common/JackTimedDriver.h

   1 /*
   2 Copyright (C) 2001 Paul Davis
   3 Copyright (C) 2004-2008 Grame
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #ifndef __JackTimedDriver__
  22 #define __JackTimedDriver__
  23
  24 #include "JackAudioDriver.h"
  25
  26 namespace Jack
  27 {
  28
  29 /*!
  30 \brief The timed driver.
  31 */
  32
  33 class SERVER_EXPORT JackTimedDriver : public JackAudioDriver
  34 {
  35     protected:
  36
  37         int fCycleCount;
  38         jack_time_t fAnchorTimeUsec;
  39
  40         int FirstCycle(jack_time_t cur_time);
  41         int CurrentCycle(jack_time_t cur_time);
  42
  43         void ProcessWait();
  44
  45     public:
  46
  47         JackTimedDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
  48                 : JackAudioDriver(name, alias, engine, table), fCycleCount(0), fAnchorTimeUsec(0)
  49         {}
  50         virtual ~JackTimedDriver()
  51         {}
  52
  53         // BufferSize can be changed
  54         bool IsFixedBufferSize()
  55         {
  56             return false;
  57         }
  58
  59         int Start();
  60
  61 };
  62
  63 class SERVER_EXPORT JackWaiterDriver : public JackTimedDriver
  64 {
  65
  66     public:
  67
  68         JackWaiterDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
  69             : JackTimedDriver(name, alias, engine, table)
  70         {}
  71         virtual ~JackWaiterDriver()
  72         {}
  73
  74         virtual int ProcessNull();
  75
  76 };
  77
  78 /*!
  79 \brief A restartable driver.
  80
  81 When wrapped into a JackWaitCallbackDriver, this driver can restart the
  82 wrapper thread which will wait again for the Initialize method to return.
  83 */
  84 class SERVER_EXPORT JackRestarterDriver : public JackWaiterDriver
  85 {
  86
  87     private:
  88
  89         JackDriver* fRestartDriver; /*!< The wrapper driver */
  90
  91     public:
  92
  93         JackRestarterDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
  94             : JackWaiterDriver(name, alias, engine, table), fRestartDriver(NULL)
  95         {}
  96         virtual ~JackRestarterDriver()
  97         {}
  98
  99         void SetRestartDriver(JackDriver* driver); /*!< Let the wrapper register itself */
 100         int RestartWait(); /*!< Restart the wrapper thread */
 101
 102 };
 103
 104 } // end of namespace
 105
 106 #endif