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comparison: media/libopus/silk/tuning_parameters.h
media/libopus/silk/tuning_parameters.h
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| 1 /*********************************************************************** | |
| 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 - Redistributions of source code must retain the above copyright notice, | |
| 7 this list of conditions and the following disclaimer. | |
| 8 - Redistributions in binary form must reproduce the above copyright | |
| 9 notice, this list of conditions and the following disclaimer in the | |
| 10 documentation and/or other materials provided with the distribution. | |
| 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | |
| 12 names of specific contributors, may be used to endorse or promote | |
| 13 products derived from this software without specific prior written | |
| 14 permission. | |
| 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 POSSIBILITY OF SUCH DAMAGE. | |
| 26 ***********************************************************************/ | |
| 27 | |
| 28 #ifndef SILK_TUNING_PARAMETERS_H | |
| 29 #define SILK_TUNING_PARAMETERS_H | |
| 30 | |
| 31 #ifdef __cplusplus | |
| 32 extern "C" | |
| 33 { | |
| 34 #endif | |
| 35 | |
| 36 /* Decay time for bitreservoir */ | |
| 37 #define BITRESERVOIR_DECAY_TIME_MS 500 | |
| 38 | |
| 39 /*******************/ | |
| 40 /* Pitch estimator */ | |
| 41 /*******************/ | |
| 42 | |
| 43 /* Level of noise floor for whitening filter LPC analysis in pitch analysis */ | |
| 44 #define FIND_PITCH_WHITE_NOISE_FRACTION 1e-3f | |
| 45 | |
| 46 /* Bandwidth expansion for whitening filter in pitch analysis */ | |
| 47 #define FIND_PITCH_BANDWIDTH_EXPANSION 0.99f | |
| 48 | |
| 49 /*********************/ | |
| 50 /* Linear prediction */ | |
| 51 /*********************/ | |
| 52 | |
| 53 /* LPC analysis regularization */ | |
| 54 #define FIND_LPC_COND_FAC 1e-5f | |
| 55 | |
| 56 /* LTP analysis defines */ | |
| 57 #define FIND_LTP_COND_FAC 1e-5f | |
| 58 #define LTP_DAMPING 0.05f | |
| 59 #define LTP_SMOOTHING 0.1f | |
| 60 | |
| 61 /* LTP quantization settings */ | |
| 62 #define MU_LTP_QUANT_NB 0.03f | |
| 63 #define MU_LTP_QUANT_MB 0.025f | |
| 64 #define MU_LTP_QUANT_WB 0.02f | |
| 65 | |
| 66 /* Max cumulative LTP gain */ | |
| 67 #define MAX_SUM_LOG_GAIN_DB 250.0f | |
| 68 | |
| 69 /***********************/ | |
| 70 /* High pass filtering */ | |
| 71 /***********************/ | |
| 72 | |
| 73 /* Smoothing parameters for low end of pitch frequency range estimation */ | |
| 74 #define VARIABLE_HP_SMTH_COEF1 0.1f | |
| 75 #define VARIABLE_HP_SMTH_COEF2 0.015f | |
| 76 #define VARIABLE_HP_MAX_DELTA_FREQ 0.4f | |
| 77 | |
| 78 /* Min and max cut-off frequency values (-3 dB points) */ | |
| 79 #define VARIABLE_HP_MIN_CUTOFF_HZ 60 | |
| 80 #define VARIABLE_HP_MAX_CUTOFF_HZ 100 | |
| 81 | |
| 82 /***********/ | |
| 83 /* Various */ | |
| 84 /***********/ | |
| 85 | |
| 86 /* VAD threshold */ | |
| 87 #define SPEECH_ACTIVITY_DTX_THRES 0.05f | |
| 88 | |
| 89 /* Speech Activity LBRR enable threshold */ | |
| 90 #define LBRR_SPEECH_ACTIVITY_THRES 0.3f | |
| 91 | |
| 92 /*************************/ | |
