public void Synth(SectorSynthJob job)
{
//be lazy, just generate the whole sector unconditionally
//this is mostly based on mednafen's approach, which was probably finely tailored for PSX
//heres the comments on the subject:
// I'm not trusting that the "control" field for the TOC leadout entry will always be set properly, so | the control fields for the last track entry
// and the leadout entry together before extracting the D2 bit. Audio track->data leadout is fairly benign though maybe noisy(especially if we ever implement
// data scrambling properly), but data track->audio leadout could break things in an insidious manner for the more accurate drive emulation code).
var ses = job.Disc.Structure.Sessions[SessionNumber];
int lba_relative = job.LBA - ses.LeadoutTrack.LBA;
//data is zero
int ts = lba_relative;
int ats = job.LBA;
const int ADR = 0x1; // Q channel data encodes position
EControlQ control = ses.LeadoutTrack.Control;
//ehhh? CDI?
//if(toc.tracks[toc.last_track].valid)
// control |= toc.tracks[toc.last_track].control & 0x4;
//else if(toc.disc_type == DISC_TYPE_CD_I)
// control |= 0x4;
control |= (EControlQ)(((int)ses.LastInformationTrack.Control) & 4);
SubchannelQ sq = new SubchannelQ();
sq.SetStatus(ADR, control);
sq.q_tno.BCDValue = 0xAA;
sq.q_index.BCDValue = 0x01;
sq.Timestamp = ts;
sq.AP_Timestamp = ats;
sq.zero = 0;
//finally, rely on a gap sector to do the heavy lifting to synthesize this
CUE.CueTrackType TrackType = CUE.CueTrackType.Audio;
if (ses.LeadoutTrack.IsData)
{
if (job.Disc.TOC.Session1Format == SessionFormat.Type20_CDXA || job.Disc.TOC.Session1Format == SessionFormat.Type10_CDI)
{
TrackType = CUE.CueTrackType.Mode2_2352;
}
else
{
TrackType = CUE.CueTrackType.Mode1_2352;
}
}
CUE.SS_Gap ss_gap = new CUE.SS_Gap()
{
Policy = Policy,
sq = sq,
TrackType = TrackType,
Pause = true //?
};
ss_gap.Synth(job);
}
public void Run()
{
//TODO: encode_mode2_form2_sector
var leadoutTs = Disc.TOC.LeadoutLBA;
var lastTrackTOCItem = Disc.TOC.TOCItems[Disc.TOC.LastRecordedTrackNumber]; //NOTE: in case LastRecordedTrackNumber is al ie, this will malfunction
//leadout flags.. let's set them the same as the last track.
//THIS IS NOT EXACTLY THE SAME WAY MEDNAFEN DOES IT
EControlQ leadoutFlags = lastTrackTOCItem.Control;
//TODO - needs to be encoded as a certain mode (mode 2 form 2 for psx... i guess...)
for (int i = 0; i < Length; i++)
{
//var se = new SectorEntry(sz);
//Disc.Sectors.Add(se);
SubchannelQ sq = new SubchannelQ();
int track_relative_msf = i;
sq.min = BCD2.FromDecimal(new Timestamp(track_relative_msf).MIN);
sq.sec = BCD2.FromDecimal(new Timestamp(track_relative_msf).SEC);
sq.frame = BCD2.FromDecimal(new Timestamp(track_relative_msf).FRAC);
int absolute_msf = i + leadoutTs;
sq.ap_min = BCD2.FromDecimal(new Timestamp(absolute_msf + 150).MIN);
sq.ap_sec = BCD2.FromDecimal(new Timestamp(absolute_msf + 150).SEC);
sq.ap_frame = BCD2.FromDecimal(new Timestamp(absolute_msf + 150).FRAC);
sq.q_tno.DecimalValue = 0xAA; //special value for leadout
sq.q_index.DecimalValue = 1;
byte ADR = 1;
sq.SetStatus(ADR, leadoutFlags);
//TODO - actually stash the subQ
}
}
/// <summary>
/// computes a status byte from the provided adr/qmode and control values
/// </summary>
public static byte ComputeStatus(int adr_or_qmode, EControlQ control)
{
return((byte)(adr_or_qmode | (((int)control) << 4)));
}
/// <summary>
/// sets the status byte from the provided adr/qmode and control values
/// </summary>
public void SetStatus(byte adr_or_qmode, EControlQ control)
{
q_status = ComputeStatus(adr_or_qmode, control);
}
/// <summary>
/// sets the status byte from the provided adr and control values
/// </summary>
public void SetStatus(byte adr, EControlQ control)
{
q_status = ComputeStatus(adr, control);
}
/// <summary>
/// computes a status byte from the provided adr and control values
/// </summary>
public static byte ComputeStatus(int adr, EControlQ control)
{
return (byte)(adr | (((int)control) << 4));
}
/// <summary>
/// sets the status byte from the provided adr and control values
/// </summary>
public void SetStatus(byte adr, EControlQ control)
{
q_status = ComputeStatus(adr, control);
}
/// <summary>
/// Creates the subcode (really, just subchannel Q) for this disc from its current TOC.
