blob: 49dbdacd9da6c269fe533aaec6156cc5e05eb622 [file] [log] [blame]
// 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 "base/macros.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.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);
public:
explicit StereoPanner(float sample_rate);
~StereoPanner() = default;
void PanWithSampleAccurateValues(const AudioBus* input_bus,
AudioBus* output_bus,
const float* pan_values,
uint32_t frames_to_process);
void PanToTargetValue(const AudioBus* input_bus,
AudioBus* output_bus,
float pan_value,
uint32_t frames_to_process);
private:
DISALLOW_COPY_AND_ASSIGN(StereoPanner);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_STEREO_PANNER_H_