1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/resampler_rom.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,96 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +/* Filter coefficients for IIR/FIR polyphase resampling *
1.36 + * Total size: 179 Words (358 Bytes) */
1.37 +
1.38 +#include "resampler_private.h"
1.39 +
1.40 +/* Matlab code for the notch filter coefficients: */
1.41 +/* 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]) */
1.42 +/* 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)) */
1.43 +/* const opus_int16 silk_resampler_up2_hq_notch[ 4 ] = { 9634, -7012, 7209, 30474 }; */
1.44 +
1.45 +/* Tables with IIR and FIR coefficients for fractional downsamplers (123 Words) */
1.46 +silk_DWORD_ALIGN const opus_int16 silk_Resampler_3_4_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = {
1.47 + -20694, -13867,
1.48 + -49, 64, 17, -157, 353, -496, 163, 11047, 22205,
1.49 + -39, 6, 91, -170, 186, 23, -896, 6336, 19928,
1.50 + -19, -36, 102, -89, -24, 328, -951, 2568, 15909,
1.51 +};
1.52 +
1.53 +silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS[ 2 + 2 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = {
1.54 + -14457, -14019,
1.55 + 64, 128, -122, 36, 310, -768, 584, 9267, 17733,
1.56 + 12, 128, 18, -142, 288, -117, -865, 4123, 14459,
1.57 +};
1.58 +
1.59 +silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_2_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR1 / 2 ] = {
1.60 + 616, -14323,
1.61 + -10, 39, 58, -46, -84, 120, 184, -315, -541, 1284, 5380, 9024,
1.62 +};
1.63 +
1.64 +silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_3_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
1.65 + 16102, -15162,
1.66 + -13, 0, 20, 26, 5, -31, -43, -4, 65, 90, 7, -157, -248, -44, 593, 1583, 2612, 3271,
1.67 +};
1.68 +
1.69 +silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_4_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
1.70 + 22500, -15099,
1.71 + 3, -14, -20, -15, 2, 25, 37, 25, -16, -71, -107, -79, 50, 292, 623, 982, 1288, 1464,
1.72 +};
1.73 +
1.74 +silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_6_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
1.75 + 27540, -15257,
1.76 + 17, 12, 8, 1, -10, -22, -30, -32, -22, 3, 44, 100, 168, 243, 317, 381, 429, 455,
1.77 +};
1.78 +
1.79 +silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS_LQ[ 2 + 2 * 2 ] = {
1.80 + -2797, -6507,
1.81 + 4697, 10739,
1.82 + 1567, 8276,
1.83 +};
1.84 +
1.85 +/* Table with interplation fractions of 1/24, 3/24, 5/24, ... , 23/24 : 23/24 (46 Words) */
1.86 +silk_DWORD_ALIGN const opus_int16 silk_resampler_frac_FIR_12[ 12 ][ RESAMPLER_ORDER_FIR_12 / 2 ] = {
1.87 + { 189, -600, 617, 30567 },
1.88 + { 117, -159, -1070, 29704 },
1.89 + { 52, 221, -2392, 28276 },
1.90 + { -4, 529, -3350, 26341 },
1.91 + { -48, 758, -3956, 23973 },
1.92 + { -80, 905, -4235, 21254 },
1.93 + { -99, 972, -4222, 18278 },
1.94 + { -107, 967, -3957, 15143 },
1.95 + { -103, 896, -3487, 11950 },
1.96 + { -91, 773, -2865, 8798 },
1.97 + { -71, 611, -2143, 5784 },
1.98 + { -46, 425, -1375, 2996 },
1.99 +};
