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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" |
11 #include "media/audio/audio_parameters.h" | 11 #include "media/audio/audio_parameters.h" |
12 #include "media/base/audio_capturer_source.h" | 12 #include "media/base/audio_capturer_source.h" |
13 #include "media/base/audio_fifo.h" | 13 #include "media/base/audio_fifo.h" |
14 #include "third_party/WebKit/public/platform/WebAudioDestinationConsumer.h" | 14 #include "third_party/WebKit/public/platform/WebAudioDestinationConsumer.h" |
| 15 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h" |
15 #include "third_party/WebKit/public/platform/WebVector.h" | 16 #include "third_party/WebKit/public/platform/WebVector.h" |
16 | 17 |
17 namespace content { | 18 namespace content { |
18 | 19 |
19 class WebRtcLocalAudioTrack; | 20 class WebRtcLocalAudioTrack; |
20 | 21 |
21 // WebAudioCapturerSource is the missing link between | 22 // WebAudioCapturerSource is the missing link between |
22 // WebAudio's MediaStreamAudioDestinationNode and WebRtcLocalAudioTrack. | 23 // WebAudio's MediaStreamAudioDestinationNode and WebRtcLocalAudioTrack. |
23 // | 24 // |
24 // 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 |
25 // (channels, and sample-rate). | 26 // (channels, and sample-rate). |
26 // 2. consumeAudio() is called periodically by WebKit which dispatches the | 27 // 2. consumeAudio() is called periodically by WebKit which dispatches the |
27 // audio stream to the WebRtcLocalAudioTrack::Capture() method. | 28 // audio stream to the WebRtcLocalAudioTrack::Capture() method. |
28 class WebAudioCapturerSource | 29 class WebAudioCapturerSource |
29 : public base::RefCountedThreadSafe<WebAudioCapturerSource>, | 30 : public base::RefCountedThreadSafe<WebAudioCapturerSource>, |
30 public blink::WebAudioDestinationConsumer { | 31 public blink::WebAudioDestinationConsumer { |
31 public: | 32 public: |
32 WebAudioCapturerSource(); | 33 explicit WebAudioCapturerSource( |
| 34 const blink::WebMediaStreamSource& blink_source); |
33 | 35 |
34 // WebAudioDestinationConsumer implementation. | 36 // WebAudioDestinationConsumer implementation. |
35 // setFormat() is called early on, so that we can configure the audio track. | 37 // setFormat() is called early on, so that we can configure the audio track. |
36 virtual void setFormat(size_t number_of_channels, float sample_rate) override; | 38 virtual void setFormat(size_t number_of_channels, float sample_rate) override; |
37 // MediaStreamAudioDestinationNode periodically calls consumeAudio(). | 39 // MediaStreamAudioDestinationNode periodically calls consumeAudio(). |
38 // Called on the WebAudio audio thread. | 40 // Called on the WebAudio audio thread. |
39 virtual void consumeAudio(const blink::WebVector<const float*>& audio_data, | 41 virtual void consumeAudio(const blink::WebVector<const float*>& audio_data, |
40 size_t number_of_frames) override; | 42 size_t number_of_frames) override; |
41 | 43 |
42 // Called when the WebAudioCapturerSource is hooking to a media audio track. | 44 // Called when the WebAudioCapturerSource is hooking to a media audio track. |
43 // |track| is the sink of the data flow. |source_provider| is the source of | 45 // |track| is the sink of the data flow. |source_provider| is the source of |
44 // the data flow where stream information like delay, volume, key_pressed, | 46 // the data flow where stream information like delay, volume, key_pressed, |
45 // is stored. | 47 // is stored. |
46 void Start(WebRtcLocalAudioTrack* track); | 48 void Start(WebRtcLocalAudioTrack* track); |
47 | 49 |
48 // Called when the media audio track is stopping. | 50 // Called when the media audio track is stopping. |
49 void Stop(); | 51 void Stop(); |
50 | 52 |
51 protected: | 53 protected: |
52 friend class base::RefCountedThreadSafe<WebAudioCapturerSource>; | 54 friend class base::RefCountedThreadSafe<WebAudioCapturerSource>; |
53 virtual ~WebAudioCapturerSource(); | 55 virtual ~WebAudioCapturerSource(); |
54 | 56 |
55 private: | 57 private: |
| 58 // Removes this object from a blink::WebMediaStreamSource with which it |
| 59 // might be registered. The goal is to avoid dangling pointers. |
| 60 void removeFromBlinkSource(); |
| 61 |
56 // Used to DCHECK that some methods are called on the correct thread. | 62 // Used to DCHECK that some methods are called on the correct thread. |
57 base::ThreadChecker thread_checker_; | 63 base::ThreadChecker thread_checker_; |
58 | 64 |
59 // The audio track this WebAudioCapturerSource is feeding data to. | 65 // The audio track this WebAudioCapturerSource is feeding data to. |
60 // WebRtcLocalAudioTrack is reference counted, and owning this object. | 66 // WebRtcLocalAudioTrack is reference counted, and owning this object. |
61 // To avoid circular reference, a raw pointer is kept here. | 67 // To avoid circular reference, a raw pointer is kept here. |
62 WebRtcLocalAudioTrack* track_; | 68 WebRtcLocalAudioTrack* track_; |
63 | 69 |
64 media::AudioParameters params_; | 70 media::AudioParameters params_; |
65 | 71 |
66 // Flag to help notify the |track_| when the audio format has changed. | 72 // Flag to help notify the |track_| when the audio format has changed. |
67 bool audio_format_changed_; | 73 bool audio_format_changed_; |
68 | 74 |
69 // Wraps data coming from HandleCapture(). | 75 // Wraps data coming from HandleCapture(). |
70 scoped_ptr<media::AudioBus> wrapper_bus_; | 76 scoped_ptr<media::AudioBus> wrapper_bus_; |
71 | 77 |
72 // Bus for reading from FIFO and calling the CaptureCallback. | 78 // Bus for reading from FIFO and calling the CaptureCallback. |
73 scoped_ptr<media::AudioBus> capture_bus_; | 79 scoped_ptr<media::AudioBus> capture_bus_; |
74 | 80 |
75 // Handles mismatch between WebAudio buffer size and WebRTC. | 81 // Handles mismatch between WebAudio buffer size and WebRTC. |
76 scoped_ptr<media::AudioFifo> fifo_; | 82 scoped_ptr<media::AudioFifo> fifo_; |
77 | 83 |
78 // Synchronizes HandleCapture() with AudioCapturerSource calls. | 84 // Synchronizes HandleCapture() with AudioCapturerSource calls. |
79 base::Lock lock_; | 85 base::Lock lock_; |
80 bool started_; | 86 bool started_; |
81 | 87 |
| 88 // This object registers with a blink::WebMediaStreamSource. We keep track of |
| 89 // that in order to be able to deregister before stopping the audio track. |
| 90 blink::WebMediaStreamSource blink_source_; |
| 91 |
82 DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource); | 92 DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource); |
83 }; | 93 }; |
84 | 94 |
85 } // namespace content | 95 } // namespace content |
86 | 96 |
87 #endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ | 97 #endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ |
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