OLD | NEW |
| (Empty) |
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_ | |
OLD | NEW |