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4 modification, are permitted provided that the following conditions
5 are met:
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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "SigProc_FIX.h"
33 #include "resampler_private.h"
34 #include "stack_alloc.h"
35
silk_resampler_private_down_FIR_INTERPOL(opus_int16 * out,opus_int32 * buf,const opus_int16 * FIR_Coefs,opus_int FIR_Order,opus_int FIR_Fracs,opus_int32 max_index_Q16,opus_int32 index_increment_Q16)36 static OPUS_INLINE opus_int16 *silk_resampler_private_down_FIR_INTERPOL(
37 opus_int16 *out,
38 opus_int32 *buf,
39 const opus_int16 *FIR_Coefs,
40 opus_int FIR_Order,
41 opus_int FIR_Fracs,
42 opus_int32 max_index_Q16,
43 opus_int32 index_increment_Q16
44 )
45 {
46 opus_int32 index_Q16, res_Q6;
47 opus_int32 *buf_ptr;
48 opus_int32 interpol_ind;
49 const opus_int16 *interpol_ptr;
50
51 switch( FIR_Order ) {
52 case RESAMPLER_DOWN_ORDER_FIR0:
53 for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
54 /* Integer part gives pointer to buffered input */
55 buf_ptr = buf + silk_RSHIFT( index_Q16, 16 );
56
57 /* Fractional part gives interpolation coefficients */
58 interpol_ind = silk_SMULWB( index_Q16 & 0xFFFF, FIR_Fracs );
59
60 /* Inner product */
61 interpol_ptr = &FIR_Coefs[ RESAMPLER_DOWN_ORDER_FIR0 / 2 * interpol_ind ];
62 res_Q6 = silk_SMULWB( buf_ptr[ 0 ], interpol_ptr[ 0 ] );
63 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 1 ], interpol_ptr[ 1 ] );
64 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 2 ], interpol_ptr[ 2 ] );
65 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 3 ], interpol_ptr[ 3 ] );
66 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 4 ], interpol_ptr[ 4 ] );
67 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 5 ], interpol_ptr[ 5 ] );
68 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 6 ], interpol_ptr[ 6 ] );
69 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 7 ], interpol_ptr[ 7 ] );
70 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 8 ], interpol_ptr[ 8 ] );
71 interpol_ptr = &FIR_Coefs[ RESAMPLER_DOWN_ORDER_FIR0 / 2 * ( FIR_Fracs - 1 - interpol_ind ) ];
72 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 17 ], interpol_ptr[ 0 ] );
73 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 16 ], interpol_ptr[ 1 ] );
74 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 15 ], interpol_ptr[ 2 ] );
75 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 14 ], interpol_ptr[ 3 ] );
76 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 13 ], interpol_ptr[ 4 ] );
77 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 12 ], interpol_ptr[ 5 ] );
78 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 11 ], interpol_ptr[ 6 ] );
79 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 10 ], interpol_ptr[ 7 ] );
80 res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 9 ], interpol_ptr[ 8 ] );
81
82 /* Scale down, saturate and store in output array */
83 *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
84 }
85 break;
86 case RESAMPLER_DOWN_ORDER_FIR1:
87 for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
88 /* Integer part gives pointer to buffered input */
89 buf_ptr = buf + silk_RSHIFT( index_Q16, 16 );
90
91 /* Inner product */
92 res_Q6 = silk_SMULWB( silk_ADD32( buf_ptr[ 0 ], buf_ptr[ 23 ] ), FIR_Coefs[ 0 ] );
93 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 1 ], buf_ptr[ 22 ] ), FIR_Coefs[ 1 ] );
94 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 2 ], buf_ptr[ 21 ] ), FIR_Coefs[ 2 ] );
95 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 3 ], buf_ptr[ 20 ] ), FIR_Coefs[ 3 ] );
96 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 4 ], buf_ptr[ 19 ] ), FIR_Coefs[ 4 ] );
97 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 5 ], buf_ptr[ 18 ] ), FIR_Coefs[ 5 ] );
98 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 6 ], buf_ptr[ 17 ] ), FIR_Coefs[ 6 ] );
99 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 7 ], buf_ptr[ 16 ] ), FIR_Coefs[ 7 ] );
100 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 8 ], buf_ptr[ 15 ] ), FIR_Coefs[ 8 ] );
101 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 9 ], buf_ptr[ 14 ] ), FIR_Coefs[ 9 ] );
102 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 10 ], buf_ptr[ 13 ] ), FIR_Coefs[ 10 ] );
