chromium/third_party/webrtc/modules/audio_processing/agc2/agc2_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_AGC2_COMMON_H_
#define MODULES_AUDIO_PROCESSING_AGC2_AGC2_COMMON_H_

namespace webrtc {

constexpr float kMinFloatS16Value = …;
constexpr float kMaxFloatS16Value = …;
constexpr float kMaxAbsFloatS16Value = …;

// Minimum audio level in dBFS scale for S16 samples.
constexpr float kMinLevelDbfs = …;

constexpr int kFrameDurationMs = …;
constexpr int kSubFramesInFrame = …;
constexpr int kMaximalNumberOfSamplesPerChannel = …;

// Adaptive digital gain applier settings.

// At what limiter levels should we start decreasing the adaptive digital gain.
constexpr float kLimiterThresholdForAgcGainDbfs = …;

// Number of milliseconds to wait to periodically reset the VAD.
constexpr int kVadResetPeriodMs = …;

// Speech probability threshold to detect speech activity.
constexpr float kVadConfidenceThreshold = …;

// Minimum number of adjacent speech frames having a sufficiently high speech
// probability to reliably detect speech activity.
constexpr int kAdjacentSpeechFramesThreshold = …;

// Number of milliseconds of speech frames to observe to make the estimator
// confident.
constexpr float kLevelEstimatorTimeToConfidenceMs = …;
constexpr float kLevelEstimatorLeakFactor = …;

// Saturation Protector settings.
constexpr float kSaturationProtectorInitialHeadroomDb = …;
constexpr int kSaturationProtectorBufferSize = …;

// Number of interpolation points for each region of the limiter.
// These values have been tuned to limit the interpolated gain curve error given
// the limiter parameters and allowing a maximum error of +/- 32768^-1.
constexpr int kInterpolatedGainCurveKneePoints = …;
constexpr int kInterpolatedGainCurveBeyondKneePoints = …;
constexpr int kInterpolatedGainCurveTotalPoints = …;

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_AGC2_AGC2_COMMON_H_