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Calculate and use track pregaps.

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This commit is contained in:
Natalia Portillo
2020-01-01 21:50:49 +00:00
parent 727afd3e79
commit 912ab555fb
2 changed files with 115 additions and 1 deletions
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112
DiscImageChef.Core/Devices/Dumping/CompactDisc/Pregap.cs
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@@ -34,6 +34,7 @@ using System;
using System.Collections.Generic;
using System.IO;
using DiscImageChef.CommonTypes.Enums;
using DiscImageChef.CommonTypes.Structs;
using DiscImageChef.Devices;
// ReSharper disable JoinDeclarationAndInitializer
@@ -116,5 +117,116 @@ namespace DiscImageChef.Core.Devices.Dumping
firstTrackPregapMs.Close();
}
void SolveTrackPregaps(Track[] tracks, bool supportsPqSubchannel, bool supportsRwSubchannel)
{
bool sense; // Sense indicator
byte[] cmdBuf; // Data buffer
if(!supportsPqSubchannel &&
!supportsRwSubchannel)
return;
for(int i = 1; i < tracks.Length; i++)
{
uint lba = (uint)tracks[i].TrackStartSector - 150;
int trackPregap = 0;
bool previousSense = false;
while(lba > tracks[i - 1].TrackStartSector)
{
if(supportsPqSubchannel)
sense = _dev.ReadCd(out cmdBuf, out _, lba, 16, 1, MmcSectorTypes.AllTypes, false, false, false,
MmcHeaderCodes.None, false, false, MmcErrorField.None, MmcSubchannel.Q16,
_dev.Timeout, out _);
else
{
sense = _dev.ReadCd(out cmdBuf, out _, lba, 16, 1, MmcSectorTypes.AllTypes, false, false, false,
MmcHeaderCodes.None, false, false, MmcErrorField.None, MmcSubchannel.Q16,
_dev.Timeout, out _);
sense = _dev.ReadCd(out cmdBuf, out _, lba, 96, 1, MmcSectorTypes.AllTypes, false, false, false,
MmcHeaderCodes.None, false, false, MmcErrorField.None, MmcSubchannel.Raw,
_dev.Timeout, out _);
if(!sense)
{
int[] q = new int[cmdBuf.Length / 8];
// De-interlace Q subchannel
for(int iq = 0; iq < cmdBuf.Length; iq += 8)
{
q[iq / 8] = (cmdBuf[iq] & 0x40) << 1;
q[iq / 8] += cmdBuf[iq + 1] & 0x40;
q[iq / 8] += (cmdBuf[iq + 2] & 0x40) >> 1;
q[iq / 8] += (cmdBuf[iq + 3] & 0x40) >> 2;
q[iq / 8] += (cmdBuf[iq + 4] & 0x40) >> 3;
q[iq / 8] += (cmdBuf[iq + 5] & 0x40) >> 4;
q[iq / 8] += (cmdBuf[iq + 6] & 0x40) >> 5;
q[iq / 8] += (cmdBuf[iq + 7] & 0x40) >> 6;
}
cmdBuf = new byte[q.Length];
for(int iq = 0; iq < cmdBuf.Length; iq++)
{
cmdBuf[iq] = (byte)q[iq];
}
cmdBuf[1] = (byte)(((cmdBuf[1] / 16) * 10) + (cmdBuf[1] & 0x0F));
cmdBuf[2] = (byte)(((cmdBuf[2] / 16) * 10) + (cmdBuf[2] & 0x0F));
cmdBuf[3] = (byte)(((cmdBuf[3] / 16) * 10) + (cmdBuf[3] & 0x0F));
cmdBuf[4] = (byte)(((cmdBuf[4] / 16) * 10) + (cmdBuf[4] & 0x0F));
cmdBuf[5] = (byte)(((cmdBuf[5] / 16) * 10) + (cmdBuf[5] & 0x0F));
cmdBuf[6] = (byte)(((cmdBuf[6] / 16) * 10) + (cmdBuf[6] & 0x0F));
cmdBuf[7] = (byte)(((cmdBuf[7] / 16) * 10) + (cmdBuf[7] & 0x0F));
cmdBuf[8] = (byte)(((cmdBuf[8] / 16) * 10) + (cmdBuf[8] & 0x0F));
cmdBuf[9] = (byte)(((cmdBuf[9] / 16) * 10) + (cmdBuf[9] & 0x0F));
}
}
if(!sense)
{
// Q position
if((cmdBuf[0] & 0xF) != 1)
continue;
if(cmdBuf[1] != tracks[i].TrackSequence ||
cmdBuf[2] != 0)
{
lba++;
trackPregap = (int)(tracks[i].TrackStartSector - lba);
if(previousSense)
break;
continue;
}
int pregapQ = (cmdBuf[3] * 60 * 75) + (cmdBuf[4] * 75) + cmdBuf[5];
if(pregapQ > trackPregap)
trackPregap = pregapQ;
else
break;
lba--;
}
else
{
previousSense = true;
lba--;
}
}
#if DEBUG
_dumpLog.WriteLine($"Track {tracks[i].TrackSequence} pregap is {trackPregap} sectors");
UpdateStatus?.Invoke($"Track {tracks[i].TrackSequence} pregap is {trackPregap} sectors");
#endif
tracks[i].TrackPregap = (ulong)trackPregap;
tracks[i].TrackStartSector -= tracks[i].TrackPregap;
}
}
}
}