66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
/*
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* Copyright (C) 2010, Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "AudioNode.h"
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#include "AudioParam.h"
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#include "GainOptions.h"
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#include <wtf/Threading.h>
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namespace WebCore {
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class AudioContext;
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// GainNode is an AudioNode with one input and one output which applies a gain (volume) change to the audio signal.
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// De-zippering (smoothing) is applied when the gain value is changed dynamically.
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class GainNode final : public AudioNode {
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WTF_MAKE_ISO_ALLOCATED(GainNode);
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public:
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static ExceptionOr<Ref<GainNode>> create(BaseAudioContext& context, const GainOptions& = { });
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// AudioNode
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void process(size_t framesToProcess) override;
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void processOnlyAudioParams(size_t framesToProcess) final;
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// Called in the main thread when the number of channels for the input may have changed.
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void checkNumberOfChannelsForInput(AudioNodeInput*) override;
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// JavaScript interface
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AudioParam& gain() { return m_gain.get(); }
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private:
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double tailTime() const override { return 0; }
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double latencyTime() const override { return 0; }
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bool requiresTailProcessing() const final { return false; }
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explicit GainNode(BaseAudioContext&);
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AudioFloatArray m_sampleAccurateGainValues;
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Ref<AudioParam> m_gain;
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};
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} // namespace WebCore
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