michael@0: /***********************************************************************
michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0: Redistribution and use in source and binary forms, with or without
michael@0: modification, are permitted provided that the following conditions
michael@0: are met:
michael@0: - Redistributions of source code must retain the above copyright notice,
michael@0: this list of conditions and the following disclaimer.
michael@0: - Redistributions in binary form must reproduce the above copyright
michael@0: notice, this list of conditions and the following disclaimer in the
michael@0: documentation and/or other materials provided with the distribution.
michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0: names of specific contributors, may be used to endorse or promote
michael@0: products derived from this software without specific prior written
michael@0: permission.
michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0: POSSIBILITY OF SUCH DAMAGE.
michael@0: ***********************************************************************/
michael@0: 
michael@0: #ifdef HAVE_CONFIG_H
michael@0: #include "config.h"
michael@0: #endif
michael@0: 
michael@0: /* Filter coefficients for IIR/FIR polyphase resampling     *
michael@0:  * Total size: 179 Words (358 Bytes)                        */
michael@0: 
michael@0: #include "resampler_private.h"
michael@0: 
michael@0: /* Matlab code for the notch filter coefficients: */
michael@0: /* 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]) */
michael@0: /* 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)) */
michael@0: /* const opus_int16 silk_resampler_up2_hq_notch[ 4 ] = { 9634,  -7012,   7209,  30474 }; */
michael@0: 
michael@0: /* Tables with IIR and FIR coefficients for fractional downsamplers (123 Words) */
michael@0: silk_DWORD_ALIGN const opus_int16 silk_Resampler_3_4_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = {
michael@0: 	-20694, -13867,
michael@0: 	   -49,     64,     17,   -157,    353,   -496,    163,  11047,  22205,
michael@0: 	   -39,      6,     91,   -170,    186,     23,   -896,   6336,  19928,
michael@0: 	   -19,    -36,    102,    -89,    -24,    328,   -951,   2568,  15909,
michael@0: };
michael@0: 
michael@0: silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS[ 2 + 2 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = {
michael@0: 	-14457, -14019,
michael@0: 	    64,    128,   -122,     36,    310,   -768,    584,   9267,  17733,
michael@0: 	    12,    128,     18,   -142,    288,   -117,   -865,   4123,  14459,
michael@0: };
michael@0: 
michael@0: silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_2_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR1 / 2 ] = {
michael@0: 	   616, -14323,
michael@0: 	   -10,     39,     58,    -46,    -84,    120,    184,   -315,   -541,   1284,   5380,   9024,
michael@0: };
michael@0: 
michael@0: silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_3_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
michael@0: 	 16102, -15162,
michael@0: 	   -13,      0,     20,     26,      5,    -31,    -43,     -4,     65,     90,      7,   -157,   -248,    -44,    593,   1583,   2612,   3271,
michael@0: };
michael@0: 
michael@0: silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_4_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
michael@0: 	 22500, -15099,
michael@0: 	     3,    -14,    -20,    -15,      2,     25,     37,     25,    -16,    -71,   -107,    -79,     50,    292,    623,    982,   1288,   1464,
michael@0: };
michael@0: 
michael@0: silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_6_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
michael@0: 	 27540, -15257,
michael@0: 	    17,     12,      8,      1,    -10,    -22,    -30,    -32,    -22,      3,     44,    100,    168,    243,    317,    381,    429,    455,
michael@0: };
michael@0: 
michael@0: silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS_LQ[ 2 + 2 * 2 ] = {
michael@0:      -2797,  -6507,
michael@0:       4697,  10739,
michael@0:       1567,   8276,
michael@0: };
michael@0: 
michael@0: /* Table with interplation fractions of 1/24, 3/24, 5/24, ... , 23/24 : 23/24 (46 Words) */
michael@0: silk_DWORD_ALIGN const opus_int16 silk_resampler_frac_FIR_12[ 12 ][ RESAMPLER_ORDER_FIR_12 / 2 ] = {
michael@0: 	{  189,  -600,   617, 30567 },
michael@0: 	{  117,  -159, -1070, 29704 },
michael@0: 	{   52,   221, -2392, 28276 },
michael@0: 	{   -4,   529, -3350, 26341 },
michael@0: 	{  -48,   758, -3956, 23973 },
michael@0: 	{  -80,   905, -4235, 21254 },
michael@0: 	{  -99,   972, -4222, 18278 },
michael@0: 	{ -107,   967, -3957, 15143 },
michael@0: 	{ -103,   896, -3487, 11950 },
michael@0: 	{  -91,   773, -2865,  8798 },
michael@0: 	{  -71,   611, -2143,  5784 },
michael@0: 	{  -46,   425, -1375,  2996 },
michael@0: };