如何使用Unity和IOS来检测麦克风中的打击

如何解决如何使用Unity和IOS来检测麦克风中的打击

| 我知道有多个线程存在相同的问题，但是我无法使其解决方案正常工作。我最终创建了这个课：微控制器

#import Foundation/Foundation.h>

#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>

#import <UIKit/UIKit.h>

@interface MicroController : UIView < UITextFieldDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate,AVAudioSessionDelegate > {
    AVAudioRecorder *recorder;
    NSTimer *levelTimer;
    double lowPassResults;
}

- (void)levelTimerCallback:(NSTimer *)timer;
@end

微控制器

#import \"MicroController.h\"


@implementation MicroController

- (id)init
{
    NSURL *url = [NSURL fileURLWithPath:@\"/dev/null\"];

    NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
                              [NSNumber numberWithFloat: 44100.0],AVSampleRateKey,[NSNumber numberWithInt: kAudioFormatAppleLossless],AVFormatIDKey,[NSNumber numberWithInt: 1],AVNumberOfChannelsKey,[NSNumber numberWithInt: AVAudioQualityMax],AVEncoderAudioQualityKey,nil];

    NSError *error;

    recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];

    if (recorder) {

        [recorder prepareToRecord];
        recorder.meteringEnabled = YES;

        if ([recorder prepareToRecord] == YES){
            [recorder record];
        }else {
            int errorCode = CFSwapInt32HostToBig ([error code]); 
            NSLog(@\"Error: %@ [%4.4s])\",[error localizedDescription],(char*)&errorCode); 

        }

        levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];
    } else
        NSLog([error description]); 

    // input \'level\' is in meter.mAveragePower

    return self;
}

- (void)levelTimerCallback:(NSTimer *)timer {
    [recorder updateMeters];

    const double ALPHA = 1.0; // 0.05f
    double peakPowerForChannel = pow(10,(0.05 * [recorder peakPowerForChannel:0]));
    lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;  

    if (lowPassResults > 0.55)
        NSLog(@\"Mic blow detected\");


    [recorder updateMeters];
    NSLog(@\"Average input: %f Peak input: %f\",[recorder averagePowerForChannel:0],[recorder peakPowerForChannel:0]);

}
    - (void)viewDidLoad {
        [super viewDidLoad];

        NSLog(@\"initiated\");

        NSURL *url = [NSURL fileURLWithPath:@\"/dev/null\"];

        NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
                                  [NSNumber numberWithFloat: 44100.0],nil];

        NSError *error;

        recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];

        if (recorder) {
            [recorder prepareToRecord];
            recorder.meteringEnabled = YES;
            [recorder record];
            levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];
        } else
            NSLog([error description]);

    }


    - (void)dealloc {
        [levelTimer release];
        [recorder release];
        [super dealloc];
    }
    @end

但是我无法使麦克风正常工作。我仅收到此输出，并且麦克风从不响应：平均输入：-120.000000峰值输入：-120.000000 有什么错误的想法吗？谢谢你的帮助！

解决方法

好吧，我认为提到我正在团结一致并不重要，这是罪魁祸首。 Unity会修改一些设置，因此在加载ViewController时一定要这样做：

[[AVAudioSession sharedInstance]
 setCategory: AVAudioSessionCategoryPlayAndRecord
 error: &setCategoryError];
if (setCategoryError) {
    NSLog([setCategoryError description]);
}

否则，完美编写的录音机将无法正常工作。就是这样..问题解决了！此错误是一个难以检测的错误，希望此消息对处于同样困境的任何其他人有所帮助。 , 好的，这是解决方法：文件\“ MicController.m \”

#import \"MicController.h\"


static MicController *sharedListener = nil;


@implementation MicController


+ (MicController *)sharedListener {
    @synchronized(self) {
        if (sharedListener == nil)
            [[self alloc] init];
    }

    return sharedListener;
}

- (void)dealloc {
    //[sharedListener stop];
    //[levelTimer release];
    [recorder release];
    [super dealloc];
}

