Question

What’s the easiest way to:

1. load an mp3 from filesystem
2. get a mp3 bitrate metadata
3. mp3 file size
4. play the mp3 on iTunes

with Cocoa ?

I currently have the file path only.

Thanks

Answer 1

For metadata you can use MDItem.

MDItem is a CF-compliant object that represents a file and the
metadata associated with the file.

MDItemRef metadata = MDItemCreate(NULL, (CFStringRef)@"/Users/parag/0.mp3");
NSNumber *audioBitrate = (NSNumber *)MDItemCopyAttribute(metadata, kMDItemAudioBitRate); 
NSLog(@"audioBitrate:%i", [audioBitrate intValue]);

For file size

[[[NSFileManager defaultManager] attributesOfItemAtPath:@"/Users/parag/0.mp3" error:nil] fileSize];  

play the mp3 on iTunes

NSString *cmd = @"open -a /Applications/iTunes.app '/Users/parag/0.mp3'";
system([cmd UTF8String]);