DeviceManager.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  DeviceManager.h
 
  Created by Michael Chinen (mchinen) on 2/12/11
  Audacity(R) is copyright (c) 1999-2011 Audacity Team.
  License: GPL v2 or later.  See License.txt.
 
******************************************************************//*******************************************************************/
 
#ifndef __AUDACITY_DEVICEMANAGER__
#define __AUDACITY_DEVICEMANAGER__
 
#include <chrono>
#include <vector>
 
#include <wx/string.h> // member variables
 
#include "DeviceChange.h"
 
typedef struct DeviceSourceMap {
   int deviceIndex;
   int sourceIndex;
   int hostIndex;
   int totalSources;
   int numChannels;
   wxString sourceString;
   wxString deviceString;
   wxString hostString;
} DeviceSourceMap;
 
AUDIO_DEVICES_API
wxString MakeDeviceSourceString(const DeviceSourceMap *map);
 
class AUDIO_DEVICES_API DeviceManager final
#if defined(EXPERIMENTAL_DEVICE_CHANGE_HANDLER) && defined(HAVE_DEVICE_CHANGE)
: public DeviceChangeHandler
#else
: public DeviceChangeMessagePublisher
#endif
{
 public:
   static DeviceManager* Instance();
 
   void Rescan();
 
   // Time since devices scanned in seconds.
   std::chrono::duration<float> GetTimeSinceRescan();
 
   DeviceSourceMap* GetDefaultOutputDevice(int hostIndex);
   DeviceSourceMap* GetDefaultInputDevice(int hostIndex);
 
   const std::vector<DeviceSourceMap> &GetInputDeviceMaps();
   const std::vector<DeviceSourceMap> &GetOutputDeviceMaps();
 
#if defined(EXPERIMENTAL_DEVICE_CHANGE_HANDLER)
#if defined(HAVE_DEVICE_CHANGE)
   // DeviceChangeHandler implementation
   void DeviceChangeNotification();
#endif
#endif
 
private:
   std::chrono::time_point<std::chrono::steady_clock> mRescanTime;
 
 protected:
   //private constructor - Singleton.
   DeviceManager();
   ~DeviceManager();
   void Init();
 
   DeviceSourceMap* GetDefaultDevice(int hostIndex, int isInput);
 
   bool m_inited;
 
   std::vector<DeviceSourceMap> mInputDeviceSourceMaps;
   std::vector<DeviceSourceMap> mOutputDeviceSourceMaps;
 
   static DeviceManager dm;
};
 
#endif