filter.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 
/*
 * Fixed-point sampling rate conversion library
 * Developed by Ken Cooke ([e-mail])
 * May 2003
 *
 * Filter kernels for various quality levels.
 */

#define UP_KERNEL 32	/* kernel oversampling factor */

/*
 * taps = 8
 * pass = 16000/22050
 * stop = 28000/22050
 * ripple = +-1.0dB
 * atten = 70dB
 */
const int kernel8[4 * UP_KERNEL] = {
	 1879001565,  1873911610,  1863757951,  1848592626, 
	 1828493272,  1803563119,  1773929172,  1739742665, 
	 1701177272,  1658428204,  1611710937,  1561259879, 
	 1507326728,  1450178685,  1390097295,  1327376110, 
	 1262318932,  1195238366,  1126453310,  1056287140, 
	  985066239,   913117020,   840764786,   768331715, 
	  696134487,   624482915,   553678222,   484011125, 
	  415760011,   349190588,   284552798,   222081217, 
	  161992672,   104486554,    49742635,    -2078684, 
	  -50836893,   -96412767,  -138707146,  -177642308, 
	 -213161574,  -245228450,  -273827336,  -298962664, 
	 -320657725,  -338955053,  -353915061,  -365614579, 
	 -374146791,  -379619894,  -382155571,  -381887710, 
	 -378962295,  -373534303,  -365768349,  -355834891, 
	 -343911943,  -330179940,  -314824090,  -298030540, 
	 -279985510,  -260875771,  -240884502,  -220192787, 
	 -198977699,  -177409855,  -155654178,  -133869120, 
	 -112204293,   -90800790,   -69791174,   -49297858, 
	  -29433136,   -10299103,     8012593,    25421913, 
	   41858596,    57264240,    71589328,    84798253, 
	   96861104,   107762994,   117493566,   126054838, 
	  133457671,   139717252,   144859836,   148917603, 
	  151927671,   153934093,   154986307,   155136297, 
	  154440221,   152958026,   150750970,   147881235, 
	  144412609,   140410354,   135938742,   131061529, 
	  125840255,   120337708,   114609632,   108718628, 
	  102707014,    96639539,    90552789,    84494105, 
	   78509926,    72630046,    66888103,    61316996, 
	   55942557,    50783013,    45857706,    41183457, 
	   36772926,    32632154,    28765514,    25175294, 
	   21862888,    18825357,    16057571,    13551601, 
	   11299183,     9289876,     7512705,    15368497, 
};

