PWLib
1.10.10
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00001 /* 00002 * delaychan.h 00003 * 00004 * Class for implementing a serial queue channel in memory. 00005 * 00006 * Portable Windows Library 00007 * 00008 * Copyright (c) 2001 Equivalence Pty. Ltd. 00009 * 00010 * The contents of this file are subject to the Mozilla Public License 00011 * Version 1.0 (the "License"); you may not use this file except in 00012 * compliance with the License. You may obtain a copy of the License at 00013 * http://www.mozilla.org/MPL/ 00014 * 00015 * Software distributed under the License is distributed on an "AS IS" 00016 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 00017 * the License for the specific language governing rights and limitations 00018 * under the License. 00019 * 00020 * The Original Code is Portable Windows Library. 00021 * 00022 * The Initial Developer of the Original Code is Equivalence Pty. Ltd. 00023 * 00024 * Contributor(s): ______________________________________. 00025 * 00026 * $Log: delaychan.h,v $ 00027 * Revision 1.6 2005/11/30 12:47:37 csoutheren 00028 * Removed tabs, reformatted some code, and changed tags for Doxygen 00029 * 00030 * Revision 1.5 2004/11/11 07:34:50 csoutheren 00031 * Added #include <ptlib.h> 00032 * 00033 * Revision 1.4 2002/09/16 01:08:59 robertj 00034 * Added #define so can select if #pragma interface/implementation is used on 00035 * platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan. 00036 * 00037 * Revision 1.3 2002/02/25 11:05:02 rogerh 00038 * New Delay code which solves the accumulated error problem. Based on ideas 00039 * by Tomasz Motylewski <T.Motylewski@bfad.de>, Roger and Craig. 00040 * 00041 * Revision 1.2 2002/01/15 03:55:43 craigs 00042 * Added PAdaptiveDelay class 00043 * 00044 * Revision 1.1 2001/07/10 03:07:07 robertj 00045 * Added queue channel and delay channel classes to ptclib. 00046 * 00047 */ 00048 00049 #ifndef _DELAYCHAN_H 00050 #define _DELAYCHAN_H 00051 00052 00053 #ifdef P_USE_PRAGMA 00054 #pragma interface 00055 #endif 00056 00057 #include <ptlib.h> 00058 00067 class PAdaptiveDelay : public PObject 00068 { 00069 PCLASSINFO(PAdaptiveDelay, PObject); 00070 00071 public: 00072 PAdaptiveDelay(); 00073 BOOL Delay(int time); 00074 void Restart(); 00075 00076 protected: 00077 BOOL firstTime; 00078 PTime targetTime; 00079 }; 00080 00081 00097 class PDelayChannel : public PIndirectChannel 00098 { 00099 PCLASSINFO(PDelayChannel, PIndirectChannel); 00100 public: 00103 enum Mode { 00104 DelayReadsOnly, 00105 DelayWritesOnly, 00106 DelayReadsAndWrites 00107 }; 00108 00116 PDelayChannel( 00117 Mode mode, 00118 unsigned frameDelay, 00119 PINDEX frameSize = 0, 00120 unsigned maximumSlip = 250, 00121 unsigned minimumDelay = 10 00122 ); 00124 00125 00139 virtual BOOL Read( 00140 void * buf, 00141 PINDEX len 00142 ); 00143 00153 virtual BOOL Write( 00154 const void * buf, 00155 PINDEX len 00156 ); 00158 00159 00160 protected: 00161 virtual void Wait(PINDEX count, PTimeInterval & nextTick); 00162 00163 Mode mode; 00164 unsigned frameDelay; 00165 PINDEX frameSize; 00166 PTimeInterval maximumSlip; 00167 PTimeInterval minimumDelay; 00168 00169 PTimeInterval nextReadTick; 00170 PTimeInterval nextWriteTick; 00171 }; 00172 00173 00174 #endif // _DELAYCHAN_H 00175 00176 00177 // End Of File ///////////////////////////////////////////////////////////////