chromium/third_party/webrtc/modules/audio_processing/agc2/rnn_vad/common.h

/*
 *  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_COMMON_H_
#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_

#include <stddef.h>

namespace webrtc {
namespace rnn_vad {

constexpr double kPi = …;

constexpr int kSampleRate24kHz = …;
constexpr int kFrameSize10ms24kHz = …;
constexpr int kFrameSize20ms24kHz = …;

// Pitch buffer.
constexpr int kMinPitch24kHz = …;   // 0.00125 s.
constexpr int kMaxPitch24kHz = …;  // 0.016 s.
constexpr int kBufSize24kHz = …;
static_assert …;

// 24 kHz analysis.
// Define a higher minimum pitch period for the initial search. This is used to
// avoid searching for very short periods, for which a refinement step is
// responsible.
constexpr int kInitialMinPitch24kHz = …;
static_assert …;
static_assert …;
static_assert …;
// Number of (inverted) lags during the initial pitch search phase at 24 kHz.
constexpr int kInitialNumLags24kHz = …;
// Number of (inverted) lags during the pitch search refinement phase at 24 kHz.
constexpr int kRefineNumLags24kHz = …;
static_assert …;

// 12 kHz analysis.
constexpr int kSampleRate12kHz = …;
constexpr int kFrameSize10ms12kHz = …;
constexpr int kFrameSize20ms12kHz = …;
constexpr int kBufSize12kHz = …;
constexpr int kInitialMinPitch12kHz = …;
constexpr int kMaxPitch12kHz = …;
static_assert …;
// The inverted lags for the pitch interval [`kInitialMinPitch12kHz`,
// `kMaxPitch12kHz`] are in the range [0, `kNumLags12kHz`].
constexpr int kNumLags12kHz = …;

// 48 kHz constants.
constexpr int kMinPitch48kHz = …;
constexpr int kMaxPitch48kHz = …;

// Spectral features.
constexpr int kNumBands = …;
constexpr int kNumLowerBands = …;
static_assert …;
constexpr int kCepstralCoeffsHistorySize = …;
static_assert …;

constexpr int kFeatureVectorSize = …;

}  // namespace rnn_vad
}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_