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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include <stdlib.h>
33 #include "main_FLP.h"
34
35 /************************************************/
36 /* LPC analysis filter */
37 /* NB! State is kept internally and the */
38 /* filter always starts with zero state */
39 /* first Order output samples are set to zero */
40 /************************************************/
41
42 /* 16th order LPC analysis filter, does not write first 16 samples */
silk_LPC_analysis_filter16_FLP(silk_float r_LPC[],const silk_float PredCoef[],const silk_float s[],const opus_int length)43 static OPUS_INLINE void silk_LPC_analysis_filter16_FLP(
44 silk_float r_LPC[], /* O LPC residual signal */
45 const silk_float PredCoef[], /* I LPC coefficients */
46 const silk_float s[], /* I Input signal */
47 const opus_int length /* I Length of input signal */
48 )
49 {
50 opus_int ix;
51 silk_float LPC_pred;
52 const silk_float *s_ptr;
53
54 for( ix = 16; ix < length; ix++ ) {
55 s_ptr = &s[ix - 1];
56
57 /* short-term prediction */
58 LPC_pred = s_ptr[ 0 ] * PredCoef[ 0 ] +
59 s_ptr[ -1 ] * PredCoef[ 1 ] +
60 s_ptr[ -2 ] * PredCoef[ 2 ] +
61 s_ptr[ -3 ] * PredCoef[ 3 ] +
62 s_ptr[ -4 ] * PredCoef[ 4 ] +
63 s_ptr[ -5 ] * PredCoef[ 5 ] +
64 s_ptr[ -6 ] * PredCoef[ 6 ] +
65 s_ptr[ -7 ] * PredCoef[ 7 ] +
66 s_ptr[ -8 ] * PredCoef[ 8 ] +
67 s_ptr[ -9 ] * PredCoef[ 9 ] +
68 s_ptr[ -10 ] * PredCoef[ 10 ] +
69 s_ptr[ -11 ] * PredCoef[ 11 ] +
70 s_ptr[ -12 ] * PredCoef[ 12 ] +
71 s_ptr[ -13 ] * PredCoef[ 13 ] +
72 s_ptr[ -14 ] * PredCoef[ 14 ] +
73 s_ptr[ -15 ] * PredCoef[ 15 ];
74
75 /* prediction error */
76 r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
77 }
78 }
79
80 /* 12th order LPC analysis filter, does not write first 12 samples */
silk_LPC_analysis_filter12_FLP(silk_float r_LPC[],const silk_float PredCoef[],const silk_float s[],const opus_int length)81 static OPUS_INLINE void silk_LPC_analysis_filter12_FLP(
82 silk_float r_LPC[], /* O LPC residual signal */
83 const silk_float PredCoef[], /* I LPC coefficients */
84 const silk_float s[], /* I Input signal */
85 const opus_int length /* I Length of input signal */
86 )
87 {
88 opus_int ix;
89 silk_float LPC_pred;
90 const silk_float *s_ptr;
91
92 for( ix = 12; ix < length; ix++ ) {
93 s_ptr = &s[ix - 1];
94
95 /* short-term prediction */
96 LPC_pred = s_ptr[ 0 ] * PredCoef[ 0 ] +
97 s_ptr[ -1 ] * PredCoef[ 1 ] +
98 s_ptr[ -2 ] * PredCoef[ 2 ] +
99 s_ptr[ -3 ] * PredCoef[ 3 ] +
100 s_ptr[ -4 ] * PredCoef[ 4 ] +
101 s_ptr[ -5 ] * PredCoef[ 5 ] +
102 s_ptr[ -6 ] * PredCoef[ 6 ] +
103 s_ptr[ -7 ] * PredCoef[ 7 ] +
104 s_ptr[ -8 ] * PredCoef[ 8 ] +
105 s_ptr[ -9 ] * PredCoef[ 9 ] +
106 s_ptr[ -10 ] * PredCoef[ 10 ] +
107 s_ptr[ -11 ] * PredCoef[ 11 ];
108
109 /* prediction error */
110 r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
111 }
112 }
113
114 /* 10th order LPC analysis filter, does not write first 10 samples */
silk_LPC_analysis_filter10_FLP(silk_float r_LPC[],const silk_float PredCoef[],const silk_float s[],const opus_int length)115 static OPUS_INLINE void silk_LPC_analysis_filter10_FLP(
116 silk_float r_LPC[], /* O LPC residual signal */
117 const silk_float PredCoef[], /* I LPC coefficients */
118 const silk_float s[], /* I Input signal */
119 const opus_int length /* I Length of input signal */
120 )
121 {
122 opus_int ix;
123 silk_float LPC_pred;
124 const silk_float *s_ptr;
125
126 for( ix = 10; ix < length; ix++ ) {
127 s_ptr = &s[ix - 1];
128
129 /* short-term prediction */
130 LPC_pred = s_ptr[ 0 ] * PredCoef[ 0 ] +
131 s_ptr[ -1 ] * PredCoef[ 1 ] +
132 s_ptr[ -2 ] * PredCoef[ 2 ] +
133 s_ptr[ -3 ] * PredCoef[ 3 ] +
134 s_ptr[ -4 ] * PredCoef[ 4 ] +