/// Depends on the TOCPoints existing in the structure
/// TODO - do we need a fully 0xFF P-subchannel for PSX?
/// </summary>
void Synthesize_SubcodeFromStructure()
{
int aba = 0;
int dpIndex = 0;
//TODO - from mednafen (on PC-FX chip chan kick)
//If we're more than 2 seconds(150 sectors) from the real "start" of the track/INDEX 01, and the track is a data track,
//and the preceding track is an audio track, encode it as audio(by taking the SubQ control field from the preceding
//NOTE: discs may have subcode which is nonsense or possibly not recoverable from a sensible disc structure.
//but this function does what it says.
//SO: heres the main idea of how this works.
//we have the Structure.Points (whose name we dont like) which is a list of sectors where the tno/index changes.
//So for each sector, we see if we've advanced to the next point.
//TODO - check if this is synthesized correctly when producing a structure from a TOCRaw
while (aba < Sectors.Count)
{
if (dpIndex < Structure.Points.Count - 1)
{
while (aba >= Structure.Points[dpIndex + 1].ABA)
{
dpIndex++;
}
}
var dp = Structure.Points[dpIndex];
var se = Sectors[aba];
EControlQ control = dp.Control;
bool pause = true;
if (dp.Num != 0) //TODO - shouldnt this be IndexNum?
{
pause = false;
}
if ((dp.Control & EControlQ.DataUninterrupted) != 0)
{
pause = false;
}
int adr = dp.ADR;
SubchannelQ sq = new SubchannelQ();
sq.q_status = SubchannelQ.ComputeStatus(adr, control);
sq.q_tno = BCD2.FromDecimal(dp.TrackNum).BCDValue;
sq.q_index = BCD2.FromDecimal(dp.IndexNum).BCDValue;
int track_relative_aba = aba - dp.Track.Indexes[1].aba;
track_relative_aba = Math.Abs(track_relative_aba);
Timestamp track_relative_timestamp = new Timestamp(track_relative_aba);
sq.min = BCD2.FromDecimal(track_relative_timestamp.MIN);
sq.sec = BCD2.FromDecimal(track_relative_timestamp.SEC);
sq.frame = BCD2.FromDecimal(track_relative_timestamp.FRAC);
sq.zero = 0;
Timestamp absolute_timestamp = new Timestamp(aba);
sq.ap_min = BCD2.FromDecimal(absolute_timestamp.MIN);
sq.ap_sec = BCD2.FromDecimal(absolute_timestamp.SEC);
sq.ap_frame = BCD2.FromDecimal(absolute_timestamp.FRAC);
var bss = new BufferedSubcodeSector();
bss.Synthesize_SubchannelQ(ref sq, true);
//TEST: need this for psx?
if (pause)
{
bss.Synthesize_SubchannelP(true);
}
se.SubcodeSector = bss;
aba++;
}
}
/// <summary>
/// sets the status byte from the provided adr/qmode and control values
/// </summary>
public void SetStatus(byte adr_or_qmode, EControlQ control)
{
q_status = ComputeStatus(adr_or_qmode, control);
}