c6abf6cd3f
Some API deprecation -- ExperimentalAgc and ExperimentalNs are gone. We're continuing to carry iSAC even though it's gone upstream, but maybe we'll want to drop that soon.
78 lines
3.1 KiB
C++
78 lines
3.1 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_COMMON_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_
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#include <stddef.h>
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namespace webrtc {
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namespace rnn_vad {
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constexpr double kPi = 3.14159265358979323846;
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constexpr int kSampleRate24kHz = 24000;
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constexpr int kFrameSize10ms24kHz = kSampleRate24kHz / 100;
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constexpr int kFrameSize20ms24kHz = kFrameSize10ms24kHz * 2;
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// Pitch buffer.
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constexpr int kMinPitch24kHz = kSampleRate24kHz / 800; // 0.00125 s.
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constexpr int kMaxPitch24kHz = kSampleRate24kHz / 62.5; // 0.016 s.
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constexpr int kBufSize24kHz = kMaxPitch24kHz + kFrameSize20ms24kHz;
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static_assert((kBufSize24kHz & 1) == 0, "The buffer size must be even.");
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// 24 kHz analysis.
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// Define a higher minimum pitch period for the initial search. This is used to
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// avoid searching for very short periods, for which a refinement step is
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// responsible.
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constexpr int kInitialMinPitch24kHz = 3 * kMinPitch24kHz;
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static_assert(kMinPitch24kHz < kInitialMinPitch24kHz, "");
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static_assert(kInitialMinPitch24kHz < kMaxPitch24kHz, "");
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static_assert(kMaxPitch24kHz > kInitialMinPitch24kHz, "");
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// Number of (inverted) lags during the initial pitch search phase at 24 kHz.
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constexpr int kInitialNumLags24kHz = kMaxPitch24kHz - kInitialMinPitch24kHz;
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// Number of (inverted) lags during the pitch search refinement phase at 24 kHz.
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constexpr int kRefineNumLags24kHz = kMaxPitch24kHz + 1;
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static_assert(
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kRefineNumLags24kHz > kInitialNumLags24kHz,
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"The refinement step must search the pitch in an extended pitch range.");
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// 12 kHz analysis.
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constexpr int kSampleRate12kHz = 12000;
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constexpr int kFrameSize10ms12kHz = kSampleRate12kHz / 100;
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constexpr int kFrameSize20ms12kHz = kFrameSize10ms12kHz * 2;
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constexpr int kBufSize12kHz = kBufSize24kHz / 2;
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constexpr int kInitialMinPitch12kHz = kInitialMinPitch24kHz / 2;
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constexpr int kMaxPitch12kHz = kMaxPitch24kHz / 2;
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static_assert(kMaxPitch12kHz > kInitialMinPitch12kHz, "");
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// The inverted lags for the pitch interval [`kInitialMinPitch12kHz`,
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// `kMaxPitch12kHz`] are in the range [0, `kNumLags12kHz`].
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constexpr int kNumLags12kHz = kMaxPitch12kHz - kInitialMinPitch12kHz;
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// 48 kHz constants.
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constexpr int kMinPitch48kHz = kMinPitch24kHz * 2;
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constexpr int kMaxPitch48kHz = kMaxPitch24kHz * 2;
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// Spectral features.
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constexpr int kNumBands = 22;
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constexpr int kNumLowerBands = 6;
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static_assert((0 < kNumLowerBands) && (kNumLowerBands < kNumBands), "");
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constexpr int kCepstralCoeffsHistorySize = 8;
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static_assert(kCepstralCoeffsHistorySize > 2,
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"The history size must at least be 3 to compute first and second "
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"derivatives.");
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constexpr int kFeatureVectorSize = 42;
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} // namespace rnn_vad
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_
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