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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // AudioOutputDispatcherImpl is an implementation of AudioOutputDispatcher. | 5 // AudioOutputDispatcherImpl is an implementation of AudioOutputDispatcher. |
6 // | 6 // |
7 // To avoid opening and closing audio devices more frequently than necessary, | 7 // To avoid opening and closing audio devices more frequently than necessary, |
8 // each dispatcher has a pool of inactive physical streams. A stream is closed | 8 // each dispatcher has a pool of inactive physical streams. A stream is closed |
9 // only if it hasn't been used for a certain period of time (specified via the | 9 // only if it hasn't been used for a certain period of time (specified via the |
10 // constructor). | 10 // constructor). |
11 // | 11 // |
12 | 12 |
13 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ | 13 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ |
14 #define MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ | 14 #define MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ |
15 | 15 |
16 #include <list> | |
17 #include <map> | 16 #include <map> |
17 #include <vector> | |
18 | 18 |
19 #include "base/basictypes.h" | 19 #include "base/basictypes.h" |
20 #include "base/memory/ref_counted.h" | 20 #include "base/memory/ref_counted.h" |
21 #include "base/memory/weak_ptr.h" | |
22 #include "base/timer/timer.h" | 21 #include "base/timer/timer.h" |
23 #include "media/audio/audio_io.h" | 22 #include "media/audio/audio_io.h" |
24 #include "media/audio/audio_manager.h" | 23 #include "media/audio/audio_manager.h" |
25 #include "media/audio/audio_output_dispatcher.h" | 24 #include "media/audio/audio_output_dispatcher.h" |
26 #include "media/audio/audio_parameters.h" | 25 #include "media/audio/audio_parameters.h" |
27 | 26 |
28 namespace media { | 27 namespace media { |
29 | 28 |
30 class AudioOutputProxy; | 29 class AudioOutputProxy; |
31 | 30 |
32 class MEDIA_EXPORT AudioOutputDispatcherImpl : public AudioOutputDispatcher { | 31 class MEDIA_EXPORT AudioOutputDispatcherImpl : public AudioOutputDispatcher { |
33 public: | 32 public: |
34 // |close_delay_ms| specifies delay after the stream is paused until | 33 // |close_delay| specifies delay after the stream is idle until the audio |
35 // the audio device is closed. | 34 // device is closed. |
36 AudioOutputDispatcherImpl(AudioManager* audio_manager, | 35 AudioOutputDispatcherImpl(AudioManager* audio_manager, |
37 const AudioParameters& params, | 36 const AudioParameters& params, |
38 const std::string& output_device_id, | 37 const std::string& output_device_id, |
39 const std::string& input_device_id, | 38 const std::string& input_device_id, |
40 const base::TimeDelta& close_delay); | 39 const base::TimeDelta& close_delay); |
41 | 40 |
42 // Opens a new physical stream if there are no pending streams in | 41 // Opens a new physical stream if there are no pending streams in |
43 // |idle_streams_|. Do not call Close() or Stop() if this method fails. | 42 // |idle_streams_|. Do not call Close() or Stop() if this method fails. |
44 virtual bool OpenStream() OVERRIDE; | 43 virtual bool OpenStream() OVERRIDE; |
45 | 44 |
46 // If there are pending streams in |idle_streams_| then it reuses one of | 45 // If there are pending streams in |idle_streams_| then it reuses one of |
47 // them, otherwise creates a new one. | 46 // them, otherwise creates a new one. |
48 virtual bool StartStream(AudioOutputStream::AudioSourceCallback* callback, | 47 virtual bool StartStream(AudioOutputStream::AudioSourceCallback* callback, |
