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Add DSP interpolation code.

This commit is contained in:
Brandon Wright 2018-08-05 17:04:06 -05:00
parent a1b9a89718
commit f60abd9e94
3 changed files with 394 additions and 15 deletions
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8
apu/apu.cpp
View File

@ -914,3 +914,11 @@ bool8 S9xSPCDump (const char *filename)
return (TRUE);
}
extern int dsp_interpolation_method;
void S9xSetDSPInterpolation (int mode)
{
dsp_interpolation_method = mode;
return;
}

8
apu/apu.h
View File

@ -231,4 +231,12 @@ bool8 S9xMixSamples (uint8 *, int);
void S9xSetSamplesAvailableCallback (apu_callback, void *);
void S9xUpdateDynamicRate (int, int);
#define DSP_INTERPOLATION_NONE 0
#define DSP_INTERPOLATION_LINEAR 1
#define DSP_INTERPOLATION_GAUSSIAN 2
#define DSP_INTERPOLATION_CUBIC 3
#define DSP_INTERPOLATION_SINC 4
void S9xSetDSPInterpolation (int);
#endif

393
apu/bapu/dsp/SPC_DSP.cpp
View File

@ -113,27 +113,390 @@ static short const gauss [512] =
1299,1300,1300,1301,1302,1302,1303,1303,1303,1304,1304,1304,1304,1304,1305,1305,
};
// Interpolation by Mudlord
static short const cubic [514] =
{
0, -4, -8, -12, -16, -20, -23, -27, -30, -34, -37, -41, -44, -47, -50, -53,
-56, -59, -62, -65, -68, -71, -73, -76, -78, -81, -84, -87, -89, -91, -93, -95,
-98,-100,-102,-104,-106,-109,-110,-112,-113,-116,-117,-119,-121,-122,-123,-125,
-126,-128,-129,-131,-132,-134,-134,-136,-136,-138,-138,-140,-141,-141,-142,-143,
-144,-144,-145,-146,-147,-148,-147,-148,-148,-149,-149,-150,-150,-150,-150,-151,
-151,-151,-151,-151,-152,-152,-151,-152,-151,-152,-151,-151,-151,-151,-150,-150,
-150,-149,-149,-149,-149,-148,-147,-147,-146,-146,-145,-145,-144,-144,-143,-142,
-141,-141,-140,-139,-139,-138,-137,-136,-135,-135,-133,-133,-132,-131,-130,-129,
-128,-127,-126,-125,-124,-123,-121,-121,-119,-118,-117,-116,-115,-114,-112,-111,
-110,-109,-107,-106,-105,-104,-102,-102,-100, -99, -97, -97, -95, -94, -92, -91,
-90, -88, -87, -86, -85, -84, -82, -81, -79, -78, -76, -76, -74, -73, -71, -70,
-68, -67, -66, -65, -63, -62, -60, -60, -58, -57, -55, -55, -53, -52, -50, -49,
-48, -46, -45, -44, -43, -42, -40, -39, -38, -37, -36, -35, -34, -32, -31, -30,
-29, -28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -19, -17, -16, -15, -14,
-14, -13, -12, -11, -11, -10, -9, -9, -8, -8, -7, -7, -6, -5, -4, -4,
-3, -3, -3, -2, -2, -2, -1, -1, 0, -1, 0, -1, 0, 0, 0, 0,
0,
2048,2048,2048,2048,2047,2047,2046,2045,2043,2042,2041,2039,2037,2035,2033,2031,
2028,2026,2024,2021,2018,2015,2012,2009,2005,2002,1999,1995,1991,1987,1982,1978,
1974,1969,1965,1960,1955,1951,1946,1940,1934,1929,1924,1918,1912,1906,1900,1895,
1888,1882,1875,1869,1862,1856,1849,1842,1835,1828,1821,1814,1806,1799,1791,1783,
1776,1768,1760,1753,1744,1737,1728,1720,1711,1703,1695,1686,1677,1668,1659,1651,
1641,1633,1623,1614,1605,1596,1587,1577,1567,1559,1549,1539,1529,1520,1510,1499,
