/* ScummVM - Graphic Adventure Engine * * ScummVM is the legal property of its developers, whose names * are too numerous to list here. Please refer to the COPYRIGHT * file distributed with this source distribution. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * */ #include "lastexpress/sound/sound.h" #include "lastexpress/helpers.h" #include "lastexpress/lastexpress.h" namespace LastExpress { static int32 adpcmStepSizeTable[] = { 0, 0, 0, 0, 128, 256, 384, 512, 0, 0, 0, 0, 128, 256, 384, 512, 0, 0, 0, 0, 192, 320, 448, 576, 0, 0, 0, 0, 192, 320, 448, 576, 64, 64, 64, 64, 256, 384, 512, 640, 64, 64, 64, 64, 256, 384, 512, 640, 128, 128, 128, 128, 320, 448, 576, 704, 128, 128, 128, 128, 320, 448, 576, 704, 192, 192, 192, 192, 384, 512, 640, 768, 192, 192, 192, 192, 384, 512, 640, 768, 256, 256, 256, 256, 448, 576, 704, 832, 256, 256, 256, 256, 448, 576, 704, 832, 320, 320, 320, 320, 512, 640, 768, 896, 320, 320, 320, 320, 512, 640, 768, 896, 384, 384, 384, 384, 576, 704, 832, 960, 384, 384, 384, 384, 576, 704, 832, 960, 448, 448, 448, 448, 640, 768, 896, 1024, 448, 448, 448, 448, 640, 768, 896, 1024, 512, 512, 512, 512, 704, 832, 960, 1088, 512, 512, 512, 512, 704, 832, 960, 1088, 576, 576, 576, 576, 768, 896, 1024, 1152, 576, 576, 576, 576, 768, 896, 1024, 1152, 640, 640, 640, 640, 832, 960, 1088, 1216, 640, 640, 640, 640, 832, 960, 1088, 1216, 704, 704, 704, 704, 896, 1024, 1152, 1280, 704, 704, 704, 704, 896, 1024, 1152, 1280, 768, 768, 768, 768, 960, 1088, 1216, 1344, 768, 768, 768, 768, 960, 1088, 1216, 1344, 832, 832, 832, 832, 1024, 1152, 1280, 1408, 832, 832, 832, 832, 1024, 1152, 1280, 1408, 896, 896, 896, 896, 1088, 1216, 1344, 1472, 896, 896, 896, 896, 1088, 1216, 1344, 1472, 960, 960, 960, 960, 1152, 1280, 1408, 1536, 960, 960, 960, 960, 1152, 1280, 1408, 1536, 1024, 1024, 1024, 1024, 1216, 1344, 1472, 1600, 1024, 1024, 1024, 1024, 1216, 1344, 1472, 1600, 1088, 1088, 1088, 1088, 1280, 1408, 1536, 1664, 1088, 1088, 1088, 1088, 1280, 1408, 1536, 1664, 1152, 1152, 1152, 1152, 1344, 1472, 1600, 1728, 1152, 1152, 1152, 1152, 1344, 1472, 1600, 1728, 1216, 1216, 1216, 1216, 1408, 1536, 1664, 1792, 1216, 1216, 1216, 1216, 1408, 1536, 1664, 1792, 1280, 1280, 1280, 1280, 1472, 1600, 1728, 1856, 1280, 1280, 1280, 1280, 1472, 1600, 1728, 1856, 1344, 1344, 1344, 1344, 1536, 1664, 1792, 1920, 1344, 1344, 1344, 1344, 1536, 1664, 1792, 1920, 1408, 1408, 1408, 1408, 1600, 1728, 1856, 1984, 1408, 1408, 1408, 1408, 1600, 1728, 1856, 1984, 1472, 1472, 1472, 1472, 1664, 1792, 1920, 2048, 1472, 1472, 1472, 1472, 1664, 1792, 1920, 2048, 1536, 1536, 1536, 1536, 1728, 1856, 1984, 2112, 1536, 1536, 1536, 1536, 1728, 1856, 1984, 2112, 1600, 1600, 1600, 1600, 1792, 1920, 2048, 2176, 1600, 1600, 1600, 1600, 1792, 1920, 2048, 2176, 1664, 1664, 1664, 1664, 1856, 1984, 2112, 2240, 1664, 1664, 1664, 1664, 1856, 1984, 2112, 2240, 1728, 1728, 1728, 1728, 1920, 2048, 2176, 2304, 1728, 1728, 1728, 1728, 1920, 2048, 2176, 2304, 1792, 1792, 1792, 1792, 1984, 2112, 2240, 2368, 1792, 1792, 1792, 1792, 1984, 2112, 2240, 2368, 1856, 1856, 1856, 1856, 2048, 2176, 2304, 2432, 1856, 1856, 1856, 1856, 2048, 2176, 2304, 2432, 1920, 1920, 1920, 