1 /* 2 * Copyright (C) 2011, Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #ifndef DynamicsCompressorNode_h 26 #define DynamicsCompressorNode_h 27 28 #include "modules/webaudio/AudioNode.h" 29 #include "modules/webaudio/AudioParam.h" 30 #include "wtf/OwnPtr.h" 31 32 namespace WebCore { 33 34 class DynamicsCompressor; 35 36 class DynamicsCompressorNode FINAL : public AudioNode { 37 public: create(AudioContext * context,float sampleRate)38 static PassRefPtrWillBeRawPtr<DynamicsCompressorNode> create(AudioContext* context, float sampleRate) 39 { 40 return adoptRefWillBeNoop(new DynamicsCompressorNode(context, sampleRate)); 41 } 42 43 virtual ~DynamicsCompressorNode(); 44 45 // AudioNode 46 virtual void process(size_t framesToProcess) OVERRIDE; 47 virtual void initialize() OVERRIDE; 48 virtual void uninitialize() OVERRIDE; 49 50 // Static compression curve parameters. threshold()51 AudioParam* threshold() { return m_threshold.get(); } knee()52 AudioParam* knee() { return m_knee.get(); } ratio()53 AudioParam* ratio() { return m_ratio.get(); } attack()54 AudioParam* attack() { return m_attack.get(); } release()55 AudioParam* release() { return m_release.get(); } 56 57 // Amount by which the compressor is currently compressing the signal in decibels. reduction()58 AudioParam* reduction() { return m_reduction.get(); } 59 60 virtual void trace(Visitor*) OVERRIDE; 61 62 private: 63 virtual double tailTime() const OVERRIDE; 64 virtual double latencyTime() const OVERRIDE; 65 66 DynamicsCompressorNode(AudioContext*, float sampleRate); 67 68 OwnPtr<DynamicsCompressor> m_dynamicsCompressor; 69 RefPtrWillBeMember<AudioParam> m_threshold; 70 RefPtrWillBeMember<AudioParam> m_knee; 71 RefPtrWillBeMember<AudioParam> m_ratio; 72 RefPtrWillBeMember<AudioParam> m_reduction; 73 RefPtrWillBeMember<AudioParam> m_attack; 74 RefPtrWillBeMember<AudioParam> m_release; 75 }; 76 77 } // namespace WebCore 78 79 #endif // DynamicsCompressorNode_h 80