PTLib
Version 2.10.4
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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 * $Revision: 24177 $ 00027 * $Author: rjongbloed $ 00028 * $Date: 2010-04-05 06:52:04 -0500 (Mon, 05 Apr 2010) $ 00029 */ 00030 00031 #ifndef PTLIB_DELAYCHAN_H 00032 #define PTLIB_DELAYCHAN_H 00033 #include <ptlib/contain.h> 00034 #include <ptlib/object.h> 00035 #include <ptlib/timeint.h> 00036 #include <ptlib/ptime.h> 00037 #include <ptlib/indchan.h> 00038 00039 #ifdef P_USE_PRAGMA 00040 #pragma interface 00041 #endif 00042 00043 00052 class PAdaptiveDelay : public PObject 00053 { 00054 PCLASSINFO(PAdaptiveDelay, PObject); 00055 00056 public: 00057 00064 PAdaptiveDelay( 00065 unsigned maximumSlip = 0, 00066 unsigned minimumDelay = 0 00067 ); 00069 00078 void SetMaximumSlip(PTimeInterval maximumSlip) 00079 { jitterLimit = maximumSlip; } 00080 00082 PTimeInterval GetMaximumSlip() const 00083 { return jitterLimit; } 00085 00102 PBoolean Delay(int time); 00103 00107 void Restart(); 00109 00110 protected: 00111 PBoolean firstTime; 00112 PTime targetTime; 00113 00114 PTimeInterval jitterLimit; 00115 PTimeInterval minimumDelay; 00116 }; 00117 00118 00134 class PDelayChannel : public PIndirectChannel 00135 { 00136 PCLASSINFO(PDelayChannel, PIndirectChannel); 00137 public: 00140 enum Mode { 00141 DelayReadsOnly, 00142 DelayWritesOnly, 00143 DelayReadsAndWrites 00144 }; 00145 00153 PDelayChannel( 00154 Mode mode, 00155 unsigned frameDelay, 00156 PINDEX frameSize = 0, 00157 unsigned maximumSlip = 250, 00158 unsigned minimumDelay = 10 00159 ); 00160 00168 PDelayChannel( 00169 PChannel &channel, 00170 Mode mode, 00171 unsigned frameDelay, 00172 PINDEX frameSize = 0, 00173 unsigned maximumSlip = 250, 00174 unsigned minimumDelay = 10 00175 ); 00177 00178 00192 virtual PBoolean Read( 00193 void * buf, 00194 PINDEX len 00195 ); 00196 00206 virtual PBoolean Write( 00207 const void * buf, 00208 PINDEX len 00209 ); 00211 00212 00213 protected: 00214 virtual void Wait(PINDEX count, PTimeInterval & nextTick); 00215 00216 Mode mode; 00217 unsigned frameDelay; 00218 PINDEX frameSize; 00219 PTimeInterval maximumSlip; 00220 PTimeInterval minimumDelay; 00221 00222 PTimeInterval nextReadTick; 00223 PTimeInterval nextWriteTick; 00224 }; 00225 00226 00227 #endif // PTLIB_DELAYCHAN_H 00228 00229 00230 // End Of File ///////////////////////////////////////////////////////////////