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| 1 /* | |
| 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #ifndef WEBRTC_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_ | |
| 12 #define WEBRTC_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_ | |
| 13 | |
| 14 #include "webrtc/sound/soundsysteminterface.h" | |
| 15 #include "webrtc/sound/soundsystemproxy.h" | |
| 16 #include "webrtc/base/common.h" | |
| 17 #include "webrtc/base/logging.h" | |
| 18 #include "webrtc/base/scoped_ptr.h" | |
| 19 | |
| 20 namespace rtc { | |
| 21 | |
| 22 // A function type that creates an instance of a sound system implementation. | |
| 23 typedef SoundSystemInterface *(*SoundSystemCreator)(); | |
| 24 | |
| 25 // An AutomaticallyChosenSoundSystem is a sound system proxy that defers to | |
| 26 // an instance of the first sound system implementation in a list that | |
| 27 // successfully initializes. | |
| 28 template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems> | |
| 29 class AutomaticallyChosenSoundSystem : public SoundSystemProxy { | |
| 30 public: | |
| 31 // Chooses and initializes the underlying sound system. | |
| 32 virtual bool Init(); | |
| 33 // Terminates the underlying sound system implementation, but caches it for | |
| 34 // future re-use. | |
| 35 virtual void Terminate(); | |
| 36 | |
| 37 virtual const char *GetName() const; | |
| 38 | |
| 39 private: | |
| 40 rtc::scoped_ptr<SoundSystemInterface> sound_systems_[kNumSoundSystems]; | |
| 41 }; | |
| 42 | |
| 43 template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems> | |
| 44 bool AutomaticallyChosenSoundSystem<kSoundSystemCreators, | |
| 45 kNumSoundSystems>::Init() { | |
| 46 if (wrapped_) { | |
| 47 return true; | |
| 48 } | |
| 49 for (int i = 0; i < kNumSoundSystems; ++i) { | |
| 50 if (!sound_systems_[i].get()) { | |
| 51 sound_systems_[i].reset((*kSoundSystemCreators[i])()); | |
| 52 } | |
| 53 if (sound_systems_[i]->Init()) { | |
| 54 // This is the first sound system in the list to successfully | |
| 55 // initialize, so we're done. | |
| 56 wrapped_ = sound_systems_[i].get(); | |
| 57 break; | |
| 58 } | |
| 59 // Else it failed to initialize, so try the remaining ones. | |
| 60 } | |
| 61 if (!wrapped_) { | |
| 62 LOG(LS_ERROR) << "Failed to find a usable sound system"; | |
| 63 return false; | |
| 64 } | |
| 65 LOG(LS_INFO) << "Selected " << wrapped_->GetName() << " sound system"; | |
| 66 return true; | |
| 67 } | |
| 68 | |
| 69 template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems> | |
| 70 void AutomaticallyChosenSoundSystem<kSoundSystemCreators, | |
| 71 kNumSoundSystems>::Terminate() { | |
| 72 if (!wrapped_) { | |
| 73 return; | |
| 74 } | |
| 75 wrapped_->Terminate(); | |
| 76 wrapped_ = NULL; | |
| 77 // We do not free the scoped_ptrs because we may be re-init'ed soon. | |
| 78 } | |
| 79 | |
| 80 template <const SoundSystemCreator kSoundSystemCreators[], int kNumSoundSystems> | |
| 81 const char *AutomaticallyChosenSoundSystem<kSoundSystemCreators, | |
| 82 kNumSoundSystems>::GetName() const { | |
| 83 return wrapped_ ? wrapped_->GetName() : "automatic"; | |
| 84 } | |
| 85 | |
| 86 } // namespace rtc | |
| 87 | |
| 88 #endif // WEBRTC_SOUND_AUTOMATICALLYCHOSENSOUNDSYSTEM_H_ | |
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