Parse Markers from Audition Session File to Chapter List

audition2chapters.m

- (BOOL)application:(NSApplication*)app openFile:(NSString*)file{

    NSData *data = [[NSData alloc] initWithContentsOfFile:file];
    NSString *query = @"/sesx/session/xmpMetadata";
    NSArray *result = PerformXMLXPathQuery(data, query);
    

    NSString *xmpQuery = @"/x:xmpmeta/rdf:RDF/rdf:Description/xmpDM:Tracks/rdf:Bag/rdf:li/xmpDM:markers/rdf:Seq";
    NSString *xmpMetadataString = [[[[result objectAtIndex:0] objectForKey:@"nodeChildArray"] objectAtIndex:0] objectForKey:@"nodeContent"];
    NSData *xmpMetadataData = [xmpMetadataString dataUsingEncoding:NSUTF8StringEncoding];
    NSArray *xmpResult = PerformXMLXPathQuery(xmpMetadataData, xmpQuery);
    NSArray *markerDict = [[xmpResult objectAtIndex:0] objectForKey:@"nodeChildArray"];
    
    NSString *chapterName = nil;
    NSString *chapterStart = nil;
    
    NSMutableArray *chapters = [[NSMutableArray alloc] init];
    
    for (id chapter in markerDict) {
        NSArray *chapterArray = [chapter objectForKey:@"nodeChildArray"];
        for (id chapterArrayDetail in chapterArray) {
            if ([[chapterArrayDetail objectForKey:@"nodeName"] isEqualToString:@"startTime"]){
                NSString *startTimeString = [chapterArrayDetail objectForKey:@"nodeContent"];
                
                if([startTimeString isEqualToString:@"0"]){
                    chapterStart = @"0";
                }
                else{
                    NSArray *chunks = [startTimeString componentsSeparatedByString:@"f"];
                    chapterStart = [NSString stringWithFormat:@"%f", [[chunks objectAtIndex:0] floatValue] / [[chunks objectAtIndex:1] floatValue] ];
                }
            }
            
            if ([[chapterArrayDetail objectForKey:@"nodeName"] isEqualToString:@"name"]){
                chapterName = [chapterArrayDetail objectForKey:@"nodeContent"];
            }           
        }
    
        NSDictionary * newChapter = [[NSDictionary alloc] initWithObjects:[NSArray arrayWithObjects:chapterStart, chapterName, nil] forKeys:[NSArray arrayWithObjects:@"chapterStart", @"chapterName", nil]];
        [chapters addObject:newChapter];
    }
    

    NSMutableString *chapterText = [[NSMutableString alloc] init];
    
    for (id chapter in chapters) {
        chapterStart = [chapter objectForKey:@"chapterStart"];
        int chapterStartInt = [chapterStart intValue];
        float chapterStartFloat = [chapterStart floatValue];
        int decimals = ( chapterStartFloat - floor(chapterStartFloat) )* 1000;
        
        chapterName = [chapter objectForKey:@"chapterName"];

        [chapterText appendFormat:@"%02u:%02u:%02u.%03u %@\n", chapterStartInt / 3600, (chapterStartInt / 60) % 60, chapterStartInt % 60, decimals, chapterName];
    }
    
    NSError *error = nil;
    [chapterText writeToFile:[[[[file stringByDeletingPathExtension] stringByAppendingString:@"."] stringByAppendingString:@"chapter"] stringByAppendingPathExtension:@"txt"] atomically:YES encoding:NSUTF8StringEncoding error:&error];

    return YES;
}