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f622ba725e
Motivation: read "On Unsigned Integers" section in https://google.github.io/styleguide/cppguide.html#Integer_Types Plus, improved readability by getting rid of a bunch of `static_cast<int>`s. Bug: webrtc:10480 Change-Id: I911aa8cd08f5ccde4ee6f23534240d1faa84cdea Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/190880 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32524}
79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SEQUENCE_BUFFER_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SEQUENCE_BUFFER_H_
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#include <algorithm>
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#include <cstring>
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#include <type_traits>
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#include <vector>
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#include "api/array_view.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace rnn_vad {
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// Linear buffer implementation to (i) push fixed size chunks of sequential data
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// and (ii) view contiguous parts of the buffer. The buffer and the pushed
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// chunks have size S and N respectively. For instance, when S = 2N the first
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// half of the sequence buffer is replaced with its second half, and the new N
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// values are written at the end of the buffer.
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// The class also provides a view on the most recent M values, where 0 < M <= S
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// and by default M = N.
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template <typename T, int S, int N, int M = N>
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class SequenceBuffer {
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static_assert(N <= S,
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"The new chunk size cannot be larger than the sequence buffer "
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"size.");
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static_assert(std::is_arithmetic<T>::value,
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"Integral or floating point required.");
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public:
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SequenceBuffer() : buffer_(S) {
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RTC_DCHECK_EQ(S, buffer_.size());
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Reset();
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}
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SequenceBuffer(const SequenceBuffer&) = delete;
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SequenceBuffer& operator=(const SequenceBuffer&) = delete;
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~SequenceBuffer() = default;
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int size() const { return S; }
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int chunks_size() const { return N; }
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// Sets the sequence buffer values to zero.
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void Reset() { std::fill(buffer_.begin(), buffer_.end(), 0); }
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// Returns a view on the whole buffer.
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rtc::ArrayView<const T, S> GetBufferView() const {
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return {buffer_.data(), S};
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}
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// Returns a view on the M most recent values of the buffer.
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rtc::ArrayView<const T, M> GetMostRecentValuesView() const {
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static_assert(M <= S,
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"The number of most recent values cannot be larger than the "
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"sequence buffer size.");
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return {buffer_.data() + S - M, M};
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}
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// Shifts left the buffer by N items and add new N items at the end.
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void Push(rtc::ArrayView<const T, N> new_values) {
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// Make space for the new values.
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if (S > N)
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std::memmove(buffer_.data(), buffer_.data() + N, (S - N) * sizeof(T));
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// Copy the new values at the end of the buffer.
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std::memcpy(buffer_.data() + S - N, new_values.data(), N * sizeof(T));
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}
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private:
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std::vector<T> buffer_;
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};
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} // namespace rnn_vad
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SEQUENCE_BUFFER_H_
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