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Diffstat (limited to 'third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/lp_residual.h')
-rw-r--r-- | third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/lp_residual.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/lp_residual.h b/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/lp_residual.h new file mode 100644 index 0000000000..d04c536ec1 --- /dev/null +++ b/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/lp_residual.h @@ -0,0 +1,41 @@ +/* + * 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( + 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_ |