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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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31 #if ENABLE(WEB_AUDIO) | 31 #if ENABLE(WEB_AUDIO) |
32 | 32 |
33 #include "platform/audio/HRTFKernel.h" | 33 #include "platform/audio/HRTFKernel.h" |
34 | 34 |
35 #include "platform/audio/AudioChannel.h" | 35 #include "platform/audio/AudioChannel.h" |
36 #include "platform/FloatConversion.h" | 36 #include "platform/FloatConversion.h" |
37 #include "wtf/MathExtras.h" | 37 #include "wtf/MathExtras.h" |
38 | 38 |
39 using namespace std; | 39 using namespace std; |
40 | 40 |
41 namespace WebCore { | 41 namespace blink { |
42 | 42 |
43 // Takes the input AudioChannel as an input impulse response and calculates the
average group delay. | 43 // Takes the input AudioChannel as an input impulse response and calculates the
average group delay. |
44 // This represents the initial delay before the most energetic part of the impul
se response. | 44 // This represents the initial delay before the most energetic part of the impul
se response. |
45 // The sample-frame delay is removed from the impulseP impulse response, and thi
s value is returned. | 45 // The sample-frame delay is removed from the impulseP impulse response, and thi
s value is returned. |
46 // the length of the passed in AudioChannel must be a power of 2. | 46 // the length of the passed in AudioChannel must be a power of 2. |
47 static float extractAverageGroupDelay(AudioChannel* channel, size_t analysisFFTS
ize) | 47 static float extractAverageGroupDelay(AudioChannel* channel, size_t analysisFFTS
ize) |
48 { | 48 { |
49 ASSERT(channel); | 49 ASSERT(channel); |
50 | 50 |
51 float* impulseP = channel->mutableData(); | 51 float* impulseP = channel->mutableData(); |
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123 ASSERT(sampleRate1 == sampleRate2); | 123 ASSERT(sampleRate1 == sampleRate2); |
124 if (sampleRate1 != sampleRate2) | 124 if (sampleRate1 != sampleRate2) |
125 return nullptr; | 125 return nullptr; |
126 | 126 |
127 float frameDelay = (1 - x) * kernel1->frameDelay() + x * kernel2->frameDelay
(); | 127 float frameDelay = (1 - x) * kernel1->frameDelay() + x * kernel2->frameDelay
(); |
128 | 128 |
129 OwnPtr<FFTFrame> interpolatedFrame = FFTFrame::createInterpolatedFrame(*kern
el1->fftFrame(), *kernel2->fftFrame(), x); | 129 OwnPtr<FFTFrame> interpolatedFrame = FFTFrame::createInterpolatedFrame(*kern
el1->fftFrame(), *kernel2->fftFrame(), x); |
130 return HRTFKernel::create(interpolatedFrame.release(), frameDelay, sampleRat
e1); | 130 return HRTFKernel::create(interpolatedFrame.release(), frameDelay, sampleRat
e1); |
131 } | 131 } |
132 | 132 |
133 } // namespace WebCore | 133 } // namespace blink |
134 | 134 |
135 #endif // ENABLE(WEB_AUDIO) | 135 #endif // ENABLE(WEB_AUDIO) |
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