135 s_ptr[ -5 ] * PredCoef[ 5 ] +
136 s_ptr[ -6 ] * PredCoef[ 6 ] +
137 s_ptr[ -7 ] * PredCoef[ 7 ] +
138 s_ptr[ -8 ] * PredCoef[ 8 ] +
139 s_ptr[ -9 ] * PredCoef[ 9 ];
140
141 /* prediction error */
142 r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
143 }
144 }
145
146 /* 8th order LPC analysis filter, does not write first 8 samples */
silk_LPC_analysis_filter8_FLP(silk_float r_LPC[],const silk_float PredCoef[],const silk_float s[],const opus_int length)147 static OPUS_INLINE void silk_LPC_analysis_filter8_FLP(
148 silk_float r_LPC[], /* O LPC residual signal */
149 const silk_float PredCoef[], /* I LPC coefficients */
150 const silk_float s[], /* I Input signal */
151 const opus_int length /* I Length of input signal */
152 )
153 {
154 opus_int ix;
155 silk_float LPC_pred;
156 const silk_float *s_ptr;
157
158 for( ix = 8; ix < length; ix++ ) {
159 s_ptr = &s[ix - 1];
160
161 /* short-term prediction */
162 LPC_pred = s_ptr[ 0 ] * PredCoef[ 0 ] +
163 s_ptr[ -1 ] * PredCoef[ 1 ] +
164 s_ptr[ -2 ] * PredCoef[ 2 ] +
165 s_ptr[ -3 ] * PredCoef[ 3 ] +
166 s_ptr[ -4 ] * PredCoef[ 4 ] +
167 s_ptr[ -5 ] * PredCoef[ 5 ] +
168 s_ptr[ -6 ] * PredCoef[ 6 ] +
169 s_ptr[ -7 ] * PredCoef[ 7 ];
170
171 /* prediction error */
172 r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
173 }
174 }
175
176 /* 6th order LPC analysis filter, does not write first 6 samples */
silk_LPC_analysis_filter6_FLP(silk_float r_LPC[],const silk_float PredCoef[],const silk_float s[],const opus_int length)177 static OPUS_INLINE void silk_LPC_analysis_filter6_FLP(
178 silk_float r_LPC[], /* O LPC residual signal */
179 const silk_float PredCoef[], /* I LPC coefficients */
180 const silk_float s[], /* I Input signal */
181 const opus_int length /* I Length of input signal */
182 )
183 {
184 opus_int ix;
185 silk_float LPC_pred;
186 const silk_float *s_ptr;
187
188 for( ix = 6; ix < length; ix++ ) {
189 s_ptr = &s[ix - 1];
190
191 /* short-term prediction */
192 LPC_pred = s_ptr[ 0 ] * PredCoef[ 0 ] +
193 s_ptr[ -1 ] * PredCoef[ 1 ] +
194 s_ptr[ -2 ] * PredCoef[ 2 ] +
195 s_ptr[ -3 ] * PredCoef[ 3 ] +
196 s_ptr[ -4 ] * PredCoef[ 4 ] +
197 s_ptr[ -5 ] * PredCoef[ 5 ];
198
199 /* prediction error */
200 r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
201 }
202 }
203
204 /************************************************/
205 /* LPC analysis filter */
206 /* NB! State is kept internally and the */
207 /* filter always starts with zero state */
208 /* first Order output samples are set to zero */
209 /************************************************/
silk_LPC_analysis_filter_FLP(silk_float r_LPC[],const silk_float PredCoef[],const silk_float s[],const opus_int length,const opus_int Order)210 void silk_LPC_analysis_filter_FLP(
211 silk_float r_LPC[], /* O LPC residual signal */
212 const silk_float PredCoef[], /* I LPC coefficients */
213 const silk_float s[], /* I Input signal */
214 const opus_int length, /* I Length of input signal */
215 const opus_int Order /* I LPC order */
216 )
217 {
218 silk_assert( Order <= length );
219
220 switch( Order ) {
221 case 6:
222 silk_LPC_analysis_filter6_FLP( r_LPC, PredCoef, s, length );
223 break;
224
225 case 8:
226 silk_LPC_analysis_filter8_FLP( r_LPC, PredCoef, s, length );
227 break;
228
229 case 10:
230 silk_LPC_analysis_filter10_FLP( r_LPC, PredCoef, s, length );
231 break;
232
233 case 12:
234 silk_LPC_analysis_filter12_FLP( r_LPC, PredCoef, s, length );
235 break;
236
237 case 16:
238 silk_LPC_analysis_filter16_FLP( r_LPC, PredCoef, s, length );
239 break;
240
241 default:
242 silk_assert( 0 );
243 break;
244 }
245
246 /* Set first Order output samples to zero */
247 silk_memset( r_LPC, 0, Order * sizeof( silk_float ) );
248 }
249
250