blip_buf 0.2.0

extern crate blip_buf;

use blip_buf::BlipBuf;

const CLOCK_RATE: f64 = 1000000.0;
const SAMPLE_RATE: u32 = 4800;

struct Lfsr13 {
    state: u32,
}

impl Lfsr13 {
    fn new() -> Self {
        Lfsr13 {
            state: (1 << 12) | 1,
        }
    }

    fn next(&mut self) -> u32 {
        let lfsr = self.state;
        let bit = (lfsr ^ (lfsr >> 1) ^ (lfsr >> 2) ^ (lfsr >> 5)) & 1;
        self.state = (lfsr >> 1) | (bit << 12);
        return self.state;
    }
}

#[test]
fn lfsr() {
    let mut blip = BlipBuf::new(SAMPLE_RATE / 10);
    blip.set_rates(CLOCK_RATE, SAMPLE_RATE as f64).unwrap();

    let period = 20;
    let mut time = 0;

    let mut lfsr = Lfsr13::new();
    let mut oldval = lfsr.next();

    for n in 0..60 {
        let clocks = CLOCK_RATE as i32 / 60;
        while time < clocks {
            let newval = lfsr.next();
            let delta = (newval as i32) - (oldval as i32);
            blip.add_delta(time as u32, delta).unwrap();
            oldval = newval;

            time = time + period;
        }

        // Add those clocks to buffer and adjust time for next frame
        time = time - clocks;
        blip.end_frame(clocks as u32).unwrap();

        // Read any output samples now available
        while blip.samples_avail() > 0 {
            let temp = &mut [0i16; 1024];
            let count = blip.read_samples(temp, false);
            let target_count = if n == 0 { 79 } else { 80 };
            assert_eq!(&temp[..count], &RESULTS[n][..target_count]);
        }
    }
}

