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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 /* compute autocorrelation */
72 void silk_autocorrelation_FLP(
73 silk_float *results, /* O result (length correlationCount) */
74 const silk_float *inputData, /* I input data to correlate */
75 opus_int inputDataSize, /* I length of input */
76 opus_int correlationCount /* I number of correlation taps to compute */
77 );
78
79 opus_int silk_pitch_analysis_core_FLP( /* O Voicing estimate: 0 voiced, 1 unvoiced */
80 const silk_float *frame, /* I Signal of length PE_FRAME_LENGTH_MS*Fs_kHz */
81 opus_int *pitch_out, /* O Pitch lag values [nb_subfr] */
82 opus_int16 *lagIndex, /* O Lag Index */
83 opus_int8 *contourIndex, /* O Pitch contour Index */
84 silk_float *LTPCorr, /* I/O Normalized correlation; input: value from previous frame */
85 opus_int prevLag, /* I Last lag of previous frame; set to zero is unvoiced */
86 const silk_float search_thres1, /* I First stage threshold for lag candidates 0 - 1 */
87 const silk_float search_thres2, /* I Final threshold for lag candidates 0 - 1 */
88 const opus_int Fs_kHz, /* I sample frequency (kHz) */
89 const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */
90 const opus_int nb_subfr, /* I Number of 5 ms subframes */
91 int arch /* I Run-time architecture */
92 );
93
94 void silk_insertion_sort_decreasing_FLP(
95 silk_float *a, /* I/O Unsorted / Sorted vector */
96 opus_int *idx, /* O Index vector for the sorted elements */
97 const opus_int L, /* I Vector length */
98 const opus_int K /* I Number of correctly sorted positions */
99 );
100
101 /* Compute reflection coefficients from input signal */
102 silk_float silk_burg_modified_FLP( /* O returns residual energy */
103 silk_float A[], /* O prediction coefficients (length order) */
104 const silk_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */
105 const silk_float minInvGain, /* I minimum inverse prediction gain */
106 const opus_int subfr_length, /* I input signal subframe length (incl. D preceding samples) */
107 const opus_int nb_subfr, /* I number of subframes stacked in x */
108 const opus_int D /* I order */
109 );
110
111 /* multiply a vector by a constant */
112 void silk_scale_vector_FLP(
113 silk_float *data1,
114 silk_float gain,
115 opus_int dataSize
116 );
117
118 /* copy and multiply a vector by a constant */
119 void silk_scale_copy_vector_FLP(
120 silk_float *data_out,
121 const silk_float *data_in,
122 silk_float gain,
123 opus_int dataSize
124 );
125
126 /* inner product of two silk_float arrays, with result as double */
127 double silk_inner_product_FLP(
128 const silk_float *data1,
129 const silk_float *data2,
130 opus_int dataSize
131 );
132
133 /* sum of squares of a silk_float array, with result as double */
134 double silk_energy_FLP(
135 const silk_float *data,
136 opus_int dataSize
137 );
138
139 /********************************************************************/
140 /* MACROS */
141 /********************************************************************/
142
143 #define PI (3.1415926536f)
144
145 #define silk_min_float( a, b ) (((a) < (b)) ? (a) : (b))
146 #define silk_max_float( a, b ) (((a) > (b)) ? (a) : (b))
147 #define silk_abs_float( a ) ((silk_float)fabs(a))
148
149 /* sigmoid function */
silk_sigmoid(silk_float x)150 static OPUS_INLINE silk_float silk_sigmoid( silk_float x )
151 {
152 return (silk_float)(1.0 / (1.0 + exp(-x)));
153 }
154
155 /* floating-point to integer conversion (rounding) */
silk_float2int(silk_float x)156 static OPUS_INLINE opus_int32 silk_float2int( silk_float x )
157 {
158 return (opus_int32)float2int( x );
159 }
160
161 /* floating-point to integer conversion (rounding) */
silk_float2short_array(opus_int16 * out,const silk_float * in,opus_int32 length)162 static OPUS_INLINE void silk_float2short_array(
163 opus_int16 *out,
164 const silk_float *in,
165 opus_int32 length
166 )
167 {
168 opus_int32 k;
169 for( k = length - 1; k >= 0; k-- ) {
170 out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) );
171 }
172 }
173
174 /* integer to floating-point conversion */
silk_short2float_array(silk_float * out,const opus_int16 * in,opus_int32 length)175 static OPUS_INLINE void silk_short2float_array(
176 silk_float *out,
177 const opus_int16 *in,
178 opus_int32 length
179 )
180 {
181 opus_int32 k;
182 for( k = length - 1; k >= 0; k-- ) {
183 out[k] = (silk_float)in[k];
184 }
185 }
186
187 /* using log2() helps the fixed-point conversion */
silk_log2(double x)188 static OPUS_INLINE silk_float silk_log2( double x )
189 {
190 return ( silk_float )( 3.32192809488736 * log10( x ) );
191 }
192
193 #ifdef __cplusplus
194 }
195 #endif
196
197 #endif /* SILK_SIGPROC_FLP_H */
198