/* * 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 = …; // Given a frame `x`, computes a post-processed version of LPC coefficients // tailored for pitch estimation. void ComputeAndPostProcessLpcCoefficients( rtc::ArrayView<const float> x, rtc::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( rtc::ArrayView<const float, kNumLpcCoefficients> lpc_coeffs, rtc::ArrayView<const float> x, rtc::ArrayView<float> y); } // namespace rnn_vad } // namespace webrtc #endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_