(caf7e6a2e) Replaced Concentus NuGet package with csproj (ensures correct System.Runtime references)
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Joonas Rikkonen
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/* Copyright (c) 2006-2011 Skype Limited. All Rights Reserved
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Ported to C# by Logan Stromberg
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Concentus.Silk
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{
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using Concentus.Common;
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using Concentus.Common.CPlusPlus;
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using Concentus.Silk.Enums;
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using Concentus.Silk.Structs;
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using System.Diagnostics;
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internal class TuningParameters
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{
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/* Decay time for EntropyCoder.BITREServoir */
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internal const int BITRESERVOIR_DECAY_TIME_MS = 500;
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/*******************/
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/* Pitch estimator */
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/*******************/
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/* Level of noise floor for whitening filter LPC analysis in pitch analysis */
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internal const float FIND_PITCH_WHITE_NOISE_FRACTION = 1e-3f;
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/* Bandwidth expansion for whitening filter in pitch analysis */
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internal const float FIND_PITCH_BANDWIDTH_EXPANSION = 0.99f;
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/*********************/
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/* Linear prediction */
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/*********************/
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/* LPC analysis regularization */
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internal const float FIND_LPC_COND_FAC = 1e-5f;
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/* LTP analysis defines */
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internal const float FIND_LTP_COND_FAC = 1e-5f;
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internal const float LTP_DAMPING = 0.05f;
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internal const float LTP_SMOOTHING = 0.1f;
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/* LTP quantization settings */
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internal const float MU_LTP_QUANT_NB = 0.03f;
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internal const float MU_LTP_QUANT_MB = 0.025f;
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internal const float MU_LTP_QUANT_WB = 0.02f;
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/* Max cumulative LTP gain */
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internal const float MAX_SUM_LOG_GAIN_DB = 250.0f;
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/***********************/
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/* High pass filtering */
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/***********************/
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/* Smoothing parameters for low end of pitch frequency range estimation */
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internal const float VARIABLE_HP_SMTH_COEF1 = 0.1f;
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internal const float VARIABLE_HP_SMTH_COEF2 = 0.015f;
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internal const float VARIABLE_HP_MAX_DELTA_FREQ = 0.4f;
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/* Min and max cut-off frequency values (-3 dB points) */
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internal const int VARIABLE_HP_MIN_CUTOFF_HZ = 60;
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internal const int VARIABLE_HP_MAX_CUTOFF_HZ = 100;
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/***********/
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/* Various */
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/***********/
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/* VAD threshold */
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internal const float SPEECH_ACTIVITY_DTX_THRES = 0.05f;
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/* Speech Activity LBRR enable threshold */
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internal const float LBRR_SPEECH_ACTIVITY_THRES = 0.3f;
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/*************************/
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/* Perceptual parameters */
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/*************************/
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/* reduction in coding SNR during low speech activity */
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internal const float BG_SNR_DECR_dB = 2.0f;
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/* factor for reducing quantization noise during voiced speech */
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internal const float HARM_SNR_INCR_dB = 2.0f;
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/* factor for reducing quantization noise for unvoiced sparse signals */
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internal const float SPARSE_SNR_INCR_dB = 2.0f;
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/* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
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internal const float SPARSENESS_THRESHOLD_QNT_OFFSET = 0.75f;
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/* warping control */
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internal const float WARPING_MULTIPLIER = 0.015f;
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/* fraction added to first autocorrelation value */
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internal const float SHAPE_WHITE_NOISE_FRACTION = 5e-5f;
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/* noise shaping filter chirp factor */
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internal const float BANDWIDTH_EXPANSION = 0.95f;
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/* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */
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internal const float LOW_RATE_BANDWIDTH_EXPANSION_DELTA = 0.01f;
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/* extra harmonic boosting (signal shaping) at low bitrates */
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internal const float LOW_RATE_HARMONIC_BOOST = 0.1f;
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/* extra harmonic boosting (signal shaping) for noisy input signals */
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internal const float LOW_INPUT_QUALITY_HARMONIC_BOOST = 0.1f;
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/* harmonic noise shaping */
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internal const float HARMONIC_SHAPING = 0.3f;
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/* extra harmonic noise shaping for high bitrates or noisy input */
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internal const float HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING = 0.2f;
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/* parameter for shaping noise towards higher frequencies */
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internal const float HP_NOISE_COEF = 0.25f;
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/* parameter for shaping noise even more towards higher frequencies during voiced speech */
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internal const float HARM_HP_NOISE_COEF = 0.35f;
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/* parameter for applying a high-pass tilt to the input signal */
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internal const float INPUT_TILT = 0.05f;
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/* parameter for extra high-pass tilt to the input signal at high rates */
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internal const float HIGH_RATE_INPUT_TILT = 0.1f;
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/* parameter for reducing noise at the very low frequencies */
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internal const float LOW_FREQ_SHAPING = 4.0f;
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/* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
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internal const float LOW_QUALITY_LOW_FREQ_SHAPING_DECR = 0.5f;
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/* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower . more smoothing) */
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internal const float SUBFR_SMTH_COEF = 0.4f;
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/* parameters defining the R/D tradeoff in the residual quantizer */
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internal const float LAMBDA_OFFSET = 1.2f;
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internal const float LAMBDA_SPEECH_ACT = -0.2f;
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internal const float LAMBDA_DELAYED_DECISIONS = -0.05f;
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internal const float LAMBDA_INPUT_QUALITY = -0.1f;
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internal const float LAMBDA_CODING_QUALITY = -0.2f;
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internal const float LAMBDA_QUANT_OFFSET = 0.8f;
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/* Compensation in bitrate calculations for 10 ms modes */
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internal const int REDUCE_BITRATE_10_MS_BPS = 2200;
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/* Maximum time before allowing a bandwidth transition */
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internal const int MAX_BANDWIDTH_SWITCH_DELAY_MS = 5000;
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}
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}
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