#pragma mark -
#pragma mark Listening

- (void)listen {

    [[AVAudioSession sharedInstance]
     setCategory: AVAudioSessionCategoryPlayAndRecord
     error: nil];




    NSURL *url = [NSURL fileURLWithPath:@\"/dev/null\"];

    //kAudioFormatAppleIMA4
    //kAudioFormatMPEG4AAC
    /*
    NSMutableDictionary *settings = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                     [NSNumber numberWithFloat: 44100.0],AVSampleRateKey,[NSNumber numberWithInt: kAudioFormatAppleLossless],AVFormatIDKey,[NSNumber numberWithInt: 1],AVNumberOfChannelsKey,[NSNumber numberWithInt: AVAudioQualityMax],AVEncoderAudioQualityKey,nil];
    */

    NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
                              [NSNumber numberWithFloat: 44100.0],[NSNumber numberWithInt: 2],nil];
                              /*
                              [NSNumber numberWithFloat: 44100.0],[NSNumber numberWithInt: kAudioFormatMPEG4AAC],[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,[NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,AVLinearPCMIsFloatKey,nil];
                                */
    NSError *error;

    recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];

    if (recorder) {
        [recorder prepareToRecord];
        recorder.meteringEnabled = YES;
        [recorder record];
        //levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];
    } else
        NSLog([error description]); 
}
- (void)stop {
    [recorder release];
}

/*
- (void)levelTimerCallback:(NSTimer *)timer {
    [recorder updateMeters];

    const double ALPHA = 0.05;
    double peakPowerForChannel = pow(10,(0.05 * [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);


}
 */

#pragma mark -
#pragma mark Levels getters

- (Float32)averagePower {
    [recorder updateMeters];

    const double ALPHA = 0.7;
    double peakPowerForChannel = pow(10,(0.05 * [recorder averagePowerForChannel:0]));
    lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
    return [recorder averagePowerForChannel:0];
    //return lowPassResults;
    //NSLog(@\"Average input: %f Peak input: %f Low pass results: %f\",lowPassResults);

}
- (Float32)peakPower {
    [recorder updateMeters];

    const double ALPHA = 0.7;
    double peakPowerForChannel = pow(10,(0.05 * [recorder peakPowerForChannel:0]));
    lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
    return [recorder peakPowerForChannel:0];
    //return lowPassResults;
    //NSLog(@\"Average input: %f Peak input: %f Low pass results: %f\",lowPassResults);

}

#pragma mark -
#pragma mark Singleton Pattern

+ (id)allocWithZone:(NSZone *)zone {
    @synchronized(self) {
        if (sharedListener == nil) {
            sharedListener = [super allocWithZone:zone];
            return sharedListener;
        }
    }

    return nil;
}

- (id)copyWithZone:(NSZone *)zone {
    return self;
}

- (id)init {
    if ([super init] == nil)
        return nil;

    return self;
}

- (id)retain {
    return self;
}

- (unsigned)retainCount {
    return UINT_MAX;
}

- (void)release {
    // Do nothing.
}

- (id)autorelease {
    return self;
}


@end

只需添加代码

 [[AVAudioSession sharedInstance]
     setCategory: AVAudioSessionCategoryPlayAndRecord
     error: nil];

在上方作废\“-（无效）听{\” 谢谢。再见 , 在使用Titanium加速器的情况下，我也遇到同样的问题。在模拟器中，该类正常运行，但在设备中，平均输入= -120 这是代码：

//
//  MicController.h
//  Mic
//
//  Created by DekWilde on 10/26/11.
//  Copyright 2011 DekWilde. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>

@interface MicController : NSObject {
    AVAudioRecorder *recorder;
    //NSTimer *levelTimer;
    double lowPassResults;  
}

