[itistoday]

ok, I give up, can someone out there point me in the direction of a good id3 library that has good documentation and will work with objective-c? I think that any C library should do fine, but not C++.

[seb2]

what about your other post? didn't the id3lib from sourcefourge work?

for me, this would just be overkill, i just want to be able to get some basic id3 tags out of an mp3. i had a look at the specifications yesterday; id3v1 is a 5 minute 10 liner, but id3v2 looks a bit more complicated.

i haven't yet tackled it, so i don't know how hard this really is, but why re-invent the wheel?

itistoday, have you found anything?

[itistoday]

well seb2, the problem is, is that I can't find any good documentation for that library. How did you figure yours out? Just looked over the files? I did fine some, but it was for C++, and I don't think you can mix C++ with Obj-C, but you can mix C with Obj-C. They say the library works with C too, but I can't figure out how. Maybe you can help me out. So far, I haven't found any other library's, but now that the weekend has come, I'll keep looking.

[seb2]

you can mix obj-c and c++... http://developer.apple.com/techpubs/...tes/Objective-
C++.html

id3v1 was so simple, i did this before looking at the id3lib. give me until tonight (have to get going now), i can post those few lines for id3v1, no big deal.

my problem with id3v2 is that i think the id3lib would just be overkill for my plans; i don't need to be able to edit tags, just want the artist and song title out of an mp3, that's all... guess i'll have to take a closer look at those libs. (as far as i'm concerned, i find it much harder to understand other people's code than to write my own...)

[seb2]

ok, this is my first approach... might look a bit complicated when it comes to the encoding, but just using [NSString stringWithCString:[[fiHa readDataOfLength:30] bytes]] makes umlauts in my german mp3s unusable, this approach tweaks with the encoding a bit and actually works:

<BLOCKQUOTE><font size="1"face="Geneva, Verdana, Arial">code:</font><HR><pre><font size=1 face=courier>
#import &lt;string.h&gt;

...

- (void)getID3v1TagFromFileAtPath NSString *)path
{
NSString *tag, *title, *artist, *album;

NSData *data;

NSFileHandle *fiHa = [NSFileHandle fileHandleForReadingAtPath ath];

[fiHa seekToFileOffset [[[[NSFileManager defaultManager] fileAttributesAtPath ath traverseLink:NO] objectForKey:NSFileSize] intValue] - <font color = blue>128</font>)];

tag = [[[NSString alloc] initWithData:[fiHa readDataOfLength:<font color = blue>3</font>] encoding:NSASCIIStringEncoding] autorelease];

if ([[tag lowercaseString] isEqualToString:<font color = orange>@"tag"</font>])
{
data = [fiHa readDataOfLength:<font color = blue>30</font>];
title = [[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] autorelease];
title = [title substringWithRange:NSMakeRange(<font color = blue>0</font>, strlen([data bytes]))];

data = [fiHa readDataOfLength:<font color = blue>30</font>];
artist = [[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] autorelease];
artist = [artist substringWithRange:NSMakeRange(<font color = blue>0</font>, strlen([data bytes]))];

data = [fiHa readDataOfLength:<font color = blue>30</font>];
album = [[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] autorelease];
album = [album substringWithRange:NSMakeRange(<font color = blue>0</font>, strlen([data bytes]))];

NSLog(<font color = orange>@"Title: \<font color = red>"</font>%@\"</font>", title);
NSLog(<font color = orange>@"Artist: \<font color = red>"</font>%@\"</font>", artist);
NSLog(<font color = orange>@"Album: \<font color = red>"</font>%@\"</font>", album);
} else {
NSLog(<font color = orange>@"No valid ID3v1 tag"</font>);
}
}
</font>[/code]

it doesn't check whether the path actually exists, it's assumed it does.

any useful info on id3v2?

[itistoday]

Well, try reading this documentation. It's for C++ though, and I don't know C++. Maybe it'll help you figure out id3v2. Btw, the documentation is for id3lib.

[seb2]

Originally posted by itistoday:
<STRONG>Well, try reading this documentation. It's for C++ though, and I don't know C++. Maybe it'll help you figure out id3v2. Btw, the documentation is for id3lib.</STRONG>

thanks, but this id3lib is kind of huge. -- i thought more about something the third of the size, if that's feasable...

i'll keep on trying. i've made some first steps to do id3v2 parsing myself. far from being done, but further away from zero than before.