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Calculate offset on discs where an audio track follows a data track.

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This commit is contained in:
Natalia Portillo
2020-01-02 20:13:47 +00:00
parent 697649ed53
commit 26b9f44269
1 changed files with 75 additions and 0 deletions
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75
DiscImageChef.Core/Media/Info/CompactDisc.cs
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@@ -149,6 +149,81 @@ namespace DiscImageChef.Core.Media.Info
}
}
// Try to get another the offset some other way, we need an audio track just after a data track, same session
if(!offsetFound)
{
Track dataTrack = default;
Track audioTrack = default;
for(int i = 1; i < tracks.Length; i++)
{
if(tracks[i - 1].TrackType == TrackType.Audio ||
tracks[i].TrackType != TrackType.Audio)
continue;
dataTrack = tracks[i - 1];
audioTrack = tracks[i];
break;
}
// Found them
if(dataTrack.TrackSequence != 0 &&
audioTrack.TrackSequence != 0)
{
sense = dev.ReadCd(out cmdBuf, out _, (uint)audioTrack.TrackStartSector, sectorSize, 3,
MmcSectorTypes.Cdda, false, false, false, MmcHeaderCodes.None, true, false,
MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);
if(!sense &&
!dev.Error)
{
dataTrack.TrackEndSector += 150;
// Calculate MSF
ulong minute = dataTrack.TrackEndSector / 4500;
ulong second = (dataTrack.TrackEndSector - (minute * 4500)) / 75;
ulong frame = dataTrack.TrackEndSector - (minute * 4500) - (second * 75);
dataTrack.TrackEndSector -= 150;
// Convert to BCD
ulong remainder = minute % 10;
minute = ((minute / 10) * 16) + remainder;
remainder = second % 10;
second = ((second / 10) * 16) + remainder;
remainder = frame % 10;
frame = ((frame / 10) * 16) + remainder;
// Scramble M and S
minute ^= 0x01;
second ^= 0x80;
// Build sync
byte[] sectorSync =
{
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, (byte)minute,
(byte)second, (byte)frame
};
byte[] tmpBuf = new byte[sectorSync.Length];
for(int i = 0; i < cmdBuf.Length - sectorSync.Length; i++)
{
Array.Copy(cmdBuf, i, tmpBuf, 0, sectorSync.Length);
if(!tmpBuf.SequenceEqual(sectorSync))
continue;
offsetBytes = i + 2352;
offsetFound = true;
break;
}
}
}
}
if(cdOffset is null)
{
if(offsetFound)