public void init(uint samplingRate, MDSound mds, VGM_PCM_BANK[] PCMBank)
{
this.mds = mds;
this.samplingRate = samplingRate;
pcmStep = samplingRate / (double)DAC_SMPL_RATE;
pcmExecDelta = 0;
this.PCMBank = PCMBank;
refresh();
DacCtrlUsed = 0x00;
for (byte CurChip = 0x00; CurChip < 0xFF; CurChip++)
{
DacCtrl[CurChip] = new DACCTRL_DATA();
DacCtrl[CurChip].Enable = false;
}
}
/**
* PCM_Update(): Update the PCM buffer.
* @param buf PCM buffer.
* @param Length Buffer length.
*/
private int PCM_Update(byte ChipID, int[][] buf, int Length)
{
pcm_chip_ chip = PCM_Chip[ChipID];
int i, j;
int[] bufL, bufR; //, *volL, *volR;
uint Addr, k;
pcm_chan_ CH;
bufL = buf[0];
bufR = buf[1];
// clear buffers
for (int d = 0; d < Length; d++)
{
bufL[d] = 0;
bufR[d] = 0;
}
// if PCM disable, no sound
if (chip.Enable == 0)
{
return(1);
}
// for long update
for (i = 0; i < 8; i++)
{
CH = chip.Channel[i];
// only loop when sounding and on
if (CH.Enable > 0 && CH.Muted == 0)
{
Addr = CH.Addr >> PCM_STEP_SHIFT;
//volL = &(PCM_Volume_Tab[CH->MUL_L << 8]);
//volR = &(PCM_Volume_Tab[CH->MUL_R << 8]);
for (j = 0; j < Length; j++)
{
// test for loop signal
if (chip.RAM[Addr] == 0xFF)
{
CH.Addr = (Addr = CH.Loop_Addr) << PCM_STEP_SHIFT;
if (chip.RAM[Addr] == 0xFF)
{
break;
}
else
{
j--;
}
}
else
{
if ((chip.RAM[Addr] & 0x80) != 0)
{
CH.Data = chip.RAM[Addr] & 0x7F;
bufL[j] -= (int)(CH.Data * CH.MUL_L);
bufR[j] -= (int)(CH.Data * CH.MUL_R);
}
else
{
CH.Data = chip.RAM[Addr];
// this improves the sound of Cosmic Fantasy Stories,
// although it's definately false behaviour
if (CH.Data == 0 && chip.Smpl0Patch != 0)
{
CH.Data = -0x7F;
}
bufL[j] += (int)(CH.Data * CH.MUL_L);
bufR[j] += (int)(CH.Data * CH.MUL_R);
}
bufL[j] = MDSound.Limit(bufL[j], Int16.MaxValue, Int16.MinValue);
bufR[j] = MDSound.Limit(bufR[j], Int16.MaxValue, Int16.MinValue);
// update address register
k = Addr + 1;
CH.Addr = (CH.Addr + CH.Step) & 0x7FFFFFF;
Addr = CH.Addr >> PCM_STEP_SHIFT;
for (; k < Addr; k++)
{
if (chip.RAM[k] == 0xFF)
{
CH.Addr = (Addr = CH.Loop_Addr) << PCM_STEP_SHIFT;
break;
}
}
}
}
if (chip.RAM[Addr] == 0xFF)
{
CH.Addr = CH.Loop_Addr << PCM_STEP_SHIFT;
}
}
}
return(0);
}
public dacControl(uint samplingRate, MDSound mds)
{
init(samplingRate, mds, null);
}