const RESULTS: [[i16; 80]; 60] = [
    [
        0, -5, 9, -40, 49, -160, 122, -909, -2788, -2819, -2968, -1558, -2579, -2794, -1487, -843,
        -1301, -1618, -1810, -1729, -2141, -3004, -2200, -1951, -1104, -786, -2043, -2319, -2467,
        -2809, -2047, -1823, -2516, -2764, -2553, -852, -2144, -3070, -2024, -2001, -2120, 523,
        -2183, -3377, -545, -1252, -2291, -2598, -1261, -2284, -2007, -1900, -2649, -1998, -883,
        -837, -2558, -2489, -1455, -938, -942, -2079, -1099, -3020, -2459, -779, -998, -986, -1070,
        -1865, -2384, -1353, -2040, -1334, -1745, -2446, -1052, -1553, -1274, 0,
    ],
    [
        -448, -1340, -1002, -1240, -2787, -2806, -2994, -2326, -3977, -3259, -2517, -1613, -840,
        -2052, -2535, -3101, -2143, -1521, -1079, -2295, -1882, -1166, -384, -440, -1157, -1817,
        -3407, -2390, -1664, -480, -2028, -1050, 109, -2134, -2172, -1697, -1161, -835, -908,
        -1613, -1472, -1539, -2593, -2127, -2011, -878, -464, -1227, -2982, -2395, -1027, -2143,
        -1132, 353, -515, -1519, -1757, -1353, -446, 265, -906, -2203, -1922, -2, -1441, -1990,
        -2468, -3055, -2245, -744, 964, -682, -1912, -3146, -3221, -1536, -2786, -2880, -1285,
        -1737,
    ],
    [
        -2825, -1461, -452, -1155, 447, -1501, -566, -1284, -1366, -70, -2539, -797, -1376, -2610,
        -2315, -675, 313, -210, -1887, -2220, -2275, -1252, -2312, -1956, -1476, -2706, -915,
        -1422, -1877, -1795, -1449, -1053, -1625, -2317, -3458, -2603, -532, -1262, -2031, -451,
        -246, -2121, -2788, -1578, -428, -866, -686, -86, 863, -234, -1215, -1649, -2008, -1147,
        -795, -2089, -1901, -2952, -2694, 77, 523, -963, -1719, -2560, -3011, -1080, -908, -776,
        -545, -871, -1529, -2461, -2005, -2869, -2584, -782, -1650, -1353, -767, -261,
    ],
    [
        -430, -1523, -1113, -3292, -4280, -2548, -2392, -944, -2222, -2745, -1913, -1792, -2004,
        -1518, -1909, -2253, -1696, -1132, -1669, -1222, -1278, -1628, -1558, -1890, -514, -1592,
        -892, -2020, -1397, 608, -2358, -2676, -1705, -2119, -265, -988, -2565, -1628, -2300, -727,
        -211, -873, -229, -2857, -2426, -1426, -1872, -719, -654, -1552, -2176, -1332, -272, -2137,
        -2194, -2029, -1803, -615, -1896, 147, 764, -1091, -145, -966, -1136, -1214, -1079, -200,
        329, 98, -852, -391, -131, 500, -438, -1956, -1103, -1317, -21, 521,
    ],
    [
        -663, -1489, -1161, -2424, -2161, -473, -395, -658, -1481, -2291, -957, -333, -805, -1425,
        -238, 387, -1905, -584, -986, -1492, -978, -1630, 221, -956, -1235, 495, 391, -568, 752,
        758, -1392, -620, -1568, -1325, 668, -714, -2132, -2787, -2659, -1309, -16, 203, -303,
        -885, -518, -666, -1011, 299, -466, -1134, -1029, -1962, -1293, -1740, -1121, -105, -1539,
        -434, -192, -1587, -1901, -236, 411, 314, -1287, -1291, -458, -2196, -1314, 1487, -1438,
        -2182, 830, -515, -1901, -1840, -2137, -1441, -37, 591,
    ],
    [
        -950, -2519, -1167, -1474, -1822, -2209, -1979, -1105, -1529, -2349, -2609, -1197, -1619,
        -876, -1254, -2092, -204, -1863, -3062, -924, -672, -2747, -995, 202, -1554, -1233, -1871,
        -1497, 425, 118, 328, 363, -234, 1358, 940, -1115, 130, 186, -516, -103, -1765, -1387,
        -297, -1214, -1025, -296, 693, 285, -1871, -2213, 44, 1040, 833, 1116, -561, -1198, -130,
        -1036, -2771, -738, -35, -1265, -620, 179, -575, -2337, -1059, -485, -777, -597, 335, -65,
        -2161, -1591, -926, -818, -1756, -2248, 1420, 914,
    ],
    [
        -1767, -392, -780, -1416, -3079, -2849, -1213, -1170, -1079, -1594, -1415, -1379, -1910,
        610, 955, 576, 513, 14, 496, 605, -171, -568, 246, -1104, -773, 1117, 905, -122, -1699,
