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_NULLSOUNDSYSTEM_H_ 29 #define TALK_SOUND_NULLSOUNDSYSTEM_H_ 30 31 #include "talk/sound/soundsysteminterface.h" 32 33 namespace cricket { 34 35 class SoundDeviceLocator; 36 class SoundInputStreamInterface; 37 class SoundOutputStreamInterface; 38 39 // A simple reference sound system that drops output samples and generates 40 // no input samples. 41 class NullSoundSystem : public SoundSystemInterface { 42 public: Create()43 static SoundSystemInterface *Create() { 44 return new NullSoundSystem(); 45 } 46 47 virtual ~NullSoundSystem(); 48 49 virtual bool Init(); 50 virtual void Terminate(); 51 52 virtual bool EnumeratePlaybackDevices(SoundDeviceLocatorList *devices); 53 virtual bool EnumerateCaptureDevices(SoundDeviceLocatorList *devices); 54 55 virtual SoundOutputStreamInterface *OpenPlaybackDevice( 56 const SoundDeviceLocator *device, 57 const OpenParams ¶ms); 58 virtual SoundInputStreamInterface *OpenCaptureDevice( 59 const SoundDeviceLocator *device, 60 const OpenParams ¶ms); 61 62 virtual bool GetDefaultPlaybackDevice(SoundDeviceLocator **device); 63 virtual bool GetDefaultCaptureDevice(SoundDeviceLocator **device); 64 65 virtual const char *GetName() const; 66 }; 67 68 } // namespace cricket 69 70 #endif // TALK_SOUND_NULLSOUNDSYSTEM_H_ 71