/// <summary>
/// Gets the id for this disc based on the total length of all tracks
/// </summary>
/// <returns>The disc id as an unsigned long integer</returns>
/// <remarks>For backward compatibility this algorithm must not change.
/// This algorithm is based on the freedb.org reference at www.freedb.org/....
/// </remarks>
public static ulong GetDiscId(CDTableOfContents toc)
{
int numberOfTracks = toc.NumberOfTracks -1;
int index = 0;
ulong offset = 0, sum = 0;
//int other = 0xff; // = 255
for(index = 0; index < toc.NumberOfTracks; index++)
{
sum = sum + GetTocSum(Convert.ToUInt64((toc.Minutes[index] * 60) + toc.Seconds[index]));
}
offset =
Convert.ToUInt64(
((toc.Minutes[numberOfTracks] * 60) + toc.Seconds[numberOfTracks]) -
((toc.Minutes[0] * 60) + toc.Seconds[0])
);
return Convert.ToUInt64( ((sum % 0xff) << 24) | (offset << 8) | Convert.ToUInt64(toc.NumberOfTracks) );
//return (ulong)( ((sum % 0xFF) << 24) | (offset << 8) | ((ulong)toc.NumberOfTracks) );
}
public Disc(CDTableOfContents toc)
{
this.toc = toc;
this.id = Disc.GetDiscId(toc);
}
