubic inerpolation. Cobbled together from various (pd externals, yehar, other places). +double maxiSample::play4(double frequency, double start, double end) { + double remainder; + double a,b,c,d,a1,a2,a3; + short* buffer = (short*)myData; + if (frequency >0.) { + if (position<start) { + position=start; + } + if ( position >= end ) position = start; + position += ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + if (position>0) { + a=buffer[(int)(floor(position))-1]; + + } else { + a=buffer[0]; + + } + + b=buffer[(long) position]; + if (position<end-2) { + c=buffer[(long) position+1]; + + } else { + c=buffer[0]; + + } + if (position<end-3) { + d=buffer[(long) position+2]; + + } else { + d=buffer[0]; + } + a1 = 0.5f * (c - a); + a2 = a - 2.5 * b + 2.f * c - 0.5f * d; + a3 = 0.5f * (d - a) + 1.5f * (b - c); + output = (double) (((a3 * remainder + a2) * remainder + a1) * remainder + b) / 32767; + + } else { + frequency=frequency-(frequency+frequency); + if ( position <= start ) position = end; + position -= ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + if (position>start && position < end-1) { + a=buffer[(long) position+1]; + + } else { + a=buffer[0]; + + } + + b=buffer[(long) position]; + if (position>start) { + c=buffer[(long) position-1]; + + } else { + c=buffer[0]; + + } + if (position>start+1) { + d=buffer[(long) position-2]; + + } else { + d=buffer[0]; + } + a1 = 0.5f * (c - a); + a2 = a - 2.5 * b + 2.f * c - 0.5f * d; + a3 = 0.5f * (d - a) + 1.5f * (b - c); + output = (double) (((a3 * remainder + a2) * -remainder + a1) * -remainder + b) / 32767; + + } + + return(output); +} + +double maxiSample::bufferPlay(unsigned char &bufferin,long length) { + double remainder; + short* buffer = (short *)bufferin; + position=(position+1); + remainder = position - (long) position; + if ((long) position>length) position=0; + output = (double) ((1-remainder) * buffer[1+ (long) position] + remainder * buffer[2+(long) position])/32767;//linear interpolation + return(output); +} + +double maxiSample::bufferPlay(unsigned char &bufferin,double speed,long length) { + double remainder; + long a,b; + short* buffer = (short *)bufferin; + position=position+((speed*chandiv*myChannels)/(samplerate/mySampleRate)); + if (speed >=0) { + + if ((long) position>=length-1) position=1; + remainder = position - floor(position); + if (position+1<length) { + a=position+1; + + } + else { + a=length-1; + } + if (position+2<length) + { + b=position+2; + } + else { + b=length-1; + } + + output = (double) ((1-remainder) * buffer[a] + remainder * buffer[b])/32767;//linear interpolation + } else { + if ((long) position<0) position=length; + remainder = position - floor(position); + if (position-1>=0) { + a=position-1; + + } + else { + a=0; + } + if (position-2>=0) { + b=position-2; + } + else { + b=0; + } + output = (double) ((-1-remainder) * buffer[a] + remainder * buffer[b])/32767;//linear interpolation + } + return(output); +} + +double maxiSample::bufferPlay(unsigned char &bufferin,double frequency, double start, double end) { + double remainder; + length=end; + long a,b; + short* buffer = (short *)bufferin; + if (frequency >0.) { + if (position<start) { + position=start; + } + + if ( position >= end ) position = start; + position += ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + long pos = floor(position); + if (pos+1<length) { + a=pos+1; + + } + else { + a=pos-1; + } + if (pos+2<length) { + b=pos+2; + } + else { + b=length-1; + } + + output = (double) ((1-remainder) * buffer[a] + + remainder * buffer[b])/32767;//linear interpolation + } else { + frequency=frequency-(frequency+frequency); + if ( position <= start ) position = end; + position -= ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + long pos = floor(position); + if (pos-1>=0) { + a=pos-1; + } + else { + a=0; + } + if (pos-2>=0) { + b=pos-2; + } + else { + b=0; + } + output = (double) ((-1-remainder) * buffer[a] + + remainder * buffer[b])/32767;//linear interpolation + + } + + return(output); +} + +//better cubic inerpolation. Cobbled together from various (pd externals, yehar, other places). +double maxiSample::bufferPlay4(unsigned char &bufferin,double frequency, double start, double end) { + double remainder; + double a,b,c,d,a1,a2,a3; + short* buffer = (short*)bufferin; + if (frequency >0.) { + if (position<start) { + position=start; + } + if ( position >= end ) position = start; + position += ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + if (position>0) { + a=buffer[(int)(floor(position))-1]; + + } else { + a=buffer[0]; + + } + + b=buffer[(long) position]; + if (position<end-2) { + c=buffer[(long) position+1]; + + } else { + c=buffer[0]; + + } + if (position<end-3) { + d=buffer[(long) position+2]; + + } else { + d=buffer[0]; + } + a1 = 0.5f * (c - a); + a2 = a - 2.5 * b + 2.f * c - 0.5f * d; + a3 = 0.5f * (d - a) + 1.5f * (b - c); + output = (double) (((a3 * remainder + a2) * remainder + a1) * remainder + b) / 32767; + + } else { + frequency=frequency-(frequency+frequency); + if ( position <= start ) position = end; + position -= ((end-start)/(samplerate/(frequency*chandiv))); + remainder = position - floor(position); + if (position>start && position < end-1) { + a=buffer[(long) position+1]; + + } else { + a=buffer[0]; + + } + + b=buffer[(long) position]; + if (position>start) { + c=buffer[(long) position-1]; + + } else { + c=buffer[0]; + + } + if (position>start+1) { + d=buffer[(long) position-2]; + + } else { + d=buffer[0]; + } + a1 = 0.5f * (c - a); + a2 = a - 2.5 * b + 2.f * c - 0.5f * d; + a3 = 0.5f * (d - a) + 1.5f * (b - c); + output = (double) (((a3 * remainder + a2) * -remainder + a1) * -remainder + b) / 32767; + + } + + return(output); +} + + +void maxiSample::getLength() { + length=myDataSize*0.5; +} + + |