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comparison: media/libopus/silk/resampler_rom.c
media/libopus/silk/resampler_rom.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:43e85bf2aefa |
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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 /* 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 }; |