1490,1480,1470,1460,1450,1440,1430,1420,1408,1398,1389,1378,1367,1357,1346,1336,
1325,1315,1304,1293,1282,1272,1261,1250,1239,1229,1218,1207,1196,1185,1174,1163,
1152,1141,1130,1119,1108,1097,1086,1075,1063,1052,1042,1030,1019,1008, 997, 986,
974, 964, 952, 941, 930, 919, 908, 897, 886, 875, 864, 853, 842, 831, 820, 809,
798, 787, 776, 765, 754, 744, 733, 722, 711, 700, 690, 679, 668, 658, 647, 637,
626, 616, 605, 595, 584, 574, 564, 554, 543, 534, 524, 514, 503, 494, 483, 473,
464, 454, 444, 435, 425, 416, 407, 397, 387, 378, 370, 360, 351, 342, 333, 325,
315, 307, 298, 290, 281, 273, 265, 256, 248, 241, 233, 225, 216, 209, 201, 193,
186, 178, 171, 164, 157, 150, 143, 137, 129, 123, 117, 110, 103, 97, 91, 85,
79, 74, 68, 62, 56, 51, 46, 41, 35, 31, 27, 22, 17, 13, 8, 4,
0
};
static short const sinc [2048] =
{
39, -315, 666, 15642, 666, -315, 39, -38,
38, -302, 613, 15642, 718, -328, 41, -38,
36, -288, 561, 15641, 772, -342, 42, -38,
35, -275, 510, 15639, 826, -355, 44, -38,
33, -263, 459, 15636, 880, -369, 46, -38,
32, -250, 408, 15632, 935, -383, 47, -38,
31, -237, 358, 15628, 990, -396, 49, -38,
29, -224, 309, 15622, 1046, -410, 51, -38,
28, -212, 259, 15616, 1103, -425, 53, -38,
27, -200, 211, 15609, 1159, -439, 54, -38,
25, -188, 163, 15601, 1216, -453, 56, -38,
24, -175, 115, 15593, 1274, -467, 58, -38,
23, -164, 68, 15583, 1332, -482, 60, -38,
22, -152, 22, 15573, 1391, -496, 62, -37,
21, -140, -24, 15562, 1450, -511, 64, -37,
19, -128, -70, 15550, 1509, -526, 66, -37,
18, -117, -115, 15538, 1569, -540, 68, -37,
17, -106, -159, 15524, 1629, -555, 70, -37,
16, -94, -203, 15510, 1690, -570, 72, -36,
15, -83, -247, 15495, 1751, -585, 74, -36,
14, -72, -289, 15479, 1813, -600, 76, -36,
13, -62, -332, 15462, 1875, -616, 79, -36,
12, -51, -374, 15445, 1937, -631, 81, -35,
11, -40, -415, 15426, 2000, -646, 83, -35,
11, -30, -456, 15407, 2063, -662, 85, -35,
10, -20, -496, 15387, 2127, -677, 88, -34,
9, -9, -536, 15366, 2191, -693, 90, -34,
8, 1, -576, 15345, 2256, -708, 92, -34,
7, 10, -614, 15323, 2321, -724, 95, -33,
7, 20, -653, 15300, 2386, -740, 97, -33,
6, 30, -690, 15276, 2451, -755, 99, -33,
5, 39, -728, 15251, 2517, -771, 102, -32,
5, 49, -764, 15226, 2584, -787, 104, -32,
4, 58, -801, 15200, 2651, -803, 107, -32,
3, 67, -836, 15173, 2718, -819, 109, -31,
3, 76, -871, 15145, 2785, -835, 112, -31,
2, 85, -906, 15117, 2853, -851, 115, -30,
2, 93, -940, 15087, 2921, -867, 117, -30,
1, 102, -974, 15057, 2990, -883, 120, -29,
1, 110, -1007, 15027, 3059, -899, 122, -29,
0, 118, -1039, 14995, 3128, -915, 125, -29,
0, 127, -1071, 14963, 3198, -931, 128, -28,
-1, 135, -1103, 14930, 3268, -948, 131, -28,
-1, 142, -1134, 14896, 3338, -964, 133, -27,
-1, 150, -1164, 14862, 3409, -980, 136, -27,
-2, 158, -1194, 14827, 3480, -996, 139, -26,
-2, 165, -1224, 14791, 3551, -1013, 142, -26,
-3, 172, -1253, 14754, 3622, -1029, 144, -25,
-3, 179, -1281, 14717, 3694, -1045, 147, -25,
