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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_ | 5 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_ |
6 #define MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_ | 6 #define MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
9 #include "base/compiler_specific.h" | 9 #include "base/compiler_specific.h" |
10 #include "base/memory/ref_counted.h" | 10 #include "base/memory/ref_counted.h" |
| 11 #include "base/threading/non_thread_safe.h" |
11 #include "media/audio/audio_io.h" | 12 #include "media/audio/audio_io.h" |
12 #include "media/audio/audio_parameters.h" | 13 #include "media/audio/audio_parameters.h" |
13 | 14 |
14 class AudioOutputDispatcher; | 15 class AudioOutputDispatcher; |
15 | 16 |
16 // AudioOutputProxy is an audio otput stream that uses resources more | 17 // AudioOutputProxy is an audio otput stream that uses resources more |
17 // efficiently than a regular audio output stream: it opens audio | 18 // efficiently than a regular audio output stream: it opens audio |
18 // device only when sound is playing, i.e. between Start() and Stop() | 19 // device only when sound is playing, i.e. between Start() and Stop() |
19 // (there is still one physical stream per each audio output proxy in | 20 // (there is still one physical stream per each audio output proxy in |
20 // playing state). | 21 // playing state). |
21 // | 22 // |
22 // AudioOutputProxy uses AudioOutputDispatcher to open and close | 23 // AudioOutputProxy uses AudioOutputDispatcher to open and close |
23 // physical output streams. | 24 // physical output streams. |
24 class MEDIA_EXPORT AudioOutputProxy : public AudioOutputStream { | 25 class MEDIA_EXPORT AudioOutputProxy |
| 26 : public AudioOutputStream, |
| 27 public NON_EXPORTED_BASE(base::NonThreadSafe) { |
25 public: | 28 public: |
26 // Caller keeps ownership of |dispatcher|. | 29 // Caller keeps ownership of |dispatcher|. |
27 explicit AudioOutputProxy(AudioOutputDispatcher* dispatcher); | 30 explicit AudioOutputProxy(AudioOutputDispatcher* dispatcher); |
28 | 31 |
29 // AudioOutputStream interface. | 32 // AudioOutputStream interface. |
30 virtual bool Open() OVERRIDE; | 33 virtual bool Open() OVERRIDE; |
31 virtual void Start(AudioSourceCallback* callback) OVERRIDE; | 34 virtual void Start(AudioSourceCallback* callback) OVERRIDE; |
32 virtual void Stop() OVERRIDE; | 35 virtual void Stop() OVERRIDE; |
33 virtual void SetVolume(double volume) OVERRIDE; | 36 virtual void SetVolume(double volume) OVERRIDE; |
34 virtual void GetVolume(double* volume) OVERRIDE; | 37 virtual void GetVolume(double* volume) OVERRIDE; |
(...skipping 18 matching lines...) Expand all Loading... |
53 AudioOutputStream* physical_stream_; | 56 AudioOutputStream* physical_stream_; |
54 | 57 |
55 // Need to save volume here, so that we can restore it in case the stream | 58 // Need to save volume here, so that we can restore it in case the stream |
56 // is stopped, and then started again. | 59 // is stopped, and then started again. |
57 double volume_; | 60 double volume_; |
58 | 61 |
59 DISALLOW_COPY_AND_ASSIGN(AudioOutputProxy); | 62 DISALLOW_COPY_AND_ASSIGN(AudioOutputProxy); |
60 }; | 63 }; |
61 | 64 |
62 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_ | 65 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_ |
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