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0b489303d2
Bug: webrtc:12338 Change-Id: I85bff694dd2ead83c939c4d1945eff82e1296001 No-Presubmit: True Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227161 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34690}
41 lines
1.4 KiB
C++
41 lines
1.4 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_LP_RESIDUAL_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_
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#include <stddef.h>
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#include "api/array_view.h"
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namespace webrtc {
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namespace rnn_vad {
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// Linear predictive coding (LPC) inverse filter length.
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constexpr int kNumLpcCoefficients = 5;
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// Given a frame `x`, computes a post-processed version of LPC coefficients
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// tailored for pitch estimation.
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void ComputeAndPostProcessLpcCoefficients(
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rtc::ArrayView<const float> x,
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rtc::ArrayView<float, kNumLpcCoefficients> lpc_coeffs);
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// Computes the LP residual for the input frame `x` and the LPC coefficients
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// `lpc_coeffs`. `y` and `x` can point to the same array for in-place
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// computation.
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void ComputeLpResidual(
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rtc::ArrayView<const float, kNumLpcCoefficients> lpc_coeffs,
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rtc::ArrayView<const float> x,
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rtc::ArrayView<float> y);
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} // namespace rnn_vad
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_
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