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 "AudioNode.h" 29#include "AudioParam.h" 30#include <memory> 31 32namespace WebCore { 33 34class DynamicsCompressor; 35 36class DynamicsCompressorNode : public AudioNode { 37public: 38 static PassRefPtr<DynamicsCompressorNode> create(AudioContext* context, float sampleRate) 39 { 40 return adoptRef(new DynamicsCompressorNode(context, sampleRate)); 41 } 42 43 virtual ~DynamicsCompressorNode(); 44 45 // AudioNode 46 virtual void process(size_t framesToProcess) override; 47 virtual void reset() override; 48 virtual void initialize() override; 49 virtual void uninitialize() override; 50 51 // Static compression curve parameters. 52 AudioParam* threshold() { return m_threshold.get(); } 53 AudioParam* knee() { return m_knee.get(); } 54 AudioParam* ratio() { return m_ratio.get(); } 55 AudioParam* attack() { return m_attack.get(); } 56 AudioParam* release() { return m_release.get(); } 57 58 // Amount by which the compressor is currently compressing the signal in decibels. 59 AudioParam* reduction() { return m_reduction.get(); } 60 61private: 62 virtual double tailTime() const override; 63 virtual double latencyTime() const override; 64 65 DynamicsCompressorNode(AudioContext*, float sampleRate); 66 67 std::unique_ptr<DynamicsCompressor> m_dynamicsCompressor; 68 RefPtr<AudioParam> m_threshold; 69 RefPtr<AudioParam> m_knee; 70 RefPtr<AudioParam> m_ratio; 71 RefPtr<AudioParam> m_reduction; 72 RefPtr<AudioParam> m_attack; 73 RefPtr<AudioParam> m_release; 74}; 75 76} // namespace WebCore 77 78#endif // DynamicsCompressorNode_h 79