Main Page | Namespace List | Class Hierarchy | Class List | File List | Namespace Members | Class Members | File Members | Related Pages

VrBits2Symbols.h

Go to the documentation of this file.
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 #ifndef _VRBITS2SYMBOLS_H_ 00024 #define _VRBITS2SYMBOLS_H_ 00025 00026 #include <VrSigProc.h> 00027 00028 00029 class VrBits2Symbols : public VrSigProc { 00030 protected: 00031 int valid_bits, output_bits; 00032 u_char current_data; 00033 public: 00034 VrBits2Symbols(int); 00035 00036 virtual void setOutputBits(int b){ 00037 // bug here -> doesn't deal with state properly 00038 output_bits = b; 00039 current_data = 0x0; 00040 valid_bits =0; 00041 }; 00042 virtual int work(VrSampleRange output, void *o[], VrSampleRange inputs[], void *i[]); 00043 }; 00044 00045 int VrBits2Symbols::work(VrSampleRange output, void *ao[], 00046 VrSampleRange inputs[], void *ai[]) 00047 { 00048 char **i = (char **)ai; 00049 char **o = (char **)ao; 00050 int size = output.size, bits_done; 00051 u_char out; 00052 00053 00054 while(size-- > 0) { 00055 00056 00057 bits_done = 0; 00058 out = 0x00; 00059 00060 while (bits_done < output_bits){ 00061 00062 if (valid_bits == 0) { 00063 00064 current_data = *i[0]++; 00065 // printf("\n %x ", current_data); 00066 valid_bits = 8; 00067 } 00068 00069 out = (out<<1) + (current_data>>7); /* msb from current_data becomes lsb of output */ 00070 current_data = current_data << 1; 00071 valid_bits--; 00072 bits_done++; 00073 } 00074 00075 //printf(" %x ", out); 00076 //if (out > 16) printf("***** Bad result here: size = %d\n", size); 00077 *o[0]++ = out; 00078 } 00079 return output.size; 00080 } 00081 00082 VrBits2Symbols::VrBits2Symbols(int bits) 00083 : VrSigProc(1, sizeof(char), sizeof(char)) 00084 { 00085 output_bits = bits; 00086 valid_bits = 0; 00087 } 00088 00089 00090 #endif 00091 00092 00093 00094 00095 00096 00097

Generated on Wed Aug 4 02:22:05 2004 for GNU Radio by doxygen 1.3.8