/*
 * taps = 16
 * pass = 17250/22050
 * stop = 24750/22050
 * ripple = +-0.5dB
 * atten = 85dB
 */
const int kernel16[8 * UP_KERNEL] = {
	 1772753427,  1768295635,  1759400840,  1746110473, 
	 1728486420,  1706610620,  1680584635,  1650529060, 
	 1616582839,  1578902491,  1537661198,  1493047871, 
	 1445266049,  1394532773,  1341077375,  1285140196, 
	 1226971242,  1166828824,  1104978100,  1041689674, 
	  977238050,   911900221,   845954105,   779677112, 
	  713344646,   647228645,   581596204,   516708156, 
	  452817767,   390169466,   328997619,   269525423, 
	  211963791,   156510441,   103348943,    52647959, 
	    4560521,   -40776553,   -83243188,  -122736402, 
	 -159170661,  -192477983,  -222608098,  -249528345, 
	 -273223609,  -293696024,  -310964677,  -325065190, 
	 -336049146,  -343983537,  -348950042,  -351044268, 
	 -350374922,  -347062876,  -341240265,  -333049402, 
	 -322641783,  -310176960,  -295821428,  -279747485, 
	 -262132075,  -243155602,  -223000815,  -201851599, 
	 -179891878,  -157304477,  -134270061,  -110966061, 
	  -87565668,   -64236926,   -41141737,   -18435109, 
	    3735704,    25231872,    45923652,    65690988, 
	   84423956,   102023247,   118400464,   133478412, 
	  147191291,   159484772,   170316062,   179653858, 
	  187478194,   193780283,   198562251,   201836795, 
	  203626807,   203964915,   202893026,   200461680, 
	  196729596,   191762895,   185634560,   178423651, 
	  170214623,   161096601,   151162585,   140508748, 
	  129233630,   117437402,   105221155,    92686086, 
	   79932864,    67060915,    54167742,    41348293, 
	   28694405,    16294185,     4231539,    -7414351, 
	  -18569381,   -29165025,   -39138519,   -48433311, 
	  -56999141,   -64792317,   -71775832,   -77919390, 
	  -83199522,   -87599463,   -91109187,   -93725246, 
	  -95450571,   -96294389,   -96271898,   -95404001, 
	  -93717050,   -91242487,   -88016457,   -84079476, 
	  -79475972,   -74253916,   -68464337,   -62160947, 
	  -55399586,   -48237901,   -40734789,   -32949959, 
	  -24943587,   -16775725,    -8506091,     -193412, 
	    8104698,    16332272,    24435320,    32362065, 
	   40063289,    47492652,    54606815,    61365761, 
	   67732897,    73675233,    79163497,    84172241, 
	   88679846,    92668611,    96124754,    99038359, 
	  101403283,   103217261,   104481509,   105200961, 
	  105383674,   105041214,   104187935,   102841137, 
	  101020750,    98749077,    96050579,    92951742, 
	   89480614,    85666826,    81541121,    77135223, 
	   72481528,    67613007,    62562707,    57363773, 
	   52049071,    46651111,    41201580,    35731605, 
	   30271028,    24848880,    19492433,    14228017, 
	    9080032,     4071379,     -776760,    -5445141, 
	   -9916311,   -14174663,   -18206732,   -22000736, 
	  -25546943,   -28837522,   -31866591,   -34629889, 
	  -37125205,   -39351894,   -41311079,   -43005222, 
	  -44438601,   -45616478,   -46545792,   -47234101, 
	  -47690732,   -47925245,   -47948518,   -47772059, 
	  -47407643,   -46868216,   -46166458,   -45315498, 
	  -44328902,   -43219981,   -42002029,   -40688423, 
	  -39292376,   -37826515,   -36303369,   -34734966, 
	  -33132996,   -31508261,   -29871435,   -28232146, 
	  -26599910,   -24982768,   -23389134,   -21825774, 
	  -20299220,   -18815980,   -17379148,   -15995464, 
	  -14667014,   -13397047,   -12188347,   -11042978, 
	   -9961352,    -8944601,    -7992966,    -7106237, 
	   -6283110,    -5522755,    -4823830,    -4184893, 
	   -3603447,    -3077086,    -2603099,    -2179230, 
	   -1802723,    -1470865,    -1180331,    -2334686, 
};

/*
 * taps = 24
 * pass = 18250/22050
 * stop = 24150/22050
 * ripple = +-0.25dB
 * atten = 90dB
 */
const int kernel24[12 * UP_KERNEL] = {
	 1903680272,  1898539655,  1888283738,  1872962998, 
	 1852652784,  1827452860,  1797486816,  1762901335, 
	 1723865332,  1680568939,  1633222403,  1582054830, 
	 1527312850,  1469259165,  1408171014,  1344338557, 
	 1278063188,  1209655792,  1139434949,  1067725109, 
	  994854739,   921154453,   846955153,   772586168, 
	  698373422,   624637645,   551692607,   479843427, 
	  409384950,   340600182,   273758831,   209115927, 
	  146910558,    87364704,    30682197,   -22952212, 
	  -73373633,  -120437716,  -164021176,  -204022192, 
	 -240360662,  -272978325,  -301838750,  -326927179, 
	 -348250247,  -365835569,  -379731200,  -390004978, 
	 -396743753,  -400052494,  -400053326,  -396884436, 
	 -390698919,  -381663542,  -369957432,  -355770720, 
	 -339303126,  -320762510,  -300363391,  -278325465, 
	 -254872080,  -230228762,  -204621705,  -178276322, 
	 -151415804,  -124259728,   -97022720,   -69913162, 
	  -43131988,   -16871521,     8685582,    33367305, 
	   57013175,    79475048,   100617797,   120319921, 
	  138474010,   154987145,   169781162,   182792816, 
	  193973847,   203290933,   210725543,   216273684, 
	  219945567,   221765158,   221769674,   220008953, 
	  216544795,   211450197,   204808549,   196712751, 
	  187264299,   176572329,   164752615,   151926545, 
	  138220095,   123762762,   108686526,    93124803, 
	   77211396,    61079502,    44860710,    28684057, 
	   12675108,    -3044906,   -18359906,   -33159721, 
	  -47340793,   -60806805,   -73469243,   -85247906, 
	  -96071306,  -105877035,  -114612016,  -122232717, 
	 -128705249,  -134005422,  -138118708,  -141040130, 
	 -142774093,  -143334146,  -142742657,  -141030458, 
	 -138236423,  -134406974,  -129595573,  -123862141, 
	 -117272462,  -109897540,  -101812937,   -93098079, 
	  -83835576,   -74110492,   -64009638,   -53620864,