1920, 2112, 2240, 2368, 2496, 1920, 1920, 1920, 1920, 2112, 2240, 2368, 2496, 1984, 1984, 1984, 1984, 2176, 2304, 2432, 2560, 1984, 1984, 1984, 1984, 2176, 2304, 2432, 2560, 2048, 2048, 2048, 2048, 2240, 2368, 2496, 2624, 2048, 2048, 2048, 2048, 2240, 2368, 2496, 2624, 2112, 2112, 2112, 2112, 2304, 2432, 2560, 2688, 2112, 2112, 2112, 2112, 2304, 2432, 2560, 2688, 2176, 2176, 2176, 2176, 2368, 2496, 2624, 2752, 2176, 2176, 2176, 2176, 2368, 2496, 2624, 2752, 2240, 2240, 2240, 2240, 2432, 2560, 2688, 2816, 2240, 2240, 2240, 2240, 2432, 2560, 2688, 2816, 2304, 2304, 2304, 2304, 2496, 2624, 2752, 2880, 2304, 2304, 2304, 2304, 2496, 2624, 2752, 2880, 2368, 2368, 2368, 2368, 2560, 2688, 2816, 2944, 2368, 2368, 2368, 2368, 2560, 2688, 2816, 2944, 2432, 2432, 2432, 2432, 2624, 2752, 2880, 3008, 2432, 2432, 2432, 2432, 2624, 2752, 2880, 3008, 2496, 2496, 2496, 2496, 2688, 2816, 2944, 3072, 2496, 2496, 2496, 2496, 2688, 2816, 2944, 3072, 2560, 2560, 2560, 2560, 2752, 2880, 3008, 3136, 2560, 2560, 2560, 2560, 2752, 2880, 3008, 3136, 2624, 2624, 2624, 2624, 2816, 2944, 3072, 3200, 2624, 2624, 2624, 2624, 2816, 2944, 3072, 3200, 2688, 2688, 2688, 2688, 2880, 3008, 3136, 3264, 2688, 2688, 2688, 2688, 2880, 3008, 3136, 3264, 2752, 2752, 2752, 2752, 2944, 3072, 3200, 3328, 2752, 2752, 2752, 2752, 2944, 3072, 3200, 3328, 2816, 2816, 2816, 2816, 3008, 3136, 3264, 3392, 2816, 2816, 2816, 2816, 3008, 3136, 3264, 3392, 2880, 2880, 2880, 2880, 3072, 3200, 3328, 3456, 2880, 2880, 2880, 2880, 3072, 3200, 3328, 3456, 2944, 2944, 2944, 2944, 3136, 3264, 3392, 3520, 2944, 2944, 2944, 2944, 3136, 3264, 3392, 3520, 3008, 3008, 3008, 3008, 3200, 3328, 3456, 3584, 3008, 3008, 3008, 3008, 3200, 3328, 3456, 3584, 3072, 3072, 3072, 3072, 3264, 3392, 3520, 3648, 3072, 3072, 3072, 3072, 3264, 3392, 3520, 3648, 3136, 3136, 3136, 3136, 3328, 3456, 3584, 3712, 3136, 3136, 3136, 3136, 3328, 3456, 3584, 3712, 3200, 3200, 3200, 3200, 3392, 3520, 3648, 3776, 3200, 3200, 3200, 3200, 3392, 3520, 3648, 3776, 3264, 3264, 3264, 3264, 3456, 3584, 3712, 3840, 3264, 3264, 3264, 3264, 3456, 3584, 3712, 3840, 3328, 3328, 3328, 3328, 3520, 3648, 3776, 3904, 3328, 3328, 3328, 3328, 3520, 3648, 3776, 3904, 3392, 3392, 3392, 3392, 3584, 3712, 3840, 3968, 3392, 3392, 3392, 3392, 3584, 3712, 3840, 3968, 3456, 3456, 3456, 3456, 3648, 3776, 3904, 4032, 3456, 3456, 3456, 3456, 3648, 3776, 3904, 4032, 3520, 3520, 3520, 3520, 3712, 3840, 3968, 4096, 3520, 3520, 3520, 3520, 3712, 3840, 3968, 4096, 3584, 3584, 3584, 3584, 3776, 3904, 4032, 4160, 3584, 3584, 3584, 3584, 3776, 3904, 4032, 4160, 3648, 3648, 3648, 3648, 3840, 3968, 4096, 4224, 3648, 3648, 3648, 3648, 3840, 3968, 4096, 4224, 3712, 3712, 3712, 3712, 3904, 4032, 4160, 4288, 3712, 3712, 3712, 3712, 3904, 4032, 4160, 4288, 3776, 3776, 3776, 3776, 3968, 4096, 4224, 4352, 3776, 3776, 3776, 3776, 3968, 4096, 4224, 4352, 3840, 3840, 3840, 3840, 4032, 4160, 4288, 4416, 3840, 3840, 3840, 3840, 4032, 4160, 4288, 4416, 3904, 3904, 3904, 3904, 4096, 4224, 4352, 4480, 3904, 3904, 3904, 3904, 4096, 4224, 4352, 4480, 3968, 3968, 3968, 3968, 4160, 4288, 4416, 4544, 3968, 3968, 3968, 3968, 4160, 4288, 4416, 4544, 4032, 4032, 4032, 