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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 |
| 11 * documentation and/or other materials provided with the distribution. | 11 * documentation and/or other materials provided with the distribution. |
| 12 * | 12 * |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND | 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND |
| 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 16 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE | 16 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE |
| 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 23 * DAMAGE. | 23 * DAMAGE. |
| 24 */ | 24 */ |
| 25 | 25 |
| 26 #include "modules/webaudio/RealtimeAnalyser.h" | 26 #include "modules/webaudio/RealtimeAnalyser.h" |
| 27 #include <limits.h> |
| 28 #include <algorithm> |
| 29 #include <complex> |
| 27 #include "platform/audio/AudioBus.h" | 30 #include "platform/audio/AudioBus.h" |
| 28 #include "platform/audio/AudioUtilities.h" | 31 #include "platform/audio/AudioUtilities.h" |
| 29 #include "platform/audio/VectorMath.h" | 32 #include "platform/audio/VectorMath.h" |
| 30 #include "wtf/MathExtras.h" | 33 #include "wtf/MathExtras.h" |
| 31 #include "wtf/PtrUtil.h" | 34 #include "wtf/PtrUtil.h" |
| 32 #include <algorithm> | |
| 33 #include <complex> | |
| 34 #include <limits.h> | |
| 35 | 35 |
| 36 namespace blink { | 36 namespace blink { |
| 37 | 37 |
| 38 const double RealtimeAnalyser::DefaultSmoothingTimeConstant = 0.8; | 38 const double RealtimeAnalyser::DefaultSmoothingTimeConstant = 0.8; |
| 39 const double RealtimeAnalyser::DefaultMinDecibels = -100; | 39 const double RealtimeAnalyser::DefaultMinDecibels = -100; |
| 40 const double RealtimeAnalyser::DefaultMaxDecibels = -30; | 40 const double RealtimeAnalyser::DefaultMaxDecibels = -30; |
| 41 | 41 |
| 42 const unsigned RealtimeAnalyser::DefaultFFTSize = 2048; | 42 const unsigned RealtimeAnalyser::DefaultFFTSize = 2048; |
| 43 // All FFT implementations are expected to handle power-of-two sizes | 43 // All FFT implementations are expected to handle power-of-two sizes |
| 44 // MinFFTSize <= size <= MaxFFTSize. | 44 // MinFFTSize <= size <= MaxFFTSize. |
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| 331 scaledValue = 0; | 331 scaledValue = 0; |
| 332 if (scaledValue > UCHAR_MAX) | 332 if (scaledValue > UCHAR_MAX) |
| 333 scaledValue = UCHAR_MAX; | 333 scaledValue = UCHAR_MAX; |
| 334 | 334 |
| 335 destination[i] = static_cast<unsigned char>(scaledValue); | 335 destination[i] = static_cast<unsigned char>(scaledValue); |
| 336 } | 336 } |
| 337 } | 337 } |
| 338 } | 338 } |
| 339 | 339 |
| 340 } // namespace blink | 340 } // namespace blink |
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