49 AudioOutputProxy* stream_proxy) OVERRIDE; | 48 AudioOutputProxy* stream_proxy) OVERRIDE; |
50 | 49 |
51 // Holds the physical stream temporarily in |pausing_streams_| and then | 50 // Holds the physical stream temporarily in |pausing_streams_| and then |
52 // |stream| is added to the pool of pending streams (i.e. |idle_streams_|). | 51 // |stream| is added to the pool of pending streams (i.e. |idle_streams_|). |
53 virtual void StopStream(AudioOutputProxy* stream_proxy) OVERRIDE; | 52 virtual void StopStream(AudioOutputProxy* stream_proxy) OVERRIDE; |
54 | 53 |
55 virtual void StreamVolumeSet(AudioOutputProxy* stream_proxy, | 54 virtual void StreamVolumeSet(AudioOutputProxy* stream_proxy, |
56 double volume) OVERRIDE; | 55 double volume) OVERRIDE; |
57 | 56 |
58 virtual void CloseStream(AudioOutputProxy* stream_proxy) OVERRIDE; | 57 virtual void CloseStream(AudioOutputProxy* stream_proxy) OVERRIDE; |
59 | 58 |
60 virtual void Shutdown() OVERRIDE; | 59 virtual void Shutdown() OVERRIDE; |
61 | 60 |
62 private: | 61 private: |
63 typedef std::map<AudioOutputProxy*, AudioOutputStream*> AudioStreamMap; | |
64 friend class base::RefCountedThreadSafe<AudioOutputDispatcherImpl>; | 62 friend class base::RefCountedThreadSafe<AudioOutputDispatcherImpl>; |
65 virtual ~AudioOutputDispatcherImpl(); | 63 virtual ~AudioOutputDispatcherImpl(); |
66 | 64 |
67 friend class AudioOutputProxyTest; | |
68 | |
69 // Creates a new physical output stream, opens it and pushes to | 65 // Creates a new physical output stream, opens it and pushes to |
70 // |idle_streams_|. Returns false if the stream couldn't be created or | 66 // |idle_streams_|. Returns false if the stream couldn't be created or |
71 // opened. | 67 // opened. |
72 bool CreateAndOpenStream(); | 68 bool CreateAndOpenStream(); |
73 | 69 |
74 // A task scheduled by StartStream(). Opens a new stream and puts | 70 // Closes all |idle_streams_|. |
75 // it in |idle_streams_|. | 71 void CloseIdleStreams(); |
76 void OpenTask(); | |
77 | 72 |
78 // Before a stream is reused, it should sit idle for a bit. This task is | 73 size_t idle_proxies_; |
79 // called once that time has elapsed. | 74 typedef std::vector<AudioOutputStream*> AudioOutputStreamList; |
80 void StopStreamTask(); | |
81 | |
82 // Called by |close_timer_|. Closes all pending streams. | |
83 void ClosePendingStreams(); | |
84 | |
85 base::TimeDelta pause_delay_; | |
86 size_t paused_proxies_; | |
87 typedef std::list<AudioOutputStream*> AudioOutputStreamList; | |
88 AudioOutputStreamList idle_streams_; | 75 AudioOutputStreamList idle_streams_; |
89 AudioOutputStreamList pausing_streams_; | |
90 | 76 |
91 // Used to post delayed tasks to ourselves that we cancel inside Shutdown(). | 77 // Used to post delayed tasks to ourselves that we cancel inside Shutdown(). |
scherkus (not reviewing)
2013/10/18 00:01:19
was this comment referring to weak_this_ or close_
DaleCurtis
2013/10/18 00:08:00
Done.
| |
92 base::WeakPtrFactory<AudioOutputDispatcherImpl> weak_this_; | |
93 base::DelayTimer<AudioOutputDispatcherImpl> close_timer_; | 78 base::DelayTimer<AudioOutputDispatcherImpl> close_timer_; |
94 | 79 |
80 typedef std::map<AudioOutputProxy*, AudioOutputStream*> AudioStreamMap; | |
95 AudioStreamMap proxy_to_physical_map_; | 81 AudioStreamMap proxy_to_physical_map_; |
96 | 82 |
97 DISALLOW_COPY_AND_ASSIGN(AudioOutputDispatcherImpl); | 83 DISALLOW_COPY_AND_ASSIGN(AudioOutputDispatcherImpl); |
98 }; | 84 }; |
99 | 85 |
100 } // namespace media | 86 } // namespace media |
101 | 87 |
102 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ | 88 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ |
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