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/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_PROCESSING_AGC2_SATURATION_PROTECTOR_BUFFER_H_
#define MODULES_AUDIO_PROCESSING_AGC2_SATURATION_PROTECTOR_BUFFER_H_
#include <array>
#include "absl/types/optional.h"
#include "modules/audio_processing/agc2/agc2_common.h"
namespace webrtc {
// Ring buffer for the saturation protector which only supports (i) push back
// and (ii) read oldest item.
class SaturationProtectorBuffer {
public:
SaturationProtectorBuffer();
~SaturationProtectorBuffer();
bool operator==(const SaturationProtectorBuffer& b) const;
inline bool operator!=(const SaturationProtectorBuffer& b) const {
return !(*this == b);
}
// Maximum number of values that the buffer can contain.
int Capacity() const;
// Number of values in the buffer.
int Size() const;
void Reset();
// Pushes back `v`. If the buffer is full, the oldest value is replaced.
void PushBack(float v);
// Returns the oldest item in the buffer. Returns an empty value if the
// buffer is empty.
absl::optional<float> Front() const;
private:
int FrontIndex() const;
// `buffer_` has `size_` elements (up to the size of `buffer_`) and `next_` is
// the position where the next new value is written in `buffer_`.
std::array<float, kSaturationProtectorBufferSize> buffer_;
int next_ = 0;
int size_ = 0;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AGC2_SATURATION_PROTECTOR_BUFFER_H_
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