Marsyas  0.6.0-alpha
/usr/src/RPM/BUILD/marsyas-0.6.0/src/marsyas/marsystems/Delay.h
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00001 /*
00002 ** Copyright (C) 1998-2006 George Tzanetakis <gtzan@cs.uvic.ca>
00003 **
00004 ** This program is free software; you can redistribute it and/or modify
00005 ** it under the terms of the GNU General Public License as published by
00006 ** the Free Software Foundation; either version 2 of the License, or
00007 ** (at your option) any later version.
00008 **
00009 ** This program is distributed in the hope that it will be useful,
00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 ** GNU General Public License for more details.
00013 **
00014 ** You should have received a copy of the GNU General Public License
00015 ** along with this program; if not, write to the Free Software
00016 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017 */
00018 
00019 #ifndef MARSYAS_DELAY_H
00020 #define MARSYAS_DELAY_H
00021 
00022 #include <marsyas/system/MarSystem.h>
00023 
00024 namespace Marsyas
00025 {
00044 class Delay: public MarSystem
00045 {
00046 private:
00047   void addControls();
00048   void myUpdate(MarControlPtr sender);
00049 
00050   // required for allocating the delay buffer
00051   mrs_natural   nextPowOfTwo (mrs_natural value);
00052   // get the increment per sample for the delay control value
00053   static void getLinearInterPInc (const mrs_realvec startVal, const mrs_realvec stopVal,
00054                                   mrs_realvec &incVal, const mrs_natural numSamples);
00055 
00056   // conversion functions
00057   mrs_real samples2Seconds (mrs_real samples);
00058   mrs_real seconds2Samples (mrs_real seconds);
00059   mrs_realvec samples2Seconds (mrs_realvec samples);
00060   mrs_realvec seconds2Samples (mrs_realvec seconds);
00061 
00062   // parameters
00063   mrs_real  maxDelayLengthInSamples_,
00064             singleDelayInSamples_;
00065 
00067   mrs_realvec   buffer_;
00068 
00069 
00070   mrs_realvec delayInSamples_,      
00071               prevDelayInSamples_,  
00072               ctrlIncrement_;           
00073 
00074   mrs_natural writeCursor_, 
00075               cursorMask_;  
00076 
00077 public:
00078   Delay(std::string name);
00079   ~Delay();
00080   MarSystem* clone() const;
00081 
00082   void myProcess(realvec& in, realvec& out);
00083 
00084 protected:
00085   Delay(const Delay& a);
00086 
00087 };
00088 
00089 }//namespace Marsyas
00090 
00091 #endif