SigProc_FLP.h (9825B)
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 "main.h" 34 #include <math.h> 35 36 #ifdef __cplusplus 37 extern "C" 38 { 39 #endif 40 41 /********************************************************************/ 42 /* SIGNAL PROCESSING FUNCTIONS */ 43 /********************************************************************/ 44 45 /* Chirp (bw expand) LP AR filter */ 46 void silk_bwexpander_FLP( 47 silk_float *ar, /* I/O AR filter to be expanded (without leading 1) */ 48 const opus_int d, /* I length of ar */ 49 const silk_float chirp /* I chirp factor (typically in range (0..1) ) */ 50 ); 51 52 /* compute inverse of LPC prediction gain, and */ 53 /* test if LPC coefficients are stable (all poles within unit circle) */ 54 /* this code is based on silk_FLP_a2k() */ 55 silk_float silk_LPC_inverse_pred_gain_FLP( /* O return inverse prediction gain, energy domain */ 56 const silk_float *A, /* I prediction coefficients [order] */ 57 opus_int32 order /* I prediction order */ 58 ); 59 60 silk_float silk_schur_FLP( /* O returns residual energy */ 61 silk_float refl_coef[], /* O reflection coefficients (length order) */ 62 const silk_float auto_corr[], /* I autocorrelation sequence (length order+1) */ 63 opus_int order /* I order */ 64 ); 65 66 void silk_k2a_FLP( 67 silk_float *A, /* O prediction coefficients [order] */ 68 const silk_float *rc, /* I reflection coefficients [order] */ 69 opus_int32 order /* I prediction order */ 70 ); 71 72 /* compute autocorrelation */ 73 void silk_autocorrelation_FLP( 74 silk_float *results, /* O result (length correlationCount) */ 75 const silk_float *inputData, /* I input data to correlate */ 76 opus_int inputDataSize, /* I length of input */ 77 opus_int correlationCount, /* I number of correlation taps to compute */ 78 int arch 79 ); 80 81 opus_int silk_pitch_analysis_core_FLP( /* O Voicing estimate: 0 voiced, 1 unvoiced */ 82 const silk_float *frame, /* I Signal of length PE_FRAME_LENGTH_MS*Fs_kHz */ 83 opus_int *pitch_out, /* O Pitch lag values [nb_subfr] */ 84 opus_int16 *lagIndex, /* O Lag Index */ 85 opus_int8 *contourIndex, /* O Pitch contour Index */ 86 silk_float *LTPCorr, /* I/O Normalized correlation; input: value from previous frame */ 87 opus_int prevLag, /* I Last lag of previous frame; set to zero is unvoiced */ 88 const silk_float search_thres1, /* I First stage threshold for lag candidates 0 - 1 */ 89 const silk_float search_thres2, /* I Final threshold for lag candidates 0 - 1 */ 90 const opus_int Fs_kHz, /* I sample frequency (kHz) */ 91 const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */ 92 const opus_int nb_subfr, /* I Number of 5 ms subframes */ 93 int arch /* I Run-time architecture */ 94 ); 95 96 void silk_insertion_sort_decreasing_FLP( 97 silk_float *a, /* I/O Unsorted / Sorted vector */ 98 opus_int *idx, /* O Index vector for the sorted elements */ 99 const opus_int L, /* I Vector length */ 100 const opus_int K /* I Number of correctly sorted positions */ 101 ); 102 103 /* Compute reflection coefficients from input signal */ 104 silk_float silk_burg_modified_FLP( /* O returns residual energy */ 105 silk_float A[], /* O prediction coefficients (length order) */ 106 const silk_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */ 107 const silk_float minInvGain, /* I minimum inverse prediction gain */ 108 const opus_int subfr_length, /* I input signal subframe length (incl. D preceding samples) */ 109 const opus_int nb_subfr, /* I number of subframes stacked in x */ 110 const opus_int D, /* I order */ 111 int arch 112 ); 113 114 /* multiply a vector by a constant */ 115 void silk_scale_vector_FLP( 116 silk_float *data1, 117 silk_float gain, 118 opus_int dataSize 119 ); 120 121 /* copy and multiply a vector by a constant */ 122 void silk_scale_copy_vector_FLP( 123 silk_float *data_out, 124 const silk_float *data_in, 125 silk_float gain, 126 opus_int dataSize 127 ); 128 129 /* inner product of two silk_float arrays, with result as double */ 130 double silk_inner_product_FLP_c( 131 const silk_float *data1, 132 const silk_float *data2, 133 opus_int dataSize 134 ); 135 136 #ifndef OVERRIDE_inner_product_FLP 137 #define silk_inner_product_FLP(data1, data2, dataSize, arch) ((void)arch,silk_inner_product_FLP_c(data1, data2, dataSize)) 138 #endif 139 140 141 /* sum of squares of a silk_float array, with result as double */ 142 double silk_energy_FLP( 143 const silk_float *data, 144 opus_int dataSize 145 ); 146 147 /********************************************************************/ 148 /* MACROS */ 149 /********************************************************************/ 150 151 #define PI (3.1415926536f) 152 153 #define silk_min_float( a, b ) (((a) < (b)) ? (a) : (b)) 154 #define silk_max_float( a, b ) (((a) > (b)) ? (a) : (b)) 155 #define silk_abs_float( a ) ((silk_float)fabs(a)) 156 157 /* sigmoid function */ 158 static OPUS_INLINE silk_float silk_sigmoid( silk_float x ) 159 { 160 return (silk_float)(1.0 / (1.0 + exp(-x))); 161 } 162 163 /* floating-point to integer conversion (rounding) */ 164 static OPUS_INLINE opus_int32 silk_float2int( silk_float x ) 165 { 166 return (opus_int32)float2int( x ); 167 } 168 169 /* floating-point to integer conversion (rounding) */ 170 static OPUS_INLINE void silk_float2short_array( 171 opus_int16 *out, 172 const silk_float *in, 173 opus_int32 length 174 ) 175 { 176 opus_int32 k; 177 for( k = length - 1; k >= 0; k-- ) { 178 out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) ); 179 } 180 } 181 182 /* integer to floating-point conversion */ 183 static OPUS_INLINE void silk_short2float_array( 184 silk_float *out, 185 const opus_int16 *in, 186 opus_int32 length 187 ) 188 { 189 opus_int32 k; 190 for( k = length - 1; k >= 0; k-- ) { 191 out[k] = (silk_float)in[k]; 192 } 193 } 194 195 /* using log2() helps the fixed-point conversion */ 196 static OPUS_INLINE silk_float silk_log2( double x ) 197 { 198 return ( silk_float )( 3.32192809488736 * log10( x ) ); 199 } 200 201 #ifdef __cplusplus 202 } 203 #endif 204 205 #endif /* SILK_SIGPROC_FLP_H */