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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 |
| (...skipping 20 matching lines...) Expand all Loading... |
| 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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