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VrInterpolatingSigProcNoWork.h

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00001 /* -*- Mode: c++ -*- */ 00002 /* 00003 * Copyright 2001,2003 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 * Copyright 1997 Massachusetts Institute of Technology 00024 * 00025 * Permission to use, copy, modify, distribute, and sell this software and its 00026 * documentation for any purpose is hereby granted without fee, provided that 00027 * the above copyright notice appear in all copies and that both that 00028 * copyright notice and this permission notice appear in supporting 00029 * documentation, and that the name of M.I.T. not be used in advertising or 00030 * publicity pertaining to distribution of the software without specific, 00031 * written prior permission. M.I.T. makes no representations about the 00032 * suitability of this software for any purpose. It is provided "as is" 00033 * without express or implied warranty. 00034 * 00035 */ 00036 00037 /* 00038 * Crock to work around compiler bug. This really show be the 00039 * base template for VrInterpolatingSigProc, but I'm not going to 00040 * bother. This stuff should all be gone in a month or two. 00041 */ 00042 00043 #ifndef _VrINTERPOLATINGSIGPROCNOWORK_H_ 00044 #define _VrINTERPOLATINGSIGPROCNOWORK_H_ 00045 00046 #include <VrHistoryProc.h> 00047 00048 template<class iType, class oType> 00049 class VrInterpolatingSigProcNoWork : public VrHistoryProc<iType,oType> { 00050 00051 protected: 00052 int interp; 00053 00054 public: 00055 virtual int forecast(VrSampleRange output, 00056 VrSampleRange inputs[]); 00057 00058 virtual void pre_initialize (); 00059 00060 VrInterpolatingSigProcNoWork() : interp(1) {} 00061 00062 VrInterpolatingSigProcNoWork(int outputs) : 00063 VrHistoryProc<iType, oType>(outputs), 00064 interp(1) {} 00065 00066 VrInterpolatingSigProcNoWork(int outputs, int i) : 00067 VrHistoryProc<iType, oType>(outputs), 00068 interp(i) {} 00069 00070 virtual ~VrInterpolatingSigProcNoWork() {} 00071 00072 }; 00073 00074 template<class iType,class oType> int 00075 VrInterpolatingSigProcNoWork<iType,oType>::forecast(VrSampleRange output, 00076 VrSampleRange inputs[]) { 00077 /* 1:interp ratio */ 00078 /* 00079 * Note that this code only works correctly if output size of the 00080 * module (set using setOutputSize(n) in initialize() ) is a multiple 00081 * of interp. 00082 */ 00083 assert ((output.size % interp) == 0); 00084 00085 for(unsigned int i=0;i<numberInputs;i++) { 00086 inputs[i].index=output.index/interp; /* ! do not subtract history ! */ 00087 inputs[i].size=output.size/interp + history-1; 00088 } 00089 return 0; 00090 } 00091 00092 00093 template<class iType,class oType> void 00094 VrInterpolatingSigProcNoWork<iType,oType>::pre_initialize () 00095 { 00096 assert (interp >= 1); 00097 if (interp == 1){ 00098 fprintf (stderr, "### Warning: interp == 1 in pre_initialize of %s. Are you sure?\n", 00099 name ()); 00100 } 00101 if (getSamplingFrequency () == 0.0) 00102 setSamplingFrequency (getInputSamplingFrequencyN (0) * interp); 00103 00104 setOutputSize(interp); 00105 } 00106 00107 #endif

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