4032, 4224, 4352, 4480, 4608, 4032, 4032, 4032, 4032, 4224, 4352, 4480, 4608, 4096, 4096, 4096, 4096, 4288, 4416, 4544, 4672, 4096, 4096, 4096, 4096, 4288, 4416, 4544, 4672, 4160, 4160, 4160, 4160, 4352, 4480, 4608, 4736, 4160, 4160, 4160, 4160, 4352, 4480, 4608, 4736, 4224, 4224, 4224, 4224, 4416, 4544, 4672, 4800, 4224, 4224, 4224, 4224, 4416, 4544, 4672, 4800, 4288, 4288, 4288, 4288, 4480, 4608, 4736, 4864, 4288, 4288, 4288, 4288, 4480, 4608, 4736, 4864, 4352, 4352, 4352, 4352, 4544, 4672, 4800, 4928, 4352, 4352, 4352, 4352, 4544, 4672, 4800, 4928, 4416, 4416, 4416, 4416, 4608, 4736, 4864, 4992, 4416, 4416, 4416, 4416, 4608, 4736, 4864, 4992, 4480, 4480, 4480, 4480, 4672, 4800, 4928, 5056, 4480, 4480, 4480, 4480, 4672, 4800, 4928, 5056, 4544, 4544, 4544, 4544, 4736, 4864, 4992, 5120, 4544, 4544, 4544, 4544, 4736, 4864, 4992, 5120, 4608, 4608, 4608, 4608, 4800, 4928, 5056, 5184, 4608, 4608, 4608, 4608, 4800, 4928, 5056, 5184, 4672, 4672, 4672, 4672, 4864, 4992, 5120, 5248, 4672, 4672, 4672, 4672, 4864, 4992, 5120, 5248, 4736, 4736, 4736, 4736, 4928, 5056, 5184, 5312, 4736, 4736, 4736, 4736, 4928, 5056, 5184, 5312, 4800, 4800, 4800, 4800, 4992, 5120, 5248, 5376, 4800, 4800, 4800, 4800, 4992, 5120, 5248, 5376, 4864, 4864, 4864, 4864, 5056, 5184, 5312, 5440, 4864, 4864, 4864, 4864, 5056, 5184, 5312, 5440, 4928, 4928, 4928, 4928, 5120, 5248, 5376, 5504, 4928, 4928, 4928, 4928, 5120, 5248, 5376, 5504, 4992, 4992, 4992, 4992, 5184, 5312, 5440, 5568, 4992, 4992, 4992, 4992, 5184, 5312, 5440, 5568, 5056, 5056, 5056, 5056, 5248, 5376, 5504, 5632, 5056, 5056, 5056, 5056, 5248, 5376, 5504, 5632, 5120, 5120, 5120, 5120, 5312, 5440, 5568, 5632, 5120, 5120, 5120, 5120, 5312, 5440, 5568, 5632, 5184, 5184, 5184, 5184, 5376, 5504, 5632, 5632, 5184, 5184, 5184, 5184, 5376, 5504, 5632, 5632, 5248, 5248, 5248, 5248, 5440, 5568, 5632, 5632, 5248, 5248, 5248, 5248, 5440, 5568, 5632, 5632, 5312, 5312, 5312, 5312, 5504, 5632, 5632, 5632, 5312, 5312, 5312, 5312, 5504, 5632, 5632, 5632, 5376, 5376, 5376, 5376, 5568, 5632, 5632, 5632, 5376, 5376, 5376, 5376, 5568, 5632, 5632, 5632, 5440, 5440, 5440, 5440, 5632, 5632, 5632, 5632, 5440, 5440, 5440, 5440, 5632, 5632, 5632, 5632, 5504, 5504, 5504, 5504, 5632, 5632, 5632, 5632, 5504, 5504, 5504, 5504, 5632, 5632, 5632, 5632, 5568, 5568, 5568, 5568, 5632, 5632, 5632, 5632, 5568, 5568, 5568, 5568, 5632, 5632, 5632, 5632 }; static int32 adpcmDeltaTable[] = { 0, 2, 4, 6, 7, 9, 11, 13, 0, -2, -4, -6, -7, -9, -11, -13, 1, 3, 5, 7, 9, 11, 13, 15, -1, -3, -5, -7, -9, -11, -13, -15, 1, 3, 5, 7, 10, 12, 14, 16, -1, -3, -5, -7, -10, -12, -14, -16, 1, 3, 6, 8, 11, 13, 16, 18, -1, -3, -6, -8, -11, -13, -16, -18, 1, 4, 6, 9, 12, 15, 17, 20, -1, -4, -6, -9, -12, -15, -17, -20, 1, 4, 7, 10, 13, 16, 19, 22, -1, -4, -7, -10, -13, -16, -19, -22, 1, 4, 8, 11, 14, 17, 21, 24, -1, -4, -8, -11, -14, -17, -21, -24, 1, 5, 8, 12, 15, 19, 22, 26, -1, -5, -8, -12, -15, -19, -22, -26, 2, 6, 10, 14, 18, 22, 26, 30, -2, -6, -10, -14, -18, -22, -26, -30, 2, 6, 10, 14, 19, 23, 27, 31, -2, -6, -10, -14, -19, -23, -27, -31, 2, 7, 11, 16, 21, 26, 30, 35, -2, -7, -11, -16, -21, -26, -30, -35, 2, 7, 13, 18, 23, 28, 34, 