/// <summary>
/// Reads 12 bytes of subQ data from a sector and stores it unpacked into the provided struct
/// TODO - make use of deserialize code elsewhere
/// </summary>
public void ReadLBA_SubQ(int lba, out SubchannelQ sq)
{
ReadLBA_SubQ(lba, buf12, 0);
sq.q_status = buf12[0];
sq.q_tno.BCDValue = buf12[1];
sq.q_index.BCDValue = buf12[2];
sq.min.BCDValue = buf12[3];
sq.sec.BCDValue = buf12[4];
sq.frame.BCDValue = buf12[5];
sq.zero = buf12[6];
sq.ap_min.BCDValue = buf12[7];
sq.ap_sec.BCDValue = buf12[8];
sq.ap_frame.BCDValue = buf12[9];
//CRC is stored inverted and big endian.. so... do the opposite
byte hibyte = (byte)(~buf12[10]);
byte lobyte = (byte)(~buf12[11]);
sq.q_crc = (ushort)((hibyte << 8) | lobyte);
}
void RunMednaDisc()
{
var disc = new Disc();
OUT_Disc = disc;
//create a MednaDisc and give it to the disc for ownership
var md = new MednaDisc(IN_FromPath);
disc.DisposableResources.Add(md);
//"length of disc" for bizhawk's purposes (NOT a robust concept!) is determined by beginning of leadout track
var m_leadoutTrack = md.TOCTracks[100];
int nSectors = (int)m_leadoutTrack.lba;
//make synth param memos
disc.SynthParams.MednaDisc = md;
//this is the sole sector synthesizer we'll need
var synth = new SS_MednaDisc();
OUT_Disc.SynthProvider = new SimpleSectorSynthProvider()
{
SS = synth
};
//ADR (q-Mode) is necessarily 0x01 for a RawTOCEntry
const int kADR = 1;
const int kUnknownControl = 0;
//mednafen delivers us what is essentially but not exactly (or completely) a TOCRaw.
//we need to synth RawTOCEntries from this and then turn it into a proper TOCRaw
//when coming from mednafen, there are 101 entries.
//entry[0] is placeholder junk, not to be used
//entry[100] is the leadout track (A0)
//A1 and A2 are in the form of FirstRecordedTrackNumber and LastRecordedTrackNumber
for (int i = 1; i < 101; i++)
{
var m_te = md.TOCTracks[i];
//dont add invalid (absent) items
if (!m_te.Valid)
{
continue;
}
var m_ts = new Timestamp((int)m_te.lba + 150); //these are supposed to be absolute timestamps
var q = new SubchannelQ
{
q_status = SubchannelQ.ComputeStatus(kADR, (EControlQ)m_te.control),
q_tno = BCD2.FromDecimal(0), //unknown with mednadisc
q_index = BCD2.FromDecimal(i),
min = BCD2.FromDecimal(0), //unknown with mednadisc
sec = BCD2.FromDecimal(0), //unknown with mednadisc
frame = BCD2.FromDecimal(0), //unknown with mednadisc
zero = 0, //unknown with mednadisc
ap_min = BCD2.FromDecimal(m_ts.MIN),
ap_sec = BCD2.FromDecimal(m_ts.SEC),
ap_frame = BCD2.FromDecimal(m_ts.FRAC),
q_crc = 0 //meaningless
};
//a special fixup: mednafen's entry 100 is the lead-out track, so change it into the A2 raw toc entry
if (i == 100)
{
q.q_index.BCDValue = 0xA2;
}
disc.RawTOCEntries.Add(new RawTOCEntry {
QData = q
});
}
//synth A0 and A1 entries (indicating first and last recorded tracks and also session type)
var qA0 = new SubchannelQ
{
q_status = SubchannelQ.ComputeStatus(kADR, kUnknownControl),
q_tno = BCD2.FromDecimal(0), //unknown with mednadisc
q_index = BCD2.FromBCD(0xA0),
min = BCD2.FromDecimal(0), //unknown with mednadisc
sec = BCD2.FromDecimal(0), //unknown with mednadisc
frame = BCD2.FromDecimal(0), //unknown with mednadisc
zero = 0, //unknown with mednadisc
ap_min = BCD2.FromDecimal(md.TOC.first_track),
ap_sec = BCD2.FromDecimal(md.TOC.disc_type),
ap_frame = BCD2.FromDecimal(0),
q_crc = 0, //meaningless
};
disc.RawTOCEntries.Add(new RawTOCEntry {
QData = qA0
});
var qA1 = new SubchannelQ
{
q_status = SubchannelQ.ComputeStatus(kADR, kUnknownControl),
q_tno = BCD2.FromDecimal(0), //unknown with mednadisc
q_index = BCD2.FromBCD(0xA1),
min = BCD2.FromDecimal(0), //unknown with mednadisc
sec = BCD2.FromDecimal(0), //unknown with mednadisc
frame = BCD2.FromDecimal(0), //unknown with mednadisc
zero = 0, //unknown with mednadisc
ap_min = BCD2.FromDecimal(md.TOC.last_track),
ap_sec = BCD2.FromDecimal(0),
ap_frame = BCD2.FromDecimal(0),
q_crc = 0, //meaningless
};
disc.RawTOCEntries.Add(new RawTOCEntry {
QData = qA1
});
}
