获取MP3文件信息的代码

两个方法都是获取mp3文件信息的，也可以获取m4a文件的信息，自己留着备用，乱码问题还未解决

-(void)getMp3Information
{
NSURL *fileUrl = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/RudyExpandedScore.mp3",musicDir]];
AudioFileTypeID fileTypeHint = kAudioFileMP3Type;
NSString *fileExtension = [[fileUrl path] pathExtension];
if ([fileExtension isEqualToString:@"mp3"]) {
AudioFileID fileID = nil;
OSStatus error = noErr;

error = AudioFileOpenURL((__bridge CFURLRef)fileUrl, kAudioFileReadPermission, 0, &fileID);
if (error != noErr) {
DeLog(@"open error");
}

UInt32 id3DataSize = 0;
error = AudioFileGetPropertyInfo(fileID, kAudioFilePropertyID3Tag, &id3DataSize, NULL);
if (error != noErr) {
DeLog(@"AudioFileGetPropertyInfo Failed!");
}

NSDictionary *piDict = nil;
UInt32 piDataSize = sizeof(piDict);
error = AudioFileGetProperty(fileID, kAudioFilePropertyInfoDictionary, &piDataSize, &piDict);
if (error != noErr) {
DeLog(@"AudioFileGetProperty Failed!");
}

CFDataRef albumPic = nil;
UInt32 picDataSize = sizeof(albumPic);
error = AudioFileGetProperty(fileID, kAudioFilePropertyAlbumArtwork, &picDataSize, &albumPic);
if (error != noErr) {
DeLog(@"AudioFileGetProperty failed!(album)");
}

NSData *imageData = (__bridge NSData *)albumPic;
UIImage *img = [UIImage imageWithData:imageData];
lrcImageView.image = img;

NSString *album = [(NSDictionary *)piDict objectForKey:[NSString stringWithUTF8String:kAFInfoDictionary_Album]];
NSString *artlist = [(NSDictionary *)piDict objectForKey:[NSString stringWithUTF8String:kAFInfoDictionary_Artist]];
NSString *title = [(NSDictionary *)piDict objectForKey:@kAFInfoDictionary_Title];

DeLog(@"album: %@\nartList: %@,Title: %@",album,artlist,title);
DeLog(@"mp3Dic: %@",piDict);
}
}

-(void)getMp3InfoWithAVURLAsset
{
NSURL *fileUrl = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/RudyExpandedScore.mp3",musicDir]];
AVURLAsset *mp3Asset = [AVURLAsset URLAssetWithURL:fileUrl options:nil];
for (NSString *format in [mp3Asset availableMetadataFormats]) {
DeLog(@"formatString: %@",format);
for (AVMetadataItem *metadataitem in [mp3Asset metadataForFormat:format]) {
DeLog(@"commonKey = %@",metadataitem.commonKey);
if ([metadataitem.commonKey isEqualToString:@"artwork"]) {
NSData *data = [(NSDictionary *)metadataitem.value objectForKey:@"data"];
NSString *mime = [(NSDictionary *)metadataitem.value objectForKey:@"MIME"];
lrcImageView.image = [UIImage imageWithData:data];
DeLog(@"mime: %@",mime);
break;
}
else if([metadataitem.commonKey isEqualToString:@"title"])
{
NSString *title = (NSString *)metadataitem.value;
DeLog(@"title: %@",title);
}
else if([metadataitem.commonKey isEqualToString:@"artist"])
{
NSString *artist = (NSString *)metadataitem.value;
DeLog(@"artist: %@",artist);
}
else if([metadataitem.commonKey isEqualToString:@"albumName"])
{
NSString *albumName = (NSString *)metadataitem.value;

DeLog(@"albumName: %@",albumName);
}
}
}

CMTime durationTime = mp3Asset.duration;
CGFloat duration = CMTimeGetSeconds(durationTime);
DeLog(@"总时间：%f",duration);

}