【发布时间】：2014-03-18 14:02:41
【问题描述】：
在我的应用中，我无法听到声音。特别是这是我的代码：
#import <QuartzCore/QuartzCore.h>
#import <AudioToolbox/AudioToolbox.h>
#import "ViewController.h"
#import "RIOInterface.h"
#import "KeyHelper.h"
#import "Toast+UIView.h"
@interface ViewController () {
BOOL watermarkReceived;
float frequencyRecived;
CABasicAnimation *theAnimation;
BOOL water1, water2, water3, water4, noWater;
}
@property(nonatomic)NSTimer *timer, *timer2;
@property(nonatomic,strong)AVAudioPlayer *player;
@property(nonatomic,strong)NSURL *url;
@end
@implementation ViewController
@synthesize isListening;
@synthesize rioRef;
@synthesize currentFrequency;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//self.labelPosition.font=[UIFont fontWithName:@"DBLCDTempBlack" size:20.0];
NSError *error;
self.url = [NSURL fileURLWithPath:[[NSBundle mainBundle]pathForResource:@"sms_alert_circles" ofType:@"mp3"]];
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:self.url error:&error];
AVAudioSession *session = [AVAudioSession sharedInstance];
NSError *setCategoryError = nil;
[session setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:&setCategoryError];
[self.imageLed setImage:[UIImage imageNamed:@"image_led_red.png"]];
self.rioRef = [RIOInterface sharedInstance];
[rioRef setSampleRate:44100];
[rioRef setFrequency:394];//294
[rioRef initializeAudioSession];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)startListenWatermark:(UIButton *)sender {
if ([sender isSelected]) {
[self stopListener];
[UIApplication sharedApplication].idleTimerDisabled = NO;
[sender setSelected:NO];
[self.imageListening.layer removeAllAnimations];
[self.imageLed setImage:[UIImage imageNamed:@"image_led_red.png"]];
//self.labelPosition.font=[UIFont fontWithName:@"DBLCDTempBlack" size:20.0];
self.labelPosition.text = @"Nessuna postazione";
} else {
water1 = water2 = water3 = water4 = NO;
[self startListener];
[UIApplication sharedApplication].idleTimerDisabled = YES;
[sender setSelected:YES];
[self.imageLed setImage:[UIImage imageNamed:@"image_led_red.png"]];
self.labelPosition.text = @"Nessuna postazione";
theAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
theAnimation.duration = 0.4;
theAnimation.repeatDuration = 10000;
theAnimation.autoreverses = YES;
theAnimation.delegate = self;
theAnimation.fromValue = [NSNumber numberWithFloat:1.0];
theAnimation.toValue = [NSNumber numberWithFloat:0.1];
[self.imageListening.layer addAnimation:theAnimation forKey:@"animateOpacity"];
}
}
#pragma mark Listener methods
- (void)startListener {
[self.rioRef startListening:self];
}
- (void)stopListener {
[self.rioRef stopListening];
}
- (void)frequencyChangedWithValue:(float)newFrequency {
frequencyRecived = newFrequency;
watermarkReceived = YES;
if (frequencyRecived > 18000) {
if (frequencyRecived >= 18000 && frequencyRecived <= 18110 && !water1) {
[self.timer invalidate];
self.timer = nil;
[self performSelectorOnMainThread:@selector(setTextInLabel:) withObject:@"1" waitUntilDone:YES];
water2 = water3 = water4 = NO;
water1 = YES;
noWater = YES;
}
if (frequencyRecived >= 18115 && frequencyRecived <= 18250 && !water2) {
[self.timer invalidate];
self.timer = nil;
[self performSelectorOnMainThread:@selector(setTextInLabel:) withObject:@"2" waitUntilDone:YES];
water1 = water3 = water4 = NO;
water2 = YES;
noWater = YES;
}
if (frequencyRecived >= 18255 && frequencyRecived <= 18440 && !water3) {
[self.timer invalidate];
self.timer = nil;
[self performSelectorOnMainThread:@selector(setTextInLabel:) withObject:@"3" waitUntilDone:YES];
water1 = water2 = water4 = NO;
water3 = YES;
noWater = YES;
}
if (frequencyRecived >= 18445 && !water4) {
[self.timer invalidate];
self.timer = nil;
[self performSelectorOnMainThread:@selector(setTextInLabel:) withObject:@"4" waitUntilDone:YES];
water1 = water2 = water3 = NO;
water4 = YES;
noWater = YES;
}
} else {
if (noWater) {
[self performSelectorOnMainThread:@selector(noWatermark) withObject:nil waitUntilDone:YES];
noWater = NO;
}
}
}
- (void)noWatermark {
self.timer = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(noPosition:) userInfo:nil repeats:NO];
}
- (void)noPosition:(NSTimer*)aTimer {
[self performSelectorOnMainThread:@selector(setTextInLabel:) withObject:@"Nessuna postazione" waitUntilDone:YES];
[self performSelectorInBackground:@selector(redLed) withObject:nil];
self.timer2 = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(resetFlags) userInfo:nil repeats:NO];
}
- (void)resetFlags {
water1 = water2 = water3 = water4 = NO;
}
- (void)redLed {
[self.imageLed setImage:[UIImage imageNamed:@"image_led_red.png"]];
}
- (void)setTextInLabel:(NSString*)position {
[self.timer invalidate];
self.timer = nil;
if ([position isEqualToString:@"Nessuna postazione"]) {
self.labelPosition.text = position;
}
self.labelPosition.text = position;
if (![position isEqualToString:@"Nessuna postazione"]) {
[self.player setVolume:1.0];
[self.player prepareToPlay];
[self.player play];
NSString *textForToast = [NSString stringWithFormat:@"Postazione %@", position];
UIImage *image = [[UIImage alloc]init];
if ([position isEqualToString:@"1"]) {
image = [UIImage imageNamed:@"image_smart.png"];
}
if ([position isEqualToString:@"2"]) {
image = [UIImage imageNamed:@"image_500.png"];
}
if ([position isEqualToString:@"3"]) {
image = [UIImage imageNamed:@"image_mini.png"];
}
if ([position isEqualToString:@"4"]) {
image = [UIImage imageNamed:@"image_aygo.png"];
}
[self.view makeToast:textForToast duration:5.0 position:@"bottom" title:@"Watermark ricevuto" image:image];
[self.imageLed setImage:[UIImage imageNamed:@"image_led_green.png"]];
}
}
@end
特别是，此类应该听到（使用麦克风）音频信号，其中有一些频率 >= 18000 Hz 的音调。所以我会这样做：当它识别出频率 >= 18000 Hz 的音调时，它应该播放声音。 当我尝试在设备上运行该应用程序时，我使用 iPhone 扬声器听到了非常低音量的声音，但是当我插入耳机时，我听到了高音量的声音。我尝试使用模拟器运行该应用程序，当我使用模拟器时它运行良好。为什么？你能帮我修一下这门课吗？
PS：检测我正在使用的声音的频率pitch detector。
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