        -1391, -634, -1490, -1863, -430, 318, -511, -1068, -1464, -216, -656, -1901, -2358, -2050,
        -1683, -2000, -1476, -52, 527, 1090, 1496, -423, -625, 17, -1731, -1362, -937, -1306,
        -1294, -404, -1234, -1909, -1803, -904, 206, 71, -401, -271, 236, -828, -1489, 265, 538,
        452, 739, 323, 830, 1190, 1267, -981, -3295,
    ],
    [
        -1152, -568, -710, -501, -1799, 510, 1063, -1279, -1369, -1163, -1229, 8, 447, -291, -362,
        -362, -2694, -1625, 474, -419, -513, 216, -60, -269, -904, -161, -489, -866, -694, -1135,
        -506, 305, -999, -2243, -2292, -1679, -585, -334, -1654, -301, 348, -672, -704, -724, 366,
        -617, -1194, -205, -90, -719, -1066, -231, 266, -1210, -1137, -1185, -1858, -1665, -2078,
        -185, -96, -910, -184, -294, 12, -1371, -243, 296, -1466, -1381, -1573, -1859, -2536, -901,
        -439, -523, 312, -222, -732, -1887,
    ],
    [
        770, 1289, -378, 364, 765, 989, -445, -944, -77, -51, -585, -320, -1146, -1140, -723, -592,
        522, -73, -1094, -906, -735, -1181, -1752, -1703, -1464, 520, 387, 538, 297, -528, -489,
        -780, -819, -1975, -1613, -1746, -2517, -1761, -939, -656, 260, 90, 39, -341, -496, 167, 9,
        -547, -5, -872, -1072, -423, -2092, -1216, -671, -846, -1072, -631, -946, -877, -100,
        -2442, -1202, 508, -1968, -1397, -104, -1074, 82, -48, -425, -745, -822, 375, -649, -2407,
        -2125, -1683, -269, -2208,
    ],
    [
        -2644, 159, 315, 1115, 685, -2417, -950, -35, -824, 61, -464, 476, 544, -1400, -651, -92,
        -1255, -1209, -943, 279, -880, -491, -521, -551, 475, -1421, -1875, 619, -402, -2090, -495,
        109, -872, -1031, 352, -82, 155, -176, -1009, -1611, 323, -94, -1769, -1042, -769, -401,
        -210, -366, -1375, -2508, -1791, -870, 804, -364, -967, -150, 1007, 1396, -784, -531, -638,
        -1724, -561, -201, -1226, -1779, -44, 674, -1459, -1272, -85, -657, -541, -933, -2900,
        -2500, -1017, -1694, -289, -427,
    ],
    [
        -1460, -272, 631, 551, -12, -108, -254, -215, -1331, -928, -407, 66, 935, -73, -780, -779,
        -1219, -848, -132, -812, -1092, -1342, 270, 116, -1554, -881, -235, -949, 1336, 862, -2376,
        327, 690, -441, -1262, -82, -299, -877, -165, -1068, -821, 221, 898, -513, -1346, -208,
        289, 807, -481, 137, -726, -1752, 450, 499, 486, 392, -2, -1058, -147, -327, -326, 174,
        -1165, 16, 149, -173, 854, 439, 57, 618, -1088, -1358, -1696, -966, -1997, -2451, -1149,
        -784, 642, -340,
    ],
    [
        -962, -1691, -1144, -343, 280, -487, -923, 81, 601, 1205, 253, 18, -1795, -1477, -602, 610,
        -11, -594, 1636, -153, -1041, -516, -30, 408, 499, -58, -367, 24, -1090, -1019, -780, -43,
        864, 445, -1143, -1704, 114, -473, -549, 1429, 1153, 41, -542, -225, 386, 1522, 822, -542,
        -1145, 845, 513, -829, -853, -1854, -1294, -211, 1941, 1303, -442, -1400, -2376, -672,
        -937, -2040, -466, -156, -1396, -1016, 848, -26, 1292, 509, -122, 745, -899, 1399, -881,
        -311, 353, -1175,
    ],
    [
        -1445, -62, 1269, 1385, -266, -1010, -1210, -381, -596, -1333, -24, -1479, -370, 165, -772,
        -632, -525, 71, -258, -916, -1977, -2136, 127, 356, -921, 24, 1192, -406, -1653, -1056,
        534, 383, 304, 715, 1784, 1410, 54, -369, -900, -466, 450, -644, -946, -1332, -2179, 305,
        1791, 634, -521, -1071, -2122, -658, 316, 90, 567, 265, -126, -1252, -1117, -1363, -2059,
        -80, -224, -621, 170, 543, 899, -288, -178, -1202, -3526, -1908, -1526, -320, -507, -1906,
        -1095, -769, -946, -723,
    ],
    [
        -601, -1310, -890, -274, -400, -591, 24, -784, -329, -1135, 248, -259, -237, -398, -1226,
