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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 #ifndef CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ | 5 #ifndef CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ |
| 6 #define CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ | 6 #define CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ |
| 7 | 7 |
| 8 #include "base/memory/ref_counted.h" | 8 #include "base/memory/ref_counted.h" |
| 9 #include "base/synchronization/lock.h" | 9 #include "base/synchronization/lock.h" |
| 10 #include "base/threading/thread_checker.h" | 10 #include "base/threading/thread_checker.h" |
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| 21 | 21 |
| 22 // WebAudioCapturerSource is the missing link between | 22 // WebAudioCapturerSource is the missing link between |
| 23 // WebAudio's MediaStreamAudioDestinationNode and WebRtcLocalAudioTrack. | 23 // WebAudio's MediaStreamAudioDestinationNode and WebRtcLocalAudioTrack. |
| 24 // | 24 // |
| 25 // 1. WebKit calls the setFormat() method setting up the basic stream format | 25 // 1. WebKit calls the setFormat() method setting up the basic stream format |
| 26 // (channels, and sample-rate). | 26 // (channels, and sample-rate). |
| 27 // 2. consumeAudio() is called periodically by WebKit which dispatches the | 27 // 2. consumeAudio() is called periodically by WebKit which dispatches the |
| 28 // audio stream to the WebRtcLocalAudioTrack::Capture() method. | 28 // audio stream to the WebRtcLocalAudioTrack::Capture() method. |
| 29 class WebAudioCapturerSource | 29 class WebAudioCapturerSource |
| 30 : public base::RefCountedThreadSafe<WebAudioCapturerSource>, | 30 : public base::RefCountedThreadSafe<WebAudioCapturerSource>, |
| 31 public WebKit::WebAudioDestinationConsumer { | 31 public blink::WebAudioDestinationConsumer { |
| 32 public: | 32 public: |
| 33 WebAudioCapturerSource(); | 33 WebAudioCapturerSource(); |
| 34 | 34 |
| 35 // WebAudioDestinationConsumer implementation. | 35 // WebAudioDestinationConsumer implementation. |
| 36 // setFormat() is called early on, so that we can configure the audio track. | 36 // setFormat() is called early on, so that we can configure the audio track. |
| 37 virtual void setFormat(size_t number_of_channels, float sample_rate) OVERRIDE; | 37 virtual void setFormat(size_t number_of_channels, float sample_rate) OVERRIDE; |
| 38 // MediaStreamAudioDestinationNode periodically calls consumeAudio(). | 38 // MediaStreamAudioDestinationNode periodically calls consumeAudio(). |
| 39 // Called on the WebAudio audio thread. | 39 // Called on the WebAudio audio thread. |
| 40 virtual void consumeAudio(const WebKit::WebVector<const float*>& audio_data, | 40 virtual void consumeAudio(const blink::WebVector<const float*>& audio_data, |
| 41 size_t number_of_frames) OVERRIDE; | 41 size_t number_of_frames) OVERRIDE; |
| 42 | 42 |
| 43 // Called when the WebAudioCapturerSource is hooking to a media audio track. | 43 // Called when the WebAudioCapturerSource is hooking to a media audio track. |
| 44 // |track| is the sink of the data flow. |source_provider| is the source of | 44 // |track| is the sink of the data flow. |source_provider| is the source of |
| 45 // the data flow where stream information like delay, volume, key_pressed, | 45 // the data flow where stream information like delay, volume, key_pressed, |
| 46 // is stored. | 46 // is stored. |
| 47 void Start(WebRtcLocalAudioTrack* track, | 47 void Start(WebRtcLocalAudioTrack* track, |
| 48 WebRtcLocalAudioSourceProvider* source_provider); | 48 WebRtcLocalAudioSourceProvider* source_provider); |
| 49 | 49 |
| 50 // Called when the media audio track is stopping. | 50 // Called when the media audio track is stopping. |
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| 82 // Synchronizes HandleCapture() with AudioCapturerSource calls. | 82 // Synchronizes HandleCapture() with AudioCapturerSource calls. |
| 83 base::Lock lock_; | 83 base::Lock lock_; |
| 84 bool started_; | 84 bool started_; |
| 85 | 85 |
| 86 DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource); | 86 DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource); |
| 87 }; | 87 }; |
| 88 | 88 |
| 89 } // namespace content | 89 } // namespace content |
| 90 | 90 |
| 91 #endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ | 91 #endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ |
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