revmodel.cpp
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上传日期:2020-07-06
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文件大小:6k
源码类别:
midi
开发平台:
Unix_Linux
- // Reverb model implementation
- //
- //
- // Google Summer of Code 2007
- //
- // Authors: Biodun Osunkunle <biodun@videolan.org>
- //
- // Mentor : Jean-Baptiste Kempf <jb@videolan.org>
- //
- // Original written by Jezar at Dreampoint, June 2000
- // This code is public domain
- #include "revmodel.hpp"
- #include <stdlib.h>
- revmodel::revmodel()
- {
- // Tie the components to their buffers
- combL[0].setbuffer(bufcombL1,combtuningL1);
- combR[0].setbuffer(bufcombR1,combtuningR1);
- combL[1].setbuffer(bufcombL2,combtuningL2);
- combR[1].setbuffer(bufcombR2,combtuningR2);
- combL[2].setbuffer(bufcombL3,combtuningL3);
- combR[2].setbuffer(bufcombR3,combtuningR3);
- combL[3].setbuffer(bufcombL4,combtuningL4);
- combR[3].setbuffer(bufcombR4,combtuningR4);
- combL[4].setbuffer(bufcombL5,combtuningL5);
- combR[4].setbuffer(bufcombR5,combtuningR5);
- combL[5].setbuffer(bufcombL6,combtuningL6);
- combR[5].setbuffer(bufcombR6,combtuningR6);
- combL[6].setbuffer(bufcombL7,combtuningL7);
- combR[6].setbuffer(bufcombR7,combtuningR7);
- combL[7].setbuffer(bufcombL8,combtuningL8);
- combR[7].setbuffer(bufcombR8,combtuningR8);
- allpassL[0].setbuffer(bufallpassL1,allpasstuningL1);
- allpassR[0].setbuffer(bufallpassR1,allpasstuningR1);
- allpassL[1].setbuffer(bufallpassL2,allpasstuningL2);
- allpassR[1].setbuffer(bufallpassR2,allpasstuningR2);
- allpassL[2].setbuffer(bufallpassL3,allpasstuningL3);
- allpassR[2].setbuffer(bufallpassR3,allpasstuningR3);
- allpassL[3].setbuffer(bufallpassL4,allpasstuningL4);
- allpassR[3].setbuffer(bufallpassR4,allpasstuningR4);
- // Set default values
- allpassL[0].setfeedback(0.5f);
- allpassR[0].setfeedback(0.5f);
- allpassL[1].setfeedback(0.5f);
- allpassR[1].setfeedback(0.5f);
- allpassL[2].setfeedback(0.5f);
- allpassR[2].setfeedback(0.5f);
- allpassL[3].setfeedback(0.5f);
- allpassR[3].setfeedback(0.5f);
- setwet(initialwet);
- setroomsize(initialroom);
- setdry(initialdry);
- setdamp(initialdamp);
- setwidth(initialwidth);
- setmode(initialmode);
- // Buffer will be full of rubbish - so we MUST mute them
- mute();
- }
- void revmodel::mute()
- {
- int i;
- if (getmode() >= freezemode)
- return;
- for (i = 0 ; i < numcombs ; i++)
- {
- combL[i].mute();
- combR[i].mute();
- }
- for (i=0;i<numallpasses;i++)
- {
- allpassL[i].mute();
- allpassR[i].mute();
- }
- }
- /*****************************************************************************
- * Transforms the audio stream
- * /param float *inputL input buffer
- * /param float *outputL output buffer
- * /param long numsamples number of samples to be processed
- * /param int skip number of channels in the audio stream
- *****************************************************************************/
- void revmodel::processreplace(float *inputL, float *outputL, long numsamples, int skip)
- {
- float outL,outR,input;
- float inputR;
- int i;
- outL = outR = 0;
- /* TODO this module supports only 2 audio channels, let's improve this */
- if (skip > 1)
- inputR = inputL[1];
- else
- inputR = inputL[0];
- input = (inputL[0] + inputR) * gain;
- // Accumulate comb filters in parallel
- for(i=0; i<numcombs; i++)
- {
- outL += combL[i].process(input);
- outR += combR[i].process(input);
- }
- // Feed through allpasses in series
- for(i=0; i<numallpasses; i++)
- {
- outL = allpassL[i].process(outL);
- outR = allpassR[i].process(outR);
- }
- // Calculate output REPLACING anything already there
- outputL[0] = (outL*wet1 + outR*wet2 + inputR*dry);
- if (skip > 1)
- outputL[1] = (outR*wet1 + outL*wet2 + inputR*dry);
- }
- void revmodel::processmix(float *inputL, float *outputL, long numsamples, int skip)
- {
- float outL,outR,input;
- float inputR;
- int i;
- outL = outR = 0;
- if (skip > 1)
- inputR = inputL[1];
- else
- inputR = inputL[0];
- input = (inputL[0] + inputR) * gain;
- // Accumulate comb filters in parallel
- for(i=0; i<numcombs; i++)
- {
- outL += combL[i].process(input);
- outR += combR[i].process(input);
- }
- // Feed through allpasses in series
- for(i=0; i<numallpasses; i++)
- {
- outL = allpassL[i].process(outL);
- outR = allpassR[i].process(outR);
- }
- // Calculate output REPLACING anything already there
- outputL[0] += (outL*wet1 + outR*wet2 + inputR*dry);
- if (skip > 1)
- outputL[1] += (outR*wet1 + outL*wet2 + inputR*dry);
- }
- void revmodel::update()
- {
- // Recalculate internal values after parameter change
- int i;
- wet1 = wet*(width/2 + 0.5f);
- wet2 = wet*((1-width)/2);
- if (mode >= freezemode)
- {
- roomsize1 = 1;
- damp1 = 0;
- gain = muted;
- }
- else
- {
- roomsize1 = roomsize;
- damp1 = damp;
- gain = fixedgain;
- }
- for(i=0; i<numcombs; i++)
- {
- combL[i].setfeedback(roomsize1);
- combR[i].setfeedback(roomsize1);
- }
- for(i=0; i<numcombs; i++)
- {
- combL[i].setdamp(damp1);
- combR[i].setdamp(damp1);
- }
- }
- // The following get/set functions are not inlined, because
- // speed is never an issue when calling them, and also
- // because as you develop the reverb model, you may
- // wish to take dynamic action when they are called.
- void revmodel::setroomsize(float value)
- {
- roomsize = (value*scaleroom) + offsetroom;
- update();
- }
- float revmodel::getroomsize()
- {
- return (roomsize-offsetroom)/scaleroom;
- }
- void revmodel::setdamp(float value)
- {
- damp = value*scaledamp;
- update();
- }
- float revmodel::getdamp()
- {
- return damp/scaledamp;
- }
- void revmodel::setwet(float value)
- {
- wet = value*scalewet;
- update();
- }
- float revmodel::getwet()
- {
- return wet/scalewet;
- }
- void revmodel::setdry(float value)
- {
- dry = value*scaledry;
- }
- float revmodel::getdry()
- {
- return dry/scaledry;
- }
- void revmodel::setwidth(float value)
- {
- width = value;
- update();
- }
- float revmodel::getwidth()
- {
- return width;
- }
- void revmodel::setmode(float value)
- {
- mode = value;
- update();
- }
- float revmodel::getmode()
- {
- if (mode >= freezemode)
- return 1;
- else
- return 0;
- }
- //ends