Question

我需要在swift中开发一个iOS应用程序，用于检测用户对麦克风的打击。这必须是一个挑战游戏，两个玩家必须一个接一个地吹入iPhone麦克风。分贝值应该以米或公里为单位进行测量和转换，这样我才能确定胜利者。 “进一步吹”（球员1：50公里，球员2：70公里）的球员获胜。

这是可能的实施吗？

我在swift中有这个代码，我不知道如何继续：

import Foundation
import UIKit
import AVFoundation
import CoreAudio

class ViewController: UIViewController {
// @IBOutlet weak var mainImage: UIImageView!

var recorder: AVAudioRecorder!
var levelTimer = NSTimer()
var lowPassResults: Double = 0.0
override func viewDidLoad() {
    super.viewDidLoad()
    let url = NSURL.fileURLWithPath("dev/null")
    //numbers are automatically wrapped into NSNumber objects, so I simplified that to [NSString : NSNumber]
    var settings : [NSString : NSNumber] = [AVSampleRateKey: 44100.0, AVFormatIDKey: kAudioFormatAppleLossless, AVNumberOfChannelsKey: 1, AVEncoderAudioQualityKey: AVAudioQuality.Max.rawValue]
    var error: NSError?
   // mainImage?.image = UIImage(named: "flyForReal.png");
    recorder = AVAudioRecorder(URL:url, settings:settings, error:&error)

    if((recorder) != nil){
        recorder.prepareToRecord()
        recorder.meteringEnabled = true
        recorder.record()
        levelTimer = NSTimer.scheduledTimerWithTimeInterval(0.05, target: self, selector: Selector("levelTimerCallback"), userInfo: nil, repeats: true)
    }
    else{
        NSLog("%@", "Error");
    }
}
func levelTimerCallback(timer:NSTimer) {
    recorder.updateMeters()

    let ALPHA: Double = 0.05
    var peakPowerForChannel = pow(Double(10), (0.05 * Double(recorder.peakPowerForChannel(0))))
    lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
    if(lowPassResults > 0.95){
        NSLog("@Mic blow detected");
    }
    NSLog("@Average input: %f Peak input: %f Low pass results: %f", recorder.averagePowerForChannel(0), recorder.peakPowerForChannel(0), lowPassResults);
 }
}

非常感谢！

Answer 1

关闭。你有几个问题。你的选择器调用会崩溃应用程序，因为你没有传递参数而levelTimerCallback()期望一个。

averagePowerPerChannel似乎给了我一个更实时的计量，所以我使用了它而不是peakPowerPerChannel

此外，您需要设置音频会话。我不太确定所有的数学是什么，所以我在这里摆脱它。我已粘贴下面的整个视图控制器进行基本的麦克风检测。

import Foundation
import UIKit
import AVFoundation
import CoreAudio

class ViewController: UIViewController {

var recorder: AVAudioRecorder!
var levelTimer = NSTimer()
var lowPassResults: Double = 0.0

override func viewDidLoad() {
    super.viewDidLoad()

    //make an AudioSession, set it to PlayAndRecord and make it active
    var audioSession:AVAudioSession = AVAudioSession.sharedInstance()
    audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil)
    audioSession.setActive(true, error: nil)

    //set up the URL for the audio file
    var documents: AnyObject = NSSearchPathForDirectoriesInDomains( NSSearchPathDirectory.DocumentDirectory,  NSSearchPathDomainMask.UserDomainMask, true)[0]
    var str =  documents.stringByAppendingPathComponent("recordTest.caf")
    var url = NSURL.fileURLWithPath(str as String)

    // make a dictionary to hold the recording settings so we can instantiate our AVAudioRecorder
    var recordSettings: [NSObject : AnyObject] = [AVFormatIDKey:kAudioFormatAppleIMA4,
        AVSampleRateKey:44100.0,
        AVNumberOfChannelsKey:2,AVEncoderBitRateKey:12800,
        AVLinearPCMBitDepthKey:16,
        AVEncoderAudioQualityKey:AVAudioQuality.Max.rawValue

    ]

    //declare a variable to store the returned error if we have a problem instantiating our AVAudioRecorder
    var error: NSError?

    //Instantiate an AVAudioRecorder
    recorder = AVAudioRecorder(URL:url, settings: recordSettings, error: &error)
    //If there's an error, print that shit - otherwise, run prepareToRecord and meteringEnabled to turn on metering (must be run in that order)
    if let e = error {
        println(e.localizedDescription)
    } else {
        recorder.prepareToRecord()
        recorder.meteringEnabled = true

        //start recording
        recorder.record()

        //instantiate a timer to be called with whatever frequency we want to grab metering values
        self.levelTimer = NSTimer.scheduledTimerWithTimeInterval(0.02, target: self, selector: Selector("levelTimerCallback"), userInfo: nil, repeats: true)

    }

}

//This selector/function is called every time our timer (levelTime) fires
func levelTimerCallback() {
    //we have to update meters before we can get the metering values
    recorder.updateMeters()

    //print to the console if we are beyond a threshold value. Here I've used -7
    if recorder.averagePowerForChannel(0) > -7 {
        print("Dis be da level I'm hearin' you in dat mic ")
        println(recorder.averagePowerForChannel(0))
        println("Do the thing I want, mofo")
    }
}



override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

Answer 2

我转换了安德鲁对Swift 4的回答：

"message": "Unexpected apiai response format: Empty speech response",
"apiResponse": {
  "id": "905d5727-bea8-4630-8d3a-e6c173159a94",
  "timestamp": "2017-09-28T02:20:06.954Z",
  "lang": "en",
  "result": {},
  "status": {
    "code": 206,
    "errorType": "partial_content",
    "errorDetails": "Webhook call failed. Error: Webhook response was empty."
  },
  "sessionId": "1506565201634"
}

iOS - 检测吹入麦克风并转换结果！（迅速）

2 个答案:

iOS - 检测吹入麦克风并转换结果！ （迅速）

2 个答案:

iOS - 检测吹入麦克风并转换结果！（迅速）