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_DEFINE_H 29 #define SILK_DEFINE_H 30 31 #include "errors.h" 32 #include "typedef.h" 33 34 #ifdef __cplusplus 35 extern "C" 36 { 37 #endif 38 39 /* Max number of encoder channels (1/2) */ 40 #define ENCODER_NUM_CHANNELS 2 41 /* Number of decoder channels (1/2) */ 42 #define DECODER_NUM_CHANNELS 2 43 44 #define MAX_FRAMES_PER_PACKET 3 45 46 /* Limits on bitrate */ 47 #define MIN_TARGET_RATE_BPS 5000 48 #define MAX_TARGET_RATE_BPS 80000 49 50 /* LBRR thresholds */ 51 #define LBRR_NB_MIN_RATE_BPS 12000 52 #define LBRR_MB_MIN_RATE_BPS 14000 53 #define LBRR_WB_MIN_RATE_BPS 16000 54 55 /* DTX settings */ 56 #define NB_SPEECH_FRAMES_BEFORE_DTX 10 /* eq 200 ms */ 57 #define MAX_CONSECUTIVE_DTX 20 /* eq 400 ms */ 58 #define DTX_ACTIVITY_THRESHOLD 0.1f 59 60 /* VAD decision */ 61 #define VAD_NO_DECISION -1 62 #define VAD_NO_ACTIVITY 0 63 #define VAD_ACTIVITY 1 64 65 /* Maximum sampling frequency */ 66 #define MAX_FS_KHZ 16 67 #define MAX_API_FS_KHZ 48 68 69 /* Signal types */ 70 #define TYPE_NO_VOICE_ACTIVITY 0 71 #define TYPE_UNVOICED 1 72 #define TYPE_VOICED 2 73 74 /* Conditional coding types */ 75 #define CODE_INDEPENDENTLY 0 76 #define CODE_INDEPENDENTLY_NO_LTP_SCALING 1 77 #define CODE_CONDITIONALLY 2 78 79 /* Settings for stereo processing */ 80 #define STEREO_QUANT_TAB_SIZE 16 81 #define STEREO_QUANT_SUB_STEPS 5 82 #define STEREO_INTERP_LEN_MS 8 /* must be even */ 83 #define STEREO_RATIO_SMOOTH_COEF 0.01 /* smoothing coef for signal norms and stereo width */ 84 85 /* Range of pitch lag estimates */ 86 #define PITCH_EST_MIN_LAG_MS 2 /* 2 ms -> 500 Hz */ 87 #define PITCH_EST_MAX_LAG_MS 18 /* 18 ms -> 56 Hz */ 88 89 /* Maximum number of subframes */ 90 #define MAX_NB_SUBFR 4 91 92 /* Number of samples per frame */ 93 #define LTP_MEM_LENGTH_MS 20 94 #define SUB_FRAME_LENGTH_MS 5 95 #define MAX_SUB_FRAME_LENGTH ( SUB_FRAME_LENGTH_MS * MAX_FS_KHZ ) 96 #define MAX_FRAME_LENGTH_MS ( SUB_FRAME_LENGTH_MS * MAX_NB_SUBFR ) 97 #define MAX_FRAME_LENGTH ( MAX_FRAME_LENGTH_MS * MAX_FS_KHZ ) 98 99 /* Milliseconds of lookahead for pitch analysis */ 100 #define LA_PITCH_MS 2 101 #define LA_PITCH_MAX ( LA_PITCH_MS * MAX_FS_KHZ ) 102 103 /* Order of LPC used in find pitch */ 104 #define MAX_FIND_PITCH_LPC_ORDER 16 105 106 /* Length of LPC window used in find pitch */ 107 #define FIND_PITCH_LPC_WIN_MS ( 20 + (LA_PITCH_MS << 1) ) 108 #define FIND_PITCH_LPC_WIN_MS_2_SF ( 10 + (LA_PITCH_MS << 1) ) 109 #define FIND_PITCH_LPC_WIN_MAX ( FIND_PITCH_LPC_WIN_MS * MAX_FS_KHZ ) 110 111 /* Milliseconds of lookahead for noise shape analysis */ 112 #define LA_SHAPE_MS 5 113 #define LA_SHAPE_MAX ( LA_SHAPE_MS * MAX_FS_KHZ ) 114 115 /* Maximum length of LPC window used in noise shape analysis */ 116 #define SHAPE_LPC_WIN_MAX ( 15 * MAX_FS_KHZ ) 117 118 /* dB level of lowest gain quantization level */ 119 #define MIN_QGAIN_DB 2 120 /* dB level of highest gain quantization level */ 121 #define MAX_QGAIN_DB 88 122 /* Number of gain quantization levels */ 123 #define N_LEVELS_QGAIN 64 124 /* Max increase in gain quantization index */ 125 #define MAX_DELTA_GAIN_QUANT 36 126 /* Max decrease in gain quantization index */ 127 #define MIN_DELTA_GAIN_QUANT -4 128 129 /* Quantization offsets (multiples of 4) */ 130 #define OFFSET_VL_Q10 32 131 #define OFFSET_VH_Q10 100 132 #define OFFSET_UVL_Q10 100 133 #define OFFSET_UVH_Q10 240 134 135 #define QUANT_LEVEL_ADJUST_Q10 80 136 137 /* Maximum numbers of iterations used to stabilize an LPC vector */ 138 #define MAX_LPC_STABILIZE_ITERATIONS 16 139 #define MAX_PREDICTION_POWER_GAIN 1e4f 140 #define MAX_PREDICTION_POWER_GAIN_AFTER_RESET 1e2f 141 142 #define MAX_LPC_ORDER 16 143 #define MIN_LPC_ORDER 10 144 145 /* Find Pred Coef defines */ 146 #define LTP_ORDER 5 147 148 /* LTP quantization settings */ 149 #define NB_LTP_CBKS 3 150 151 /* Flag to use harmonic noise shaping */ 152 #define USE_HARM_SHAPING 1 153 154 /* Max LPC order of noise shaping filters */ 155 #define MAX_SHAPE_LPC_ORDER 24 156 157 #define HARM_SHAPE_FIR_TAPS 3 158 159 /* Maximum number of delayed decision states */ 160 #define MAX_DEL_DEC_STATES 4 161 162 #define LTP_BUF_LENGTH 512 163 #define LTP_MASK ( LTP_BUF_LENGTH - 1 ) 164 165 #define DECISION_DELAY 40 166 167 /* Number of subframes for excitation entropy coding */ 168 #define SHELL_CODEC_FRAME_LENGTH 16 169 #define LOG2_SHELL_CODEC_FRAME_LENGTH 4 170 #define MAX_NB_SHELL_BLOCKS ( MAX_FRAME_LENGTH / SHELL_CODEC_FRAME_LENGTH ) 171 172 /* Number of rate levels, for entropy coding of excitation */ 173 #define N_RATE_LEVELS 10 174 175 /* Maximum sum of pulses per shell coding frame */ 176 #define SILK_MAX_PULSES 16 177 178 #define MAX_MATRIX_SIZE MAX_LPC_ORDER /* Max of LPC Order and LTP order */ 179 180 # define NSQ_LPC_BUF_LENGTH MAX_LPC_ORDER 181 182 /***************************/ 183 /* Voice activity detector */ 184 /***************************/ 185 #define VAD_N_BANDS 4 186 187 #define VAD_INTERNAL_SUBFRAMES_LOG2 2 188 #define VAD_INTERNAL_SUBFRAMES ( 1 << VAD_INTERNAL_SUBFRAMES_LOG2 ) 189 190 #define VAD_NOISE_LEVEL_SMOOTH_COEF_Q16 1024 /* Must be < 4096 */ 191 #define VAD_NOISE_LEVELS_BIAS 50 192 193 /* Sigmoid settings */ 194 #define VAD_NEGATIVE_OFFSET_Q5 128 /* sigmoid is 0 at -128 */ 195 #define VAD_SNR_FACTOR_Q16 45000 196 197 /* smoothing for SNR measurement */ 198 #define VAD_SNR_SMOOTH_COEF_Q18 4096 199 200 /* Size of the piecewise linear cosine approximation table for the LSFs */ 201 #define LSF_COS_TAB_SZ_FIX 128 202 203 /******************/ 204 /* NLSF quantizer */ 205 /******************/ 206 #define NLSF_W_Q 2 207 #define NLSF_VQ_MAX_VECTORS 32 208 #define NLSF_QUANT_MAX_AMPLITUDE 4 209 #define NLSF_QUANT_MAX_AMPLITUDE_EXT 10 210 #define NLSF_QUANT_LEVEL_ADJ 0.1 211 #define NLSF_QUANT_DEL_DEC_STATES_LOG2 2 212 #define NLSF_QUANT_DEL_DEC_STATES ( 1 << NLSF_QUANT_DEL_DEC_STATES_LOG2 ) 213 214 /* Transition filtering for mode switching */ 215 #define TRANSITION_TIME_MS 5120 /* 5120 = 64 * FRAME_LENGTH_MS * ( TRANSITION_INT_NUM - 1 ) = 64*(20*4)*/ 216 #define TRANSITION_NB 3 /* Hardcoded in tables */ 217 #define TRANSITION_NA 2 /* Hardcoded in tables */ 218 #define TRANSITION_INT_NUM 5 /* Hardcoded in tables */ 219 #define TRANSITION_FRAMES ( TRANSITION_TIME_MS / MAX_FRAME_LENGTH_MS ) 220 #define TRANSITION_INT_STEPS ( TRANSITION_FRAMES / ( TRANSITION_INT_NUM - 1 ) ) 221 222 /* BWE factors to apply after packet loss */ 223 #define BWE_AFTER_LOSS_Q16 63570 224 225 /* Defines for CN generation */ 226 #define CNG_BUF_MASK_MAX 255 /* 2^floor(log2(MAX_FRAME_LENGTH))-1 */ 227 #define CNG_GAIN_SMTH_Q16 4634 /* 0.25^(1/4) */ 228 #define CNG_NLSF_SMTH_Q16 16348 /* 0.25 */ 229 230 #ifdef __cplusplus 231 } 232 #endif 233 234 #endif 235