-3, 187, -1309, 14679, 3766, -1062, 150, -24,
-3, 193, -1337, 14640, 3839, -1078, 153, -24,
-4, 200, -1363, 14601, 3912, -1094, 156, -23,
-4, 207, -1390, 14561, 3985, -1110, 159, -23,
-4, 213, -1416, 14520, 4058, -1127, 162, -22,
-4, 220, -1441, 14479, 4131, -1143, 165, -22,
-4, 226, -1466, 14437, 4205, -1159, 168, -22,
-5, 232, -1490, 14394, 4279, -1175, 171, -21,
-5, 238, -1514, 14350, 4354, -1192, 174, -21,
-5, 244, -1537, 14306, 4428, -1208, 177, -20,
-5, 249, -1560, 14261, 4503, -1224, 180, -20,
-5, 255, -1583, 14216, 4578, -1240, 183, -19,
-5, 260, -1604, 14169, 4653, -1256, 186, -19,
-5, 265, -1626, 14123, 4729, -1272, 189, -18,
-5, 271, -1647, 14075, 4805, -1288, 192, -18,
-5, 276, -1667, 14027, 4881, -1304, 195, -17,
-6, 280, -1687, 13978, 4957, -1320, 198, -17,
-6, 285, -1706, 13929, 5033, -1336, 201, -16,
-6, 290, -1725, 13879, 5110, -1352, 204, -16,
-6, 294, -1744, 13829, 5186, -1368, 207, -15,
-6, 299, -1762, 13777, 5263, -1383, 210, -15,
-6, 303, -1779, 13726, 5340, -1399, 213, -14,
-6, 307, -1796, 13673, 5418, -1414, 216, -14,
-6, 311, -1813, 13620, 5495, -1430, 219, -13,
-5, 315, -1829, 13567, 5573, -1445, 222, -13,
-5, 319, -1844, 13512, 5651, -1461, 225, -13,
-5, 322, -1859, 13458, 5728, -1476, 229, -12,
-5, 326, -1874, 13402, 5806, -1491, 232, -12,
-5, 329, -1888, 13347, 5885, -1506, 235, -11,
-5, 332, -1902, 13290, 5963, -1521, 238, -11,
-5, 335, -1915, 13233, 6041, -1536, 241, -10,
-5, 338, -1928, 13176, 6120, -1551, 244, -10,
-5, 341, -1940, 13118, 6199, -1566, 247, -10,
-5, 344, -1952, 13059, 6277, -1580, 250, -9,
-5, 347, -1964, 13000, 6356, -1595, 253, -9,
-5, 349, -1975, 12940, 6435, -1609, 256, -8,
-4, 352, -1986, 12880, 6514, -1623, 259, -8,
-4, 354, -1996, 12819, 6594, -1637, 262, -8,
-4, 356, -2005, 12758, 6673, -1651, 265, -7,
-4, 358, -2015, 12696, 6752, -1665, 268, -7,
-4, 360, -2024, 12634, 6831, -1679, 271, -7,
-4, 362, -2032, 12572, 6911, -1693, 274, -6,
-4, 364, -2040, 12509, 6990, -1706, 277, -6,
-4, 366, -2048, 12445, 7070, -1719, 280, -6,
-3, 367, -2055, 12381, 7149, -1732, 283, -5,
-3, 369, -2062, 12316, 7229, -1745, 286, -5,
-3, 370, -2068, 12251, 7308, -1758, 289, -5,
-3, 371, -2074, 12186, 7388, -1771, 291, -4,
-3, 372, -2079, 12120, 7467, -1784, 294, -4,
-3, 373, -2084, 12054, 7547, -1796, 297, -4,
-3, 374, -2089, 11987, 7626, -1808, 300, -4,
-2, 375, -2094, 11920, 7706, -1820, 303, -3,
-2, 376, -2098, 11852, 7785, -1832, 305, -3,
-2, 376, -2101, 11785, 7865, -1844, 308, -3,
-2, 377, -2104, 11716, 7944, -1855, 311, -3,
-2, 377, -2107, 11647, 8024, -1866, 313, -2,
-2, 378, -2110, 11578, 8103, -1877, 316, -2,
-2, 378, -2112, 11509, 8182, -1888, 318, -2,
-1, 378, -2113, 11439, 8262, -1899, 321, -2,
-1, 378, -2115, 11369, 8341, -1909, 323, -2,
-1, 378, -2116, 11298, 8420, -1920, 326, -2,
-1, 378, -2116, 11227, 8499, -1930, 328, -1,
-1, 378, -2116, 11156, 8578, -1940, 331, -1,
-1, 378, -2116, 11084, 8656, -1949, 333, -1,
