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741daaf039
Bug: webrtc:10138 Change-Id: Icc25a2a277a9608701aaddd546882366739991ca Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/127898 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27227}
66 lines
2.6 KiB
C++
66 lines
2.6 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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#ifndef MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SPECTRAL_FEATURES_INTERNAL_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SPECTRAL_FEATURES_INTERNAL_H_
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#include <stddef.h>
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#include <array>
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#include <complex>
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#include "api/array_view.h"
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#include "api/function_view.h"
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#include "modules/audio_processing/agc2/rnn_vad/common.h"
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namespace webrtc {
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namespace rnn_vad {
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// Computes FFT boundary indexes corresponding to sub-bands.
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std::array<size_t, kNumBands> ComputeBandBoundaryIndexes(
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size_t sample_rate_hz,
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size_t frame_size_samples);
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// Iterates through frequency bands and computes coefficients via |functor| for
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// triangular bands with peak response at each band boundary. |functor| returns
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// a floating point value for the FFT coefficient having index equal to the
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// argument passed to |functor|; that argument is in the range {0, ...
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// |max_freq_bin_index| - 1}.
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void ComputeBandCoefficients(
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rtc::FunctionView<float(size_t)> functor,
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rtc::ArrayView<const size_t, kNumBands> band_boundaries,
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const size_t max_freq_bin_index,
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rtc::ArrayView<float, kNumBands> coefficients);
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// Given an array of FFT coefficients and a vector of band boundary indexes,
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// computes band energy coefficients.
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void ComputeBandEnergies(
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rtc::ArrayView<const std::complex<float>> fft_coeffs,
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rtc::ArrayView<const size_t, kNumBands> band_boundaries,
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rtc::ArrayView<float, kNumBands> band_energies);
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// Computes log band energy coefficients.
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void ComputeLogBandEnergiesCoefficients(
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rtc::ArrayView<const float, kNumBands> band_energy_coeffs,
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rtc::ArrayView<float, kNumBands> log_band_energy_coeffs);
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// Creates a DCT table for arrays having size equal to |kNumBands|.
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std::array<float, kNumBands * kNumBands> ComputeDctTable();
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// Computes DCT for |in| given a pre-computed DCT table. In-place computation is
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// not allowed and |out| can be smaller than |in| in order to only compute the
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// first DCT coefficients.
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void ComputeDct(rtc::ArrayView<const float, kNumBands> in,
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rtc::ArrayView<const float, kNumBands * kNumBands> dct_table,
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rtc::ArrayView<float> out);
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} // namespace rnn_vad
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SPECTRAL_FEATURES_INTERNAL_H_
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