获取MP3的信息
方法1：
1 //读取mp3里的信息 2 AudioFileID fileID; 3 4 AudioFileTypeID typeIdMP3 = kAudioFileMP3Type; 5 6 OSStatus status = noErr; 7 //读取mp3文件 8 status = AudioFileOpenURL((__bridge CFURLRef)fileURL, kAudioFileReadPermission, typeIdMP3, &fileID); 9 if (status != noErr) { 10 NSLog(@"AudioFileOpenURL Failure"); 11 } 12 13 // ID3，一般是位于一个mp3文件的开头或末尾的若干字节内，附加了关于该mp3的歌手，标题，专辑名称，年代，风格等信息，该信息就被称为ID3信息，ID3信息分为两个版本，v1和v2版。 其中：v1版的ID3在mp3文件的末尾128字节，以TAG三个字符开头，后面跟上歌曲信息。 v2版一般位于mp3的开头，可以存储歌词，该专辑的图片等大容量的信息。 14 UInt32 id3DataSize = 0; 15 status = AudioFileGetPropertyInfo(fileID, kAudioFilePropertyID3Tag, &id3DataSize, NULL); 16 if (status != noErr) { 17 NSLog(@"读id3DataSize失败，没有附加信息"); 18 } 19 NSLog(@"id3DataSize: %ld",id3DataSize); 20 21 //唱片信息 22 NSDictionary *propertyInfo = nil; 23 UInt32 piDataSize = sizeof(propertyInfo); 24 status = AudioFileGetProperty(fileID, kAudioFilePropertyInfoDictionary, &piDataSize, &propertyInfo); 25 if (status != noErr) { 26 NSLog(@"读取唱片信息失败"); 27 } 28 NSLog(@"propertyInfo: %@",propertyInfo); 29 30 31 32 //唱片封面 这里获取到的图片数据是空的，暂时不知道为什么，建议使用方法2，简单 33 CFDataRef albumPic = nil; 34 UInt32 albumPicDataSize = sizeof(albumPic); 35 status = AudioFileGetProperty(fileID, kAudioFilePropertyAlbumArtwork, &albumPicDataSize, &albumPic); 36 37 if (status != noErr) { 38 NSLog(@"读取唱片封面失败"); 39 } 40 //获取专辑名称 41 NSString *album = propertyInfo[@"album"]; 42 NSString *artist = propertyInfo[@"artist"]; 43 NSString *title = propertyInfo[@"title"]; 44 NSString *year = propertyInfo[@"year"]; 45 CZMP3Info *mp3Info = [[CZMP3Info alloc] init]; 46 47 mp3Info.album = album; 48 mp3Info.artist = artist; 49 mp3Info.title = title; 50 mp3Info.year = year; 51 mp3Info.albumArtwork = (__bridge NSData *)albumPic;
方法2：
1 AVURLAsset *assest = [AVURLAsset URLAssetWithURL:fileURL options:nil]; 2 3 CZMP3Info *mp3Info = [[CZMP3Info alloc] init]; 4 NSLog(@"%@",assest.lyrics); 5 for (NSString *key in [assest availableMetadataFormats]) { 6 for (AVMetadataItem *item in [assest metadataForFormat:key]) { 7 NSString *commonKey = item.commonKey; 8 9 if ([commonKey isEqualToString:@"artist"]) {//歌手 10 mp3Info.artist = (NSString *)item.value; 11 }else if([commonKey isEqualToString:@"albumName"]){//专辑名称 12 mp3Info.album = (NSString *)item.value; 13 }else if([commonKey isEqualToString:@"title"]){//歌曲名 14 mp3Info.title = (NSString *)item.value; 15 }else if ([commonKey isEqualToString:@"artwork"]){ 16 NSDictionary *artworkDict = (NSDictionary *)item.value; 17 NSData *image = [artworkDict objectForKey:@"data"]; 18 mp3Info.albumArtwork = image; 19 } 20 } 21 } 22 23 CMTime durationTime = assest.duration; 24 CGFloat duration = CMTimeGetSeconds(durationTime);
