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/*
* Copyright (C) 2010, Google 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_GAIN_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_GAIN_NODE_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node.h"
#include "third_party/blink/renderer/modules/webaudio/audio_param.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
namespace blink {
class BaseAudioContext;
class GainOptions;
// GainNode is an AudioNode with one input and one output which applies a gain
// (volume) change to the audio signal. De-zippering (smoothing) is applied
// when the gain value is changed dynamically.
class GainHandler final : public AudioHandler {
public:
static scoped_refptr<GainHandler> Create(AudioNode&,
float sample_rate,
AudioParamHandler& gain);
// AudioHandler
void Process(uint32_t frames_to_process) override;
void ProcessOnlyAudioParams(uint32_t frames_to_process) override;
// Called in the main thread when the number of channels for the input may
// have changed.
void CheckNumberOfChannelsForInput(AudioNodeInput*) override;
// AudioNode
double TailTime() const override { return 0; }
double LatencyTime() const override { return 0; }
bool RequiresTailProcessing() const final { return false; }
private:
GainHandler(AudioNode&, float sample_rate, AudioParamHandler& gain);
scoped_refptr<AudioParamHandler> gain_;
AudioFloatArray sample_accurate_gain_values_;
};
class GainNode final : public AudioNode {
DEFINE_WRAPPERTYPEINFO();
public:
static GainNode* Create(BaseAudioContext&, ExceptionState&);
static GainNode* Create(BaseAudioContext*,
const GainOptions*,
ExceptionState&);
GainNode(BaseAudioContext&);
void Trace(Visitor*) const override;
AudioParam* gain() const;
// InspectorHelperMixin
void ReportDidCreate() final;
void ReportWillBeDestroyed() final;
private:
Member<AudioParam> gain_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_GAIN_NODE_H_
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