1 /* 2 * Copyright (c) 2019 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_AUTO_CORRELATION_H_ 12 #define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_AUTO_CORRELATION_H_ 13 14 #include <memory> 15 16 #include "api/array_view.h" 17 #include "modules/audio_processing/agc2/rnn_vad/common.h" 18 #include "modules/audio_processing/utility/pffft_wrapper.h" 19 20 namespace webrtc { 21 namespace rnn_vad { 22 23 // Class to compute the auto correlation on the pitch buffer for a target pitch 24 // interval. 25 class AutoCorrelationCalculator { 26 public: 27 AutoCorrelationCalculator(); 28 AutoCorrelationCalculator(const AutoCorrelationCalculator&) = delete; 29 AutoCorrelationCalculator& operator=(const AutoCorrelationCalculator&) = 30 delete; 31 ~AutoCorrelationCalculator(); 32 33 // Computes the auto-correlation coefficients for a target pitch interval. 34 // `auto_corr` indexes are inverted lags. 35 void ComputeOnPitchBuffer( 36 rtc::ArrayView<const float, kBufSize12kHz> pitch_buf, 37 rtc::ArrayView<float, kNumLags12kHz> auto_corr); 38 39 private: 40 Pffft fft_; 41 std::unique_ptr<Pffft::FloatBuffer> tmp_; 42 std::unique_ptr<Pffft::FloatBuffer> X_; 43 std::unique_ptr<Pffft::FloatBuffer> H_; 44 }; 45 46 } // namespace rnn_vad 47 } // namespace webrtc 48 49 #endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_AUTO_CORRELATION_H_ 50