private void DecompressBlock(List <short> pSmp, int a, VAGBlk pVBlk)
{
float[,] coeff =
{
{ 0.0f, 0.0f },
{ 60.0f / 64.0f, 0.0f },
{ 115.0f / 64.0f, 52.0f / 64.0f },
{ 98.0f / 64.0f, 55.0f / 64.0f },
{ 122.0f / 64.0f, 60.0f / 64.0f }
};
int i;
short t;
float f1, f2;
float p1, p2;
int shift = pVBlk.range + 16;
for (i = 0; i < 14; i++)
{
pSmp[a + i * 2] = (short)(((int)pVBlk.brr[i] << 28) >> shift);
pSmp[a + i * 2 + 1] = (short)(((int)(pVBlk.brr[i] & 0xF0) << 24) >> shift);
}
// Apply ADPCM decompression ----------------
i = pVBlk.filter;
if (i > 0)
{
f1 = coeff[i, 0];
f2 = coeff[i, 1];
p1 = prev1;
p2 = prev2;
for (i = 0; i < 28; i++)
{
t = (short)Math.Round(pSmp[a + i] + (p1 * f1) - (p2 * f2));
pSmp[a + i] = t;
p2 = p1;
p1 = t;
}
prev1 = p1;
prev2 = p2;
}
else
{
prev2 = pSmp[a + 26];
prev1 = pSmp[a + 27];
}
}
private List <short> DecompressDatas()
{
List <short> decomp = new List <short>();
loopStatus = 0;
prev1 = 0;
prev2 = 0;
for (uint k = 0; k < NumBlocks; k++)
{
VAGBlk theBlock = new VAGBlk(data[k * 16], data[k * 16 + 1]);
for (uint l = 2; l < 16; l++)
{
theBlock.brr[l - 2] = data[k * 16 + l];
}
decomp.AddRange(new short[28]);
if (data[k * 16] != 0xFF && data[k * 16 + 1] != 0xFF)
{
DecompressBlock(decomp, (int)(k * 28), theBlock);
}
}
_IsDecompressed = true;
return(decomp);
}
