/* * Copyright (C) 2011, Google Inc. All rights reserved. * Copyright (C) 2020, Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #include "AudioNode.h" #include "AudioParam.h" #include "DynamicsCompressorOptions.h" #include <memory> namespace WebCore { class DynamicsCompressor; class DynamicsCompressorNode : public AudioNode { WTF_MAKE_ISO_ALLOCATED(DynamicsCompressorNode); public: static ExceptionOr<Ref<DynamicsCompressorNode>> create(BaseAudioContext&, const DynamicsCompressorOptions& = { }); virtual ~DynamicsCompressorNode(); // AudioNode void process(size_t framesToProcess) override; void reset() override; void initialize() override; void uninitialize() override; // Static compression curve parameters. AudioParam& threshold() { return m_threshold.get(); } AudioParam& knee() { return m_knee.get(); } AudioParam& ratio() { return m_ratio.get(); } AudioParam& attack() { return m_attack.get(); } AudioParam& release() { return m_release.get(); } // Amount by which the compressor is currently compressing the signal in decibels. float reduction() const { return m_reduction; } ExceptionOr<void> setChannelCount(unsigned) final; ExceptionOr<void> setChannelCountMode(ChannelCountMode) final; protected: explicit DynamicsCompressorNode(BaseAudioContext&, const DynamicsCompressorOptions& = { }); virtual void setReduction(float reduction) { m_reduction = reduction; } private: double tailTime() const override; double latencyTime() const override; std::unique_ptr<DynamicsCompressor> m_dynamicsCompressor; Ref<AudioParam> m_threshold; Ref<AudioParam> m_knee; Ref<AudioParam> m_ratio; Ref<AudioParam> m_attack; Ref<AudioParam> m_release; float m_reduction { 0 }; }; } // namespace WebCore