Example of uploading a track to the Echo Nest for analysis without ENIOS

TrackUploadSample.m

- (void) uploadTrack: (Track *)  track {
    
    NSDictionary *params = @{
                             @"filetype" : @"m4a",
                             @"api_key" : self.apiKey,
                             };
    NSFileManager *fm = [NSFileManager defaultManager];
    NSURL *audioPath = [self pathToAudio:track];
    NSString *path = [audioPath path];
    NSData *data = [fm contentsAtPath:path];
    
    AFHTTPClient *client= [AFHTTPClient clientWithBaseURL:[NSURL URLWithString:@"http://developer.echonest.com/api/v4/"]];
    
    NSURLRequest *request = [client multipartFormRequestWithMethod:@"POST" path: @"track/upload"
                            parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
                            [formData appendPartWithFileData:data name:@"track" 
                            fileName:[path lastPathComponent] mimeType:@"multipart/form-data"];
                                                        }];
    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request 
            success:^(NSURLRequest *request, NSHTTPURLResponse *response, id json) {
        NSLog(@"done");
        NSLog(@"response: %@", json);
        NSString *trackID = json[@"response"][@"track"][@"id"];
        NSLog(@"Track ID is %@", trackID);
        track.trackID = trackID;
        
        [track asyncUpdateState:STATE_UPLOADED];
        [track asyncUpdateStatus:STATUS_OK];
        
    } failure:^(NSURLRequest *request , NSURLResponse *response , NSError *error , id json) {
        [track asyncUpdateDetails:@"upload error"];
        [track asyncUpdateStatus:STATUS_NON_FATAL_ERROR];
    }];
    
    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        int progress = rint(totalBytesWritten * 100.0 / (float) totalBytesExpectedToWrite);
        NSLog(@"Upload progress %d", progress);
        
        if (progress > 99) {
            progress = -50;
            [track asyncUpdateDetails:@"Queueing for analysis"];
        }
        
        [track asyncUpdateProgress:progress];
    }];
    
    [track asyncUpdateDetails:@"Uploading to The Echo Nest"];
    [operation start];
}