/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_
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#define WEBRTC_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_
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#include "webrtc/sound/soundsysteminterface.h"
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#include "webrtc/sound/soundsystemproxy.h"
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#include "webrtc/base/common.h"
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#include "webrtc/base/logging.h"
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#include "webrtc/base/scoped_ptr.h"
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namespace rtc {
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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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rtc::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 rtc
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#endif // WEBRTC_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_
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