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// Copyright 2014 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_STEREO_PANNER_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_STEREO_PANNER_NODE_H_
#include <memory>
#include "base/gtest_prod_util.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/audio/audio_bus.h"
#include "third_party/blink/renderer/platform/audio/stereo_panner.h"
namespace blink {
class BaseAudioContext;
class StereoPannerOptions;
// StereoPannerNode is an AudioNode with one input and one output. It is
// specifically designed for equal-power stereo panning.
class StereoPannerHandler final : public AudioHandler {
public:
static scoped_refptr<StereoPannerHandler> Create(AudioNode&,
float sample_rate,
AudioParamHandler& pan);
~StereoPannerHandler() override;
void Process(uint32_t frames_to_process) override;
void ProcessOnlyAudioParams(uint32_t frames_to_process) override;
void Initialize() override;
void SetChannelCount(unsigned, ExceptionState&) final;
void SetChannelCountMode(const String&, ExceptionState&) final;
double TailTime() const override { return 0; }
double LatencyTime() const override { return 0; }
bool RequiresTailProcessing() const final { return false; }
private:
StereoPannerHandler(AudioNode&, float sample_rate, AudioParamHandler& pan);
std::unique_ptr<StereoPanner> stereo_panner_;
scoped_refptr<AudioParamHandler> pan_;
AudioFloatArray sample_accurate_pan_values_;
FRIEND_TEST_ALL_PREFIXES(StereoPannerNodeTest, StereoPannerLifetime);
};
class StereoPannerNode final : public AudioNode {
DEFINE_WRAPPERTYPEINFO();
public:
static StereoPannerNode* Create(BaseAudioContext&, ExceptionState&);
static StereoPannerNode* Create(BaseAudioContext*,
const StereoPannerOptions*,
ExceptionState&);
StereoPannerNode(BaseAudioContext&);
void Trace(Visitor*) const override;
AudioParam* pan() const;
// InspectorHelperMixin
void ReportDidCreate() final;
void ReportWillBeDestroyed() final;
private:
Member<AudioParam> pan_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_STEREO_PANNER_NODE_H_
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