| 93 /* Perceptual parameters */ | |
| 94 /*************************/ | |
| 95 | |
| 96 /* reduction in coding SNR during low speech activity */ | |
| 97 #define BG_SNR_DECR_dB 2.0f | |
| 98 | |
| 99 /* factor for reducing quantization noise during voiced speech */ | |
| 100 #define HARM_SNR_INCR_dB 2.0f | |
| 101 | |
| 102 /* factor for reducing quantization noise for unvoiced sparse signals */ | |
| 103 #define SPARSE_SNR_INCR_dB 2.0f | |
| 104 | |
| 105 /* threshold for sparseness measure above which to use lower quantization offset during unvoiced */ | |
| 106 #define SPARSENESS_THRESHOLD_QNT_OFFSET 0.75f | |
| 107 | |
| 108 /* warping control */ | |
| 109 #define WARPING_MULTIPLIER 0.015f | |
| 110 | |
| 111 /* fraction added to first autocorrelation value */ | |
| 112 #define SHAPE_WHITE_NOISE_FRACTION 5e-5f | |
| 113 | |
| 114 /* noise shaping filter chirp factor */ | |
| 115 #define BANDWIDTH_EXPANSION 0.95f | |
| 116 | |
| 117 /* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */ | |
| 118 #define LOW_RATE_BANDWIDTH_EXPANSION_DELTA 0.01f | |
| 119 | |
| 120 /* extra harmonic boosting (signal shaping) at low bitrates */ | |
| 121 #define LOW_RATE_HARMONIC_BOOST 0.1f | |
| 122 | |
| 123 /* extra harmonic boosting (signal shaping) for noisy input signals */ | |
| 124 #define LOW_INPUT_QUALITY_HARMONIC_BOOST 0.1f | |
| 125 | |
| 126 /* harmonic noise shaping */ | |
| 127 #define HARMONIC_SHAPING 0.3f | |
| 128 | |
| 129 /* extra harmonic noise shaping for high bitrates or noisy input */ | |
| 130 #define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING 0.2f | |
| 131 | |
| 132 /* parameter for shaping noise towards higher frequencies */ | |
| 133 #define HP_NOISE_COEF 0.25f | |
| 134 | |
| 135 /* parameter for shaping noise even more towards higher frequencies during voiced speech */ | |
| 136 #define HARM_HP_NOISE_COEF 0.35f | |
| 137 | |
| 138 /* parameter for applying a high-pass tilt to the input signal */ | |
| 139 #define INPUT_TILT 0.05f | |
| 140 | |
| 141 /* parameter for extra high-pass tilt to the input signal at high rates */ | |
| 142 #define HIGH_RATE_INPUT_TILT 0.1f | |
| 143 | |
| 144 /* parameter for reducing noise at the very low frequencies */ | |
| 145 #define LOW_FREQ_SHAPING 4.0f | |
| 146 | |
| 147 /* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */ | |
| 148 #define LOW_QUALITY_LOW_FREQ_SHAPING_DECR 0.5f | |
| 149 | |
| 150 /* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */ | |
| 151 #define SUBFR_SMTH_COEF 0.4f | |
| 152 | |
| 153 /* parameters defining the R/D tradeoff in the residual quantizer */ | |
| 154 #define LAMBDA_OFFSET 1.2f | |
| 155 #define LAMBDA_SPEECH_ACT -0.2f | |
| 156 #define LAMBDA_DELAYED_DECISIONS -0.05f | |
| 157 #define LAMBDA_INPUT_QUALITY -0.1f | |
| 158 #define LAMBDA_CODING_QUALITY -0.2f | |
| 159 #define LAMBDA_QUANT_OFFSET 0.8f | |
| 160 | |
| 161 /* Compensation in bitrate calculations for 10 ms modes */ | |
| 162 #define REDUCE_BITRATE_10_MS_BPS 2200 | |
| 163 | |
| 164 /* Maximum time before allowing a bandwidth transition */ | |
| 165 #define MAX_BANDWIDTH_SWITCH_DELAY_MS 5000 | |
| 166 | |
| 167 #ifdef __cplusplus | |
| 168 } | |
| 169 #endif | |
| 170 | |
| 171 #endif /* SILK_TUNING_PARAMETERS_H */ |
