Line data Source code
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 : /* 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 */
150 0 : static OPUS_INLINE silk_float silk_sigmoid( silk_float x )
151 : {
152 0 : return (silk_float)(1.0 / (1.0 + exp(-x)));
153 : }
154 :
155 : /* floating-point to integer conversion (rounding) */
156 0 : static OPUS_INLINE opus_int32 silk_float2int( silk_float x )
157 : {
158 0 : return (opus_int32)float2int( x );
159 : }
160 :
161 : /* floating-point to integer conversion (rounding) */
162 0 : 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 0 : for( k = length - 1; k >= 0; k-- ) {
170 0 : out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) );
171 : }
172 0 : }
173 :
174 : /* integer to floating-point conversion */
175 0 : 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 0 : for( k = length - 1; k >= 0; k-- ) {
183 0 : out[k] = (silk_float)in[k];
184 : }
185 0 : }
186 :
187 : /* using log2() helps the fixed-point conversion */
188 0 : static OPUS_INLINE silk_float silk_log2( double x )
189 : {
190 0 : return ( silk_float )( 3.32192809488736 * log10( x ) );
191 : }
192 :
193 : #ifdef __cplusplus
194 : }
195 : #endif
196 :
197 : #endif /* SILK_SIGPROC_FLP_H */
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