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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CONSTANT_SOURCE_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CONSTANT_SOURCE_NODE_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/modules/webaudio/audio_param.h"
#include "third_party/blink/renderer/modules/webaudio/audio_scheduled_source_node.h"
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
namespace blink {
class BaseAudioContext;
class ConstantSourceOptions;
class ExceptionState;
// ConstantSourceNode is an audio generator for a constant source
class ConstantSourceHandler final : public AudioScheduledSourceHandler {
public:
static scoped_refptr<ConstantSourceHandler> Create(AudioNode&,
float sample_rate,
AudioParamHandler& offset);
~ConstantSourceHandler() override;
// AudioHandler
void Process(uint32_t frames_to_process) override;
void HandleStoppableSourceNode() override;
private:
ConstantSourceHandler(AudioNode&,
float sample_rate,
AudioParamHandler& offset);
// If we are no longer playing, propogate silence ahead to downstream nodes.
bool PropagatesSilence() const override;
scoped_refptr<AudioParamHandler> offset_;
AudioFloatArray sample_accurate_values_;
};
class ConstantSourceNode final : public AudioScheduledSourceNode {
DEFINE_WRAPPERTYPEINFO();
public:
static ConstantSourceNode* Create(BaseAudioContext&, ExceptionState&);
static ConstantSourceNode* Create(BaseAudioContext*,
const ConstantSourceOptions*,
ExceptionState&);
ConstantSourceNode(BaseAudioContext&);
void Trace(Visitor*) const override;
AudioParam* offset();
ConstantSourceHandler& GetConstantSourceHandler() const;
// InspectorHelperMixin
void ReportDidCreate() final;
void ReportWillBeDestroyed() final;
private:
Member<AudioParam> offset_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CONSTANT_SOURCE_NODE_H_
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