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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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24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 */ | 27 */ |
28 | 28 |
29 #ifndef AudioDestination_h | 29 #ifndef AudioDestination_h |
30 #define AudioDestination_h | 30 #define AudioDestination_h |
31 | 31 |
32 #include "platform/audio/AudioBus.h" | 32 #include "platform/audio/AudioBus.h" |
33 #include "platform/audio/AudioIOCallback.h" | 33 #include "platform/audio/AudioIOCallback.h" |
| 34 #include "platform/audio/AudioSourceProvider.h" |
34 #include "public/platform/WebAudioDevice.h" | 35 #include "public/platform/WebAudioDevice.h" |
35 #include "public/platform/WebVector.h" | 36 #include "public/platform/WebVector.h" |
36 #include "wtf/Allocator.h" | 37 #include "wtf/Allocator.h" |
37 #include "wtf/Noncopyable.h" | 38 #include "wtf/Noncopyable.h" |
38 #include "wtf/text/WTFString.h" | 39 #include "wtf/text/WTFString.h" |
39 #include <memory> | 40 #include <memory> |
40 | 41 |
41 namespace blink { | 42 namespace blink { |
42 | 43 |
43 class PushPullFIFO; | 44 class AudioPullFIFO; |
44 class SecurityOrigin; | 45 class SecurityOrigin; |
45 | 46 |
46 // The AudioDestination class is an audio sink interface between the media | 47 // The AudioDestination class is an audio sink interface between the media |
47 // renderer and the Blink's WebAudio module. It has a FIFO to adapt the | 48 // renderer and the Blink's WebAudio module. It has a FIFO to adapt the |
48 // different processing block sizes of WebAudio renderer and actual hardware | 49 // different processing block sizes of WebAudio renderer and actual hardware |
49 // audio callback. | 50 // audio callback. |
50 class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback { | 51 class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback, |
| 52 public AudioSourceProvider { |
51 USING_FAST_MALLOC(AudioDestination); | 53 USING_FAST_MALLOC(AudioDestination); |
52 WTF_MAKE_NONCOPYABLE(AudioDestination); | 54 WTF_MAKE_NONCOPYABLE(AudioDestination); |
53 | 55 |
54 public: | 56 public: |
55 AudioDestination(AudioIOCallback&, | 57 AudioDestination(AudioIOCallback&, |
56 unsigned numberOfOutputChannels, | 58 unsigned numberOfOutputChannels, |
57 float sampleRate, | 59 float sampleRate, |
58 PassRefPtr<SecurityOrigin>); | 60 PassRefPtr<SecurityOrigin>); |
59 ~AudioDestination() override; | 61 ~AudioDestination() override; |
60 | 62 |
61 static std::unique_ptr<AudioDestination> create( | 63 static std::unique_ptr<AudioDestination> create( |
62 AudioIOCallback&, | 64 AudioIOCallback&, |
63 unsigned numberOfOutputChannels, | 65 unsigned numberOfOutputChannels, |
64 float sampleRate, | 66 float sampleRate, |
65 PassRefPtr<SecurityOrigin>); | 67 PassRefPtr<SecurityOrigin>); |
66 | 68 |
67 // The actual render function (WebAudioDevice::RenderCallback) isochronously | 69 // The actual render function (WebAudioDevice::RenderCallback) isochronously |
68 // invoked by the media renderer. | 70 // invoked by the media renderer. |
69 void render(const WebVector<float*>& destinationData, | 71 void render(const WebVector<float*>& destinationData, |
70 size_t numberOfFrames, | 72 size_t numberOfFrames, |
71 double delay, | 73 double delay, |
72 double delayTimestamp, | 74 double delayTimestamp, |
73 size_t priorFramesSkipped) override; | 75 size_t priorFramesSkipped) override; |
74 | 76 |
| 77 // AudioSourceProvider (FIFO) |
| 78 void provideInput(AudioBus* outputBus, size_t framesToProcess) override; |
| 79 |
75 virtual void start(); | 80 virtual void start(); |
76 virtual void stop(); | 81 virtual void stop(); |
77 | 82 |
78 size_t callbackBufferSize() const { return m_callbackBufferSize; } | 83 size_t callbackBufferSize() const { return m_callbackBufferSize; } |
79 float sampleRate() const { return m_sampleRate; } | 84 float sampleRate() const { return m_sampleRate; } |
80 bool isPlaying() { return m_isPlaying; } | 85 bool isPlaying() { return m_isPlaying; } |
81 | 86 |
82 // The information from the actual audio hardware. (via Platform::current) | 87 // The information from the actual audio hardware. (via Platform::current) |
83 static float hardwareSampleRate(); | 88 static float hardwareSampleRate(); |
84 static unsigned long maxChannelCount(); | 89 static unsigned long maxChannelCount(); |
85 | 90 |
86 private: | 91 private: |
87 std::unique_ptr<WebAudioDevice> m_webAudioDevice; | 92 std::unique_ptr<WebAudioDevice> m_webAudioDevice; |
88 unsigned m_numberOfOutputChannels; | 93 unsigned m_numberOfOutputChannels; |
89 size_t m_callbackBufferSize; | 94 size_t m_callbackBufferSize; |
90 float m_sampleRate; | 95 float m_sampleRate; |
91 bool m_isPlaying; | 96 bool m_isPlaying; |
92 | 97 |
93 // The render callback function of WebAudio engine. (i.e. DestinationNode) | 98 // The render callback function of WebAudio engine. (i.e. DestinationNode) |
94 AudioIOCallback& m_callback; | 99 AudioIOCallback& m_callback; |
95 | 100 |
96 // To pass the data from FIFO to the audio device callback. | |
97 RefPtr<AudioBus> m_outputBus; | 101 RefPtr<AudioBus> m_outputBus; |
98 | 102 std::unique_ptr<AudioPullFIFO> m_fifo; |
99 // To push the rendered result from WebAudio graph into the FIFO. | |
100 RefPtr<AudioBus> m_renderBus; | |
101 | |
102 // Resolves the buffer size mismatch between the WebAudio engine and | |
103 // the callback function from the actual audio device. | |
104 std::unique_ptr<PushPullFIFO> m_fifo; | |
105 | 103 |
106 size_t m_framesElapsed; | 104 size_t m_framesElapsed; |
107 AudioIOPosition m_outputPosition; | 105 AudioIOPosition m_outputPosition; |
108 base::TimeTicks m_outputPositionReceivedTimestamp; | 106 base::TimeTicks m_outputPositionReceivedTimestamp; |
109 | 107 |
110 // Calculate the optimum buffer size for a given platform. Return false if the | 108 // Calculate the optimum buffer size for a given platform. Return false if the |
111 // buffer size calculation fails. | 109 // buffer size calculation fails. |
112 bool calculateBufferSize(); | 110 bool calculateBufferSize(); |
113 | 111 |
114 size_t hardwareBufferSize(); | 112 size_t hardwareBufferSize(); |
115 }; | 113 }; |
116 | 114 |
117 } // namespace blink | 115 } // namespace blink |
118 | 116 |
119 #endif // AudioDestination_h | 117 #endif // AudioDestination_h |
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