private void CDRead(int lba, IntPtr dest, bool audio)
{
if (audio)
{
byte[] data = new byte[2352];
if (lba < _cd.Session1.LeadoutLBA && lba >= _cd.Session1.Tracks[2].LBA)
{
_cdReader.ReadLBA_2352(lba, data, 0);
}
Marshal.Copy(data, 0, dest, 2352);
}
else
{
byte[] data = new byte[2048];
_cdReader.ReadLBA_2048(lba, data, 0);
Marshal.Copy(data, 0, dest, 2048);
DriveLightOn = true;
}
}
public void Think()
{
if (RST)
{
ResetDevice();
return;
}
if (DataReadInProgress && pce.Cpu.TotalExecutedCycles > DataReadWaitTimer)
{
if (SectorsLeftToRead > 0)
{
pce.DriveLightOn = true;
}
if (DataIn.Count == 0)
{
// read in a sector and shove it in the queue
DiscSystem.DiscSectorReader dsr = new DiscSectorReader(disc); //TODO - cache reader
dsr.ReadLBA_2048(CurrentReadingSector, DataIn.GetBuffer(), 0);
DataIn.SignalBufferFilled(2048);
CurrentReadingSector++;
SectorsLeftToRead--;
pce.IntDataTransferReady = true;
// If more sectors, should set the next think-clock to however long it takes to read 1 sector
// but I dont. I dont think transfers actually happen sector by sector
// like this, they probably become available as the bits come off the disc.
// but lets get some basic functionality before we go crazy.
// Idunno, maybe they do come in a sector at a time.
//note to vecna: maybe not at the sector level, but at a level > 1 sample and <= 1 sector, samples come out in blocks
//due to the way they are jumbled up (seriously, like put into a blender) for error correction purposes.
//we may as well assume that the cd audio decoding magic works at the level of one sector, but it isnt one sample.
if (SectorsLeftToRead == 0)
{
DataReadInProgress = false;
DataTransferWasDone = true;
}
SetPhase(BusPhase_DataIn);
}
}
do
{
signalsChanged = false;
busPhaseChanged = false;
if (SEL && !BSY)
{
SetPhase(BusPhase_Command);
}
else if (ATN && !REQ && !ACK)
{
SetPhase(BusPhase_MessageOut);
}
else
{
switch (Phase)
{
case BusPhase_Command: ThinkCommandPhase(); break;
case BusPhase_DataIn: ThinkDataInPhase(); break;
case BusPhase_DataOut: ThinkDataOutPhase(); break;
case BusPhase_MessageIn: ThinkMessageInPhase(); break;
case BusPhase_MessageOut: ThinkMessageOutPhase(); break;
case BusPhase_Status: ThinkStatusPhase(); break;
default: break;
}
}
} while (signalsChanged || busPhaseChanged);
}