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GrBitSource.h

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00001 /* -*- Mode: c++ -*- */
00002 /*
00003  * Copyright 2001 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 #ifndef _GRBITSOURCE_H_
00039 #define _GRBITSOURCE_H_
00040 
00041 #include <VrSource.h>
00042 #include <stdlib.h>
00043 
00044 enum { GR_RANDOM, GR_FILE, GR_PATTERN };
00045 
00046 template<class oType> 
00047 class GrBitSource : public VrSource<oType> {
00048 protected:
00049   int type;
00050   int mask;
00051 public:
00052   virtual const char *name() { return "GrBitSource"; }
00053 
00054   virtual int work2(VrSampleRange output, void *o[]);
00055 
00056   GrBitSource(double sampfreq, int type, int bps)  
00057     :type(type),mask( (1<<bps) - 1) {
00058     setSamplingFrequency(sampfreq);
00059   }
00060     
00061   GrBitSource(double sampfreq, int type)
00062     :type(type),mask(1) {
00063     setSamplingFrequency(sampfreq);
00064   }
00065 
00066 };
00067 
00068 template<class oType> int
00069 GrBitSource<oType>::work2(VrSampleRange output, void *ao[])
00070 { 
00071   oType **o = (oType **)ao;
00072   unsigned int size = output.size;
00073   if(type == GR_RANDOM)
00074     for (unsigned int i=0; i<size; i++) 
00075       *o[0]++ = random() & mask;     // This is ok on the linux C library
00076   else
00077     {
00078       cerr << "Unsupported Bit Type" << endl;
00079       exit(-1);
00080     }
00081   return output.size;              // Others should use the slower mod method
00082 }
00083 
00084 #endif 

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