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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_PLATFORM_AUDIO_STEREO_PANNER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_STEREO_PANNER_H_
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/noncopyable.h"
namespace blink {
class AudioBus;
// Implement the equal-power panning algorithm for mono or stereo input. See:
// https://webaudio.github.io/web-audio-api/#Spatialzation-equal-power-panning
class PLATFORM_EXPORT StereoPanner {
USING_FAST_MALLOC(StereoPanner);
WTF_MAKE_NONCOPYABLE(StereoPanner);
public:
static std::unique_ptr<StereoPanner> Create(float sample_rate);
~StereoPanner() = default;
;
void PanWithSampleAccurateValues(const AudioBus* input_bus,
AudioBus* output_bus,
const float* pan_values,
size_t frames_to_process);
void PanToTargetValue(const AudioBus* input_bus,
AudioBus* output_bus,
float pan_value,
size_t frames_to_process);
private:
explicit StereoPanner(float sample_rate);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_STEREO_PANNER_H_
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