1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/tuning_parameters.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,171 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifndef SILK_TUNING_PARAMETERS_H
1.32 +#define SILK_TUNING_PARAMETERS_H
1.33 +
1.34 +#ifdef __cplusplus
1.35 +extern "C"
1.36 +{
1.37 +#endif
1.38 +
1.39 +/* Decay time for bitreservoir */
1.40 +#define BITRESERVOIR_DECAY_TIME_MS 500
1.41 +
1.42 +/*******************/
1.43 +/* Pitch estimator */
1.44 +/*******************/
1.45 +
1.46 +/* Level of noise floor for whitening filter LPC analysis in pitch analysis */
1.47 +#define FIND_PITCH_WHITE_NOISE_FRACTION 1e-3f
1.48 +
1.49 +/* Bandwidth expansion for whitening filter in pitch analysis */
1.50 +#define FIND_PITCH_BANDWIDTH_EXPANSION 0.99f
1.51 +
1.52 +/*********************/
1.53 +/* Linear prediction */
1.54 +/*********************/
1.55 +
1.56 +/* LPC analysis regularization */
1.57 +#define FIND_LPC_COND_FAC 1e-5f
1.58 +
1.59 +/* LTP analysis defines */
1.60 +#define FIND_LTP_COND_FAC 1e-5f
1.61 +#define LTP_DAMPING 0.05f
1.62 +#define LTP_SMOOTHING 0.1f
1.63 +
1.64 +/* LTP quantization settings */
1.65 +#define MU_LTP_QUANT_NB 0.03f
1.66 +#define MU_LTP_QUANT_MB 0.025f
1.67 +#define MU_LTP_QUANT_WB 0.02f
1.68 +
1.69 +/* Max cumulative LTP gain */
1.70 +#define MAX_SUM_LOG_GAIN_DB 250.0f
1.71 +
1.72 +/***********************/
1.73 +/* High pass filtering */
1.74 +/***********************/
1.75 +
1.76 +/* Smoothing parameters for low end of pitch frequency range estimation */
1.77 +#define VARIABLE_HP_SMTH_COEF1 0.1f
1.78 +#define VARIABLE_HP_SMTH_COEF2 0.015f
1.79 +#define VARIABLE_HP_MAX_DELTA_FREQ 0.4f
1.80 +
1.81 +/* Min and max cut-off frequency values (-3 dB points) */
1.82 +#define VARIABLE_HP_MIN_CUTOFF_HZ 60
1.83 +#define VARIABLE_HP_MAX_CUTOFF_HZ 100
1.84 +
1.85 +/***********/
1.86 +/* Various */
1.87 +/***********/
1.88 +
1.89 +/* VAD threshold */
1.90 +#define SPEECH_ACTIVITY_DTX_THRES 0.05f
1.91 +
1.92 +/* Speech Activity LBRR enable threshold */
1.93 +#define LBRR_SPEECH_ACTIVITY_THRES 0.3f
1.94 +
1.95 +/*************************/
1.96 +/* Perceptual parameters */
1.97 +/*************************/
1.98 +
1.99 +/* reduction in coding SNR during low speech activity */
1.100 +#define BG_SNR_DECR_dB 2.0f
1.101 +
1.102 +/* factor for reducing quantization noise during voiced speech */
1.103 +#define HARM_SNR_INCR_dB 2.0f
1.104 +
1.105 +/* factor for reducing quantization noise for unvoiced sparse signals */
1.106 +#define SPARSE_SNR_INCR_dB 2.0f
1.107 +
1.108 +/* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
1.109 +#define SPARSENESS_THRESHOLD_QNT_OFFSET 0.75f
1.110 +
1.111 +/* warping control */
1.112 +#define WARPING_MULTIPLIER 0.015f
1.113 +
1.114 +/* fraction added to first autocorrelation value */
1.115 +#define SHAPE_WHITE_NOISE_FRACTION 5e-5f
1.116 +
1.117 +/* noise shaping filter chirp factor */
1.118 +#define BANDWIDTH_EXPANSION 0.95f
1.119 +
1.120 +/* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */
1.121 +#define LOW_RATE_BANDWIDTH_EXPANSION_DELTA 0.01f
1.122 +
1.123 +/* extra harmonic boosting (signal shaping) at low bitrates */
1.124 +#define LOW_RATE_HARMONIC_BOOST 0.1f
1.125 +
1.126 +/* extra harmonic boosting (signal shaping) for noisy input signals */
1.127 +#define LOW_INPUT_QUALITY_HARMONIC_BOOST 0.1f
1.128 +
1.129 +/* harmonic noise shaping */
1.130 +#define HARMONIC_SHAPING 0.3f
1.131 +
1.132 +/* extra harmonic noise shaping for high bitrates or noisy input */
1.133 +#define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING 0.2f
1.134 +
1.135 +/* parameter for shaping noise towards higher frequencies */
1.136 +#define HP_NOISE_COEF 0.25f
1.137 +
1.138 +/* parameter for shaping noise even more towards higher frequencies during voiced speech */
1.139 +#define HARM_HP_NOISE_COEF 0.35f
1.140 +
1.141 +/* parameter for applying a high-pass tilt to the input signal */
1.142 +#define INPUT_TILT 0.05f
1.143 +
1.144 +/* parameter for extra high-pass tilt to the input signal at high rates */
1.145 +#define HIGH_RATE_INPUT_TILT 0.1f
1.146 +
1.147 +/* parameter for reducing noise at the very low frequencies */
1.148 +#define LOW_FREQ_SHAPING 4.0f
1.149 +
1.150 +/* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
1.151 +#define LOW_QUALITY_LOW_FREQ_SHAPING_DECR 0.5f
1.152 +
1.153 +/* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */
1.154 +#define SUBFR_SMTH_COEF 0.4f
1.155 +
1.156 +/* parameters defining the R/D tradeoff in the residual quantizer */
1.157 +#define LAMBDA_OFFSET 1.2f
1.158 +#define LAMBDA_SPEECH_ACT -0.2f
1.159 +#define LAMBDA_DELAYED_DECISIONS -0.05f
1.160 +#define LAMBDA_INPUT_QUALITY -0.1f
1.161 +#define LAMBDA_CODING_QUALITY -0.2f
1.162 +#define LAMBDA_QUANT_OFFSET 0.8f
1.163 +
1.164 +/* Compensation in bitrate calculations for 10 ms modes */
1.165 +#define REDUCE_BITRATE_10_MS_BPS 2200
1.166 +
1.167 +/* Maximum time before allowing a bandwidth transition */
1.168 +#define MAX_BANDWIDTH_SWITCH_DELAY_MS 5000
1.169 +
1.170 +#ifdef __cplusplus
1.171 +}
1.172 +#endif
1.173 +
1.174 +#endif /* SILK_TUNING_PARAMETERS_H */
