Question

这里是我的录音代码，现在如何通过样本UIable浮点数

获取麦克风中的声级输入

我想我会使用这个功能，但我如何在rec.h＆amp; rec.m文件

（无效）updateMeters

AVAudioSession * audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[audioSession setActive:YES error:nil];
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];
recordedTmpName = [[NSString alloc] initWithFormat:@"%.0f.%@", [NSDate timeIntervalSinceReferenceDate] * 1000.0, @"aac"];
temporaryRecFile= [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:recordedTmpName]];
recorder = [[ AVAudioRecorder alloc] initWithURL:temporaryRecFile settings:recordSetting error:nil];
[recorder setDelegate:self];
[recorder prepareToRecord];
[recorder record];

Answer 1

在录制过程中，您必须定期调用updateMeters，并获得平均功率 - （float）averagePowerForChannel：（NSUInteger）channelNumber

[recorder setDelegate:self];
[recorder prepareToRecord];
recorder.meteringEnabled = YES;
[recorder record];
NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:@selector(handleTimer) userInfo:nil repeats:YES];




- (void) handleTimer
{
    [recorder updateMeters];
    label.text = [NSString stringWithFormat:@"lf",[recorder averagePowerForChannel:0]];
}

要查看更多信息，请访问 AVAudioRecorder Class Reference

ios，当麦克风录制音频时，获得浮动级麦克风更新

1 个答案: