protected void unpInitData20(bool Solid)
{
if (!Solid)
{
UnpChannelDelta = UnpCurChannel = 0;
UnpChannels = 1;
// memset(AudV,0,sizeof(AudV));
AudV[0] = new AudioVariables();
AudV[1] = new AudioVariables();
AudV[2] = new AudioVariables();
AudV[3] = new AudioVariables();
// memset(UnpOldTable20,0,sizeof(UnpOldTable20));
Utility.Fill(UnpOldTable20, (byte)0);
}
}
private byte DecodeAudio(int Delta)
{
AudioVariables v = AudV[UnpCurChannel];
v.ByteCount = v.ByteCount + 1;
v.D4 = v.D3;
v.D3 = v.D2; // ->D3=V->D2;
v.D2 = v.LastDelta - v.D1; // ->D2=V->LastDelta-V->D1;
v.D1 = v.LastDelta; // V->D1=V->LastDelta;
// int PCh=8*V->LastChar+V->K1*V->D1 +V->K2*V->D2 +V->K3*V->D3
// +V->K4*V->D4+ V->K5*UnpChannelDelta;
int PCh = 8 * v.LastChar + v.K1 * v.D1;
PCh += v.K2 * v.D2 + v.K3 * v.D3;
PCh += v.K4 * v.D4 + v.K5 * UnpChannelDelta;
PCh = (Utility.URShift(PCh, 3)) & 0xFF;
int Ch = PCh - Delta;
int D = ((byte)Delta) << 3;
v.Dif[0] += System.Math.Abs(D); // V->Dif[0]+=abs(D);
v.Dif[1] += System.Math.Abs(D - v.D1); // V->Dif[1]+=abs(D-V->D1);
v.Dif[2] += System.Math.Abs(D + v.D1); // V->Dif[2]+=abs(D+V->D1);
v.Dif[3] += System.Math.Abs(D - v.D2); // V->Dif[3]+=abs(D-V->D2);
v.Dif[4] += System.Math.Abs(D + v.D2); // V->Dif[4]+=abs(D+V->D2);
v.Dif[5] += System.Math.Abs(D - v.D3); // V->Dif[5]+=abs(D-V->D3);
v.Dif[6] += System.Math.Abs(D + v.D3); // V->Dif[6]+=abs(D+V->D3);
v.Dif[7] += System.Math.Abs(D - v.D4); // V->Dif[7]+=abs(D-V->D4);
v.Dif[8] += System.Math.Abs(D + v.D4); // V->Dif[8]+=abs(D+V->D4);
v.Dif[9] += System.Math.Abs(D - UnpChannelDelta); // V->Dif[9]+=abs(D-UnpChannelDelta);
v.Dif[10] += System.Math.Abs(D + UnpChannelDelta); // V->Dif[10]+=abs(D+UnpChannelDelta);
v.LastDelta = (byte)(Ch - v.LastChar);
UnpChannelDelta = v.LastDelta;
v.LastChar = Ch; // V->LastChar=Ch;
if ((v.ByteCount & 0x1F) == 0)
{
int MinDif = v.Dif[0], NumMinDif = 0;
v.Dif[0] = 0; // ->Dif[0]=0;
for (int I = 1; I < v.Dif.Length; I++)
{
if (v.Dif[I] < MinDif)
{
MinDif = v.Dif[I];
NumMinDif = I;
}
v.Dif[I] = 0;
}
switch (NumMinDif)
{
case 1:
if (v.K1 >= -16)
{
v.K1 = v.K1 - 1; // V->K1--;
}
break;
case 2:
if (v.K1 < 16)
{
v.K1 = v.K1 + 1; // V->K1++;
}
break;
case 3:
if (v.K2 >= -16)
{
v.K2 = v.K2 - 1; // V->K2--;
}
break;
case 4:
if (v.K2 < 16)
{
v.K2 = v.K2 + 1; // V->K2++;
}
break;
case 5:
if (v.K3 >= -16)
{
v.K3 = v.K3 - 1;
}
break;
case 6:
if (v.K3 < 16)
{
v.K3 = v.K3 + 1;
}
break;
case 7:
if (v.K4 >= -16)
{
v.K4 = v.K4 - 1;
}
break;
case 8:
if (v.K4 < 16)
{
v.K4 = v.K4 + 1;
}
break;
case 9:
if (v.K5 >= -16)
{
v.K5 = v.K5 - 1;
}
break;
case 10:
if (v.K5 < 16)
{
v.K5 = v.K5 + 1;
}
break;
}
}
return((byte)Ch);
}
