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import UIKit
import AVFoundation
class ViewController: UIViewController {
var recorder:AVAudioRecorder? //录音器
var player:AVAudioPlayer? //播放器
var recorderSeetingsDic:[NSObject:AnyObject]? //录音器设置参数数组
var volumeTimer:NSTimer! //定时器线程，循环监测录音的音量大小
var aacPath:String? //录音存储路径
@IBOutlet weak var volumLab: UILabel! //显示录音音量
override func viewDidLoad() {
super.viewDidLoad()
//初始化录音器
let session:AVAudioSession = AVAudioSession.sharedInstance()
//用于获取失败原因
var error:NSError?
//设置录音类型
session.setCategory(AVAudioSessionCategoryPlayAndRecord, error: &error)
//设置支持后台
session.setActive(true, error: &error)
//获取Document目录
let docDir = NSSearchPathForDirectoriesInDomains(.DocumentDirectory,
.UserDomainMask, true)[0] as! String
//组合录音文件路径
aacPath = docDir + "/play.aac"
//初始化字典并添加设置参数
recorderSeetingsDic = Dictionary()
recorderSeetingsDic!.updateValue(NSNumber(long: kAudioFormatMPEG4AAC), forKey: AVFormatIDKey)
//录音器每秒采集的录音样本数
recorderSeetingsDic!.updateValue(NSNumber(long: 1000), forKey: AVSampleRateKey)
//录音的声道数，立体声为双声道
recorderSeetingsDic!.updateValue(NSNumber(long: 2), forKey: AVNumberOfChannelsKey)
//采样位数
recorderSeetingsDic!.updateValue(NSNumber(long: 8), forKey: AVLinearPCMBitDepthKey)
//大端还是小段，是内存的组织方式
recorderSeetingsDic!.updateValue(NSNumber(bool: false), forKey: AVLinearPCMIsBigEndianKey)
//采样信号是整数还是浮点
recorderSeetingsDic!.updateValue(NSNumber(bool: false), forKey: AVLinearPCMIsFloatKey)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//按下录音
@IBAction func downAction(sender: AnyObject) {
var error:NSError?
//初始化录音器
recorder = AVAudioRecorder(URL: NSURL(string: aacPath!),
settings: recorderSeetingsDic, error: &error)
if recorder != nil {
//开启仪表计数功能
recorder!.meteringEnabled = true
//准备录音
recorder!.prepareToRecord()
//开始录音
recorder!.record()
//启动定时器，定时更新录音音量
volumeTimer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self,
selector: "levelTimer", userInfo: nil, repeats: true)
}
}
//松开按钮，结束录音
@IBAction func upAction(sender: AnyObject) {
//停止录音
recorder?.stop()
//录音器释放
recorder = nil
//暂停定时器
volumeTimer.invalidate()
volumeTimer = nil
volumLab.text = "录音音量:0"
}
//播放录制的声音
@IBAction func playAction(sender: AnyObject) {
var error:NSError?
//播放
player = AVAudioPlayer(contentsOfURL: NSURL(string: aacPath!), error: &error)
if player == nil {
print("播放失败：\(error?.description)")
}else{
player?.play()
}
}
//定时检测录音音量
func levelTimer(){
recorder!.updateMeters() // 刷新音量数据
let averageV:Float = recorder!.averagePowerForChannel(0) //获取音量的平均值
let maxV:Float = recorder!.peakPowerForChannel(0) //获取音量最大值
let lowPassResult:Double = pow(Double(10), Double(0.05*maxV))
volumLab.text = "录音音量:\(lowPassResult)"
}
}
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