AVAudioPlayer mp3 文件无法播放

Posted 2023-02-25

【中文标题】AVAudioPlayer mp3 文件无法播放

【英文标题】：AVAudioPlayer mp3 file not playing

【发布时间】：2013-09-10 00:02:16

【问题描述】：

我是一名业余开发人员，正在制作一个包含在按下按钮时播放的声音文件 (mp3) 的 ios 应用程序。但是，声音没有播放（在移动设备上测试，而不是 ios 模拟器）。我已经在捆绑资源中有声音文件，并添加了 AVFoundation 以将二进制文件与库链接。我有 xcode 4.6 和 mac osx 10.8.4。这是我的 viewcontroller.h 代码：

#import <UIKit/UIKit.h>
#import <RevMobAds/RevMobAds.h>
#import <AVFoundation/AVFoundation.h>


@interface ViewController : UIViewController 


- (IBAction)playButton:(id)sender;
- (IBAction)stopButton:(id)sender;

@property (nonatomic, strong) AVAudioPlayer *avPlayer;

- (void)revmob;
@end

视图控制器.m：

#import "ViewController.h"
#import <RevMobAds/RevMobAds.h>


@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

    [super viewDidLoad];
    [[RevMobAds session] showBanner];
    // Do any additional setup after loading the view, typically from a nib.
    NSString *stringPath = [[NSBundle mainBundle] pathForResource:@"98648__dobroide__20100606-mosquito" ofType:@"mp3"];
    if (stringPath) 
    
        NSURL *url = [NSURL fileURLWithPath:stringPath];

        NSError *error;

       _avPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
        if (!error) 
        
            [_avPlayer setNumberOfLoops:-1];
         
        else  
        
            NSLog(@"Error occurred: %@", [error localizedDescription]);
        
     
    else 
    
        NSLog(@"Resource not found");
    
    [self performSelector:@selector(revmob) withObject:nil afterDelay:10.0];


- (void)revmob 

    [[RevMobAds session] showFullscreen];

- (IBAction)playButton:(id)sender 

    [_avPlayer play];
    NSLog(@"Sound playing");


- (IBAction)stopButton:(id)sender 

    [_avPlayer pause];
    NSLog(@"Sound Stopped");

@end

【参考方案1】：

在 ViewController.h 中导入 AVFoundation 头文件： #导入

转到 ViewController.m 并在接口部分添加以下插座属性和 IBAction 方法定义：

@interface ViewController () 

@property (nonatomic, strong) IBOutlet UILabel *trackTitle;
@property (nonatomic, strong) IBOutlet UILabel *playedTime;

- (IBAction)stopSound:(id)sender; 
- (IBAction)playOrPauseSound:(id)sender;

@end

返回 ViewController.xib 并进行以下连接：

顶部标签 -> trackTitle 出口

中间标签->playedTime 出口

左键 -> IBAction playOrPauseSound

右键 -> IBAction stopSound

现在连接已经建立，我们可以在 ViewController.m 中完成我们的代码。在界面部分添加以下属性

@property (nonatomic, strong) AVAudioPlayer *audioPlayer;
@property (nonatomic) BOOL isPlaying; 
@property (nonatomic, strong) NSTimer *timer;

转到 ViewController.m 并在接口部分添加以下插座属性和 IBAction 方法定义。

@interface ViewController () 

@property (nonatomic, strong) IBOutlet UILabel *trackTitle;
@property (nonatomic, strong) IBOutlet UILabel *playedTime;

- (IBAction)stopSound:(id)sender; 
- (IBAction)playOrPauseSound:(id)sender;

@end

改变viewDidLoad方法：

- (void)viewDidLoad 
 
  [super viewDidLoad];

  self.view.backgroundColor = [UIColor whiteColor];
  self.isPlaying = NO; 
  self.trackTitle.text = @"The Stone Foxes - EveryBody Knows";

  NSBundle *mainBundle = [NSBundle mainBundle]; 
  NSString *filePath = [mainBundle pathForResource:@"thestonefoxes-everybodyknows" ofType:@"mp3"]; 
  NSData *fileData = [NSData dataWithContentsOfFile:filePath];

  NSError *error = nil;

  self.audioPlayer = [[AVAudioPlayer alloc] initWithData:fileData error:&error] 
    [self.audioPlayer prepareToPlay]; 



- (IBAction)playOrPauseSound:(id)sender; 
 
  if (self.isPlaying)
   
    // Music is currently playing 
    [self.audioPlayer pause]; 
    self.isPlaying = NO; 
   
  else 
   
    // Music is currenty paused/stopped 
    [self.audioPlayer play]; 
    self.isPlaying = YES;

    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTime) userInfo:nil repeats:YES]; 
   


- (void)updateTime 
 
  NSTimeInterval currentTime = self.audioPlayer.currentTime;

  NSInteger minutes = floor(currentTime/60);
  NSInteger seconds = trunc(currentTime - minutes * 60);

  // update your UI with currentTime; 
  self.playedTime.text = [NSString stringWithFormat:@"%d:%02d", minutes, seconds]; 


- (IBAction)stopSound:(id)sender 
 
  [self.audioPlayer stop];
  self.audioPlayer.currentTime = 0; 
  self.isPlaying = NO; 

【参考方案2】：

我已经在我的 Mac 上测试了您的代码，它似乎运行良好。可能是您的问题的原因是，虽然您的 mp3 在 Xcode 中可见，但在编译期间它没有被添加到包中。 Like in this question.

要修复它，请在 Xcode 中单击 mp3，查看 File Inspector 并选中目标旁边的 Target Membership 框（在屏幕截图中是 SOTest）。

【讨论】：

我也已经把mp3文件加到bundle里了，还是没有声音

您是否尝试过查看代码之外的内容，将 mp3 替换为另一个，甚至增加音量？

我把音量调到最大还是没有声音。但是，我使用了另一个剪辑（220 秒）并且它起作用了

我刚刚发现原因是文件扩展名是.wav，o我改变了它