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