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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 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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39 | 39 |
40 class AudioDestinationHandler : public AudioHandler, public AudioIOCallback { | 40 class AudioDestinationHandler : public AudioHandler, public AudioIOCallback { |
41 public: | 41 public: |
42 AudioDestinationHandler(AudioNode&, float sampleRate); | 42 AudioDestinationHandler(AudioNode&, float sampleRate); |
43 ~AudioDestinationHandler() override; | 43 ~AudioDestinationHandler() override; |
44 | 44 |
45 // AudioHandler | 45 // AudioHandler |
46 void process(size_t) final { | 46 void process(size_t) final { |
47 } // we're pulled by hardware so this is never called | 47 } // we're pulled by hardware so this is never called |
48 | 48 |
49 // The audio hardware calls render() to get the next render quantum of audio i
nto destinationBus. | 49 // The audio hardware calls render() to get the next render quantum of audio |
50 // It will optionally give us local/live audio input in sourceBus (if it's not
0). | 50 // into destinationBus. It will optionally give us local/live audio input in |
| 51 // sourceBus (if it's not 0). |
51 void render(AudioBus* sourceBus, | 52 void render(AudioBus* sourceBus, |
52 AudioBus* destinationBus, | 53 AudioBus* destinationBus, |
53 size_t numberOfFrames) final; | 54 size_t numberOfFrames) final; |
54 | 55 |
55 size_t currentSampleFrame() const { | 56 size_t currentSampleFrame() const { |
56 return acquireLoad(&m_currentSampleFrame); | 57 return acquireLoad(&m_currentSampleFrame); |
57 } | 58 } |
58 double currentTime() const { | 59 double currentTime() const { |
59 return currentSampleFrame() / static_cast<double>(sampleRate()); | 60 return currentSampleFrame() / static_cast<double>(sampleRate()); |
60 } | 61 } |
61 | 62 |
62 virtual unsigned long maxChannelCount() const { return 0; } | 63 virtual unsigned long maxChannelCount() const { return 0; } |
63 | 64 |
64 virtual void startRendering() = 0; | 65 virtual void startRendering() = 0; |
65 virtual void stopRendering() = 0; | 66 virtual void stopRendering() = 0; |
66 | 67 |
67 protected: | 68 protected: |
68 // LocalAudioInputProvider allows us to expose an AudioSourceProvider for loca
l/live audio input. | 69 // LocalAudioInputProvider allows us to expose an AudioSourceProvider for |
69 // If there is local/live audio input, we call set() with the audio input data
every render quantum. | 70 // local/live audio input. If there is local/live audio input, we call set() |
| 71 // with the audio input data every render quantum. |
70 class LocalAudioInputProvider final : public AudioSourceProvider { | 72 class LocalAudioInputProvider final : public AudioSourceProvider { |
71 public: | 73 public: |
72 LocalAudioInputProvider() | 74 LocalAudioInputProvider() |
73 : m_sourceBus(AudioBus::create( | 75 : m_sourceBus(AudioBus::create( |
74 2, | 76 2, |
75 ProcessingSizeInFrames)) // FIXME: handle non-stereo local input. | 77 ProcessingSizeInFrames)) // FIXME: handle non-stereo local input. |
76 {} | 78 {} |
77 | 79 |
78 void set(AudioBus* bus) { | 80 void set(AudioBus* bus) { |
79 if (bus) | 81 if (bus) |
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109 | 111 |
110 unsigned long maxChannelCount() const; | 112 unsigned long maxChannelCount() const; |
111 | 113 |
112 protected: | 114 protected: |
113 AudioDestinationNode(BaseAudioContext&); | 115 AudioDestinationNode(BaseAudioContext&); |
114 }; | 116 }; |
115 | 117 |
116 } // namespace blink | 118 } // namespace blink |
117 | 119 |
118 #endif // AudioDestinationNode_h | 120 #endif // AudioDestinationNode_h |
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