+ (MicController *)sharedListener;
- (void)listen;
- (void)stop;
//- (void)levelTimerCallback:(NSTimer *)timer;
- (Float32)averagePower;
- (Float32)peakPower;
@end

和MicController.m

    #import \"MicController.h\"


    static MicController *sharedListener = nil;


    @implementation MicController


    + (MicController *)sharedListener {
        @synchronized(self) {
            if (sharedListener == nil)
                [[self alloc] init];
        }

        return sharedListener;
    }

    - (void)dealloc {
        //[sharedListener stop];
        //[levelTimer release];
        [recorder release];
        [super dealloc];
    }

    #pragma mark -
    #pragma mark Listening

    - (void)listen {

        NSURL *url = [NSURL fileURLWithPath:@\"/dev/null\"];

        //kAudioFormatAppleIMA4
        //kAudioFormatMPEG4AAC
        /*
        NSMutableDictionary *settings = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                         [NSNumber numberWithFloat: 44100.0],nil];
        */

        NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
                                  [NSNumber numberWithFloat: 44100.0],nil];
                                  /*
                                  [NSNumber numberWithFloat: 44100.0],nil];
                                    */
        NSError *error;

        recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];

        if (recorder) {
            [recorder prepareToRecord];
            recorder.meteringEnabled = YES;
            [recorder record];
            //levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];
        } else
            NSLog([error description]); 
    }
    - (void)stop {
        [recorder release];
    }

    /*
    - (void)levelTimerCallback:(NSTimer *)timer {
        [recorder updateMeters];

        const double ALPHA = 0.05;
        double peakPowerForChannel = pow(10,(0.05 * [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\",lowPassResults);


    }
     */

    #pragma mark -
    #pragma mark Levels getters

    - (Float32)averagePower {
        [recorder updateMeters];

        const double ALPHA = 0.7;
        double peakPowerForChannel = pow(10,(0.05 * [recorder averagePowerForChannel:0]));
        lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
        return [recorder averagePowerForChannel:0];
        //return lowPassResults;
        //NSLog(@\"Average input: %f Peak input: %f Low pass results: %f\",lowPassResults);

    }
    - (Float32)peakPower {
        [recorder updateMeters];

        const double ALPHA = 0.7;
        double peakPowerForChannel = pow(10,(0.05 * [recorder peakPowerForChannel:0]));
        lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
        return [recorder peakPowerForChannel:0];
        //return lowPassResults;
        //NSLog(@\"Average input: %f Peak input: %f Low pass results: %f\",lowPassResults);

    }

    #pragma mark -
    #pragma mark Singleton Pattern

    + (id)allocWithZone:(NSZone *)zone {
        @synchronized(self) {
            if (sharedListener == nil) {
                sharedListener = [super allocWithZone:zone];
                return sharedListener;
            }
        }

        return nil;
    }

    - (id)copyWithZone:(NSZone *)zone {
        return self;
    }

    - (id)init {
        if ([super init] == nil)
            return nil;

        return self;
    }

    - (id)retain {
        return self;
    }

    - (unsigned)retainCount {
        return UINT_MAX;
    }

    //- (void)release {
        // Do nothing.
    //}

    - (id)autorelease {
        return self;
    }


@end

我的问题是：我需要将您发布的有关此问题的解决方案的代码放在哪里。。。我该如何解决这个问题？ , 现在，Unity 3.5已添加了对麦克风输入的支持，我建议您在Unity中进行操作，这样您就不必维护Cocoa代码，并且将来可以轻松将其移植到Android / Web / Native。已经有一些关于此的有用的文章： http://forum.unity3d.com/threads/123036-iOS-Microphone-input http://forum.unity3d.com/threads/118215-Blow-detection-（使用iOS-麦克风）

如何使用Unity和IOS来检测麦克风中的打击

如何解决如何使用Unity和IOS来检测麦克风中的打击

解决方法

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