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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). |
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| 33 public: | 33 public: |
| 34 // |close_delay| specifies delay after the stream is idle until the audio | 34 // |close_delay| specifies delay after the stream is idle until the audio |
| 35 // device is closed. | 35 // device is closed. |
| 36 AudioOutputDispatcherImpl(AudioManager* audio_manager, | 36 AudioOutputDispatcherImpl(AudioManager* audio_manager, |
| 37 const AudioParameters& params, | 37 const AudioParameters& params, |
| 38 const std::string& output_device_id, | 38 const std::string& output_device_id, |
| 39 const base::TimeDelta& close_delay); | 39 const base::TimeDelta& close_delay); |
| 40 | 40 |
| 41 // 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 |
| 42 // |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. |
| 43 virtual bool OpenStream() OVERRIDE; | 43 virtual bool OpenStream() override; |
| 44 | 44 |
| 45 // 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 |
| 46 // them, otherwise creates a new one. | 46 // them, otherwise creates a new one. |
| 47 virtual bool StartStream(AudioOutputStream::AudioSourceCallback* callback, | 47 virtual bool StartStream(AudioOutputStream::AudioSourceCallback* callback, |
| 48 AudioOutputProxy* stream_proxy) OVERRIDE; | 48 AudioOutputProxy* stream_proxy) override; |
| 49 | 49 |
| 50 // Stops the stream assigned to the specified proxy and moves it into | 50 // Stops the stream assigned to the specified proxy and moves it into |
| 51 // |idle_streams_| for reuse by other proxies. | 51 // |idle_streams_| for reuse by other proxies. |
| 52 virtual void StopStream(AudioOutputProxy* stream_proxy) OVERRIDE; | 52 virtual void StopStream(AudioOutputProxy* stream_proxy) override; |
| 53 | 53 |
| 54 virtual void StreamVolumeSet(AudioOutputProxy* stream_proxy, | 54 virtual void StreamVolumeSet(AudioOutputProxy* stream_proxy, |
| 55 double volume) OVERRIDE; | 55 double volume) override; |
| 56 | 56 |
| 57 // Closes |idle_streams_| until the number of |idle_streams_| is equal to the | 57 // Closes |idle_streams_| until the number of |idle_streams_| is equal to the |
| 58 // |idle_proxies_| count. If there are no |idle_proxies_| a single stream is | 58 // |idle_proxies_| count. If there are no |idle_proxies_| a single stream is |
| 59 // kept alive until |close_timer_| fires. | 59 // kept alive until |close_timer_| fires. |
| 60 virtual void CloseStream(AudioOutputProxy* stream_proxy) OVERRIDE; | 60 virtual void CloseStream(AudioOutputProxy* stream_proxy) override; |
| 61 | 61 |
| 62 virtual void Shutdown() OVERRIDE; | 62 virtual void Shutdown() override; |
| 63 | 63 |
| 64 private: | 64 private: |
| 65 friend class base::RefCountedThreadSafe<AudioOutputDispatcherImpl>; | 65 friend class base::RefCountedThreadSafe<AudioOutputDispatcherImpl>; |
| 66 virtual ~AudioOutputDispatcherImpl(); | 66 virtual ~AudioOutputDispatcherImpl(); |
| 67 | 67 |
| 68 // Creates a new physical output stream, opens it and pushes to | 68 // Creates a new physical output stream, opens it and pushes to |
| 69 // |idle_streams_|. Returns false if the stream couldn't be created or | 69 // |idle_streams_|. Returns false if the stream couldn't be created or |
| 70 // opened. | 70 // opened. |
| 71 bool CreateAndOpenStream(); | 71 bool CreateAndOpenStream(); |
| 72 | 72 |
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| 90 typedef std::map<AudioOutputStream*, int> AudioStreamIDMap; | 90 typedef std::map<AudioOutputStream*, int> AudioStreamIDMap; |
| 91 AudioStreamIDMap audio_stream_ids_; | 91 AudioStreamIDMap audio_stream_ids_; |
| 92 int audio_stream_id_; | 92 int audio_stream_id_; |
| 93 | 93 |
| 94 DISALLOW_COPY_AND_ASSIGN(AudioOutputDispatcherImpl); | 94 DISALLOW_COPY_AND_ASSIGN(AudioOutputDispatcherImpl); |
| 95 }; | 95 }; |
| 96 | 96 |
| 97 } // namespace media | 97 } // namespace media |
| 98 | 98 |
| 99 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ | 99 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_ |
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