39, -2, -7, -13, -18, -23, -28, -34, -39, 2, 8, 14, 20, 25, 31, 37, 43, -2, -8, -14, -20, -25, -31, -37, -43, 3, 9, 15, 21, 28, 34, 40, 46, -3, -9, -15, -21, -28, -34, -40, -46, 3, 10, 17, 24, 31, 38, 45, 52, -3, -10, -17, -24, -31, -38, -45, -52, 3, 11, 19, 27, 34, 42, 50, 58, -3, -11, -19, -27, -34, -42, -50, -58, 4, 12, 21, 29, 38, 46, 55, 63, -4, -12, -21, -29, -38, -46, -55, -63, 4, 13, 23, 32, 41, 50, 60, 69, -4, -13, -23, -32, -41, -50, -60, -69, 5, 15, 25, 35, 46, 56, 66, 76, -5, -15, -25, -35, -46, -56, -66, -76, 5, 16, 28, 39, 50, 61, 73, 84, -5, -16, -28, -39, -50, -61, -73, -84, 6, 18, 31, 43, 56, 68, 81, 93, -6, -18, -31, -43, -56, -68, -81, -93, 6, 20, 34, 48, 61, 75, 89, 103, -6, -20, -34, -48, -61, -75, -89, -103, 7, 22, 37, 52, 67, 82, 97, 112, -7, -22, -37, -52, -67, -82, -97, -112, 8, 24, 41, 57, 74, 90, 107, 123, -8, -24, -41, -57, -74, -90, -107, -123, 9, 27, 45, 63, 82, 100, 118, 136, -9, -27, -45, -63, -82, -100, -118, -136, 10, 30, 50, 70, 90, 110, 130, 150, -10, -30, -50, -70, -90, -110, -130, -150, 11, 33, 55, 77, 99, 121, 143, 165, -11, -33, -55, -77, -99, -121, -143, -165, 12, 36, 60, 84, 109, 133, 157, 181, -12, -36, -60, -84, -109, -133, -157, -181, 13, 40, 66, 93, 120, 147, 173, 200, -13, -40, -66, -93, -120, -147, -173, -200, 14, 44, 73, 103, 132, 162, 191, 221, -14, -44, -73, -103, -132, -162, -191, -221, 16, 48, 81, 113, 146, 178, 211, 243, -16, -48, -81, -113, -146, -178, -211, -243, 17, 53, 89, 125, 160, 196, 232, 268, -17, -53, -89, -125, -160, -196, -232, -268, 19, 58, 98, 137, 176, 215, 255, 294, -19, -58, -98, -137, -176, -215, -255, -294, 21, 64, 108, 151, 194, 237, 281, 324, -21, -64, -108, -151, -194, -237, -281, -324, 23, 71, 118, 166, 213, 261, 308, 356, -23, -71, -118, -166, -213, -261, -308, -356, 26, 78, 130, 182, 235, 287, 339, 391, -26, -78, -130, -182, -235, -287, -339, -391, 28, 86, 143, 201, 258, 316, 373, 431, -28, -86, -143, -201, -258, -316, -373, -431, 31, 94, 158, 221, 284, 347, 411, 474, -31, -94, -158, -221, -284, -347, -411, -474, 34, 104, 174, 244, 313, 383, 453, 523, -34, -104, -174, -244, -313, -383, -453, -523, 38, 115, 191, 268, 345, 422, 498, 575, -38, -115, -191, -268, -345, -422, -498, -575, 42, 126, 210, 294, 379, 463, 547, 631, -42, -126, -210, -294, -379, -463, -547, -631, 46, 139, 231, 324, 417, 510, 602, 695, -46, -139, -231, -324, -417, -510, -602, -695, 51, 153, 255, 357, 459, 561, 663, 765, -51, -153, -255, -357, -459, -561, -663, -765, 56, 168, 280, 392, 505, 617, 729, 841, -56, -168, -280, -392, -505, -617, -729, -841, 61, 185, 308, 432, 555, 679, 802, 926, -61, -185, -308, -432, -555, -679, -802, -926, 68, 204, 340, 476, 612, 748, 884, 1020, -68, -204, -340, -476, -612, -748, -884, -1020, 74, 224, 373, 523, 672, 822, 971, 1121, -74, -224, -373, -523, -672, -822, -971, -1121, 82, 246, 411, 575, 740, 904, 1069, 1233, -82, -246, -411, -575, -740, -904, -1069, -1233, 90, 271, 452, 633, 814, 995, 1176, 1357, -90, -271, -452, -633, -814, -995, -1176, -1357, 99, 298, 497, 696, 895, 1094, 1293, 1492, -99, -298, -497, -696, -895, -1094, -1293, -1492, 109, 328, 547, 766, 985, 1204, 1423, 1642, -109, -328, -547, -766, -985, -1204, -1423, -1642, 120, 361, 601, 