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1 /* | 1 /* |
2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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36 #include "platform/wtf/Noncopyable.h" | 36 #include "platform/wtf/Noncopyable.h" |
37 #include "platform/wtf/text/WTFString.h" | 37 #include "platform/wtf/text/WTFString.h" |
38 #include "public/platform/WebAudioDevice.h" | 38 #include "public/platform/WebAudioDevice.h" |
39 #include "public/platform/WebVector.h" | 39 #include "public/platform/WebVector.h" |
40 | 40 |
41 namespace blink { | 41 namespace blink { |
42 | 42 |
43 class PushPullFIFO; | 43 class PushPullFIFO; |
44 class SecurityOrigin; | 44 class SecurityOrigin; |
45 class WebAudioLatencyHint; | 45 class WebAudioLatencyHint; |
46 class WebThread; | 46 class WebThreadSupportingGC; |
47 | 47 |
48 // The AudioDestination class is an audio sink interface between the media | 48 // The AudioDestination class is an audio sink interface between the media |
49 // renderer and the Blink's WebAudio module. It has a FIFO to adapt the | 49 // renderer and the Blink's WebAudio module. It has a FIFO to adapt the |
50 // different processing block sizes of WebAudio renderer and actual hardware | 50 // different processing block sizes of WebAudio renderer and actual hardware |
51 // audio callback. | 51 // audio callback. |
52 class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback { | 52 class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback { |
53 USING_FAST_MALLOC(AudioDestination); | 53 USING_FAST_MALLOC(AudioDestination); |
54 WTF_MAKE_NONCOPYABLE(AudioDestination); | 54 WTF_MAKE_NONCOPYABLE(AudioDestination); |
55 | 55 |
56 public: | 56 public: |
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69 // The actual render function (WebAudioDevice::RenderCallback) isochronously | 69 // The actual render function (WebAudioDevice::RenderCallback) isochronously |
70 // invoked by the media renderer. | 70 // invoked by the media renderer. |
71 void Render(const WebVector<float*>& destination_data, | 71 void Render(const WebVector<float*>& destination_data, |
72 size_t number_of_frames, | 72 size_t number_of_frames, |
73 double delay, | 73 double delay, |
74 double delay_timestamp, | 74 double delay_timestamp, |
75 size_t prior_frames_skipped) override; | 75 size_t prior_frames_skipped) override; |
76 | 76 |
77 // The actual render request to the WebAudio destination node. This triggers | 77 // The actual render request to the WebAudio destination node. This triggers |
78 // the WebAudio rendering pipe line on the web thread. | 78 // the WebAudio rendering pipe line on the web thread. |
79 void RequestRenderOnWebThread(size_t frames_requested, | 79 void RequestRenderOnWorkerThread(size_t frames_requested, |
80 size_t frames_to_render, | 80 size_t frames_to_render, |
81 double delay, | 81 double delay, |
82 double delay_timestamp, | 82 double delay_timestamp, |
83 size_t prior_frames_skipped); | 83 size_t prior_frames_skipped); |
84 | 84 |
85 virtual void Start(); | 85 virtual void Start(WebThreadSupportingGC*); |
86 virtual void Stop(); | 86 virtual void Stop(); |
87 | 87 |
88 // Getters must be accessed from the main thread. | 88 // Getters must be accessed from the main thread. |
89 size_t CallbackBufferSize() const; | 89 size_t CallbackBufferSize() const; |
90 bool IsPlaying(); | 90 bool IsPlaying(); |
91 | 91 |
92 // TODO(hongchan): this should not be called by the rendering thread. | 92 // TODO(hongchan): this should not be called by the rendering thread. |
93 double SampleRate() const { return web_audio_device_->SampleRate(); } | 93 double SampleRate() const { return web_audio_device_->SampleRate(); } |
94 | 94 |
95 // Returns the audio buffer size in frames used by the underlying audio | 95 // Returns the audio buffer size in frames used by the underlying audio |
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108 | 108 |
109 bool IsRenderingThread(); | 109 bool IsRenderingThread(); |
110 | 110 |
111 // Accessed by the main thread. | 111 // Accessed by the main thread. |
112 std::unique_ptr<WebAudioDevice> web_audio_device_; | 112 std::unique_ptr<WebAudioDevice> web_audio_device_; |
113 const unsigned number_of_output_channels_; | 113 const unsigned number_of_output_channels_; |
114 size_t callback_buffer_size_; | 114 size_t callback_buffer_size_; |
115 bool is_playing_; | 115 bool is_playing_; |
116 | 116 |
117 // Accessed by the device thread. Rendering thread for WebAudio graph. | 117 // Accessed by the device thread. Rendering thread for WebAudio graph. |
118 std::unique_ptr<WebThread> rendering_thread_; | 118 WebThreadSupportingGC* rendering_thread_; |
119 | 119 |
120 // Accessed by both threads: resolves the buffer size mismatch between the | 120 // Accessed by both threads: resolves the buffer size mismatch between the |
121 // WebAudio engine and the callback function from the actual audio device. | 121 // WebAudio engine and the callback function from the actual audio device. |
122 std::unique_ptr<PushPullFIFO> fifo_; | 122 std::unique_ptr<PushPullFIFO> fifo_; |
123 | 123 |
124 // Accessed by device thread: to pass the data from FIFO to the device. | 124 // Accessed by device thread: to pass the data from FIFO to the device. |
125 RefPtr<AudioBus> output_bus_; | 125 RefPtr<AudioBus> output_bus_; |
126 | 126 |
127 // Accessed by rendering thread: to push the rendered result from WebAudio | 127 // Accessed by rendering thread: to push the rendered result from WebAudio |
128 // graph into the FIFO. | 128 // graph into the FIFO. |
129 RefPtr<AudioBus> render_bus_; | 129 RefPtr<AudioBus> render_bus_; |
130 | 130 |
131 // Accessed by rendering thread: the render callback function of WebAudio | 131 // Accessed by rendering thread: the render callback function of WebAudio |
132 // engine. (i.e. DestinationNode) | 132 // engine. (i.e. DestinationNode) |
133 AudioIOCallback& callback_; | 133 AudioIOCallback& callback_; |
134 | 134 |
135 // Accessed by rendering thread. | 135 // Accessed by rendering thread. |
136 size_t frames_elapsed_; | 136 size_t frames_elapsed_; |
137 }; | 137 }; |
138 | 138 |
139 } // namespace blink | 139 } // namespace blink |
140 | 140 |
141 #endif // AudioDestination_h | 141 #endif // AudioDestination_h |
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