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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 "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 */
silk_sigmoid(silk_float x)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) */
silk_float2int(silk_float x)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) */
silk_float2short_array(opus_int16 * out,const silk_float * in,opus_int32 length)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 */
silk_short2float_array(silk_float * out,const opus_int16 * in,opus_int32 length)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 */
silk_log2(double x)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 */
206