录音获取文件大小

Posted 2023-02-25

【中文标题】录音获取文件大小

【英文标题】：Audio Recording get file size

【发布时间】：2014-07-08 22:07:03

【问题描述】：

我正在使用 AVAudioRecorder 在我的 ios 应用程序中录制某些内容，并且我想以字节为单位获取录制文件的大小。有什么办法可以做到吗？

这是我设置记录器的代码：

NSArray *pathComponents = [NSArray arrayWithObjects:
                               [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
                               @"MyAudioMemo.m4a",
                               nil];
    outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

    // Setup audio session
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

    // Define the recorder setting
    NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    // Initiate and prepare the recorder
    recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:nil];
    recorder.delegate = self;
    recorder.meteringEnabled = YES;
    [recorder prepareToRecord];

这是我试图获取文件大小的地方：

- (void) audioRecorderDidFinishRecording:(AVAudioRecorder *)avrecorder successfully:(BOOL)flag
    // Convert to NSData
    NSData *data = [NSData dataWithContentsOfFile:recorder.url];
    // Convert to NSString
    NSString* dataAsString = [NSString stringWithUTF8String:[data bytes]];
NSLog(@"Size: %@", dataAsString);

NSLog 不返回任何内容。任何帮助表示赞赏。

【参考方案1】：

好的，我想通了，您可以通过以下方式获取文件大小：

unsigned long long size = [[NSFileManager defaultManager] attributesOfItemAtPath:[recorder.url path] error:nil].fileSize;

然后将其转换为字符串：

NSLog(@"This is the file size of the recording in bytes: %llu", size);

【参考方案2】：

Swift 5，我刚刚将它添加到我的 audioRecorderDidFinishRecording 委托函数的末尾：

    guard let attributes = try? FileManager.default.attributesOfItem(atPath: url.path) else 
        print("::: NO FILE SIZE!")
        return
    

    if let fileSize = attributes[FileAttributeKey.size] as? Double 
        let bcf = ByteCountFormatter()
        bcf.countStyle = .file
        let fileSize64 = Int64(fileSize)

        // BYTES:
        print("There were \(fileSize) bytes")

        // KILOBYTES:
        bcf.allowedUnits = [.useKB]
        let kbSizeString = bcf.string(fromByteCount: fileSize64)
        print("::: FILE SIZE: " + kbSizeString)

        // MEGABYTES:
        bcf.allowedUnits = [.useMB]
        let mbSizeString = bcf.string(fromByteCount: fileSize64)
        print("::: FILE SIZE: " + mbSizeString)