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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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24 | 24 |
25 #include "config.h" | 25 #include "config.h" |
26 | 26 |
27 #if ENABLE(WEB_AUDIO) | 27 #if ENABLE(WEB_AUDIO) |
28 | 28 |
29 #include "modules/webaudio/RealtimeAnalyser.h" | 29 #include "modules/webaudio/RealtimeAnalyser.h" |
30 | 30 |
31 #include "platform/audio/AudioBus.h" | 31 #include "platform/audio/AudioBus.h" |
32 #include "platform/audio/AudioUtilities.h" | 32 #include "platform/audio/AudioUtilities.h" |
33 #include "platform/audio/VectorMath.h" | 33 #include "platform/audio/VectorMath.h" |
34 #include "wtf/Complex.h" | |
35 #include "wtf/MainThread.h" | 34 #include "wtf/MainThread.h" |
36 #include "wtf/MathExtras.h" | 35 #include "wtf/MathExtras.h" |
37 #include <algorithm> | 36 #include <algorithm> |
| 37 #include <complex> |
38 #include <limits.h> | 38 #include <limits.h> |
39 | 39 |
40 namespace blink { | 40 namespace blink { |
41 | 41 |
42 const double RealtimeAnalyser::DefaultSmoothingTimeConstant = 0.8; | 42 const double RealtimeAnalyser::DefaultSmoothingTimeConstant = 0.8; |
43 const double RealtimeAnalyser::DefaultMinDecibels = -100; | 43 const double RealtimeAnalyser::DefaultMinDecibels = -100; |
44 const double RealtimeAnalyser::DefaultMaxDecibels = -30; | 44 const double RealtimeAnalyser::DefaultMaxDecibels = -30; |
45 | 45 |
46 const unsigned RealtimeAnalyser::DefaultFFTSize = 2048; | 46 const unsigned RealtimeAnalyser::DefaultFFTSize = 2048; |
47 // All FFT implementations are expected to handle power-of-two sizes MinFFTSize
<= size <= MaxFFTSize. | 47 // All FFT implementations are expected to handle power-of-two sizes MinFFTSize
<= size <= MaxFFTSize. |
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176 | 176 |
177 // A value of 0 does no averaging with the previous result. Larger values p
roduce slower, but smoother changes. | 177 // A value of 0 does no averaging with the previous result. Larger values p
roduce slower, but smoother changes. |
178 double k = m_smoothingTimeConstant; | 178 double k = m_smoothingTimeConstant; |
179 k = std::max(0.0, k); | 179 k = std::max(0.0, k); |
180 k = std::min(1.0, k); | 180 k = std::min(1.0, k); |
181 | 181 |
182 // Convert the analysis data from complex to magnitude and average with the
previous result. | 182 // Convert the analysis data from complex to magnitude and average with the
previous result. |
183 float* destination = magnitudeBuffer().data(); | 183 float* destination = magnitudeBuffer().data(); |
184 size_t n = magnitudeBuffer().size(); | 184 size_t n = magnitudeBuffer().size(); |
185 for (size_t i = 0; i < n; ++i) { | 185 for (size_t i = 0; i < n; ++i) { |
186 Complex c(realP[i], imagP[i]); | 186 std::complex<double> c(realP[i], imagP[i]); |
187 double scalarMagnitude = abs(c) * magnitudeScale; | 187 double scalarMagnitude = abs(c) * magnitudeScale; |
188 destination[i] = float(k * destination[i] + (1 - k) * scalarMagnitude); | 188 destination[i] = float(k * destination[i] + (1 - k) * scalarMagnitude); |
189 } | 189 } |
190 } | 190 } |
191 | 191 |
192 void RealtimeAnalyser::getFloatFrequencyData(DOMFloat32Array* destinationArray) | 192 void RealtimeAnalyser::getFloatFrequencyData(DOMFloat32Array* destinationArray) |
193 { | 193 { |
194 ASSERT(isMainThread()); | 194 ASSERT(isMainThread()); |
195 | 195 |
196 if (!destinationArray) | 196 if (!destinationArray) |
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314 scaledValue = UCHAR_MAX; | 314 scaledValue = UCHAR_MAX; |
315 | 315 |
316 destination[i] = static_cast<unsigned char>(scaledValue); | 316 destination[i] = static_cast<unsigned char>(scaledValue); |
317 } | 317 } |
318 } | 318 } |
319 } | 319 } |
320 | 320 |
321 } // namespace blink | 321 } // namespace blink |
322 | 322 |
323 #endif // ENABLE(WEB_AUDIO) | 323 #endif // ENABLE(WEB_AUDIO) |
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