Я знаю, что есть несколько тем с такой же проблемой, но я не смог заставить их решение работать. В итоге я создал этот класс:
Микроконтроллер.h
#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
Микроконтроллер.мм
#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], 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;
[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
Но я не могу заставить микрофон работать. Я получаю только этот вывод, и микрофон никогда не отвечает:
Средний ввод: -120.000000 Пиковый ввод: -120.000000
Любая идея о том, что может быть не так?
Спасибо за вашу помощь !