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