28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
106 lines
4.1 KiB
C++
106 lines
4.1 KiB
C++
/*
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* libjingle
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* Copyright 2004--2010, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_
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#define TALK_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_
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#include "talk/base/common.h"
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#include "talk/base/logging.h"
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#include "talk/base/scoped_ptr.h"
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#include "talk/sound/soundsysteminterface.h"
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#include "talk/sound/soundsystemproxy.h"
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namespace cricket {
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// A function type that creates an instance of a sound system implementation.
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typedef SoundSystemInterface *(*SoundSystemCreator)();
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// An AutomaticallyChosenSoundSystem is a sound system proxy that defers to
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// an instance of the first sound system implementation in a list that
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// successfully initializes.
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template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems>
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class AutomaticallyChosenSoundSystem : public SoundSystemProxy {
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public:
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// Chooses and initializes the underlying sound system.
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virtual bool Init();
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// Terminates the underlying sound system implementation, but caches it for
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// future re-use.
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virtual void Terminate();
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virtual const char *GetName() const;
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private:
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talk_base::scoped_ptr<SoundSystemInterface> sound_systems_[kNumSoundSystems];
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};
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template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems>
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bool AutomaticallyChosenSoundSystem<kSoundSystemCreators,
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kNumSoundSystems>::Init() {
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if (wrapped_) {
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return true;
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}
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for (int i = 0; i < kNumSoundSystems; ++i) {
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if (!sound_systems_[i].get()) {
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sound_systems_[i].reset((*kSoundSystemCreators[i])());
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}
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if (sound_systems_[i]->Init()) {
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// This is the first sound system in the list to successfully
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// initialize, so we're done.
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wrapped_ = sound_systems_[i].get();
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break;
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}
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// Else it failed to initialize, so try the remaining ones.
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}
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if (!wrapped_) {
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LOG(LS_ERROR) << "Failed to find a usable sound system";
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return false;
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}
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LOG(LS_INFO) << "Selected " << wrapped_->GetName() << " sound system";
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return true;
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}
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template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems>
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void AutomaticallyChosenSoundSystem<kSoundSystemCreators,
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kNumSoundSystems>::Terminate() {
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if (!wrapped_) {
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return;
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}
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wrapped_->Terminate();
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wrapped_ = NULL;
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// We do not free the scoped_ptrs because we may be re-init'ed soon.
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}
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template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems>
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const char *AutomaticallyChosenSoundSystem<kSoundSystemCreators,
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kNumSoundSystems>::GetName() const {
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return wrapped_ ? wrapped_->GetName() : "automatic";
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}
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} // namespace cricket
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#endif // TALK_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_
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