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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_LP_RESIDUAL_H_
#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_
#include <stddef.h>
#include "api/array_view.h"
namespace webrtc {
namespace rnn_vad {
// Linear predictive coding (LPC) inverse filter length.
constexpr int kNumLpcCoefficients = 5;
// Given a frame `x`, computes a post-processed version of LPC coefficients
// tailored for pitch estimation.
void ComputeAndPostProcessLpcCoefficients(
ArrayView<const float> x,
ArrayView<float, kNumLpcCoefficients> lpc_coeffs);
// Computes the LP residual for the input frame `x` and the LPC coefficients
// `lpc_coeffs`. `y` and `x` can point to the same array for in-place
// computation.
void ComputeLpResidual(ArrayView<const float, kNumLpcCoefficients> lpc_coeffs,
ArrayView<const float> x,
ArrayView<float> y);
} // namespace rnn_vad
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_
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