-1, 377, -2116, 11012, 8735, -1959, 335, -1,
-1, 377, -2115, 10940, 8814, -1968, 337, -1,
-1, 377, -2114, 10867, 8892, -1977, 340, -1,
-1, 376, -2112, 10795, 8971, -1985, 342, -1,
0, 375, -2111, 10721, 9049, -1994, 344, -1,
0, 375, -2108, 10648, 9127, -2002, 346, 0,
0, 374, -2106, 10574, 9205, -2010, 348, 0,
0, 373, -2103, 10500, 9283, -2018, 350, 0,
0, 372, -2100, 10426, 9360, -2025, 352, 0,
0, 371, -2097, 10351, 9438, -2032, 354, 0,
0, 370, -2093, 10276, 9515, -2039, 355, 0,
0, 369, -2089, 10201, 9592, -2046, 357, 0,
0, 367, -2084, 10126, 9669, -2052, 359, 0,
0, 366, -2080, 10050, 9745, -2058, 360, 0,
0, 365, -2075, 9974, 9822, -2064, 362, 0,
0, 363, -2070, 9898, 9898, -2070, 363, 0,
0, 362, -2064, 9822, 9974, -2075, 365, 0,
0, 360, -2058, 9745, 10050, -2080, 366, 0,
0, 359, -2052, 9669, 10126, -2084, 367, 0,
0, 357, -2046, 9592, 10201, -2089, 369, 0,
0, 355, -2039, 9515, 10276, -2093, 370, 0,
0, 354, -2032, 9438, 10351, -2097, 371, 0,
0, 352, -2025, 9360, 10426, -2100, 372, 0,
0, 350, -2018, 9283, 10500, -2103, 373, 0,
0, 348, -2010, 9205, 10574, -2106, 374, 0,
0, 346, -2002, 9127, 10648, -2108, 375, 0,
-1, 344, -1994, 9049, 10721, -2111, 375, 0,
-1, 342, -1985, 8971, 10795, -2112, 376, -1,
-1, 340, -1977, 8892, 10867, -2114, 377, -1,
-1, 337, -1968, 8814, 10940, -2115, 377, -1,
-1, 335, -1959, 8735, 11012, -2116, 377, -1,
-1, 333, -1949, 8656, 11084, -2116, 378, -1,
-1, 331, -1940, 8578, 11156, -2116, 378, -1,
-1, 328, -1930, 8499, 11227, -2116, 378, -1,
-2, 326, -1920, 8420, 11298, -2116, 378, -1,
-2, 323, -1909, 8341, 11369, -2115, 378, -1,
-2, 321, -1899, 8262, 11439, -2113, 378, -1,
-2, 318, -1888, 8182, 11509, -2112, 378, -2,
-2, 316, -1877, 8103, 11578, -2110, 378, -2,
-2, 313, -1866, 8024, 11647, -2107, 377, -2,
-3, 311, -1855, 7944, 11716, -2104, 377, -2,
-3, 308, -1844, 7865, 11785, -2101, 376, -2,
-3, 305, -1832, 7785, 11852, -2098, 376, -2,
-3, 303, -1820, 7706, 11920, -2094, 375, -2,
-4, 300, -1808, 7626, 11987, -2089, 374, -3,
-4, 297, -1796, 7547, 12054, -2084, 373, -3,
-4, 294, -1784, 7467, 12120, -2079, 372, -3,
-4, 291, -1771, 7388, 12186, -2074, 371, -3,
-5, 289, -1758, 7308, 12251, -2068, 370, -3,
-5, 286, -1745, 7229, 12316, -2062, 369, -3,
-5, 283, -1732, 7149, 12381, -2055, 367, -3,
-6, 280, -1719, 7070, 12445, -2048, 366, -4,
-6, 277, -1706, 6990, 12509, -2040, 364, -4,
-6, 274, -1693, 6911, 12572, -2032, 362, -4,
-7, 271, -1679, 6831, 12634, -2024, 360, -4,
-7, 268, -1665, 6752, 12696, -2015, 358, -4,
-7, 265, -1651, 6673, 12758, -2005, 356, -4,
-8, 262, -1637, 6594, 12819, -1996, 354, -4,
-8, 259, -1623, 6514, 12880, -1986, 352, -4,
-8, 256, -1609, 6435, 12940, -1975, 349, -5,
-9, 253, -1595, 6356, 13000, -1964, 347, -5,
-9, 250, -1580, 6277, 13059, -1952, 344, -5,
-10, 247, -1566, 6199, 13118, -1940, 341, -5,
-10, 244, -1551, 6120, 13176, -1928, 338, -5,
-10, 241, -1536, 6041, 13233, -1915, 335, -5,
-11, 238, -1521, 5963, 13290, -1902, 332, -5,
