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 int arch /* I Run-time architecture */ 99 ); 100 101 void silk_insertion_sort_decreasing_FLP( 102 silk_float *a, /* I/O Unsorted / Sorted vector */ 103 opus_int *idx, /* O Index vector for the sorted elements */ 104 const opus_int L, /* I Vector length */ 105 const opus_int K /* I Number of correctly sorted positions */ 106 ); 107 108 /* Compute reflection coefficients from input signal */ 109 silk_float silk_burg_modified_FLP( /* O returns residual energy */ 110 silk_float A[], /* O prediction coefficients (length order) */ 111 const silk_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */ 112 const silk_float minInvGain, /* I minimum inverse prediction gain */ 113 const opus_int subfr_length, /* I input signal subframe length (incl. D preceding samples) */ 114 const opus_int nb_subfr, /* I number of subframes stacked in x */ 115 const opus_int D /* I order */ 116 ); 117 118 /* multiply a vector by a constant */ 119 void silk_scale_vector_FLP( 120 silk_float *data1, 121 silk_float gain, 122 opus_int dataSize 123 ); 124 125 /* copy and multiply a vector by a constant */ 126 void silk_scale_copy_vector_FLP( 127 silk_float *data_out, 128 const silk_float *data_in, 129 silk_float gain, 130 opus_int dataSize 131 ); 132 133 /* inner product of two silk_float arrays, with result as double */ 134 double silk_inner_product_FLP( 135 const silk_float *data1, 136 const silk_float *data2, 137 opus_int dataSize 138 ); 139 140 /* sum of squares of a silk_float array, with result as double */ 141 double silk_energy_FLP( 142 const silk_float *data, 143 opus_int dataSize 144 ); 145 146 /********************************************************************/ 147 /* MACROS */ 148 /********************************************************************/ 149 150 #define PI (3.1415926536f) 151 152 #define silk_min_float( a, b ) (((a) < (b)) ? (a) : (b)) 153 #define silk_max_float( a, b ) (((a) > (b)) ? (a) : (b)) 154 #define silk_abs_float( a ) ((silk_float)fabs(a)) 155 156 /* sigmoid function */ 157 static OPUS_INLINE silk_float silk_sigmoid( silk_float x ) 158 { 159 return (silk_float)(1.0 / (1.0 + exp(-x))); 160 } 161 162 /* floating-point to integer conversion (rounding) */ 163 static OPUS_INLINE opus_int32 silk_float2int( silk_float x ) 164 { 165 return (opus_int32)float2int( x ); 166 } 167 168 /* floating-point to integer conversion (rounding) */ 169 static OPUS_INLINE void silk_float2short_array( 170 opus_int16 *out, 171 const silk_float *in, 172 opus_int32 length 173 ) 174 { 175 opus_int32 k; 176 for( k = length - 1; k >= 0; k-- ) { 177 out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) ); 178 } 179 } 180 181 /* integer to floating-point conversion */ 182 static OPUS_INLINE void silk_short2float_array( 183 silk_float *out, 184 const opus_int16 *in, 185 opus_int32 length 186 ) 187 { 188 opus_int32 k; 189 for( k = length - 1; k >= 0; k-- ) { 190 out[k] = (silk_float)in[k]; 191 } 192 } 193 194 /* using log2() helps the fixed-point conversion */ 195 static OPUS_INLINE silk_float silk_log2( double x ) 196 { 197 return ( silk_float )( 3.32192809488736 * log10( x ) ); 198 } 199 200 #ifdef __cplusplus 201 } 202 #endif 203 204 #endif /* SILK_SIGPROC_FLP_H */ 205
