/// <summary>Decodes the disc informations sent by the CDDB server</summary>
/// <param name="line">Line containing the disc informations</param>
/// <param name="startIndex">
/// Characer Index at which the disc informations begin
/// </param>
/// <returns>The decoded CDDB disc informations</returns>
private Cddb.Disc decodeDisc(string line, int startIndex) {
// Locate where in the string the current protocol level starts
int categoryEndIndex = -1;
bool hasCategory =
(line.Length >= startIndex) &&
((categoryEndIndex = line.IndexOf(SP, startIndex)) != -1);
if(!hasCategory) {
throw makeBadResponseException("missing category name in query result");
}
// Locate where in the string the current protocol level starts
int discIdEndIndex = -1;
bool hasDiscId =
(line.Length >= categoryEndIndex + 1) &&
((discIdEndIndex = line.IndexOf(SP, categoryEndIndex + 1)) != -1);
if(!hasDiscId) {
throw makeBadResponseException("missing disc id in query result");
}
bool hasDiscTitle =
(line.Length >= discIdEndIndex + 1) &&
(line[discIdEndIndex] == SP);
if(!hasDiscTitle) {
throw makeBadResponseException("missing disc title in query result");
}
string discId = line.Substring(
categoryEndIndex + 1, discIdEndIndex - categoryEndIndex - 1
);
Cddb.DTitle artistAndAlbum = Cddb.SplitDiscTitle(
line.Substring(discIdEndIndex + 1)
);
return new Cddb.Disc(
line.Substring(startIndex, categoryEndIndex - startIndex),
Convert.ToInt32(discId, 16),
artistAndAlbum.Artist,
artistAndAlbum.Title
);
}
/// <summary>
/// Queries the AccurateRip database for the CRCs of the tracks on the specified CD
/// </summary>
/// <param name="totalLengthSeconds">
/// Total length of the CD (from the beginning of the first track to the end of the
/// last track) in seconds
/// </param>
/// <param name="trackOffsetsSeconds">
/// Offsets of the individual tracks on the CD in seconds
/// </param>
/// <returns></returns>
public static Request <CdInfo[]> QueryDatabase(
int totalLengthSeconds, int[] trackOffsetsSeconds
)
{
try {
// Calculate the three IDs required by a query to the AccurateRip database. AccurateRip
// improves (marginally) on the flawed CDDB disc id by providing two additional ids,
// however, this doesn't hurt AccurateRip nearly as much as it would a CDDB service.
int discId1 = CalculateDiscId1(trackOffsetsSeconds);
int discId2 = CalculateDiscId2(trackOffsetsSeconds);
int cddbDiscId = Cddb.CalculateDiscId(totalLengthSeconds, trackOffsetsSeconds);
int trackCount = trackOffsetsSeconds.Length;
return(QueryDatabase(discId1, discId2, cddbDiscId, trackCount));
}
catch (Exception exception) {
return(Request <CdInfo[]> .CreateFailedDummy(exception));
}
}
/// <summary>Sends the query to the CDDB server</summary>
private void sendQuery() {
StringBuilder builder = new StringBuilder(192);
// Build the initial query string consisting of the command, CDDB disc id
// and the number of tracks on the CD
builder.AppendFormat(
"cddb query {0:x8} {1} ",
Cddb.CalculateDiscId(this.discLengthSeconds, this.trackOffsetsSeconds),
this.trackOffsetsSeconds.Length
);
// Append the start offsets
for(int index = 0; index < this.trackOffsetsSeconds.Length; ++index) {
builder.AppendFormat("{0} ", this.trackOffsetsSeconds[index] * 75);
}
builder.Append(this.discLengthSeconds);
this.protocol.SendLine(builder.ToString(), 5000);
}