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annotate src/opus-1.3/silk/tuning_parameters.h @ 83:ae30d91d2ffe

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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents 7aeed7906520
children
rev   line source
Chris@69 1 /***********************************************************************
Chris@69 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69 3 Redistribution and use in source and binary forms, with or without
Chris@69 4 modification, are permitted provided that the following conditions
Chris@69 5 are met:
Chris@69 6 - Redistributions of source code must retain the above copyright notice,
Chris@69 7 this list of conditions and the following disclaimer.
Chris@69 8 - Redistributions in binary form must reproduce the above copyright
Chris@69 9 notice, this list of conditions and the following disclaimer in the
Chris@69 10 documentation and/or other materials provided with the distribution.
Chris@69 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69 12 names of specific contributors, may be used to endorse or promote
Chris@69 13 products derived from this software without specific prior written
Chris@69 14 permission.
Chris@69 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69 25 POSSIBILITY OF SUCH DAMAGE.
Chris@69 26 ***********************************************************************/
Chris@69 27
Chris@69 28 #ifndef SILK_TUNING_PARAMETERS_H
Chris@69 29 #define SILK_TUNING_PARAMETERS_H
Chris@69 30
Chris@69 31 #ifdef __cplusplus
Chris@69 32 extern "C"
Chris@69 33 {
Chris@69 34 #endif
Chris@69 35
Chris@69 36 /* Decay time for bitreservoir */
Chris@69 37 #define BITRESERVOIR_DECAY_TIME_MS 500
Chris@69 38
Chris@69 39 /*******************/
Chris@69 40 /* Pitch estimator */
Chris@69 41 /*******************/
Chris@69 42
Chris@69 43 /* Level of noise floor for whitening filter LPC analysis in pitch analysis */
Chris@69 44 #define FIND_PITCH_WHITE_NOISE_FRACTION 1e-3f
Chris@69 45
Chris@69 46 /* Bandwidth expansion for whitening filter in pitch analysis */
Chris@69 47 #define FIND_PITCH_BANDWIDTH_EXPANSION 0.99f
Chris@69 48
Chris@69 49 /*********************/
Chris@69 50 /* Linear prediction */
Chris@69 51 /*********************/
Chris@69 52
Chris@69 53 /* LPC analysis regularization */
Chris@69 54 #define FIND_LPC_COND_FAC 1e-5f
Chris@69 55
Chris@69 56 /* Max cumulative LTP gain */
Chris@69 57 #define MAX_SUM_LOG_GAIN_DB 250.0f
Chris@69 58
Chris@69 59 /* LTP analysis defines */
Chris@69 60 #define LTP_CORR_INV_MAX 0.03f
Chris@69 61
Chris@69 62 /***********************/
Chris@69 63 /* High pass filtering */
Chris@69 64 /***********************/
Chris@69 65
Chris@69 66 /* Smoothing parameters for low end of pitch frequency range estimation */
Chris@69 67 #define VARIABLE_HP_SMTH_COEF1 0.1f
Chris@69 68 #define VARIABLE_HP_SMTH_COEF2 0.015f
Chris@69 69 #define VARIABLE_HP_MAX_DELTA_FREQ 0.4f
Chris@69 70
Chris@69 71 /* Min and max cut-off frequency values (-3 dB points) */
Chris@69 72 #define VARIABLE_HP_MIN_CUTOFF_HZ 60
Chris@69 73 #define VARIABLE_HP_MAX_CUTOFF_HZ 100
Chris@69 74
Chris@69 75 /***********/
Chris@69 76 /* Various */
Chris@69 77 /***********/
Chris@69 78
Chris@69 79 /* VAD threshold */
