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Side by Side Diff: third_party/WebKit/Source/platform/audio/StereoPanner.cpp

Issue 2547053003: s/ passed(...) / WTF::passed(...) / to avoid future ambiguity w/ base::Passed. (Closed)
Patch Set: Rebasing... Created 4 years ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "platform/audio/StereoPanner.h" 5 #include "platform/audio/StereoPanner.h"
6 #include "platform/audio/AudioBus.h" 6 #include "platform/audio/AudioBus.h"
7 #include "platform/audio/AudioUtilities.h" 7 #include "platform/audio/AudioUtilities.h"
8 #include "wtf/MathExtras.h" 8 #include "wtf/MathExtras.h"
9 #include <algorithm> 9 #include <algorithm>
10 10
11 // Use a 50ms smoothing / de-zippering time-constant. 11 // Use a 50ms smoothing / de-zippering time-constant.
12 const float SmoothingTimeConstant = 0.050f; 12 const float SmoothingTimeConstant = 0.050f;
13 13
14 namespace blink { 14 namespace blink {
15 15
16 // Implement equal-power panning algorithm for mono or stereo input. 16 // Implement equal-power panning algorithm for mono or stereo input.
17 // See: http://webaudio.github.io/web-audio-api/#panning-algorithm 17 // See: http://webaudio.github.io/web-audio-api/#panning-algorithm
18 18
19 std::unique_ptr<StereoPanner> StereoPanner::create(float sampleRate) { 19 std::unique_ptr<StereoPanner> StereoPanner::create(float sampleRate) {
20 return wrapUnique(new StereoPanner(sampleRate)); 20 return WTF::wrapUnique(new StereoPanner(sampleRate));
21 } 21 }
22 22
23 StereoPanner::StereoPanner(float sampleRate) 23 StereoPanner::StereoPanner(float sampleRate)
24 : m_isFirstRender(true), m_pan(0.0) { 24 : m_isFirstRender(true), m_pan(0.0) {
25 // Convert smoothing time (50ms) to a per-sample time value. 25 // Convert smoothing time (50ms) to a per-sample time value.
26 m_smoothingConstant = AudioUtilities::discreteTimeConstantForSampleRate( 26 m_smoothingConstant = AudioUtilities::discreteTimeConstantForSampleRate(
27 SmoothingTimeConstant, sampleRate); 27 SmoothingTimeConstant, sampleRate);
28 } 28 }
29 29
30 void StereoPanner::panWithSampleAccurateValues(const AudioBus* inputBus, 30 void StereoPanner::panWithSampleAccurateValues(const AudioBus* inputBus,
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172 // When [0; 1], keep right channel intact and equal-power pan the 172 // When [0; 1], keep right channel intact and equal-power pan the
173 // left channel only. 173 // left channel only.
174 *destinationL++ = static_cast<float>(inputL * gainL); 174 *destinationL++ = static_cast<float>(inputL * gainL);
175 *destinationR++ = static_cast<float>(inputR + inputL * gainR); 175 *destinationR++ = static_cast<float>(inputR + inputL * gainR);
176 } 176 }
177 } 177 }
178 } 178 }
179 } 179 }
180 180
181 } // namespace blink 181 } // namespace blink
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