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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 */
silk_sigmoid(silk_float x)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) */
silk_float2int(silk_float x)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) */
silk_float2short_array(opus_int16 * out,const silk_float * in,opus_int32 length)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 */
silk_short2float_array(silk_float * out,const opus_int16 * in,opus_int32 length)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 */
silk_log2(double x)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