842, 1083, 1324, 1564, 1805, -120, -361, -601, -842, -1083, -1324, -1564, -1805, 132, 397, 662, 927, 1192, 1457, 1722, 1987, -132, -397, -662, -927, -1192, -1457, -1722, -1987, 145, 437, 728, 1020, 1311, 1603, 1894, 2186, -145, -437, -728, -1020, -1311, -1603, -1894, -2186, 160, 480, 801, 1121, 1442, 1762, 2083, 2403, -160, -480, -801, -1121, -1442, -1762, -2083, -2403, 176, 529, 881, 1234, 1587, 1940, 2292, 2645, -176, -529, -881, -1234, -1587, -1940, -2292, -2645, 194, 582, 970, 1358, 1746, 2134, 2522, 2910, -194, -582, -970, -1358, -1746, -2134, -2522, -2910, 213, 640, 1066, 1493, 1920, 2347, 2773, 3200, -213, -640, -1066, -1493, -1920, -2347, -2773, -3200, 234, 704, 1173, 1643, 2112, 2582, 3051, 3521, -234, -704, -1173, -1643, -2112, -2582, -3051, -3521, 258, 774, 1291, 1807, 2324, 2840, 3357, 3873, -258, -774, -1291, -1807, -2324, -2840, -3357, -3873, 284, 852, 1420, 1988, 2556, 3124, 3692, 4260, -284, -852, -1420, -1988, -2556, -3124, -3692, -4260, 312, 937, 1561, 2186, 2811, 3436, 4060, 4685, -312, -937, -1561, -2186, -2811, -3436, -4060, -4685, 343, 1030, 1718, 2405, 3092, 3779, 4467, 5154, -343, -1030, -1718, -2405, -3092, -3779, -4467, -5154, 378, 1134, 1890, 2646, 3402, 4158, 4914, 5670, -378, -1134, -1890, -2646, -3402, -4158, -4914, -5670, 415, 1247, 2079, 2911, 3742, 4574, 5406, 6238, -415, -1247, -2079, -2911, -3742, -4574, -5406, -6238, 457, 1372, 2287, 3202, 4117, 5032, 5947, 6862, -457, -1372, -2287, -3202, -4117, -5032, -5947, -6862, 503, 1509, 2516, 3522, 4529, 5535, 6542, 7548, -503, -1509, -2516, -3522, -4529, -5535, -6542, -7548, 553, 1660, 2767, 3874, 4981, 6088, 7195, 8302, -553, -1660, -2767, -3874, -4981, -6088, -7195, -8302, 608, 1826, 3044, 4262, 5479, 6697, 7915, 9133, -608, -1826, -3044, -4262, -5479, -6697, -7915, -9133, 669, 2009, 3348, 4688, 6027, 7367, 8706, 10046, -669, -2009, -3348, -4688, -6027, -7367, -8706, -10046, 736, 2210, 3683, 5157, 6630, 8104, 9577, 11051, -736, -2210, -3683, -5157, -6630, -8104, -9577, -11051, 810, 2431, 4052, 5673, 7294, 8915, 10536, 12157, -810, -2431, -4052, -5673, -7294, -8915, -10536, -12157, 891, 2674, 4457, 6240, 8023, 9806, 11589, 13372, -891, -2674, -4457, -6240, -8023, -9806, -11589, -13372, 980, 2941, 4903, 6864, 8825, 10786, 12748, 14709, -980, -2941, -4903, -6864, -8825, -10786, -12748, -14709, 1078, 3236, 5393, 7551, 9708, 11866, 14023, 16181, -1078, -3236, -5393, -7551, -9708, -11866, -14023, -16181, 1186, 3559, 5933, 8306, 10679, 13052, 15426, 17799, -1186, -3559, -5933, -8306, -10679, -13052, -15426, -17799, 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-25183, -30779, -32767, -32767, 3077, 9233, 15389, 21545, 27700, 32767, 32767, 32767, -3077, -9233, -15389, -21545, -27700, -32767, -32767, -32767, 3385, 10157, 16928, 23700, 30471, 32767, 32767, 32767, -3385, -10157, -16928, -23700, -30471, -32767, -32767, -32767, 3724, 11172, 18621, 26069, 32767, 32767, 32767, 32767, -3724, -11172, -18621, -26069, -32767, -32767, -32767, -32767, 4095, 12287, 20479, 28671, 32767, 32767, 32767, 32767, -4095, -12287, -20479, -28671, -32767, -32767, -32767, -32767 }; void static decodeSamples(int32 volumeLevel, int32 stepSizeIdx, int32 initSampleCount, int32 