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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 <algorithm> |
| 6 #include "platform/audio/AudioBus.h" | 7 #include "platform/audio/AudioBus.h" |
| 7 #include "platform/audio/AudioUtilities.h" | 8 #include "platform/audio/AudioUtilities.h" |
| 8 #include "wtf/MathExtras.h" | 9 #include "wtf/MathExtras.h" |
| 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) { |
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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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