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GrWeaverModHead.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 #ifndef _GRWEAVERMODHEAD_H_
00023 #define _GRWEAVERMODHEAD_H_
00024 
00025 #include <VrInterpolatingSigProc.h>
00026 
00038 template<class iType, class oType>
00039 class GrWeaverModHead : public VrInterpolatingSigProc<iType,oType> {
00040 public:
00041   GrWeaverModHead (int interp_factor) :
00042     VrInterpolatingSigProc<iType,oType>(2, interp_factor){}
00043 
00044   virtual const char *name () { return "GrWeaverModHead"; }
00045 
00046   virtual int work (VrSampleRange output, void *o[],
00047                     VrSampleRange inputs[], void *i[]);
00048 
00049   void initialize () { setOutputSize (interp * 4); }
00050 };
00051 
00052 
00053 template<class iType, class oType> int
00054 GrWeaverModHead<iType,oType>::work (VrSampleRange output, void *ao[],
00055                                     VrSampleRange inputs[], void *ai[])
00056 {
00057   iType *i = ((iType **) ai)[0];
00058   oType *oI = ((oType **) ao)[0];
00059   oType *oQ = ((oType **) ao)[1];
00060   int size = output.size;
00061   iType input_symbol;
00062 
00063   static const iType nco[4][2] = {
00064     // cos      sin
00065     {    1,     0 },
00066     {    0,     1 },
00067     {   -1,     0 },
00068     {    0,    -1 }
00069   };
00070 
00071   assert ((inputs[0].index & 0x3) == 0);
00072 
00073   for (int insamp = 0; insamp < size/interp; insamp++){
00074     input_symbol = i[insamp];
00075     *oI++ = input_symbol * nco[insamp & 0x3][0];
00076     *oQ++ = input_symbol * nco[insamp & 0x3][1];
00077     for (int outsamp = 1; outsamp < interp; outsamp++){
00078       *oI++ = 0;
00079       *oQ++ = 0;
00080     }
00081   }
00082   return output.size;
00083 }
00084 
00085 #endif /* _GRWEAVERMODHEAD_H_ */

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