在AVAudioRecorder中为Channel获取AveragePower和PeakPower

我很讨厌这段代码。我试图让averagePowerForChannel和peakPowerForChannel同时录制音频，但每次我得到它为0.0在AVAudioRecorder中为Channel获取AveragePower和PeakPower

下面是我录制音频代码：

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]); 

}

什么是在代码中的错误？ ??

来源

2010-04-21 Biranchi

我想如果你设置AVNumberOfChannelsKey为2 ...它会工作。

来源

2010-06-28 19:41:18

我觉得你必须在prepareToRecord之后使用属性meteringEnabled。只是注释中指定通道数量的部分为1.让它使用默认值。希望能帮助到你。

来源

2010-09-16 12:47:20 Viraj

谢谢！我不能相信我错过了这一点。（这就是'meteringEnabled'。频道数量无关紧要，我很肯定。） – Kalle 2012-08-14 20:53:00

在AVAudioRecorder中为Channel获取AveragePower和PeakPower

回答

相关问题