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Side by Side Diff: third_party/WebKit/Source/platform/audio/AudioUtilities.h

Issue 2384073002: reflow comments in platform/audio (Closed)
Patch Set: comments (heh!) Created 4 years, 2 months ago
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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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