在AVAudioRecorder中爲Channel獲取AveragePower和PeakPower

我很討厭這段代碼。我試圖讓averagePowerForChannel和peakPowerForChannel同時錄製音頻，但每次我得到它爲0.0在AVAudioRecorder中爲Channel獲取AveragePower和PeakPower

下面是我錄製音頻代碼：

NSMutableDictionary *recordSetting =[[NSDictionary alloc] initWithObjectsAndKeys:[NSNumber numberWithFloat: 22050.0], AVSampleRateKey, 
      [NSNumber numberWithInt: kAudioFormatLinearPCM], AVFormatIDKey, 
      [NSNumber numberWithInt: 1], AVNumberOfChannelsKey, 
      [NSNumber numberWithInt: AVAudioQualityMax], AVEncoderAudioQualityKey, 
      [NSNumber numberWithInt:32],AVLinearPCMBitDepthKey, 
      [NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey, 
      [NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey, 
      nil]; 

recorder1 = [[AVAudioRecorder alloc] initWithURL:[NSURL fileURLWithPath:audioFilePath] settings:recordSetting error:&err]; 
recorder1.meteringEnabled = YES; 
recorder1.delegate=self; 
[recorder1 prepareToRecord]; 
[recorder1 record]; 
levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.3f target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES]; 

- (void)levelTimerCallback:(NSTimer *)timer { 

[recorder1 updateMeters]; 

NSLog(@"Peak Power : %f , %f", [recorder1 peakPowerForChannel:0], [recorder1 peakPowerForChannel:1]); 
NSLog(@"Average Power : %f , %f", [recorder1 averagePowerForChannel:0], [recorder1 averagePowerForChannel:1]); 

}

什麼是在代碼中的錯誤？ ??

來源

2010-04-21 Biranchi

我想如果你設置AVNumberOfChannelsKey爲2 ...它會工作。

來源

2010-06-28 19:41:18

我覺得你必須在prepareToRecord之後使用屬性meteringEnabled。只是註釋中指定通道數量的部分爲1.讓它使用默認值。希望能幫助到你。

來源

2010-09-16 12:47:20 Viraj

謝謝！我不能相信我錯過了這一點。（這就是'meteringEnabled'。頻道數量無關緊要，我很肯定。） – Kalle 2012-08-14 20:53:00

在AVAudioRecorder中爲Channel獲取AveragePower和PeakPower

回答

相關問題