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static int audio_exp_table[256] =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 47, 51, 56, 61,
66, 72, 79, 86, 94, 102, 112, 122, 133, 145, 158, 173, 189, 206, 225, 245,
267, 292, 318, 348, 379, 414, 452, 493, 538, 587, 640, 699, 763, 832, 908, 991,
1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008,
4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206,
17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1,
1, 1, 5481, 10503, 15105, 19322, 23186, 26728, 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298,
-17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772,
-4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180,
-1081, -991, -908, -832, -763, -699, -640, -587, -538, -493, -452, -414, -379, -348, -318, -292,
-267, -245, -225, -206, -189, -173, -158, -145, -133, -122, -112, -102, -94, -86, -79, -72,
-66, -61, -56, -51, -47, -43, -42, -41, -40, -39, -38, -37, -36, -35, -34, -33,
-32, -31, -30, -29, -28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18, -17,
-16, -15, -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1
};
static int getWord(unsigned char **fin)
{
int value = ((*fin)[1] << 8) | (*fin)[0];
*fin += 2;
return value;
}
static void sendWord(short **fout, int nOffset)
{
*(*fout)++ = (short)nOffset;
}
static void processSwath(short *fout, unsigned char *data, int swath, int *offsets)
{
int i;
for (i=0; i<swath; i++) {
offsets[i&1] += audio_exp_table[data[i]];
sendWord(&fout, offsets[i&1]);
}
}
void mveaudio_uncompress(short *buffer, unsigned char *data)
{
int nCurOffsets[2];
int swath;
data += 4;
swath = getWord(&data) / 2;
nCurOffsets[0] = getWord(&data);
nCurOffsets[1] = getWord(&data);
sendWord(&buffer, nCurOffsets[0]);
sendWord(&buffer, nCurOffsets[1]);
processSwath(buffer, data, swath, nCurOffsets);
}
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