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_SIGPROC_FLP_H 29 #define SILK_SIGPROC_FLP_H 30 31 #include "SigProc_FIX.h" 32 #include "float_cast.h" 33 #include <math.h> 34 35 #ifdef __cplusplus 36 extern "C" 37 { 38 #endif 39 40 /********************************************************************/ 41 /* SIGNAL PROCESSING FUNCTIONS */ 42 /********************************************************************/ 43 44 /* Chirp (bw expand) LP AR filter */ 45 void silk_bwexpander_FLP( 46 silk_float *ar, /* I/O AR filter to be expanded (without leading 1) */ 47 const opus_int d, /* I length of ar */ 48 const silk_float chirp /* I chirp factor (typically in range (0..1) ) */ 49 ); 50 51 /* compute inverse of LPC prediction gain, and */ 52 /* test if LPC coefficients are stable (all poles within unit circle) */ 53 /* this code is based on silk_FLP_a2k() */ 54 silk_float silk_LPC_inverse_pred_gain_FLP( /* O return inverse prediction gain, energy domain */ 55 const silk_float *A, /* I prediction coefficients [order] */ 56 opus_int32 order /* I prediction order */ 57 ); 58 59 silk_float silk_schur_FLP( /* O returns residual energy */ 60 silk_float refl_coef[], /* O reflection coefficients (length order) */ 61 const silk_float auto_corr[], /* I autocorrelation sequence (length order+1) */ 62 opus_int order /* I order */ 63 ); 64 65 void silk_k2a_FLP( 66 silk_float *A, /* O prediction coefficients [order] */ 67 const silk_float *rc, /* I reflection coefficients [order] */ 68 opus_int32 order /* I prediction order */ 69 ); 70 71 /* Solve the normal equations using the Levinson-Durbin recursion */ 72 silk_float silk_levinsondurbin_FLP( /* O prediction error energy */ 73 silk_float A[], /* O prediction coefficients [order] */ 74 const silk_float corr[], /* I input auto-correlations [order + 1] */ 75 const opus_int order /* I prediction order */ 76 ); 77 78 /* compute autocorrelation */ 79 void silk_autocorrelation_FLP( 80 silk_float *results, /* O result (length correlationCount) */ 81 const silk_float *inputData, /* I input data to correlate */ 82 opus_int inputDataSize, /* I length of input */ 83 opus_int correlationCount /* I number of correlation taps to compute */ 84 ); 85 86 opus_int silk_pitch_analysis_core_FLP( /* O Voicing estimate: 0 voiced, 1 unvoiced */ 87 const silk_float *frame, /* I Signal of length PE_FRAME_LENGTH_MS*Fs_kHz */ 88 opus_int *pitch_out, /* O Pitch lag values [nb_subfr] */ 89 opus_int16 *lagIndex, /* O Lag Index */ 90 opus_int8 *contourIndex, /* O Pitch contour Index */ 91 silk_float *LTPCorr, /* I/O Normalized correlation; input: value from previous frame */ 92 opus_int prevLag, /* I Last lag of previous frame; set to zero is unvoiced */ 93 const silk_float search_thres1, /* I First stage threshold for lag candidates 0 - 1 */ 94 const silk_float search_thres2, /* I Final threshold for lag candidates 0 - 1 */ 95 const opus_int Fs_kHz, /* I sample frequency (kHz) */ 96 const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */ 97 const opus_int nb_subfr /* I Number of 5 ms subframes */ 98 ); 99 100 void silk_insertion_sort_decreasing_FLP( 101 silk_float *a, /* I/O Unsorted / Sorted vector */ 102 opus_int *idx, /* O Index vector for the sorted elements */ 103 const opus_int L, /* I Vector length */ 104 const opus_int K /* I Number of correctly sorted positions */ 105 ); 106 107 /* Compute reflection coefficients from input signal */ 108 silk_float silk_burg_modified_FLP( /* O returns residual energy */ 109 silk_float A[], /* O prediction coefficients (length order) */ 110 const silk_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */ 111 const silk_float minInvGain, /* I minimum inverse prediction gain */ 112 const opus_int subfr_length, /* I input signal subframe length (incl. D preceding samples) */ 113 const opus_int nb_subfr, /* I number of subframes stacked in x */ 114 const opus_int D /* I order */ 115 ); 116 117 /* multiply a vector by a constant */ 118 void silk_scale_vector_FLP( 119 silk_float *data1, 120 silk_float gain, 121 opus_int dataSize 122 ); 123 124 /* copy and multiply a vector by a constant */ 125 void silk_scale_copy_vector_FLP( 126 silk_float *data_out, 127 const silk_float *data_in, 128 silk_float gain, 129 opus_int dataSize 130 ); 131 132 /* inner product of two silk_float arrays, with result as double */ 133 double silk_inner_product_FLP( 134 const silk_float *data1, 135 const silk_float *data2, 136 opus_int dataSize 137 ); 138 139 /* sum of squares of a silk_float array, with result as double */ 140 double silk_energy_FLP( 141 const silk_float *data, 142 opus_int dataSize 143 ); 144 145 /********************************************************************/ 146 /* MACROS */ 147 /********************************************************************/ 148 149 #define PI (3.1415926536f) 150 151 #define silk_min_float( a, b ) (((a) < (b)) ? (a) : (b)) 152 #define silk_max_float( a, b ) (((a) > (b)) ? (a) : (b)) 153 #define silk_abs_float( a ) ((silk_float)fabs(a)) 154 155 /* sigmoid function */ 156 static inline silk_float silk_sigmoid( silk_float x ) 157 { 158 return (silk_float)(1.0 / (1.0 + exp(-x))); 159 } 160 161 /* floating-point to integer conversion (rounding) */ 162 static inline opus_int32 silk_float2int( silk_float x ) 163 { 164 return (opus_int32)float2int( x ); 165 } 166 167 /* floating-point to integer conversion (rounding) */ 168 static inline void silk_float2short_array( 169 opus_int16 *out, 170 const silk_float *in, 171 opus_int32 length 172 ) 173 { 174 opus_int32 k; 175 for( k = length - 1; k >= 0; k-- ) { 176 out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) ); 177 } 178 } 179 180 /* integer to floating-point conversion */ 181 static inline void silk_short2float_array( 182 silk_float *out, 183 const opus_int16 *in, 184 opus_int32 length 185 ) 186 { 187 opus_int32 k; 188 for( k = length - 1; k >= 0; k-- ) { 189 out[k] = (silk_float)in[k]; 190 } 191 } 192 193 /* using log2() helps the fixed-point conversion */ 194 static inline silk_float silk_log2( double x ) 195 { 196 return ( silk_float )( 3.32192809488736 * log10( x ) ); 197 } 198 199 #ifdef __cplusplus 200 } 201 #endif 202 203 #endif /* SILK_SIGPROC_FLP_H */ 204
