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1 // Copyright 2013 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_WEBAUDIOSOURCEPROVIDER_IMPL_H_ | |
6 #define CONTENT_RENDERER_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_ | |
7 | |
8 #include "base/callback.h" | |
9 #include "base/memory/weak_ptr.h" | |
10 #include "base/synchronization/lock.h" | |
11 #include "content/common/content_export.h" | |
12 #include "media/base/audio_renderer_sink.h" | |
13 #include "third_party/WebKit/public/platform/WebAudioSourceProvider.h" | |
14 #include "third_party/WebKit/public/platform/WebVector.h" | |
15 | |
16 namespace blink { | |
17 class WebAudioSourceProviderClient; | |
18 } | |
19 | |
20 namespace content { | |
21 | |
22 // WebAudioSourceProviderImpl provides a bridge between classes: | |
23 // blink::WebAudioSourceProvider <---> media::AudioRendererSink | |
24 // | |
25 // WebAudioSourceProviderImpl wraps an existing audio sink that is used unless | |
26 // WebKit has set a client via setClient(). While a client is set WebKit will | |
27 // periodically call provideInput() to render a certain number of audio | |
28 // sample-frames using the sink's RenderCallback to get the data. | |
29 // | |
30 // All calls are protected by a lock. | |
31 class CONTENT_EXPORT WebAudioSourceProviderImpl | |
32 : NON_EXPORTED_BASE(public blink::WebAudioSourceProvider), | |
33 NON_EXPORTED_BASE(public media::AudioRendererSink) { | |
34 public: | |
35 explicit WebAudioSourceProviderImpl( | |
36 const scoped_refptr<media::AudioRendererSink>& sink); | |
37 | |
38 // blink::WebAudioSourceProvider implementation. | |
39 virtual void setClient(blink::WebAudioSourceProviderClient* client); | |
40 virtual void provideInput(const blink::WebVector<float*>& audio_data, | |
41 size_t number_of_frames); | |
42 | |
43 // media::AudioRendererSink implementation. | |
44 virtual void Start() OVERRIDE; | |
45 virtual void Stop() OVERRIDE; | |
46 virtual void Play() OVERRIDE; | |
47 virtual void Pause() OVERRIDE; | |
48 virtual bool SetVolume(double volume) OVERRIDE; | |
49 virtual void Initialize(const media::AudioParameters& params, | |
50 RenderCallback* renderer) OVERRIDE; | |
51 | |
52 protected: | |
53 virtual ~WebAudioSourceProviderImpl(); | |
54 | |
55 private: | |
56 // Calls setFormat() on |client_| from the Blink renderer thread. | |
57 void OnSetFormat(); | |
58 | |
59 // Closure that posts a task to call OnSetFormat() on the renderer thread. | |
60 base::Closure set_format_cb_; | |
61 | |
62 // Set to true when Initialize() is called. | |
63 int channels_; | |
64 int sample_rate_; | |
65 double volume_; | |
66 | |
67 // Tracks the current playback state. | |
68 enum PlaybackState { kStopped, kStarted, kPlaying }; | |
69 PlaybackState state_; | |
70 | |
71 // Where audio comes from. | |
72 media::AudioRendererSink::RenderCallback* renderer_; | |
73 | |
74 // When set via setClient() it overrides |sink_| for consuming audio. | |
75 blink::WebAudioSourceProviderClient* client_; | |
76 | |
77 // Where audio ends up unless overridden by |client_|. | |
78 base::Lock sink_lock_; | |
79 scoped_refptr<media::AudioRendererSink> sink_; | |
80 scoped_ptr<media::AudioBus> bus_wrapper_; | |
81 | |
82 // NOTE: Weak pointers must be invalidated before all other member variables. | |
83 base::WeakPtrFactory<WebAudioSourceProviderImpl> weak_factory_; | |
84 | |
85 DISALLOW_IMPLICIT_CONSTRUCTORS(WebAudioSourceProviderImpl); | |
86 }; | |
87 | |
88 } // namespace content | |
89 | |
90 #endif // CONTENT_RENDERER_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_ | |
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