predictorValue, int16 *outputBuffer, byte *compressedBuffer) { if (volumeLevel == 0) return; // The game originally used 17 practically identical functions, one // for each volume level. This is a neat way to only write a single // function, and still replicate perfectly what should happen... static const struct VolumeParams { int multiplier; int shift; } volumeParams[17] = { {0, 0}, // Volume 0 {1, 4}, // Volume 1 {1, 3}, // Volume 2 {3, 4}, // Volume 3 {1, 2}, // Volume 4 {5, 4}, // Volume 5 {3, 3}, // Volume 6 {7, 4}, // Volume 7 {1, 1}, // Volume 8 {9, 4}, // Volume 9 {5, 3}, // Volume 10 {11, 4}, // Volume 11 {3, 2}, // Volume 12 {13, 4}, // Volume 13 {7, 3}, // Volume 14 {15, 4}, // Volume 15 {1, 0} // Volume 16 }; const VolumeParams ¶ms = volumeParams[volumeLevel]; uint32 stepSize = stepSizeIdx; int32 initialPredictor = predictorValue; int32 idx; for (int32 count = initSampleCount; count < 735; count++) { // Process and write the first sample... idx = (compressedBuffer[count] >> 4); int32 sample1 = adpcmDeltaTable[idx + (stepSize >> 2)] + initialPredictor; int32 newStepSize = adpcmStepSizeTable[idx + (stepSize >> 2)]; if (sample1 > 0x7FFF) { sample1 = 0x7FFF; } if (sample1 < -0x7FFF) { sample1 = -0x7FFF; } outputBuffer[2 * count] = (int16)((params.multiplier * sample1) >> params.shift); // Process and write the second sample... idx = (compressedBuffer[count] & 0xF); if (idx + (stepSize >> 2) > 1424) { warning("invalid stepSize %d >> 2 == %d", stepSize, (stepSize >> 2)); stepSize = 0; } int32 sample2 = adpcmDeltaTable[idx + (newStepSize >> 2)] + sample1; stepSize = adpcmStepSizeTable[idx + (newStepSize >> 2)]; if (sample2 > 0x7FFF) { sample2 = 0x7FFF; } if (sample2 < -0x7FFF) { sample2 = -0x7FFF; } outputBuffer[2 * count + 1] = (int16)((params.multiplier * sample2) >> params.shift); initialPredictor = sample2; } } void SoundManager::mix(Slot *slot, int16 *outBuf) { int16 *currentDataPtr = (int16 *)slot->_currentDataPtr; int32 predictorValue = READ_LE_INT16(¤tDataPtr[0]); uint32 stepSizeIndex = READ_LE_INT16(¤tDataPtr[1]) << 6; if (stepSizeIndex > 5632) { slot->_statusFlags |= kSoundFlagDecodeError; } else { // decodeSamples() is an ADPCM decoder, // receiving the following params: // 1. Volume // 2. Step size index // 3. Initial sample count (0) // 4. Predictor value // 5. Output buffer // 6. Compressed ADPCM data pointer Slot *slotTmp = slot; decodeSamples( (slot->_statusFlags & kSoundVolumeMask), stepSizeIndex, 0, predictorValue, outBuf, (byte *)(currentDataPtr + 2)); slotTmp->_currentDataPtr += 739; } } void SoundManager::mixEngine() { int numChannels; int volume; int fadeDelayCounter; int statusFlags; Slot *cachedSlot; Slot *nextCachedSlot; Slot *soundChannels[6]; if (_soundEngineToggle) { _soundDriverFlags |= kSoundDriverStarted; } else { _soundEngineToggle = true; if ((_soundDriverFlags & kSoundDriverNISHasRequestedDelay) == 0) ++_soundDriverTicks; int16 *mixBuffer = _soundMixBuffer; if ((_soundDriverFlags & kSoundFlagUnmuteRequested) != 0) _soundDriverFlags &= ~kSoundFlagUnmuteRequested; if ((_soundDriverFlags & kSoundDriverClearBufferRequested) != 0) { if ((_soundDriverFlags & kSoundDriverClearBufferProcessed) == 0) _soundDriverFlags |= kSoundDriverClearBufferProcessed; memset(_soundMixBuffer, 0, 1470 * sizeof(int16)); } else { cachedSlot = _soundCache; if (_soundCache) { do { nextCachedSlot = cachedSlot->_next; if ((cachedSlot->_statusFlags & kSoundFlagPlayRequested) != 0) { cachedSlot->_statusFlags |= kSoundFlagPlaying; if ((cachedSlot->_statusFlags & kSoundFlagHasUnreadData) == 0 || (cachedSlot->_statusFlags & kSoundFlagMute) != 0 || cachedSlot->_blockCount <= 1 || (739 * (cachedSlot->_time + 1)) <= cachedSlot->_loadedBytes) { cachedSlot->_statusFlags &= ~kSoundFlagDecodeStall; } else { cachedSlot->_statusFlags |= kSoundFlagDecodeStall; } } if ((cachedSlot->_statusFlags & kSoundFlagPauseRequested) != 0) cachedSlot->_statusFlags |= kSoundFlagPaused; if ((cachedSlot->_statusFlags & kSoundFlagMuteRequested) != 0) cachedSlot->_statusFlags |= kSoundFlagMuteProcessed; cachedSlot = nextCachedSlot; } while (nextCachedSlot); } cachedSlot = _soundCache; numChannels = 0; if (_soundCache) { do { nextCachedSlot = cachedSlot->_next; if ((cachedSlot->_statusFlags & kSoundFlagPlaying) != 0 && (cachedSlot->_statusFlags & (kSoundFlagDecodeError | kSoundFlagDecodeStall | kSoundFlagPaused | kSoundFlagClosed | kSoundFlagCloseRequested | kSoundFlagMuteProcessed)) == 0 && cachedSlot->_soundBuffer && (cachedSlot->_statusFlags & kSoundVolumeMask) != 0 && cachedSlot->_blockCount) { if (cachedSlot->_currentDataPtr) { soundChannels[numChannels] = cachedSlot; numChannels++; } else { cachedSlot->_statusFlags |= (kSoundFlagDecodeError | kSoundFlagCloseRequested); } } cachedSlot = nextCachedSlot; } while (nextCachedSlot); } _copyingDataToSoundDriver = true; if (numChannels == 0 || (_soundDriverFlags & kSoundDriverClearBufferProcessed) != 0) { memset(mixBuffer, 0, 1470 * sizeof(int16)); } else { for (int j = 0; j < numChannels; j++) { if (numChannels == 1) { mix(soundChannels[j], mixBuffer); } else { mix(soundChannels[j], _soundChannelsMixBuffers[j]); } if ((soundChannels[j]->_statusFlags & kSoundFlagDecodeError) != 0) { if (numChannels <= 1) { memset(mixBuffer, 0, 1470 * sizeof(int16)); } else { memset(_soundChannelsMixBuffers[j], 0, 1470 * sizeof(int16)); } } byte *currentDataPtr = soundChannels[j]->_currentDataPtr; if (soundChannels[j]->_dataEnd <= currentDataPtr) { if ((soundChannels[j]->_statusFlags & kSoundFlagLooped) != 0) { soundChannels[j]->_currentDataPtr = soundChannels[j]->_dataStart + 6; } else if ((soundChannels[j]->_statusFlags & kSoundFlagCyclicBuffer) != 0) { soundChannels[j]->_currentDataPtr = ¤tDataPtr[-soundChannels[j]->_size]; } else { soundChannels[j]->_statusFlags |= kSoundFlagCloseRequested; } } } } _copyingDataToSoundDriver = false; if (numChannels > 1) mixChannels(numChannels, mixBuffer); cachedSlot = _soundCache; if (_soundCache) { do { nextCachedSlot = cachedSlot->_next; statusFlags = cachedSlot->_statusFlags; if ((cachedSlot->_statusFlags & kSoundFlagPlaying) != 0 && (cachedSlot->_statusFlags & (kSoundFlagDecodeStall | kSoundFlagPaused)) == 0) { cachedSlot->_time++; cachedSlot->_blockCount--; if ((statusFlags & kSoundFlagCloseOnDataEnd) != 0 && cachedSlot->_blockCount <= 0) statusFlags |= kSoundFlagCloseRequested; if ((statusFlags & kSoundFlagVolumeChanging) != 0) { volume = statusFlags & kSoundVolumeMask; if (cachedSlot->_fadeTargetVolume == volume) { statusFlags &= ~kSoundFlagVolumeChanging; } else { fadeDelayCounter = cachedSlot->_fadeDelayCounter; cachedSlot->_fadeDelayCounter = fadeDelayCounter + 1; if (fadeDelayCounter > 3) { if (cachedSlot->_fadeTargetVolume <= volume) { volume--; } else { volume++; } cachedSlot->_fadeDelayCounter = 0; } } if (volume <= 0) statusFlags |= kSoundFlagCloseRequested; statusFlags = (statusFlags & ~kSoundVolumeMask) | (volume & kSoundVolumeMask); } } if ((statusFlags & kSoundFlagCloseRequested) != 0 && (statusFlags & kSoundFlagHasLinkAfter) != 0) { cachedSlot->_chainedSound->play(); statusFlags &= ~kSoundFlagHasLinkAfter; } cachedSlot->_statusFlags = statusFlags; cachedSlot = nextCachedSlot; } while (nextCachedSlot); } } cachedSlot = _soundCache; if (_soundCache) { do { cachedSlot->_statusFlags &= ~kSoundFlagUnmuteRequested; nextCachedSlot = cachedSlot->_next; if ((cachedSlot->_statusFlags & (kSoundFlagDecodeError | kSoundFlagCloseRequested)) != 0) { cachedSlot->_statusFlags |= kSoundFlagClosed; } cachedSlot = nextCachedSlot; } while (nextCachedSlot); } _soundEngineToggle = false; } } void SoundManager::mixChannels(int numChannels, int16 *buffer) { int sampleVal; // This is actually how they mix channels in the original :-) // It's probably done this way because as a possible optimization; // we shouldn't need this, but for now I'll replicate exactly what was done. switch (numChannels) { case 2: for (int i = 0; i < 1470; i++) { sampleVal = _soundChannelsMixBuffers[0][i] + _soundChannelsMixBuffers[1][i]; if (sampleVal > 0x7FFF) sampleVal = 0x7FFF; if (sampleVal < -0x7FFF) sampleVal = -0x7FFF; buffer[i] = (int16)sampleVal; } break; case 3: for (int i = 0; i < 1470; i++) { sampleVal = _soundChannelsMixBuffers[0][i] + _soundChannelsMixBuffers[1][i] + _soundChannelsMixBuffers[2][i]; if (sampleVal > 0x7FFF) sampleVal = 0x7FFF; if (sampleVal < -0x7FFF) sampleVal = -0x7FFF; buffer[i] = (int16)sampleVal; } break; case 4: for (int i = 0; i < 1470; i++) { sampleVal = _soundChannelsMixBuffers[0][i] + _soundChannelsMixBuffers[1][i] + _soundChannelsMixBuffers[2][i] + _soundChannelsMixBuffers[3][i]; if (sampleVal > 0x7FFF) sampleVal = 0x7FFF; if (sampleVal < -0x7FFF) sampleVal = -0x7FFF; buffer[i] = (int16)sampleVal; } break; case 5: for (int i = 0; i < 1470; i++) { sampleVal = _soundChannelsMixBuffers[0][i] + _soundChannelsMixBuffers[1][i] + _soundChannelsMixBuffers[2][i] + _soundChannelsMixBuffers[3][i] + _soundChannelsMixBuffers[4][i]; if (sampleVal > 0x7FFF) sampleVal = 0x7FFF; if (sampleVal < -0x7FFF) sampleVal = -0x7FFF; buffer[i] = (int16)sampleVal; } break; case 6: for (int i = 0; i < 1470; i++) { sampleVal = _soundChannelsMixBuffers[0][i] + _soundChannelsMixBuffers[1][i] + _soundChannelsMixBuffers[2][i] + _soundChannelsMixBuffers[3][i] + _soundChannelsMixBuffers[4][i] + _soundChannelsMixBuffers[5][i]; if (sampleVal > 0x7FFF) sampleVal = 0x7FFF; if (sampleVal < -0x7FFF) sampleVal = -0x7FFF; buffer[i] = (int16)sampleVal; } break; default: return; } } } // End of namespace LastExpress