How to get the album art of mp3 file - iphone

Question

i am developing an audio player. I successfully get other information of the mp3 file. but is unable to get the album art of the mp3 file. using this code i get the mp3 file info.
- (NSDictionary *)songID3Tags
{
AudioFileID fileID = nil;
OSStatus error = noErr;
error = AudioFileOpenURL((CFURLRef)self.filePath, kAudioFileReadPermission, 0, &fileID);
if (error != noErr) {
NSLog(#"AudioFileOpenURL failed");
}
UInt32 id3DataSize = 0;
char *rawID3Tag = NULL;
error = AudioFileGetPropertyInfo(fileID, kAudioFilePropertyID3Tag, &id3DataSize, NULL);
if (error != noErr)
NSLog(#"AudioFileGetPropertyInfo failed for ID3 tag");
rawID3Tag = (char *)malloc(id3DataSize);
if (rawID3Tag == NULL)
NSLog(#"could not allocate %lu bytes of memory for ID3 tag", id3DataSize);
error = AudioFileGetProperty(fileID, kAudioFilePropertyID3Tag, &id3DataSize, rawID3Tag);
if( error != noErr )
NSLog(#"AudioFileGetPropertyID3Tag failed");
UInt32 id3TagSize = 0;
UInt32 id3TagSizeLength = 0;
error = AudioFormatGetProperty(kAudioFormatProperty_ID3TagSize, id3DataSize, rawID3Tag, &id3TagSizeLength, &id3TagSize);
if (error != noErr) {
NSLog( #"AudioFormatGetProperty_ID3TagSize failed" );
switch(error) {
case kAudioFormatUnspecifiedError:
NSLog( #"Error: audio format unspecified error" );
break;
case kAudioFormatUnsupportedPropertyError:
NSLog( #"Error: audio format unsupported property error" );
break;
case kAudioFormatBadPropertySizeError:
NSLog( #"Error: audio format bad property size error" );
break;
case kAudioFormatBadSpecifierSizeError:
NSLog( #"Error: audio format bad specifier size error" );
break;
case kAudioFormatUnsupportedDataFormatError:
NSLog( #"Error: audio format unsupported data format error" );
break;
case kAudioFormatUnknownFormatError:
NSLog( #"Error: audio format unknown format error" );
break;
default:
NSLog( #"Error: unknown audio format error" );
break;
}
}
CFDictionaryRef piDict = nil;
UInt32 piDataSize = sizeof(piDict);
error = AudioFileGetProperty(fileID, kAudioFilePropertyInfoDictionary, &piDataSize, &piDict);
if (error != noErr)
NSLog(#"AudioFileGetProperty failed for property info dictionary");
free(rawID3Tag);
return (NSDictionary*)piDict;
}
I know through kAudioFilePropertyAlbumArtwork i can get the album art of the mp3 file, but I do not know how to get it.

Answer 1

- (NSArray *)artworksForFileAtPath:(NSString *)path {
NSMutableArray *artworkImages = [NSMutableArray array];
NSURL *u = [NSURL fileURLWithPath:path];
AVURLAsset *a = [AVURLAsset URLAssetWithURL:u options:nil];
NSArray *artworks = [AVMetadataItem metadataItemsFromArray:a.commonMetadata withKey:AVMetadataCommonKeyArtwork keySpace:AVMetadataKeySpaceCommon];
for (AVMetadataItem *i in artworks)
{
NSString *keySpace = i.keySpace;
UIImage *im = nil;
if ([keySpace isEqualToString:AVMetadataKeySpaceID3])
{
NSDictionary *d = [i.value copyWithZone:nil];
im = [UIImage imageWithData:[d objectForKey:#"data"]];
}
else if ([keySpace isEqualToString:AVMetadataKeySpaceiTunes])
im = [UIImage imageWithData:[i.value copyWithZone:nil]];
if (im)
[artworkImages addObject:im];
}
NSLog(#"array description is %#", [artworkImages description]);
return artworkImages; }
The Above code return the album_art of the mp3 file. Where path is the audio file path.