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Side by Side Diff: third_party/WebKit/Source/modules/webaudio/WaveShaperDSPKernel.cpp

Issue 2389253002: reflow comments in modules/{webaudio,vr} (Closed)
Patch Set: . Created 4 years, 2 months ago
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1 /* 1 /*
2 * Copyright (C) 2011, Google Inc. All rights reserved. 2 * Copyright (C) 2011, 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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89 89
90 if (!curveData || !curveLength) { 90 if (!curveData || !curveLength) {
91 memcpy(destination, source, sizeof(float) * framesToProcess); 91 memcpy(destination, source, sizeof(float) * framesToProcess);
92 return; 92 return;
93 } 93 }
94 94
95 // Apply waveshaping curve. 95 // Apply waveshaping curve.
96 for (unsigned i = 0; i < framesToProcess; ++i) { 96 for (unsigned i = 0; i < framesToProcess; ++i) {
97 const float input = source[i]; 97 const float input = source[i];
98 98
99 // Calculate a virtual index based on input -1 -> +1 with -1 being curve[0], +1 being 99 // Calculate a virtual index based on input -1 -> +1 with -1 being curve[0],
100 // curve[curveLength - 1], and 0 being at the center of the curve data. Then linearly 100 // +1 being curve[curveLength - 1], and 0 being at the center of the curve
101 // interpolate between the two points in the curve. 101 // data. Then linearly interpolate between the two points in the curve.
102 double virtualIndex = 0.5 * (input + 1) * (curveLength - 1); 102 double virtualIndex = 0.5 * (input + 1) * (curveLength - 1);
103 double output; 103 double output;
104 104
105 if (virtualIndex < 0) { 105 if (virtualIndex < 0) {
106 // input < -1, so use curve[0] 106 // input < -1, so use curve[0]
107 output = curveData[0]; 107 output = curveData[0];
108 } else if (virtualIndex >= curveLength - 1) { 108 } else if (virtualIndex >= curveLength - 1) {
109 // input >= 1, so use last curve value 109 // input >= 1, so use last curve value
110 output = curveData[curveLength - 1]; 110 output = curveData[curveLength - 1];
111 } else { 111 } else {
112 // The general case where -1 <= input < 1, where 0 <= virtualIndex < curve Length - 1, 112 // The general case where -1 <= input < 1, where 0 <= virtualIndex <
113 // so interpolate between the nearest samples on the curve. 113 // curveLength - 1, so interpolate between the nearest samples on the
114 // curve.
114 unsigned index1 = static_cast<unsigned>(virtualIndex); 115 unsigned index1 = static_cast<unsigned>(virtualIndex);
115 unsigned index2 = index1 + 1; 116 unsigned index2 = index1 + 1;
116 double interpolationFactor = virtualIndex - index1; 117 double interpolationFactor = virtualIndex - index1;
117 118
118 double value1 = curveData[index1]; 119 double value1 = curveData[index1];
119 double value2 = curveData[index2]; 120 double value2 = curveData[index2];
120 121
121 output = 122 output =
122 (1.0 - interpolationFactor) * value1 + interpolationFactor * value2; 123 (1.0 - interpolationFactor) * value1 + interpolationFactor * value2;
123 } 124 }
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197 break; 198 break;
198 } 199 }
199 default: 200 default:
200 ASSERT_NOT_REACHED(); 201 ASSERT_NOT_REACHED();
201 } 202 }
202 203
203 return static_cast<double>(latencyFrames) / sampleRate(); 204 return static_cast<double>(latencyFrames) / sampleRate();
204 } 205 }
205 206
206 } // namespace blink 207 } // namespace blink
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