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Leon Krieg
2026-02-02 04:50:13 +01:00
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/* 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 <http://www.gnu.org/licenses/>.
*
*/
#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, 1305,
3915, 6526, 9136, 11747, 14357, 16968, 19578, -1305,
-3915, -6526, -9136, -11747, -14357, -16968, -19578,
1435, 4307, 7179, 10051, 12922, 15794, 18666, 21538,
-1435, -4307, -7179, -10051, -12922, -15794, -18666,
-21538, 1579, 4738, 7896, 11055, 14214, 17373, 20531,
23690, -1579, -4738, -7896, -11055, -14214, -17373,
-20531, -23690, 1737, 5212, 8686, 12161, 15636, 19111,
22585, 26060, -1737, -5212, -8686, -12161, -15636, -19111,
-22585, -26060, 1911, 5733, 9555, 13377, 17200, 21022,
24844, 28666, -1911, -5733, -9555, -13377, -17200, -21022,
-24844, -28666, 2102, 6306, 10511, 14715, 18920, 23124,
27329, 31533, -2102, -6306, -10511, -14715, -18920,
-23124, -27329, -31533, 2312, 6937, 11562, 16187, 20812,
25437, 30062, 32767, -2312, -6937, -11562, -16187, -20812,
-25437, -30062, -32767, 2543, 7631, 12718, 17806, 22893,
27981, 32767, 32767, -2543, -7631, -12718, -17806, -22893,
-27981, -32767, -32767, 2798, 8394, 13990, 19586, 25183,
30779, 32767, 32767, -2798, -8394, -13990, -19586, -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 &params = 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(&currentDataPtr[0]);
uint32 stepSizeIndex = READ_LE_INT16(&currentDataPtr[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 = &currentDataPtr[-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