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cue pregap subQ

This commit is contained in:
zeromus 2015-07-01 05:41:56 -05:00
parent 5bb7d5e707
commit 9b5daa9e3c
1 changed files with 35 additions and 37 deletions
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72
BizHawk.Emulation.DiscSystem/CUE/CUE_Load.cs
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@ -201,28 +201,37 @@ namespace BizHawk.Emulation.DiscSystem
//per "Example 05" on digitalx.org, pregap can come from index specification and pregap command
int specifiedPregapLength = cct.PregapLength.Sector;
int impliedPregapLength = cct.Indexes[1].FileMSF.Sector - cct.Indexes[0].FileMSF.Sector;
//total pregap is needed for subQ addressing of the entire pregap area (pregap + distinct index0)
//during generating userdata sectors this is already handled
//we just need to know the difference for when we generate a better subQ here
int totalPregapLength = specifiedPregapLength + impliedPregapLength;
//from now on we'll track relative timestamp and increment it continually
int relMSF = -totalPregapLength;
//read more at policies declaration
if (!context.DiscMountPolicy.CUE_PauseContradictionModeA)
relMSF += 1;
for (int s = 0; s < specifiedPregapLength; s++)
{
//TODO - do a better job synthesizing Q
var se_pregap = new SectorEntry(null);
var ss_pregap = new SS_Gap();
//pregaps set pause flag
//TODO - do a better job synthesizing P
ss_pregap.Pause = true;
var se = new SectorEntry(null);
var ss = new SS_Gap();
se_pregap.SectorSynth = ss_pregap;
OUT_Disc.Sectors.Add(se_pregap);
//-subq-
byte ADR = 1;
ss.sq.SetStatus(ADR, (EControlQ)(int)cct.Flags);
ss.sq.q_tno = BCD2.FromDecimal(cct.Number);
ss.sq.q_index = BCD2.FromDecimal(0);
ss.sq.AP_Timestamp = new Timestamp(OUT_Disc.Sectors.Count);
ss.sq.Timestamp = new Timestamp(relMSF);
//-subP-
//always paused--is this good enough? (probably not, theres detailed handling commented out at the end of this file)
ss.Pause = true;
se.SectorSynth = ss;
OUT_Disc.Sectors.Add(se);
relMSF++;
}
//TODO - build track relative timestamp now and increment it continually
//after this, pregap sectors are generated like a normal sector, but the subQ is specified as a pregap instead of a normal track (actually, TBD)
//---------------------------------
@ -257,6 +266,12 @@ namespace BizHawk.Emulation.DiscSystem
//WE ARE NOW AT INDEX 1: generate the RawTOCEntry for this track
EmitRawTOCEntry(cct);
}
//in the weird mednafen mode, we need to adjust relMSF to be 0 since we pre-adjusted it once
if (!context.DiscMountPolicy.CUE_PauseContradictionModeA && relMSF == 1)
relMSF = 0;
else
if (relMSF != 0) throw new InvalidOperationException();
}
else break;
}
@ -277,28 +292,13 @@ namespace BizHawk.Emulation.DiscSystem
break;
}
//prepare fields for subQ
int track_relative_msf = curr_blobMSF - cct.Indexes[1].FileMSF.Sector;
//for index 0, negative MSF required and encoded oppositely. Read more at Policies declaration
if (curr_index == 0)
{
if (!context.DiscMountPolicy.CUE_PauseContradictionModeA)
track_relative_msf += 1;
if (track_relative_msf > 0) throw new InvalidOperationException("Severe error generating cue subQ (positive relMSF for pregap)");
track_relative_msf = -track_relative_msf;
}
else
if (track_relative_msf < 0) throw new InvalidOperationException("Severe error generating cue subQ (negative relMSF for non-pregap)");
//setup subQ
byte ADR = 1; //absent some kind of policy for how to set it, this is a safe assumption:
ss.sq.SetStatus(ADR, (EControlQ)(int)cct.Flags);
ss.sq.q_tno = BCD2.FromDecimal(cct.Number);
ss.sq.q_index = BCD2.FromDecimal(curr_index);
ss.sq.AP_Timestamp = new Timestamp(OUT_Disc.Sectors.Count);
ss.sq.Timestamp = new Timestamp(track_relative_msf);
ss.sq.Timestamp = new Timestamp(relMSF);
//setup subP
if (curr_index == 0)
@ -309,6 +309,7 @@ namespace BizHawk.Emulation.DiscSystem
se.SectorSynth = ss;
OUT_Disc.Sectors.Add(se);
curr_blobMSF++;
relMSF++;
if (cct.IsFinalInFile)
{
@ -333,20 +334,16 @@ namespace BizHawk.Emulation.DiscSystem
int specifiedPostgapLength = cct.PostgapLength.Sector;
for (int s = 0; s < specifiedPostgapLength; s++)
{
//TODO - do a better job synthesizing Q
var se= new SectorEntry(null);
var ss = new SS_Gap();
//-subq-
//postgap addressing continues from
int lastSectorRelMSF = curr_blobMSF - cct.Indexes[1].FileMSF.Sector - 1;
int postgapSectorRelMSF = lastSectorRelMSF + s + 1;
byte ADR = 1;
ss.sq.SetStatus(ADR, (EControlQ)(int)cct.Flags);
ss.sq.q_tno = BCD2.FromDecimal(cct.Number);
ss.sq.q_index = BCD2.FromDecimal(curr_index);
ss.sq.AP_Timestamp = new Timestamp(OUT_Disc.Sectors.Count);
ss.sq.Timestamp = new Timestamp(postgapSectorRelMSF);
ss.sq.Timestamp = new Timestamp(relMSF);
//-subP-
//always paused--is this good enough?
@ -354,6 +351,7 @@ namespace BizHawk.Emulation.DiscSystem
se.SectorSynth = ss;
OUT_Disc.Sectors.Add(se);
relMSF++;
}