103 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 11 ], buf_ptr[ 12 ] ), FIR_Coefs[ 11 ] );
104
105 /* Scale down, saturate and store in output array */
106 *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
107 }
108 break;
109 case RESAMPLER_DOWN_ORDER_FIR2:
110 for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
111 /* Integer part gives pointer to buffered input */
112 buf_ptr = buf + silk_RSHIFT( index_Q16, 16 );
113
114 /* Inner product */
115 res_Q6 = silk_SMULWB( silk_ADD32( buf_ptr[ 0 ], buf_ptr[ 35 ] ), FIR_Coefs[ 0 ] );
116 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 1 ], buf_ptr[ 34 ] ), FIR_Coefs[ 1 ] );
117 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 2 ], buf_ptr[ 33 ] ), FIR_Coefs[ 2 ] );
118 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 3 ], buf_ptr[ 32 ] ), FIR_Coefs[ 3 ] );
119 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 4 ], buf_ptr[ 31 ] ), FIR_Coefs[ 4 ] );
120 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 5 ], buf_ptr[ 30 ] ), FIR_Coefs[ 5 ] );
121 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 6 ], buf_ptr[ 29 ] ), FIR_Coefs[ 6 ] );
122 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 7 ], buf_ptr[ 28 ] ), FIR_Coefs[ 7 ] );
123 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 8 ], buf_ptr[ 27 ] ), FIR_Coefs[ 8 ] );
124 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 9 ], buf_ptr[ 26 ] ), FIR_Coefs[ 9 ] );
125 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 10 ], buf_ptr[ 25 ] ), FIR_Coefs[ 10 ] );
126 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 11 ], buf_ptr[ 24 ] ), FIR_Coefs[ 11 ] );
127 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 12 ], buf_ptr[ 23 ] ), FIR_Coefs[ 12 ] );
128 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 13 ], buf_ptr[ 22 ] ), FIR_Coefs[ 13 ] );
129 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 14 ], buf_ptr[ 21 ] ), FIR_Coefs[ 14 ] );
130 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 15 ], buf_ptr[ 20 ] ), FIR_Coefs[ 15 ] );
131 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 16 ], buf_ptr[ 19 ] ), FIR_Coefs[ 16 ] );
132 res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 17 ], buf_ptr[ 18 ] ), FIR_Coefs[ 17 ] );
133
134 /* Scale down, saturate and store in output array */
135 *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
136 }
137 break;
138 default:
139 silk_assert( 0 );
140 }
141 return out;
142 }
143
144 /* Resample with a 2nd order AR filter followed by FIR interpolation */
silk_resampler_private_down_FIR(void * SS,opus_int16 out[],const opus_int16 in[],opus_int32 inLen)145 void silk_resampler_private_down_FIR(
146 void *SS, /* I/O Resampler state */
147 opus_int16 out[], /* O Output signal */
148 const opus_int16 in[], /* I Input signal */
149 opus_int32 inLen /* I Number of input samples */
150 )
151 {
152 silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
153 opus_int32 nSamplesIn;
154 opus_int32 max_index_Q16, index_increment_Q16;
155 VARDECL( opus_int32, buf );
156 const opus_int16 *FIR_Coefs;
157 SAVE_STACK;
158
159 ALLOC( buf, S->batchSize + S->FIR_Order, opus_int32 );
160
161 /* Copy buffered samples to start of buffer */
162 silk_memcpy( buf, S->sFIR.i32, S->FIR_Order * sizeof( opus_int32 ) );
163
164 FIR_Coefs = &S->Coefs[ 2 ];
165
166 /* Iterate over blocks of frameSizeIn input samples */
167 index_increment_Q16 = S->invRatio_Q16;
168 while( 1 ) {
169 nSamplesIn = silk_min( inLen, S->batchSize );
170
171 /* Second-order AR filter (output in Q8) */
172 silk_resampler_private_AR2( S->sIIR, &buf[ S->FIR_Order ], in, S->Coefs, nSamplesIn );
173
174 max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 );
175
176 /* Interpolate filtered signal */
177 out = silk_resampler_private_down_FIR_INTERPOL( out, buf, FIR_Coefs, S->FIR_Order,
178 S->FIR_Fracs, max_index_Q16, index_increment_Q16 );
179
180 in += nSamplesIn;
181 inLen -= nSamplesIn;
182
183 if( inLen > 1 ) {
184 /* More iterations to do; copy last part of filtered signal to beginning of buffer */
185 silk_memcpy( buf, &buf[ nSamplesIn ], S->FIR_Order * sizeof( opus_int32 ) );
186 } else {
187 break;
188 }
189 }
190
191 /* Copy last part of filtered signal to the state for the next call */
192 silk_memcpy( S->sFIR.i32, &buf[ nSamplesIn ], S->FIR_Order * sizeof( opus_int32 ) );
193 RESTORE_STACK;
194 }
195