pandemonium_engine/thirdparty/opus/silk/tuning_parameters.h

#ifndef SILK_TUNING_PARAMETERS_H
#define SILK_TUNING_PARAMETERS_H
/***********************************************************************
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are met:
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names of specific contributors, may be used to endorse or promote
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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***********************************************************************/




#ifdef __cplusplus
extern "C"
{
#endif

/* Decay time for bitreservoir */
#define BITRESERVOIR_DECAY_TIME_MS                      500

/*******************/
/* Pitch estimator */
/*******************/

/* Level of noise floor for whitening filter LPC analysis in pitch analysis */
#define FIND_PITCH_WHITE_NOISE_FRACTION                 1e-3f

/* Bandwidth expansion for whitening filter in pitch analysis */
#define FIND_PITCH_BANDWIDTH_EXPANSION                  0.99f

/*********************/
/* Linear prediction */
/*********************/

/* LPC analysis regularization */
#define FIND_LPC_COND_FAC                               1e-5f

/* LTP analysis defines */
#define FIND_LTP_COND_FAC                               1e-5f
#define LTP_DAMPING                                     0.05f
#define LTP_SMOOTHING                                   0.1f

/* LTP quantization settings */
#define MU_LTP_QUANT_NB                                 0.03f
#define MU_LTP_QUANT_MB                                 0.025f
#define MU_LTP_QUANT_WB                                 0.02f

/* Max cumulative LTP gain */
#define MAX_SUM_LOG_GAIN_DB                             250.0f

/***********************/
/* High pass filtering */
/***********************/

/* Smoothing parameters for low end of pitch frequency range estimation */
#define VARIABLE_HP_SMTH_COEF1                          0.1f
#define VARIABLE_HP_SMTH_COEF2                          0.015f
#define VARIABLE_HP_MAX_DELTA_FREQ                      0.4f

/* Min and max cut-off frequency values (-3 dB points) */
#define VARIABLE_HP_MIN_CUTOFF_HZ                       60
#define VARIABLE_HP_MAX_CUTOFF_HZ                       100

/***********/
/* Various */
/***********/

/* VAD threshold */
#define SPEECH_ACTIVITY_DTX_THRES                       0.05f

/* Speech Activity LBRR enable threshold */
#define LBRR_SPEECH_ACTIVITY_THRES                      0.3f

/*************************/
/* Perceptual parameters */
/*************************/

/* reduction in coding SNR during low speech activity */
#define BG_SNR_DECR_dB                                  2.0f

/* factor for reducing quantization noise during voiced speech */
#define HARM_SNR_INCR_dB                                2.0f

/* factor for reducing quantization noise for unvoiced sparse signals */
#define SPARSE_SNR_INCR_dB                              2.0f

/* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
#define SPARSENESS_THRESHOLD_QNT_OFFSET                 0.75f

/* warping control */
#define WARPING_MULTIPLIER                              0.015f

/* fraction added to first autocorrelation value */
#define SHAPE_WHITE_NOISE_FRACTION                      5e-5f

/* noise shaping filter chirp factor */
#define BANDWIDTH_EXPANSION                             0.95f

/* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */
#define LOW_RATE_BANDWIDTH_EXPANSION_DELTA              0.01f

/* extra harmonic boosting (signal shaping) at low bitrates */
#define LOW_RATE_HARMONIC_BOOST                         0.1f

/* extra harmonic boosting (signal shaping) for noisy input signals */
#define LOW_INPUT_QUALITY_HARMONIC_BOOST                0.1f

/* harmonic noise shaping */
#define HARMONIC_SHAPING                                0.3f

/* extra harmonic noise shaping for high bitrates or noisy input */
#define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING       0.2f

/* parameter for shaping noise towards higher frequencies */
#define HP_NOISE_COEF                                   0.25f

/* parameter for shaping noise even more towards higher frequencies during voiced speech */
#define HARM_HP_NOISE_COEF                              0.35f

/* parameter for applying a high-pass tilt to the input signal */
#define INPUT_TILT                                      0.05f

/* parameter for extra high-pass tilt to the input signal at high rates */
#define HIGH_RATE_INPUT_TILT                            0.1f

/* parameter for reducing noise at the very low frequencies */
#define LOW_FREQ_SHAPING                                4.0f

/* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
#define LOW_QUALITY_LOW_FREQ_SHAPING_DECR               0.5f

/* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */
#define SUBFR_SMTH_COEF                                 0.4f

/* parameters defining the R/D tradeoff in the residual quantizer */
#define LAMBDA_OFFSET                                   1.2f
#define LAMBDA_SPEECH_ACT                               -0.2f
#define LAMBDA_DELAYED_DECISIONS                        -0.05f
#define LAMBDA_INPUT_QUALITY                            -0.1f
#define LAMBDA_CODING_QUALITY                           -0.2f
#define LAMBDA_QUANT_OFFSET                             0.8f

/* Compensation in bitrate calculations for 10 ms modes */
#define REDUCE_BITRATE_10_MS_BPS                        2200

/* Maximum time before allowing a bandwidth transition */
#define MAX_BANDWIDTH_SWITCH_DELAY_MS                   5000

#ifdef __cplusplus
}
#endif

#endif /* SILK_TUNING_PARAMETERS_H */