        1447, -206, -2164, -731, -1236, 52, 677, -1438, -933, -1075, -624, 1075, -68, 860, -1008,
        -2084, -490, -921, -222, 492, -335, -1089, -930, 637, -504, -1557, -932, -1263, 208, -612,
        -2, 2133, 123, 454, 386, -356, -156, -394, 463, 1061, 1267, 243, 280, 712, 1156, 1109,
        -883, -480, -350, 257, 1519, 671, -501, -335, -1001, -1764, -6, 561, 308, -220, -1356,
        -667, 547, 235, -398,
    ],
    [
        -68, 1558, -477, -426, 440, -881, 15, -864, 518, 604, -750, 864, 1496, 458, 923, 2111,
        -102, -141, -159, -1075, 1120, 815, -990, -1769, -2049, -1011, 455, 1069, 717, 67, 75, 385,
        -328, 720, 851, -364, -89, -952, -792, -616, -903, 756, -396, -207, 818, -317, -1297, -27,
        1113, 1246, 108, -877, 327, -765, -1437, 1774, 740, -2002, 880, 1082, -975, -1053, -1318,
        -1060, 264, 1317, 577, -1597, -923, -380, -1104, -1218, -1556, -480, -603, -1257, -2058,
        -840, -633, -595,
    ],
    [
        15, -1526, 47, -204, -2409, -1008, 453, -1513, -1286, 1084, -378, -718, -782, -1272, 660,
        1092, 784, 1300, 448, 1464, 2240, 17, 190, 1252, 144, 663, -472, -1184, 310, -202, -549,
        140, 1061, 1410, -468, -1793, -100, 1685, 1489, 1831, 832, -651, 259, 262, -1813, -1035,
        910, -382, -259, 622, 665, -1346, -1013, 233, -81, -46, 617, 1105, -979, -1362, -351, -201,
        -572, -1915, 750, 2560, -758, -231, 172, -535, -1833, -2678, -964, -464, -492, -702, -1045,
        -476, -1448, 344,
    ],
    [
        1816, 1171, 1287, 702, 922, 1289, 795, -33, 710, 126, -729, 1321, 1717, 956, -663, -1110,
        -120, -481, -1365, -388, 906, 401, -296, -856, -106, 429, -1049, -1609, -1713, -1055,
        -1362, -1174, 36, 1077, 1344, 2221, 878, -350, 700, -587, -1157, -320, -611, -837, -81,
        -174, -1303, -1256, -805, 569, 748, 334, 113, 756, 244, -999, 173, 1282, 857, 1360, 929,
        1192, 1633, 1934, 642, -2418, -1565, 223, -404, 323, -1094, 52, 1974, -23, -1068, -506,
        -858, 141, 975, 584,
    ],
    [
        -32, 517, -1465, -1934, 632, 573, -224, 654, 543, 420, -281, 72, 328, -371, -148, -489,
        -366, 751, 120, -1468, -1842, -1435, -459, 354, -793, -548, 1067, 22, -130, -384, 609, 422,
        -767, -29, 518, 2, -536, -148, 868, -208, -886, -444, -1305, -1135, -1597, -467, 791, -436,
        154, 177, 530, -411, -511, 1114, -570, -980, -1018, -1189, -1988, -1133, 210, -264, 677,
        429, 52, -1267, 52, 2246, 339, 556, 1089, 1543, 578, -549, 86, 577, -53, 101, -332, -881,
    ],
    [
        -281, -312, 653, 825, -465, -552, -312, -466, -1235, -1210, -1319, 351, 1110, 748, 1082,
        14, 16, -319, -228, -1183, -1450, -1036, -1962, -1699, -664, -376, 418, 696, 415, 329,
        -178, 417, 608, -16, 213, 81, -954, 134, -1209, -1313, -221, -389, -574, -434, -224, -796,
        420, -1234, -1778, 938, -695, -1672, 279, -463, 5, 653, -25, -110, -610, 459, 430, -1653,
        -1878, -1537, -212, -783, -2779, -185, 823, 1076, 1740, -1199, -1518, 581, -443, 276, 105,
        384, 1291, -458,
    ],
    [
        -831, 482, -595, -848, -801, 409, 24, -518, 179, -502, 803, -246, -1809, 214, 868, -1616,
        -701, 478, -38, -940, 429, 493, 392, 424, -315, -1259, -69, 933, -1161, -957, -439, -182,
        150, 86, -511, -1977, -1732, -916, 737, 686, -750, -6, 840, 2035, 241, -531, 76, -1227,
        -701, 267, -473, -1447, -454, 1230, -397, -1361, 85, -69, -342, -202, -1930, -2693, -882,
        -1166, -597, 389, -1073, -382, 745, 1074, 431, 306, 51, 252, -647, -914, -114, 98, 1140,
        740,
    ],
    [
        -372, -399, -742, -794, 115, -212, -699, -1026, -78, 958, -895, -947, 79, -482, 586, 2237,
        -1595, -457, 1346, 213, -782, -312, 463, -693, 113, -453, -737, 150, 1177, 451, -1068,
