小编Ale*_* N.的帖子

我需要构建一个可视图表来表示录制文件中的语音级别(dB).我试着这样做:

NSError *error = nil;
AVAudioPlayer *meterPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:self.recording.fileName] error:&error];

if (error) {
    _lcl_logger(lcl_cEditRecording, lcl_vError, @"Cannot initialize AVAudioPlayer with file %@ due to: %@ (%@)", self.recording.fileName, error, error.userInfo);
} else {
    [meterPlayer prepareToPlay];
    meterPlayer.meteringEnabled = YES;

    for (NSTimeInterval i = 0; i <= meterPlayer.duration; ++i) {
        meterPlayer.currentTime = i;
        [meterPlayer updateMeters];
        float averagePower = [meterPlayer averagePowerForChannel:0];
        _lcl_logger(lcl_cEditRecording, lcl_vTrace, @"Second: %f, Level: %f dB", i, averagePower);
    }
}
[meterPlayer release];

如果它解决了它会很酷,但事实并非如此.我总是得到-160分贝.关于如何实现的任何其他想法？

UPD:这是我最后得到的:

替代文字http://img22.imageshack.us/img22/5778/waveform.png

我知道,这很奇怪,但即使您将hidesBackButton声明为与您的视图关联的UINavigationItem为YES,您也可以返回只是触摸本来是后退按钮的区域.

分享我的解决方案......(更多内容)