bcec8b0b21
This is from the upstream library commit id 3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium 88.0.4290.1.
57 lines
2.2 KiB
C++
57 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/audio_processing/agc2/rnn_vad/pitch_search.h"
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#include <array>
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#include <cstddef>
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace rnn_vad {
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PitchEstimator::PitchEstimator()
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: pitch_buf_decimated_(kBufSize12kHz),
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pitch_buf_decimated_view_(pitch_buf_decimated_.data(), kBufSize12kHz),
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auto_corr_(kNumInvertedLags12kHz),
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auto_corr_view_(auto_corr_.data(), kNumInvertedLags12kHz) {
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RTC_DCHECK_EQ(kBufSize12kHz, pitch_buf_decimated_.size());
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RTC_DCHECK_EQ(kNumInvertedLags12kHz, auto_corr_view_.size());
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}
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PitchEstimator::~PitchEstimator() = default;
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PitchInfo PitchEstimator::Estimate(
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rtc::ArrayView<const float, kBufSize24kHz> pitch_buf) {
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// Perform the initial pitch search at 12 kHz.
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Decimate2x(pitch_buf, pitch_buf_decimated_view_);
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auto_corr_calculator_.ComputeOnPitchBuffer(pitch_buf_decimated_view_,
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auto_corr_view_);
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std::array<size_t, 2> pitch_candidates_inv_lags = FindBestPitchPeriods(
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auto_corr_view_, pitch_buf_decimated_view_, kMaxPitch12kHz);
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// Refine the pitch period estimation.
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// The refinement is done using the pitch buffer that contains 24 kHz samples.
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// Therefore, adapt the inverted lags in |pitch_candidates_inv_lags| from 12
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// to 24 kHz.
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pitch_candidates_inv_lags[0] *= 2;
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pitch_candidates_inv_lags[1] *= 2;
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size_t pitch_inv_lag_48kHz =
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RefinePitchPeriod48kHz(pitch_buf, pitch_candidates_inv_lags);
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// Look for stronger harmonics to find the final pitch period and its gain.
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RTC_DCHECK_LT(pitch_inv_lag_48kHz, kMaxPitch48kHz);
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last_pitch_48kHz_ = CheckLowerPitchPeriodsAndComputePitchGain(
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pitch_buf, kMaxPitch48kHz - pitch_inv_lag_48kHz, last_pitch_48kHz_);
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return last_pitch_48kHz_;
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}
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} // namespace rnn_vad
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} // namespace webrtc
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