media/libopus/silk/resampler_rom.c

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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 ***********************************************************************/
    28 #ifdef HAVE_CONFIG_H
    29 #include "config.h"
    30 #endif
    32 /* Filter coefficients for IIR/FIR polyphase resampling     *
    33  * Total size: 179 Words (358 Bytes)                        */
    35 #include "resampler_private.h"
    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 }; */
    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 };
    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 };
    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 };
    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 };
    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 };
    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 };
    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 };
    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 };

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