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Side by Side Diff: webrtc/sound/automaticallychosensoundsystem.h

Issue 1715043002: Remove webrtc/sound/ subdir. (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@remove_devicemanager
Patch Set: rebase Created 4 years, 9 months ago
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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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