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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
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_AMBISONIC_CODEC_H_
#define RESONANCE_AUDIO_AMBISONICS_AMBISONIC_CODEC_H_
#include <vector>
#include "base/audio_buffer.h"
#include "base/spherical_angle.h"
namespace vraudio {
// An encoder/decoder for ambisonic sound fields. It supports variable ambisonic
// order, ACN channel sequencing and SN3D normalization.
class AmbisonicCodec {
public:
virtual ~AmbisonicCodec() {}
// Encodes the given buffer of decoded vectors (unencoded data).
//
// @param input |AudioBuffer| of decoded (unencoded) data.
// @param output |AudioBuffer| to store the encoded data.
virtual void EncodeBuffer(const AudioBuffer& input, AudioBuffer* output) = 0;
// Decodes the given |AudioBuffer| of planar (non-interleaved) encoded data.
//
// @param input |AudioBuffer| of encoded data.
// @param output |AudioBuffer| to store the decoded data.
virtual void DecodeBuffer(const AudioBuffer& input, AudioBuffer* output) = 0;
// Returns the maximum periphonic ambisonic order that this codec supports.
virtual int ambisonic_order() const = 0;
// Returns the number of angles for this codec.
virtual size_t num_angles() const = 0;
// Returns the maximum number of spherical harmonics computed by this codec.
virtual size_t num_spherical_harmonics() const = 0;
// Returns the spherical angles currently used to define the encoder/decoder
// matrices.
virtual const std::vector<SphericalAngle>& angles() const = 0;
// Sets the spherical angles used to build the encoder/decoder matrices.
virtual void set_angles(const std::vector<SphericalAngle>& angles) = 0;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_AMBISONICS_AMBISONIC_CODEC_H_