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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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33 namespace WebCore { | 33 namespace WebCore { |
34 | 34 |
35 class AudioBus; | 35 class AudioBus; |
36 class FFTFrame; | 36 class FFTFrame; |
37 | 37 |
38 class RealtimeAnalyser { | 38 class RealtimeAnalyser { |
39 WTF_MAKE_NONCOPYABLE(RealtimeAnalyser); | 39 WTF_MAKE_NONCOPYABLE(RealtimeAnalyser); |
40 public: | 40 public: |
41 RealtimeAnalyser(); | 41 RealtimeAnalyser(); |
42 virtual ~RealtimeAnalyser(); | 42 virtual ~RealtimeAnalyser(); |
43 | 43 |
44 void reset(); | 44 void reset(); |
45 | 45 |
46 size_t fftSize() const { return m_fftSize; } | 46 size_t fftSize() const { return m_fftSize; } |
47 bool setFftSize(size_t); | 47 bool setFftSize(size_t); |
48 | 48 |
49 unsigned frequencyBinCount() const { return m_fftSize / 2; } | 49 unsigned frequencyBinCount() const { return m_fftSize / 2; } |
50 | 50 |
51 void setMinDecibels(float k) { m_minDecibels = k; } | 51 void setMinDecibels(float k) { m_minDecibels = k; } |
52 float minDecibels() const { return static_cast<float>(m_minDecibels); } | 52 float minDecibels() const { return static_cast<float>(m_minDecibels); } |
53 | 53 |
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70 | 70 |
71 static const unsigned DefaultFFTSize; | 71 static const unsigned DefaultFFTSize; |
72 static const unsigned MinFFTSize; | 72 static const unsigned MinFFTSize; |
73 static const unsigned MaxFFTSize; | 73 static const unsigned MaxFFTSize; |
74 static const unsigned InputBufferSize; | 74 static const unsigned InputBufferSize; |
75 | 75 |
76 private: | 76 private: |
77 // The audio thread writes the input audio here. | 77 // The audio thread writes the input audio here. |
78 AudioFloatArray m_inputBuffer; | 78 AudioFloatArray m_inputBuffer; |
79 unsigned m_writeIndex; | 79 unsigned m_writeIndex; |
80 | 80 |
81 size_t m_fftSize; | 81 size_t m_fftSize; |
82 OwnPtr<FFTFrame> m_analysisFrame; | 82 OwnPtr<FFTFrame> m_analysisFrame; |
83 void doFFTAnalysis(); | 83 void doFFTAnalysis(); |
84 | 84 |
85 // doFFTAnalysis() stores the floating-point magnitude analysis data here. | 85 // doFFTAnalysis() stores the floating-point magnitude analysis data here. |
86 AudioFloatArray m_magnitudeBuffer; | 86 AudioFloatArray m_magnitudeBuffer; |
87 AudioFloatArray& magnitudeBuffer() { return m_magnitudeBuffer; } | 87 AudioFloatArray& magnitudeBuffer() { return m_magnitudeBuffer; } |
88 | 88 |
89 // A value between 0 and 1 which averages the previous version of m_magnitud
eBuffer with the current analysis magnitude data. | 89 // A value between 0 and 1 which averages the previous version of m_magnitud
eBuffer with the current analysis magnitude data. |
90 double m_smoothingTimeConstant; | 90 double m_smoothingTimeConstant; |
91 | 91 |
92 // The range used when converting when using getByteFrequencyData(). | 92 // The range used when converting when using getByteFrequencyData(). |
93 double m_minDecibels; | 93 double m_minDecibels; |
94 double m_maxDecibels; | 94 double m_maxDecibels; |
95 }; | 95 }; |
96 | 96 |
97 } // namespace WebCore | 97 } // namespace WebCore |
98 | 98 |
99 #endif // RealtimeAnalyser_h | 99 #endif // RealtimeAnalyser_h |
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