bc0b37c08a
This CL defines SpectralFeaturesExtractor which is responsible for computing the spectral features used as input for the RNN. Bug: webrtc:9076 Change-Id: I5e1396b89eca9c13bb268e8419a16436a9c3450f Reviewed-on: https://webrtc-review.googlesource.com/73760 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Alex Loiko <aleloi@webrtc.org> Reviewed-by: Ivo Creusen <ivoc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23206}
83 lines
3.1 KiB
C++
83 lines
3.1 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 <array>
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#include <cstring>
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#include <type_traits>
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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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template <typename T, size_t S, size_t N>
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class SequenceBuffer {
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static_assert(S >= N,
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"The new chunk size is larger than the sequence buffer 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_.fill(0); }
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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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size_t size() const { return S; }
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size_t chunks_size() const { return N; }
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// Sets the sequence buffer values to zero.
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void Reset() { buffer_.fill(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 part of the buffer; the first element starts at the given
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// offset and the last one is the last one in the buffer.
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rtc::ArrayView<const T> GetBufferView(int offset) const {
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RTC_DCHECK_LE(0, offset);
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RTC_DCHECK_LT(offset, S);
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return {buffer_.data() + offset, S - offset};
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}
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// Returns a view on part of the buffer; the first element starts at the given
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// offset and the size of the view is |size|.
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rtc::ArrayView<const T> GetBufferView(int offset, size_t size) const {
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RTC_DCHECK_LE(0, offset);
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RTC_DCHECK_LT(offset, S);
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RTC_DCHECK_LT(0, size);
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RTC_DCHECK_LE(size, S - offset);
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return {buffer_.data() + offset, size};
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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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// TODO(bugs.webrtc.org/9076): Switch to std::vector to decrease stack size.
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std::array<T, S> 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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