        -268, 452, 1077, 321, -20, 367, -1666, 150, 931, 780, 725, 579, -530, -270, 298, -315, 630,
        -560, -240, 688, 31, 834, 1107, 214, 974, -195, -1113, -1272, -990, -1023, -2463, -1082,
        -788, 628, 432, -545, -1151, -1225, -227, 371, 295, -811, 143, 614, 1512, 811, 481, -875,
        -1617,
    ],
    [
        -499, 402, 915, -680, 1453, 1008, -796, -382, 65, 584, 796, 491, -147, 299, -389, -954,
        -489, -190, 1013, 961, -209, -1644, -143, 274, -647, 1152, 1767, 657, -186, -94, 356, 1513,
        1526, 171, -934, 350, 1369, -414, -427, -1358, -1324, -430, 1544, 2210, 207, -700, -2055,
        -1081, -168, -1738, -807, 281, -717, -1251, 717, 593, 842, 1597, -301, 1295, -573, 1070,
        417, -817, 873, -495, -1278, -402, 1189, 1797, 609, -690, -896, -555, 87, -1225, 3, -693,
        -860, 655,
    ],
    [
        -385, -412, -396, 162, 201, -458, -1304, -2182, -406, 892, -378, -330, 1350, 521, -1184,
        -1241, 348, 822, 458, 773, 1642, 2067, 619, 5, -520, -542, 530, 104, -850, -694, -2002,
        -482, 1883, 1407, -52, -564, -1681, -1172, 538, 268, 707, 610, 310, -666, -1108, -801,
        -1906, -558, 387, -534, 201, 589, 1158, 369, -190, -179, -2932, -2374, -1261, -699, 229,
        -1516, -1185, -590, -631, -705, -232, -968, -870, -276, 41, -559, 258, -425, -185, -730,
        -125, 442, -369, 272,
    ],
    [
        -1212, 837, 1163, -1886, -905, -793, -469, 1157, -623, -1149, -538, -1020, 1100, 436, 720,
        229, -2087, -657, -497, -467, 684, 184, -659, -1015, 402, 428, -1381, -792, -1096, -94,
        158, -591, 2095, 1065, 215, 934, -132, 74, -230, 341, 1080, 1525, 807, 275, 846, 1099,
        1618, -104, -668, -9, -44, 1522, 1282, -2, -324, -317, -1666, -439, 753, 575, 244, -845,
        -989, 529, 586, 31, -306, 1458, 633, -815, 804, -499, -47, -350, -62, 1274, -462, 400,
        1724, 1024,
    ],
    [
        598, 2253, 919, -336, 405, -957, 522, 1534, -339, -1368, -1902, -1306, 180, 1178, 1067,
        460, 100, 605, 16, 369, 1329, 48, -1, -395, -917, -245, -940, 504, 379, -492, 908, 354,
        -992, -482, 1092, 1410, 876, -715, 141, 80, -1554, 834, 2042, -1550, -130, 1798, -333,
        -943, -1023, -1135, -64, 1247, 1275, -833, -1320, -62, -843, -913, -1464, -655, -274, -824,
        -1767, -1244, -252, -740, 299, -997, -574, 598, -1800, -1654, 502, -535, -1800, 785, 482,
        -754, -366, -1226,
    ],
    [
        87, 1413, 848, 1420, 872, 1000, 2529, 965, -173, 1399, 580, 590, 328, -1186, 37, 326, -489,
        55, 849, 1682, 461, -1510, -776, 1499, 1748, 1819, 1603, -279, -15, 715, -983, -1673, 810,
        251, -371, 484, 1046, -516, -1384, 195, 175, 44, 417, 1356, -39, -1474, -428, -105, -115,
        -1510, -506, 2896, 416, -696, 510, -231, -1068, -2626, -1433, -298, -410, -364, -975, -383,
        -1035, -488, 1881, 1443, 1421, 1040, 864, 1382, 1199, 268, 486, 793, -707, 749, 1959, 1415,
    ],
    [
        53, -1107, -279, -27, -1083, -779, 766, 851, -2, -544, -470, 731, -482, -1327, -1695,
        -1067, -1099, -1220, -348, 1027, 1287, 2155, 1727, -162, 529, 233, -1214, -336, -354, -691,
        -316, 275, -954, -1165, -987, 291, 934, 626, 195, 668, 751, -605, -375, 1343, 1021, 1355,
        1232, 1111, 1646, 1986, 1538, -1417, -2291, 175, -206, 303, -411, -718, 1888, 979, -965,
        -468, -680, -202, 942, 971, 116, 559, -444, -2225, -31, 1062, -81, 483, 785, 572, 102,
        -123, 580, -122,
    ],
    [
        -121, -193, -474, 543, 713, -926, -1722, -1530, -730, 345, -145, -961, 941, 533, -53, -217,
        272, 915, -447, -296, 594, 335, -296, -336, 766, 469, -841, -332, -929, -1147, -1270,
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];