-11, 235, -1506, 5885, 13347, -1888, 329, -5,
-12, 232, -1491, 5806, 13402, -1874, 326, -5,
-12, 229, -1476, 5728, 13458, -1859, 322, -5,
-13, 225, -1461, 5651, 13512, -1844, 319, -5,
-13, 222, -1445, 5573, 13567, -1829, 315, -5,
-13, 219, -1430, 5495, 13620, -1813, 311, -6,
-14, 216, -1414, 5418, 13673, -1796, 307, -6,
-14, 213, -1399, 5340, 13726, -1779, 303, -6,
-15, 210, -1383, 5263, 13777, -1762, 299, -6,
-15, 207, -1368, 5186, 13829, -1744, 294, -6,
-16, 204, -1352, 5110, 13879, -1725, 290, -6,
-16, 201, -1336, 5033, 13929, -1706, 285, -6,
-17, 198, -1320, 4957, 13978, -1687, 280, -6,
-17, 195, -1304, 4881, 14027, -1667, 276, -5,
-18, 192, -1288, 4805, 14075, -1647, 271, -5,
-18, 189, -1272, 4729, 14123, -1626, 265, -5,
-19, 186, -1256, 4653, 14169, -1604, 260, -5,
-19, 183, -1240, 4578, 14216, -1583, 255, -5,
-20, 180, -1224, 4503, 14261, -1560, 249, -5,
-20, 177, -1208, 4428, 14306, -1537, 244, -5,
-21, 174, -1192, 4354, 14350, -1514, 238, -5,
-21, 171, -1175, 4279, 14394, -1490, 232, -5,
-22, 168, -1159, 4205, 14437, -1466, 226, -4,
-22, 165, -1143, 4131, 14479, -1441, 220, -4,
-22, 162, -1127, 4058, 14520, -1416, 213, -4,
-23, 159, -1110, 3985, 14561, -1390, 207, -4,
-23, 156, -1094, 3912, 14601, -1363, 200, -4,
-24, 153, -1078, 3839, 14640, -1337, 193, -3,
-24, 150, -1062, 3766, 14679, -1309, 187, -3,
-25, 147, -1045, 3694, 14717, -1281, 179, -3,
-25, 144, -1029, 3622, 14754, -1253, 172, -3,
-26, 142, -1013, 3551, 14791, -1224, 165, -2,
-26, 139, -996, 3480, 14827, -1194, 158, -2,
-27, 136, -980, 3409, 14862, -1164, 150, -1,
-27, 133, -964, 3338, 14896, -1134, 142, -1,
-28, 131, -948, 3268, 14930, -1103, 135, -1,
-28, 128, -931, 3198, 14963, -1071, 127, 0,
-29, 125, -915, 3128, 14995, -1039, 118, 0,
-29, 122, -899, 3059, 15027, -1007, 110, 1,
-29, 120, -883, 2990, 15057, -974, 102, 1,
-30, 117, -867, 2921, 15087, -940, 93, 2,
-30, 115, -851, 2853, 15117, -906, 85, 2,
-31, 112, -835, 2785, 15145, -871, 76, 3,
-31, 109, -819, 2718, 15173, -836, 67, 3,
-32, 107, -803, 2651, 15200, -801, 58, 4,
-32, 104, -787, 2584, 15226, -764, 49, 5,
-32, 102, -771, 2517, 15251, -728, 39, 5,
-33, 99, -755, 2451, 15276, -690, 30, 6,
-33, 97, -740, 2386, 15300, -653, 20, 7,
-33, 95, -724, 2321, 15323, -614, 10, 7,
-34, 92, -708, 2256, 15345, -576, 1, 8,
-34, 90, -693, 2191, 15366, -536, -9, 9,
-34, 88, -677, 2127, 15387, -496, -20, 10,
-35, 85, -662, 2063, 15407, -456, -30, 11,
-35, 83, -646, 2000, 15426, -415, -40, 11,
-35, 81, -631, 1937, 15445, -374, -51, 12,
-36, 79, -616, 1875, 15462, -332, -62, 13,
-36, 76, -600, 1813, 15479, -289, -72, 14,
-36, 74, -585, 1751, 15495, -247, -83, 15,
-36, 72, -570, 1690, 15510, -203, -94, 16,
-37, 70, -555, 1629, 15524, -159, -106, 17,
-37, 68, -540, 1569, 15538, -115, -117, 18,
-37, 66, -526, 1509, 15550, -70, -128, 19,
-37, 64, -511, 1450, 15562, -24, -140, 21,
-37, 62, -496, 1391, 15573, 22, -152, 22,
-38, 60, -482, 1332, 15583, 68, -164, 23,
