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| Rev | Author | Line No. | Line |
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| 1 | pmbaty | 1 | /* |
| 2 | * This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>. |
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| 3 | * It is copyright by its individual contributors, as recorded in the |
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| 4 | * project's Git history. See COPYING.txt at the top level for license |
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| 5 | * terms and a link to the Git history. |
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| 6 | */ |
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| 7 | #include "mve_audio.h" |
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| 8 | #include "dxxsconf.h" |
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| 9 | #include <array> |
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| 10 | |||
| 11 | constexpr std::array<int, 256> audio_exp_table{ |
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| 12 | { |
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| 13 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, |
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| 14 | 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, |
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| 15 | 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 47, 51, 56, 61, |
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| 16 | 66, 72, 79, 86, 94, 102, 112, 122, 133, 145, 158, 173, 189, 206, 225, 245, |
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| 17 | 267, 292, 318, 348, 379, 414, 452, 493, 538, 587, 640, 699, 763, 832, 908, 991, |
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| 18 | 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008, |
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| 19 | 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206, |
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| 20 | 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1, |
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| 21 | 1, 1, 5481, 10503, 15105, 19322, 23186, 26728, 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298, |
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| 22 | -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772, |
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| 23 | -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180, |
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| 24 | -1081, -991, -908, -832, -763, -699, -640, -587, -538, -493, -452, -414, -379, -348, -318, -292, |
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| 25 | -267, -245, -225, -206, -189, -173, -158, -145, -133, -122, -112, -102, -94, -86, -79, -72, |
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| 26 | -66, -61, -56, -51, -47, -43, -42, -41, -40, -39, -38, -37, -36, -35, -34, -33, |
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| 27 | -32, -31, -30, -29, -28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18, -17, |
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| 28 | -16, -15, -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1 |
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| 29 | } |
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| 30 | }; |
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| 31 | |||
| 32 | static int getWord(const unsigned char **fin) |
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| 33 | { |
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| 34 | int value = ((*fin)[1] << 8) | (*fin)[0]; |
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| 35 | *fin += 2; |
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| 36 | return value; |
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| 37 | } |
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| 38 | |||
| 39 | static void sendWord(short **fout, int nOffset) |
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| 40 | { |
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| 41 | *(*fout)++ = nOffset; |
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| 42 | } |
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| 43 | |||
| 44 | static void processSwath(short *fout, const unsigned char *data, int swath, int *offsets) |
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| 45 | { |
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| 46 | for (int i=0; i<swath; i++) |
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| 47 | { |
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| 48 | offsets[i&1] += audio_exp_table[data[i]]; |
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| 49 | sendWord(&fout, offsets[i&1]); |
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| 50 | } |
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| 51 | } |
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| 52 | |||
| 53 | void mveaudio_uncompress(short *buffer, const unsigned char *data) |
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| 54 | { |
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| 55 | int nCurOffsets[2]; |
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| 56 | int swath; |
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| 57 | |||
| 58 | data += 4; |
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| 59 | swath = getWord(&data) / 2; |
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| 60 | nCurOffsets[0] = getWord(&data); |
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| 61 | nCurOffsets[1] = getWord(&data); |
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| 62 | sendWord(&buffer, nCurOffsets[0]); |
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| 63 | sendWord(&buffer, nCurOffsets[1]); |
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| 64 | processSwath(buffer, data, swath, nCurOffsets); |
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| 65 | } |