Chris@69 80 #define SPEECH_ACTIVITY_DTX_THRES 0.05f
Chris@69 81
Chris@69 82 /* Speech Activity LBRR enable threshold */
Chris@69 83 #define LBRR_SPEECH_ACTIVITY_THRES 0.3f
Chris@69 84
Chris@69 85 /*************************/
Chris@69 86 /* Perceptual parameters */
Chris@69 87 /*************************/
Chris@69 88
Chris@69 89 /* reduction in coding SNR during low speech activity */
Chris@69 90 #define BG_SNR_DECR_dB 2.0f
Chris@69 91
Chris@69 92 /* factor for reducing quantization noise during voiced speech */
Chris@69 93 #define HARM_SNR_INCR_dB 2.0f
Chris@69 94
Chris@69 95 /* factor for reducing quantization noise for unvoiced sparse signals */
Chris@69 96 #define SPARSE_SNR_INCR_dB 2.0f
Chris@69 97
Chris@69 98 /* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
Chris@69 99 #define ENERGY_VARIATION_THRESHOLD_QNT_OFFSET 0.6f
Chris@69 100
Chris@69 101 /* warping control */
Chris@69 102 #define WARPING_MULTIPLIER 0.015f
Chris@69 103
Chris@69 104 /* fraction added to first autocorrelation value */
Chris@69 105 #define SHAPE_WHITE_NOISE_FRACTION 3e-5f
Chris@69 106
Chris@69 107 /* noise shaping filter chirp factor */
Chris@69 108 #define BANDWIDTH_EXPANSION 0.94f
Chris@69 109
Chris@69 110 /* harmonic noise shaping */
Chris@69 111 #define HARMONIC_SHAPING 0.3f
Chris@69 112
Chris@69 113 /* extra harmonic noise shaping for high bitrates or noisy input */
Chris@69 114 #define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING 0.2f
Chris@69 115
Chris@69 116 /* parameter for shaping noise towards higher frequencies */
Chris@69 117 #define HP_NOISE_COEF 0.25f
Chris@69 118
Chris@69 119 /* parameter for shaping noise even more towards higher frequencies during voiced speech */
Chris@69 120 #define HARM_HP_NOISE_COEF 0.35f
Chris@69 121
Chris@69 122 /* parameter for applying a high-pass tilt to the input signal */
Chris@69 123 #define INPUT_TILT 0.05f
Chris@69 124
Chris@69 125 /* parameter for extra high-pass tilt to the input signal at high rates */
Chris@69 126 #define HIGH_RATE_INPUT_TILT 0.1f
Chris@69 127
Chris@69 128 /* parameter for reducing noise at the very low frequencies */
Chris@69 129 #define LOW_FREQ_SHAPING 4.0f
Chris@69 130
Chris@69 131 /* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
Chris@69 132 #define LOW_QUALITY_LOW_FREQ_SHAPING_DECR 0.5f
Chris@69 133
Chris@69 134 /* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */
Chris@69 135 #define SUBFR_SMTH_COEF 0.4f
Chris@69 136
Chris@69 137 /* parameters defining the R/D tradeoff in the residual quantizer */
Chris@69 138 #define LAMBDA_OFFSET 1.2f
Chris@69 139 #define LAMBDA_SPEECH_ACT -0.2f
Chris@69 140 #define LAMBDA_DELAYED_DECISIONS -0.05f
Chris@69 141 #define LAMBDA_INPUT_QUALITY -0.1f
Chris@69 142 #define LAMBDA_CODING_QUALITY -0.2f
Chris@69 143 #define LAMBDA_QUANT_OFFSET 0.8f
Chris@69 144
Chris@69 145 /* Compensation in bitrate calculations for 10 ms modes */
Chris@69 146 #define REDUCE_BITRATE_10_MS_BPS 2200
Chris@69 147
Chris@69 148 /* Maximum time before allowing a bandwidth transition */
Chris@69 149 #define MAX_BANDWIDTH_SWITCH_DELAY_MS 5000
Chris@69 150
Chris@69 151 #ifdef __cplusplus
Chris@69 152 }
Chris@69 153 #endif
Chris@69 154
Chris@69 155 #endif /* SILK_TUNING_PARAMETERS_H */