-38, 58, -467, 1274, 15593, 115, -175, 24,
-38, 56, -453, 1216, 15601, 163, -188, 25,
-38, 54, -439, 1159, 15609, 211, -200, 27,
-38, 53, -425, 1103, 15616, 259, -212, 28,
-38, 51, -410, 1046, 15622, 309, -224, 29,
-38, 49, -396, 990, 15628, 358, -237, 31,
-38, 47, -383, 935, 15632, 408, -250, 32,
-38, 46, -369, 880, 15636, 459, -263, 33,
-38, 44, -355, 826, 15639, 510, -275, 35,
-38, 42, -342, 772, 15641, 561, -288, 36,
-38, 41, -328, 718, 15642, 613, -302, 38,
};
int dsp_interpolation_method = 2;
inline int SPC_DSP::interpolate( voice_t const* v )
{
// Make pointers into gaussian based on fractional position between samples
int offset = v->interp_pos >> 4 & 0xFF;
short const* fwd = gauss + 255 - offset;
short const* rev = gauss + offset; // mirror left half of gaussian
int out;
int const* in = &v->buf [(v->interp_pos >> 12) + v->buf_pos];
int const* in = &v->buf [(v->interp_pos >> 12) + v->buf_pos];
int out;
out = (fwd [ 0] * in [0]) >> 11;
out += (fwd [256] * in [1]) >> 11;
out += (rev [256] * in [2]) >> 11;
out = (int16_t) out;
out += (rev [ 0] * in [3]) >> 11;
switch (dsp_interpolation_method)
{
case 0: // raw
{
out = v->buf [(v->interp_pos >> 12) + v->buf_pos] & ~1;
break;
}
CLAMP16( out );
out &= ~1;
return out;
case 1: // linear interpolation
{
int fract = v->interp_pos & 0xFFF;
out = (0x1000 - fract) * in [0];
out += fract * in [1];
out >>= 12;
break;
}
case 3: // cubic filter
{
// Make pointers into cubic based on fractional position between samples
int offset = v->interp_pos >> 4 & 0xFF;
short const* fwd = cubic + offset;
short const* rev = cubic + 256 - offset; // mirror left half of cubic
int const* in = &v->buf [(v->interp_pos >> 12) + v->buf_pos];
out = fwd [ 0] * in [0];
out += fwd [257] * in [1];
out += rev [257] * in [2];
out += rev [ 0] * in [3];
out >>= 11;
break;
}
case 4: // sinc filter
{
// Make pointers into cubic based on fractional position between samples
int offset = (v->interp_pos & 0xFF0) >> 1;
short const* filt = sinc + offset;
int const* in = &v->buf [(v->interp_pos >> 12) + v->buf_pos];
out = filt [0] * in [0];
out += filt [1] * in [1];
out += filt [2] * in [2];
out += filt [3] * in [3];
out += filt [4] * in [4];
out += filt [5] * in [5];
out += filt [6] * in [6];
out += filt [7] * in [7];
out >>= 14;
break;
}
default:
case 2: // Original gaussian filter
{
// Make pointers into gaussian based on fractional position between samples
int offset = v->interp_pos >> 4 & 0xFF;
short const* fwd = gauss + 255 - offset;
short const* rev = gauss + offset; // mirror left half of gaussian
int const* in = &v->buf [(v->interp_pos >> 12) + v->buf_pos];
out = (fwd [ 0] * in [0]) >> 11;
out += (fwd [256] * in [1]) >> 11;
out += (rev [256] * in [2]) >> 11;
out = (int16_t) out;
out += (rev [ 0] * in [3]) >> 11;
CLAMP16( out );
out &= ~1;
break;
}
}
return out;
}
//// Counters
int const simple_counter_range = 2048 * 5 * 3; // 30720