Alessio Bazzica | e63d38b | 2018-04-19 17:56:55 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #ifndef MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_ |
| 12 | #define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_ |
| 13 | |
Yves Gerey | 988cc08 | 2018-10-23 12:03:01 +0200 | [diff] [blame^] | 14 | #include <stddef.h> |
| 15 | |
Alessio Bazzica | e63d38b | 2018-04-19 17:56:55 +0200 | [diff] [blame] | 16 | #include "api/array_view.h" |
| 17 | |
| 18 | namespace webrtc { |
| 19 | namespace rnn_vad { |
| 20 | |
| 21 | // LPC inverse filter length. |
| 22 | constexpr size_t kNumLpcCoefficients = 5; |
| 23 | |
| 24 | // Given a frame |x|, computes a post-processed version of LPC coefficients |
| 25 | // tailored for pitch estimation. |
| 26 | void ComputeAndPostProcessLpcCoefficients( |
| 27 | rtc::ArrayView<const float> x, |
| 28 | rtc::ArrayView<float, kNumLpcCoefficients> lpc_coeffs); |
| 29 | |
| 30 | // Computes the LP residual for the input frame |x| and the LPC coefficients |
| 31 | // |lpc_coeffs|. |y| and |x| can point to the same array for in-place |
| 32 | // computation. |
| 33 | void ComputeLpResidual( |
| 34 | rtc::ArrayView<const float, kNumLpcCoefficients> lpc_coeffs, |
| 35 | rtc::ArrayView<const float> x, |
| 36 | rtc::ArrayView<float> y); |
| 37 | |
| 38 | } // namespace rnn_vad |
| 39 | } // namespace webrtc |
| 40 | |
| 41 | #endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_LP_RESIDUAL_H_ |