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GrDelay.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2002 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 
00023 #ifndef _GRDELAY_H_
00024 #define _GRDELAY_H_
00025 
00026 #include <VrHistoryProc.h>
00027 
00028 template<class iType, class oType>
00029 class GrDelay : public VrHistoryProc<iType,oType>
00030 {
00031  public:
00032   GrDelay (unsigned int maxdelay);
00033 
00034   virtual const char *name () { return "GrDelay"; }
00035   virtual int work (VrSampleRange output, void *o[],
00036                     VrSampleRange inputs[], void *i[]);
00037   virtual void set_delay (unsigned int del) { del = (delay>history) ? history : delay; };
00038  protected:
00039   unsigned int delay;
00040 };
00041 
00042 template<class iType, class oType>
00043 GrDelay<iType, oType>::GrDelay (unsigned int maxdelay)
00044   : VrHistoryProc<iType, oType>(1), delay(maxdelay) 
00045 { 
00046   history = delay+1;
00047 }
00048 
00049 template<class iType, class oType> int
00050 GrDelay<iType, oType>::work (VrSampleRange output, void *ao[],
00051                                      VrSampleRange inputs[], void *ai[])
00052 {
00053   iType **in = (iType **) ai;
00054   oType **out = (oType **) ao;
00055   unsigned int size = output.size;
00056   for(unsigned int samp=0; samp < size; samp++)
00057     out[0][samp] = in[0][samp + history - delay];
00058 
00059   return output.size;
00060 }
00061 
00062 #endif

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