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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 AN
Y | 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN
Y | 16 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE |
| 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O
N | 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 23 * DAMAGE. |
| 23 */ | 24 */ |
| 24 | 25 |
| 25 #ifndef AudioUtilities_h | 26 #ifndef AudioUtilities_h |
| 26 #define AudioUtilities_h | 27 #define AudioUtilities_h |
| 27 | 28 |
| 28 #include "platform/PlatformExport.h" | 29 #include "platform/PlatformExport.h" |
| 29 #include "wtf/build_config.h" | 30 #include "wtf/build_config.h" |
| 30 #include <cstddef> | 31 #include <cstddef> |
| 31 | 32 |
| 32 namespace blink { | 33 namespace blink { |
| 33 namespace AudioUtilities { | 34 namespace AudioUtilities { |
| 34 | 35 |
| 35 // Rendering quantum size. This is how many frames are processed at a time for
each node in the | 36 // Rendering quantum size. This is how many frames are processed at a time for |
| 36 // audio graph. | 37 // each node in the audio graph. |
| 37 static const unsigned kRenderQuantumFrames = 128; | 38 static const unsigned kRenderQuantumFrames = 128; |
| 38 | 39 |
| 39 // Standard functions for converting to and from decibel values from linear. | 40 // Standard functions for converting to and from decibel values from linear. |
| 40 PLATFORM_EXPORT float linearToDecibels(float); | 41 PLATFORM_EXPORT float linearToDecibels(float); |
| 41 PLATFORM_EXPORT float decibelsToLinear(float); | 42 PLATFORM_EXPORT float decibelsToLinear(float); |
| 42 | 43 |
| 43 // timeConstant is the time it takes a first-order linear time-invariant system | 44 // timeConstant is the time it takes a first-order linear time-invariant system |
| 44 // to reach the value 1 - 1/e (around 63.2%) given a step input response. | 45 // to reach the value 1 - 1/e (around 63.2%) given a step input response. |
| 45 // discreteTimeConstantForSampleRate() will return the discrete time-constant fo
r the specific sampleRate. | 46 // discreteTimeConstantForSampleRate() will return the discrete time-constant |
| 47 // for the specific sampleRate. |
| 46 PLATFORM_EXPORT double discreteTimeConstantForSampleRate(double timeConstant, | 48 PLATFORM_EXPORT double discreteTimeConstantForSampleRate(double timeConstant, |
| 47 double sampleRate); | 49 double sampleRate); |
| 48 | 50 |
| 49 // Convert the time to a sample frame at the given sample rate. | 51 // Convert the time to a sample frame at the given sample rate. |
| 50 PLATFORM_EXPORT size_t timeToSampleFrame(double time, double sampleRate); | 52 PLATFORM_EXPORT size_t timeToSampleFrame(double time, double sampleRate); |
| 51 | 53 |
| 52 // Check that |sampleRate| is a valid rate for AudioBuffers. | 54 // Check that |sampleRate| is a valid rate for AudioBuffers. |
| 53 PLATFORM_EXPORT bool isValidAudioBufferSampleRate(float sampleRate); | 55 PLATFORM_EXPORT bool isValidAudioBufferSampleRate(float sampleRate); |
| 54 | 56 |
| 55 // Return max/min sample rate supported by AudioBuffers. | 57 // Return max/min sample rate supported by AudioBuffers. |
| 56 PLATFORM_EXPORT float minAudioBufferSampleRate(); | 58 PLATFORM_EXPORT float minAudioBufferSampleRate(); |
| 57 PLATFORM_EXPORT float maxAudioBufferSampleRate(); | 59 PLATFORM_EXPORT float maxAudioBufferSampleRate(); |
| 58 } // namespace AudioUtilities | 60 } // namespace AudioUtilities |
| 59 } // namespace blink | 61 } // namespace blink |
| 60 | 62 |
| 61 #endif // AudioUtilities_h | 63 #endif // AudioUtilities_h |
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