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1 /* | 1 /* |
2 * Copyright (C) 2012 Google Inc. All rights reserved. | 2 * Copyright (C) 2012 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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38 #include <algorithm> | 38 #include <algorithm> |
39 | 39 |
40 const unsigned PeriodicWaveSize = 4096; // This must be a power of two. | 40 const unsigned PeriodicWaveSize = 4096; // This must be a power of two. |
41 const unsigned NumberOfRanges = 36; // There should be 3 * log2(PeriodicWaveSize
) 1/3 octave ranges. | 41 const unsigned NumberOfRanges = 36; // There should be 3 * log2(PeriodicWaveSize
) 1/3 octave ranges. |
42 const float CentsPerRange = 1200 / 3; // 1/3 Octave. | 42 const float CentsPerRange = 1200 / 3; // 1/3 Octave. |
43 | 43 |
44 namespace WebCore { | 44 namespace WebCore { |
45 | 45 |
46 using namespace VectorMath; | 46 using namespace VectorMath; |
47 | 47 |
48 PassRefPtr<PeriodicWave> PeriodicWave::create(float sampleRate, Float32Array* re
al, Float32Array* imag) | 48 PassRefPtrWillBeRawPtr<PeriodicWave> PeriodicWave::create(float sampleRate, Floa
t32Array* real, Float32Array* imag) |
49 { | 49 { |
50 bool isGood = real && imag && real->length() == imag->length(); | 50 bool isGood = real && imag && real->length() == imag->length(); |
51 ASSERT(isGood); | 51 ASSERT(isGood); |
52 if (isGood) { | 52 if (isGood) { |
53 RefPtr<PeriodicWave> periodicWave = adoptRef(new PeriodicWave(sampleRate
)); | 53 RefPtrWillBeRawPtr<PeriodicWave> periodicWave = adoptRefWillBeNoop(new P
eriodicWave(sampleRate)); |
54 size_t numberOfComponents = real->length(); | 54 size_t numberOfComponents = real->length(); |
55 periodicWave->createBandLimitedTables(real->data(), imag->data(), number
OfComponents); | 55 periodicWave->createBandLimitedTables(real->data(), imag->data(), number
OfComponents); |
56 return periodicWave; | 56 return periodicWave; |
57 } | 57 } |
58 return nullptr; | 58 return nullptr; |
59 } | 59 } |
60 | 60 |
61 PassRefPtr<PeriodicWave> PeriodicWave::createSine(float sampleRate) | 61 PassRefPtrWillBeRawPtr<PeriodicWave> PeriodicWave::createSine(float sampleRate) |
62 { | 62 { |
63 RefPtr<PeriodicWave> periodicWave = adoptRef(new PeriodicWave(sampleRate)); | 63 RefPtrWillBeRawPtr<PeriodicWave> periodicWave = adoptRefWillBeNoop(new Perio
dicWave(sampleRate)); |
64 periodicWave->generateBasicWaveform(OscillatorNode::SINE); | 64 periodicWave->generateBasicWaveform(OscillatorNode::SINE); |
65 return periodicWave; | 65 return periodicWave; |
66 } | 66 } |
67 | 67 |
68 PassRefPtr<PeriodicWave> PeriodicWave::createSquare(float sampleRate) | 68 PassRefPtrWillBeRawPtr<PeriodicWave> PeriodicWave::createSquare(float sampleRate
) |
69 { | 69 { |
70 RefPtr<PeriodicWave> periodicWave = adoptRef(new PeriodicWave(sampleRate)); | 70 RefPtrWillBeRawPtr<PeriodicWave> periodicWave = adoptRefWillBeNoop(new Perio
dicWave(sampleRate)); |
71 periodicWave->generateBasicWaveform(OscillatorNode::SQUARE); | 71 periodicWave->generateBasicWaveform(OscillatorNode::SQUARE); |
72 return periodicWave; | 72 return periodicWave; |
73 } | 73 } |
74 | 74 |
75 PassRefPtr<PeriodicWave> PeriodicWave::createSawtooth(float sampleRate) | 75 PassRefPtrWillBeRawPtr<PeriodicWave> PeriodicWave::createSawtooth(float sampleRa
te) |
76 { | 76 { |
77 RefPtr<PeriodicWave> periodicWave = adoptRef(new PeriodicWave(sampleRate)); | 77 RefPtrWillBeRawPtr<PeriodicWave> periodicWave = adoptRefWillBeNoop(new Perio
dicWave(sampleRate)); |
78 periodicWave->generateBasicWaveform(OscillatorNode::SAWTOOTH); | 78 periodicWave->generateBasicWaveform(OscillatorNode::SAWTOOTH); |
79 return periodicWave; | 79 return periodicWave; |
80 } | 80 } |
81 | 81 |
82 PassRefPtr<PeriodicWave> PeriodicWave::createTriangle(float sampleRate) | 82 PassRefPtrWillBeRawPtr<PeriodicWave> PeriodicWave::createTriangle(float sampleRa
te) |
83 { | 83 { |
84 RefPtr<PeriodicWave> periodicWave = adoptRef(new PeriodicWave(sampleRate)); | 84 RefPtrWillBeRawPtr<PeriodicWave> periodicWave = adoptRefWillBeNoop(new Perio
dicWave(sampleRate)); |
85 periodicWave->generateBasicWaveform(OscillatorNode::TRIANGLE); | 85 periodicWave->generateBasicWaveform(OscillatorNode::TRIANGLE); |
86 return periodicWave; | 86 return periodicWave; |
87 } | 87 } |
88 | 88 |
89 PeriodicWave::PeriodicWave(float sampleRate) | 89 PeriodicWave::PeriodicWave(float sampleRate) |
90 : m_sampleRate(sampleRate) | 90 : m_sampleRate(sampleRate) |
91 , m_periodicWaveSize(PeriodicWaveSize) | 91 , m_periodicWaveSize(PeriodicWaveSize) |
92 , m_numberOfRanges(NumberOfRanges) | 92 , m_numberOfRanges(NumberOfRanges) |
93 , m_centsPerRange(CentsPerRange) | 93 , m_centsPerRange(CentsPerRange) |
94 { | 94 { |
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296 realP[n] = 0; | 296 realP[n] = 0; |
297 imagP[n] = b; | 297 imagP[n] = b; |
298 } | 298 } |
299 | 299 |
300 createBandLimitedTables(realP, imagP, halfSize); | 300 createBandLimitedTables(realP, imagP, halfSize); |
301 } | 301 } |
302 | 302 |
303 } // namespace WebCore | 303 } // namespace WebCore |
304 | 304 |
305 #endif // ENABLE(WEB_AUDIO) | 305 #endif // ENABLE(WEB_AUDIO) |
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