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/*
* Copyright (C) 2010, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_EQUAL_POWER_PANNER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_EQUAL_POWER_PANNER_H_
#include "base/containers/span.h"
#include "third_party/blink/renderer/platform/audio/panner.h"
namespace blink {
// Common type of stereo panner as found in normal audio mixing equipment.
class EqualPowerPanner final : public Panner {
public:
explicit EqualPowerPanner(float sample_rate);
void Pan(double azimuth,
double elevation,
const AudioBus* input_bus,
AudioBus* output_buf,
uint32_t frames_to_process,
AudioBus::ChannelInterpretation) override;
void PanWithSampleAccurateValues(base::span<double> azimuth,
base::span<double> elevation,
const AudioBus* input_bus,
AudioBus* output_bus,
uint32_t frames_to_process,
AudioBus::ChannelInterpretation) override;
void Reset() override {}
double TailTime() const override { return 0; }
double LatencyTime() const override { return 0; }
bool RequiresTailProcessing() const override { return false; }
private:
void CalculateDesiredGain(double& desired_gain_l,
double& desired_gain_r,
double azimuth,
int number_of_input_channels);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_EQUAL_POWER_PANNER_H_
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