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      1 /*
      2  * libjingle
      3  * Copyright 2004--2010, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_SOUND_SOUNDSYSTEMPROXY_H_
     29 #define TALK_SOUND_SOUNDSYSTEMPROXY_H_
     30 
     31 #include "talk/base/basictypes.h"  // for NULL
     32 #include "talk/sound/soundsysteminterface.h"
     33 
     34 namespace cricket {
     35 
     36 // A SoundSystemProxy is a sound system that defers to another one.
     37 // Init(), Terminate(), and GetName() are left as pure virtual, so a sub-class
     38 // must define them.
     39 class SoundSystemProxy : public SoundSystemInterface {
     40  public:
     41   SoundSystemProxy() : wrapped_(NULL) {}
     42 
     43   // Each of these methods simply defers to wrapped_ if non-NULL, else fails.
     44 
     45   virtual bool EnumeratePlaybackDevices(SoundDeviceLocatorList *devices);
     46   virtual bool EnumerateCaptureDevices(SoundDeviceLocatorList *devices);
     47 
     48   virtual bool GetDefaultPlaybackDevice(SoundDeviceLocator **device);
     49   virtual bool GetDefaultCaptureDevice(SoundDeviceLocator **device);
     50 
     51   virtual SoundOutputStreamInterface *OpenPlaybackDevice(
     52       const SoundDeviceLocator *device,
     53       const OpenParams &params);
     54   virtual SoundInputStreamInterface *OpenCaptureDevice(
     55       const SoundDeviceLocator *device,
     56       const OpenParams &params);
     57 
     58  protected:
     59   SoundSystemInterface *wrapped_;
     60 };
     61 
     62 }  // namespace cricket
     63 
     64 #endif  // TALK_SOUND_SOUNDSYSTEMPROXY_H_
     65