File: stereo_panner.h

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// Copyright 2014 The Chromium Authors
// 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/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 final {
  USING_FAST_MALLOC(StereoPanner);

 public:
  explicit StereoPanner(float sample_rate);
  StereoPanner(const StereoPanner&) = delete;
  StereoPanner& operator=(const StereoPanner&) = delete;
  ~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);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_STEREO_PANNER_H_