/// <summary>
/// Attempts to determine the type of the disc.
/// In the future, we might return a struct or a class with more detailed information
/// </summary>
public DiscType DetectDiscType()
{
//check track 1's data type. if it's an audio track, further data-track testing is useless
//furthermore, it's probably senseless (no binary data there to read)
//however a sector could mark itself as audio without actually being.. we'll just wait for that one.
if (dsr.ReadLBA_Mode(disc.TOC.TOCItems[1].LBA) == 0)
{
return(DiscType.AudioDisc);
}
//sega doesnt put anything identifying in the cdfs volume info. but its consistent about putting its own header here in sector 0
if (DetectSegaSaturn())
{
return(DiscType.SegaSaturn);
}
// not fully tested yet
if (DetectMegaCD())
{
return(DiscType.MegaCD);
}
// not fully tested yet
if (DetectPSX())
{
return(DiscType.SonyPSX);
}
//we dont know how to detect TurboCD.
//an emulator frontend will likely just guess TurboCD if the disc is UnknownFormat
//(we can also have a gameDB!)
var discView = EDiscStreamView.DiscStreamView_Mode1_2048;
if (disc.TOC.Session1Format == SessionFormat.Type20_CDXA)
{
discView = EDiscStreamView.DiscStreamView_Mode2_Form1_2048;
}
var iso = new ISOFile();
bool isIso = iso.Parse(new DiscStream(disc, discView, 0));
if (isIso)
{
var appId = System.Text.Encoding.ASCII.GetString(iso.VolumeDescriptors[0].ApplicationIdentifier).TrimEnd('\0', ' ');
//for example: PSX magical drop F (JP SLPS_02337) doesn't have the correct iso PVD fields
//but, some PSX games (junky rips) don't have the 'licensed by string' so we'll hope they get caught here
if (appId == "PLAYSTATION")
{
return(DiscType.SonyPSX);
}
if (appId == "PSP GAME")
{
return(DiscType.SonyPSP);
}
return(DiscType.UnknownCDFS);
}
return(DiscType.UnknownFormat);
}
/// <exception cref="InvalidOperationException">first track of <see cref="TOCRaw"/> is not <c>1</c></exception>
public void Run()
{
var dsr = new DiscSectorReader(IN_Disc)
{
Policy = { DeterministicClearBuffer = false }
};
Result = new DiscStructure();
var session = new DiscStructure.Session();
Result.Sessions.Add(null); //placeholder session for reindexing
Result.Sessions.Add(session);
session.Number = 1;
if (TOCRaw.FirstRecordedTrackNumber != 1)
{
throw new InvalidOperationException($"Unsupported: {nameof(TOCRaw.FirstRecordedTrackNumber)} != 1");
}
//add a lead-in track
session.Tracks.Add(new DiscStructure.Track
{
Number = 0,
Control = EControlQ.None, //we'll set this later
LBA = -new Timestamp(99, 99, 99).Sector //obvious garbage
});
int ntracks = TOCRaw.LastRecordedTrackNumber - TOCRaw.FirstRecordedTrackNumber + 1;
for (int i = 0; i < ntracks; i++)
{
var item = TOCRaw.TOCItems[i + 1];
var track = new DiscStructure.Track
{
Number = i + 1,
Control = item.Control,
LBA = item.LBA
};
session.Tracks.Add(track);
if (!item.IsData)
{
track.Mode = 0;
}
else
{
//determine the mode by a hardcoded heuristic: check mode of first sector
track.Mode = dsr.ReadLBA_Mode(track.LBA);
}
//determine track length according to... how? It isn't clear.
//Let's not do this until it's needed.
//if (i == ntracks - 1)
// track.Length = TOCRaw.LeadoutLBA.Sector - track.LBA;
//else track.Length = (TOCRaw.TOCItems[i + 2].LBATimestamp.Sector - track.LBA);
}
//add lead-out track
session.Tracks.Add(new DiscStructure.Track
{
Number = 0xA0, //right?
//kind of a guess, but not completely
Control = session.Tracks[session.Tracks.Count - 1].Control,
Mode = session.Tracks[session.Tracks.Count - 1].Mode,
LBA = TOCRaw.LeadoutLBA
});
//link track list
for (int i = 0; i < session.Tracks.Count - 1; i++)
{
session.Tracks[i].NextTrack = session.Tracks[i + 1];
}
//fix lead-in track type
//guesses:
session.Tracks[0].Control = session.Tracks[1].Control;
session.Tracks[0].Mode = session.Tracks[1].Mode;
}
public void Run()
{
var dsr = new DiscSectorReader(IN_Disc);
dsr.Policy.DeterministicClearBuffer = false;
Result = new DiscStructure();
var session = new DiscStructure.Session();
Result.Sessions.Add(null); //placeholder session for reindexing
Result.Sessions.Add(session);
session.Number = 1;
if (TOCRaw.FirstRecordedTrackNumber != 1)
throw new InvalidOperationException("Unsupported: FirstRecordedTrackNumber != 1");
//add a lead-in track
session.Tracks.Add(new DiscStructure.Track()
{
Number = 0,
Control = EControlQ.None, //we'll set this later
LBA = -new Timestamp(99,99,99).Sector //obvious garbage
});
int ntracks = TOCRaw.LastRecordedTrackNumber - TOCRaw.FirstRecordedTrackNumber + 1;
for (int i = 0; i < ntracks; i++)
{
var item = TOCRaw.TOCItems[i + 1];
var track = new DiscStructure.Track()
{
Number = i + 1,
Control = item.Control,
LBA = item.LBA
};
session.Tracks.Add(track);
if (!item.IsData)
track.Mode = 0;
else
{
//determine the mode by a hardcoded heuristic: check mode of first sector
track.Mode = dsr.ReadLBA_Mode(track.LBA);
}
//determine track length according to... how? It isn't clear.
//Let's not do this until it's needed.
//if (i == ntracks - 1)
// track.Length = TOCRaw.LeadoutLBA.Sector - track.LBA;
//else track.Length = (TOCRaw.TOCItems[i + 2].LBATimestamp.Sector - track.LBA);
}
//add lead-out track
session.Tracks.Add(new DiscStructure.Track()
{
Number = 0xA0, //right?
//kind of a guess, but not completely
Control = session.Tracks[session.Tracks.Count -1 ].Control,
Mode = session.Tracks[session.Tracks.Count - 1].Mode,
LBA = TOCRaw.LeadoutLBA
});
//link track list
for (int i = 0; i < session.Tracks.Count - 1; i++)
{
session.Tracks[i].NextTrack = session.Tracks[i + 1];
}
//fix lead-in track type
//guesses:
session.Tracks[0].Control = session.Tracks[1].Control;
session.Tracks[0].Mode = session.Tracks[1].Mode;
}
