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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ | |
6 #define CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ | |
7 | |
8 #include <stddef.h> | |
9 | |
10 #include "base/macros.h" | |
11 #include "base/memory/ref_counted.h" | |
12 #include "base/synchronization/lock.h" | |
13 #include "base/threading/thread_checker.h" | |
14 #include "media/audio/audio_parameters.h" | |
15 #include "media/base/audio_capturer_source.h" | |
16 #include "media/base/audio_fifo.h" | |
17 #include "third_party/WebKit/public/platform/WebAudioDestinationConsumer.h" | |
18 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h" | |
19 #include "third_party/WebKit/public/platform/WebVector.h" | |
20 | |
21 namespace content { | |
22 | |
23 class WebRtcLocalAudioTrack; | |
24 | |
25 // WebAudioCapturerSource is the missing link between | |
26 // WebAudio's MediaStreamAudioDestinationNode and WebRtcLocalAudioTrack. | |
27 // | |
28 // 1. WebKit calls the setFormat() method setting up the basic stream format | |
29 // (channels, and sample-rate). | |
30 // 2. consumeAudio() is called periodically by WebKit which dispatches the | |
31 // audio stream to the WebRtcLocalAudioTrack::Capture() method. | |
32 class WebAudioCapturerSource | |
33 : public base::RefCountedThreadSafe<WebAudioCapturerSource>, | |
34 public blink::WebAudioDestinationConsumer { | |
35 public: | |
36 explicit WebAudioCapturerSource( | |
37 const blink::WebMediaStreamSource& blink_source); | |
38 | |
39 // WebAudioDestinationConsumer implementation. | |
40 // setFormat() is called early on, so that we can configure the audio track. | |
41 void setFormat(size_t number_of_channels, float sample_rate) override; | |
42 // MediaStreamAudioDestinationNode periodically calls consumeAudio(). | |
43 // Called on the WebAudio audio thread. | |
44 void consumeAudio(const blink::WebVector<const float*>& audio_data, | |
45 size_t number_of_frames) override; | |
46 | |
47 // Called when the WebAudioCapturerSource is hooking to a media audio track. | |
48 // |track| is the sink of the data flow. |source_provider| is the source of | |
49 // the data flow where stream information like delay, volume, key_pressed, | |
50 // is stored. | |
51 void Start(WebRtcLocalAudioTrack* track); | |
52 | |
53 // Called when the media audio track is stopping. | |
54 void Stop(); | |
55 | |
56 protected: | |
57 friend class base::RefCountedThreadSafe<WebAudioCapturerSource>; | |
58 ~WebAudioCapturerSource() override; | |
59 | |
60 private: | |
61 // Removes this object from a blink::WebMediaStreamSource with which it | |
62 // might be registered. The goal is to avoid dangling pointers. | |
63 void removeFromBlinkSource(); | |
64 | |
65 // Used to DCHECK that some methods are called on the correct thread. | |
66 base::ThreadChecker thread_checker_; | |
67 | |
68 // The audio track this WebAudioCapturerSource is feeding data to. | |
69 // WebRtcLocalAudioTrack is reference counted, and owning this object. | |
70 // To avoid circular reference, a raw pointer is kept here. | |
71 WebRtcLocalAudioTrack* track_; | |
72 | |
73 media::AudioParameters params_; | |
74 | |
75 // Flag to help notify the |track_| when the audio format has changed. | |
76 bool audio_format_changed_; | |
77 | |
78 // Wraps data coming from HandleCapture(). | |
79 scoped_ptr<media::AudioBus> wrapper_bus_; | |
80 | |
81 // Bus for reading from FIFO and calling the CaptureCallback. | |
82 scoped_ptr<media::AudioBus> capture_bus_; | |
83 | |
84 // Handles mismatch between WebAudio buffer size and WebRTC. | |
85 scoped_ptr<media::AudioFifo> fifo_; | |
86 | |
87 // Synchronizes HandleCapture() with AudioCapturerSource calls. | |
88 base::Lock lock_; | |
89 bool started_; | |
90 | |
91 // This object registers with a blink::WebMediaStreamSource. We keep track of | |
92 // that in order to be able to deregister before stopping the audio track. | |
93 blink::WebMediaStreamSource blink_source_; | |
94 | |
95 DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource); | |
96 }; | |
97 | |
98 } // namespace content | |
99 | |
100 #endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_ | |
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