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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 * | 7 * |
| 8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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| 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 */ | 27 */ |
| 28 | 28 |
| 29 #ifndef DynamicsCompressorKernel_h | 29 #ifndef DynamicsCompressorKernel_h |
| 30 #define DynamicsCompressorKernel_h | 30 #define DynamicsCompressorKernel_h |
| 31 | 31 |
| 32 #include "platform/PlatformExport.h" | 32 #include "platform/PlatformExport.h" |
| 33 #include "platform/audio/AudioArray.h" | 33 #include "platform/audio/AudioArray.h" |
| 34 #include "wtf/Allocator.h" | 34 #include "wtf/Allocator.h" |
| 35 #include "wtf/Noncopyable.h" | 35 #include "wtf/Noncopyable.h" |
| 36 #include <memory> | 36 #include "wtf/OwnPtr.h" |
| 37 #include "wtf/PassOwnPtr.h" |
| 37 | 38 |
| 38 namespace blink { | 39 namespace blink { |
| 39 | 40 |
| 40 class PLATFORM_EXPORT DynamicsCompressorKernel { | 41 class PLATFORM_EXPORT DynamicsCompressorKernel { |
| 41 DISALLOW_NEW(); | 42 DISALLOW_NEW(); |
| 42 WTF_MAKE_NONCOPYABLE(DynamicsCompressorKernel); | 43 WTF_MAKE_NONCOPYABLE(DynamicsCompressorKernel); |
| 43 public: | 44 public: |
| 44 DynamicsCompressorKernel(float sampleRate, unsigned numberOfChannels); | 45 DynamicsCompressorKernel(float sampleRate, unsigned numberOfChannels); |
| 45 | 46 |
| 46 void setNumberOfChannels(unsigned); | 47 void setNumberOfChannels(unsigned); |
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| 84 float m_meteringReleaseK; | 85 float m_meteringReleaseK; |
| 85 float m_meteringGain; | 86 float m_meteringGain; |
| 86 | 87 |
| 87 // Lookahead section. | 88 // Lookahead section. |
| 88 enum { MaxPreDelayFrames = 1024 }; | 89 enum { MaxPreDelayFrames = 1024 }; |
| 89 enum { MaxPreDelayFramesMask = MaxPreDelayFrames - 1 }; | 90 enum { MaxPreDelayFramesMask = MaxPreDelayFrames - 1 }; |
| 90 enum { DefaultPreDelayFrames = 256 }; // setPreDelayTime() will override thi
s initial value | 91 enum { DefaultPreDelayFrames = 256 }; // setPreDelayTime() will override thi
s initial value |
| 91 unsigned m_lastPreDelayFrames; | 92 unsigned m_lastPreDelayFrames; |
| 92 void setPreDelayTime(float); | 93 void setPreDelayTime(float); |
| 93 | 94 |
| 94 Vector<std::unique_ptr<AudioFloatArray>> m_preDelayBuffers; | 95 Vector<OwnPtr<AudioFloatArray>> m_preDelayBuffers; |
| 95 int m_preDelayReadIndex; | 96 int m_preDelayReadIndex; |
| 96 int m_preDelayWriteIndex; | 97 int m_preDelayWriteIndex; |
| 97 | 98 |
| 98 float m_maxAttackCompressionDiffDb; | 99 float m_maxAttackCompressionDiffDb; |
| 99 | 100 |
| 100 // Static compression curve. | 101 // Static compression curve. |
| 101 float kneeCurve(float x, float k); | 102 float kneeCurve(float x, float k); |
| 102 float saturate(float x, float k); | 103 float saturate(float x, float k); |
| 103 float slopeAt(float x, float k); | 104 float slopeAt(float x, float k); |
| 104 float kAtSlope(float desiredSlope); | 105 float kAtSlope(float desiredSlope); |
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| 123 float m_kneeThresholdDb; | 124 float m_kneeThresholdDb; |
| 124 float m_ykneeThresholdDb; | 125 float m_ykneeThresholdDb; |
| 125 | 126 |
| 126 // Internal parameter for the knee portion of the curve. | 127 // Internal parameter for the knee portion of the curve. |
| 127 float m_knee; | 128 float m_knee; |
| 128 }; | 129 }; |
| 129 | 130 |
| 130 } // namespace blink | 131 } // namespace blink |
| 131 | 132 |
| 132 #endif // DynamicsCompressorKernel_h | 133 #endif // DynamicsCompressorKernel_h |
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