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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/resampler_rom.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/resampler_rom.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/resampler_rom.c b/lib/rbcodec/codecs/libopus/silk/resampler_rom.c new file mode 100644 index 0000000000..bbbd6d1690 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/resampler_rom.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 "opus_config.h" | ||
30 | #endif | ||
31 | |||
32 | /* Filter coefficients for IIR/FIR polyphase resampling * | ||
33 | * Total size: 179 Words (358 Bytes) */ | ||
34 | |||
35 | #include "resampler_private.h" | ||
36 | |||
37 | /* Matlab code for the notch filter coefficients: */ | ||
38 | /* B = [1, 0.147, 1]; A = [1, 0.107, 0.89]; G = 0.93; freqz(G * B, A, 2^14, 16e3); axis([0, 8000, -10, 1]) */ | ||
39 | /* fprintf('\t%6d, %6d, %6d, %6d\n', round(B(2)*2^16), round(-A(2)*2^16), round((1-A(3))*2^16), round(G*2^15)) */ | ||
40 | /* const opus_int16 silk_resampler_up2_hq_notch[ 4 ] = { 9634, -7012, 7209, 30474 }; */ | ||
41 | |||
42 | /* Tables with IIR and FIR coefficients for fractional downsamplers (123 Words) */ | ||
43 | silk_DWORD_ALIGN const opus_int16 silk_Resampler_3_4_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = { | ||
44 | -20694, -13867, | ||
45 | -49, 64, 17, -157, 353, -496, 163, 11047, 22205, | ||
46 | -39, 6, 91, -170, 186, 23, -896, 6336, 19928, | ||
47 | -19, -36, 102, -89, -24, 328, -951, 2568, 15909, | ||
48 | }; | ||
49 | |||
50 | silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS[ 2 + 2 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = { | ||
51 | -14457, -14019, | ||
52 | 64, 128, -122, 36, 310, -768, 584, 9267, 17733, | ||
53 | 12, 128, 18, -142, 288, -117, -865, 4123, 14459, | ||
54 | }; | ||
55 | |||
56 | silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_2_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR1 / 2 ] = { | ||
57 | 616, -14323, | ||
58 | -10, 39, 58, -46, -84, 120, 184, -315, -541, 1284, 5380, 9024, | ||
59 | }; | ||
60 | |||
61 | silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_3_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = { | ||
62 | 16102, -15162, | ||
63 | -13, 0, 20, 26, 5, -31, -43, -4, 65, 90, 7, -157, -248, -44, 593, 1583, 2612, 3271, | ||
64 | }; | ||
65 | |||
66 | silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_4_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = { | ||
67 | 22500, -15099, | ||
68 | 3, -14, -20, -15, 2, 25, 37, 25, -16, -71, -107, -79, 50, 292, 623, 982, 1288, 1464, | ||
69 | }; | ||
70 | |||
71 | silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_6_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = { | ||
72 | 27540, -15257, | ||
73 | 17, 12, 8, 1, -10, -22, -30, -32, -22, 3, 44, 100, 168, 243, 317, 381, 429, 455, | ||
74 | }; | ||
75 | |||
76 | silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS_LQ[ 2 + 2 * 2 ] = { | ||
77 | -2797, -6507, | ||
78 | 4697, 10739, | ||
79 | 1567, 8276, | ||
80 | }; | ||
81 | |||
82 | /* Table with interplation fractions of 1/24, 3/24, 5/24, ... , 23/24 : 23/24 (46 Words) */ | ||
83 | silk_DWORD_ALIGN const opus_int16 silk_resampler_frac_FIR_12[ 12 ][ RESAMPLER_ORDER_FIR_12 / 2 ] = { | ||
84 | { 189, -600, 617, 30567 }, | ||
85 | { 117, -159, -1070, 29704 }, | ||
86 | { 52, 221, -2392, 28276 }, | ||
87 | { -4, 529, -3350, 26341 }, | ||
88 | { -48, 758, -3956, 23973 }, | ||
89 | { -80, 905, -4235, 21254 }, | ||
90 | { -99, 972, -4222, 18278 }, | ||
91 | { -107, 967, -3957, 15143 }, | ||
92 | { -103, 896, -3487, 11950 }, | ||
93 | { -91, 773, -2865, 8798 }, | ||
94 | { -71, 611, -2143, 5784 }, | ||
95 | { -46, 425, -1375, 2996 }, | ||
96 | }; | ||