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/*
* Copyright (c) 2018 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_RNN_VAD_RING_BUFFER_H_
#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_RING_BUFFER_H_
#include <array>
#include <cstring>
#include <type_traits>
#include "api/array_view.h"
namespace webrtc {
namespace rnn_vad {
// Ring buffer for N arrays of type T each one with size S.
template <typename T, int S, int N>
class RingBuffer {
static_assert(S > 0, "");
static_assert(N > 0, "");
static_assert(std::is_arithmetic<T>::value,
"Integral or floating point required.");
public:
RingBuffer() : tail_(0) {}
RingBuffer(const RingBuffer&) = delete;
RingBuffer& operator=(const RingBuffer&) = delete;
~RingBuffer() = default;
// Set the ring buffer values to zero.
void Reset() { buffer_.fill(0); }
// Replace the least recently pushed array in the buffer with `new_values`.
void Push(ArrayView<const T, S> new_values) {
std::memcpy(buffer_.data() + S * tail_, new_values.data(), S * sizeof(T));
tail_ += 1;
if (tail_ == N)
tail_ = 0;
}
// Return an array view onto the array with a given delay. A view on the last
// and least recently push array is returned when `delay` is 0 and N - 1
// respectively.
ArrayView<const T, S> GetArrayView(int delay) const {
RTC_DCHECK_LE(0, delay);
RTC_DCHECK_LT(delay, N);
int offset = tail_ - 1 - delay;
if (offset < 0)
offset += N;
return {buffer_.data() + S * offset, S};
}
private:
int tail_; // Index of the least recently pushed sub-array.
std::array<T, S * N> buffer_{};
};
} // namespace rnn_vad
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_RING_BUFFER_H_
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