| /* |
| * 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_SEQUENCE_BUFFER_H_ |
| #define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SEQUENCE_BUFFER_H_ |
| |
| #include <array> |
| #include <cstring> |
| #include <type_traits> |
| |
| #include "api/array_view.h" |
| #include "rtc_base/checks.h" |
| |
| namespace webrtc { |
| namespace rnn_vad { |
| |
| // Linear buffer implementation to (i) push fixed size chunks of sequential data |
| // and (ii) view contiguous parts of the buffer. The buffer and the pushed |
| // chunks have size S and N respectively. For instance, when S = 2N the first |
| // half of the sequence buffer is replaced with its second half, and the new N |
| // values are written at the end of the buffer. |
| template <typename T, size_t S, size_t N> |
| class SequenceBuffer { |
| static_assert(S >= N, |
| "The new chunk size is larger than the sequence buffer size."); |
| static_assert(std::is_arithmetic<T>::value, |
| "Integral or floating point required."); |
| |
| public: |
| SequenceBuffer() { buffer_.fill(0); } |
| SequenceBuffer(const SequenceBuffer&) = delete; |
| SequenceBuffer& operator=(const SequenceBuffer&) = delete; |
| ~SequenceBuffer() = default; |
| size_t size() const { return S; } |
| size_t chunks_size() const { return N; } |
| // Sets the sequence buffer values to zero. |
| void Reset() { buffer_.fill(0); } |
| // Returns a view on the whole buffer. |
| rtc::ArrayView<const T, S> GetBufferView() const { |
| return {buffer_.data(), S}; |
| } |
| // Returns a view on part of the buffer; the first element starts at the given |
| // offset and the last one is the last one in the buffer. |
| rtc::ArrayView<const T> GetBufferView(int offset) const { |
| RTC_DCHECK_LE(0, offset); |
| RTC_DCHECK_LT(offset, S); |
| return {buffer_.data() + offset, S - offset}; |
| } |
| // Returns a view on part of the buffer; the first element starts at the given |
| // offset and the size of the view is |size|. |
| rtc::ArrayView<const T> GetBufferView(int offset, size_t size) const { |
| RTC_DCHECK_LE(0, offset); |
| RTC_DCHECK_LT(offset, S); |
| RTC_DCHECK_LT(0, size); |
| RTC_DCHECK_LE(size, S - offset); |
| return {buffer_.data() + offset, size}; |
| } |
| // Shifts left the buffer by N items and add new N items at the end. |
| void Push(rtc::ArrayView<const T, N> new_values) { |
| // Make space for the new values. |
| if (S > N) |
| std::memmove(buffer_.data(), buffer_.data() + N, (S - N) * sizeof(T)); |
| // Copy the new values at the end of the buffer. |
| std::memcpy(buffer_.data() + S - N, new_values.data(), N * sizeof(T)); |
| } |
| |
| private: |
| std::array<T, S> buffer_; |
| }; |
| |
| } // namespace rnn_vad |
| } // namespace webrtc |
| |
| #endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SEQUENCE_BUFFER_H_ |