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/*
Copyright 2018 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS-IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifndef RESONANCE_AUDIO_AMBISONICS_FOA_ROTATOR_H_
#define RESONANCE_AUDIO_AMBISONICS_FOA_ROTATOR_H_
#include "base/audio_buffer.h"
#include "base/spherical_angle.h"
namespace vraudio {
// Rotator for first order ambisonic soundfields. It supports ACN channel
// ordering and SN3D normalization (AmbiX).
class FoaRotator {
public:
// @param target_rotation Target rotation to be applied to the input buffer.
// @param input First order soundfield input buffer to be rotated.
// @param output Pointer to output buffer.
// @return True if rotation has been applied.
bool Process(const WorldRotation& target_rotation, const AudioBuffer& input,
AudioBuffer* output);
private:
// Method which rotates a specified chunk of data in the AudioBuffer.
//
// @param target_rotation Target rotation to be applied to the soundfield.
// @param start_location Sample index in the soundfield where the rotation
// should begin.
// @param duration Number of samples in soundfield to be rotated.
// @param input First order soundfield input buffer to be rotated.
// @param output Pointer to output buffer.
void Rotate(const WorldRotation& target_rotation, size_t start_location,
size_t duration, const AudioBuffer& input, AudioBuffer* output);
// Current rotation which is used in the interpolation process in order to
// perform a smooth rotation. Initialized with an identity matrix.
WorldRotation current_rotation_;
// Preallocation of temporary variables used during rotation.
AudioPosition temp_audio_position_;
WorldPosition temp_world_position_;
AudioPosition temp_rotated_audio_position_;
WorldPosition temp_rotated_world_position_;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_AMBISONICS_FOA_ROTATOR_H_
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