ios 播放声音

1. AVFoundation

 

Build Phases => Link Binary With Libraies => + => AVFoundation.framework => add

 

firstviewcontroller.h

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

@interface FirstViewController : UIViewController
{  
    __weak IBOutlet UILabel *label;
    AVAudioPlayer *player;
}

- (IBAction)toplay:(id)sender;

@end

 

firstviewcontroller.m

- (IBAction)toplay:(id)sender 
{
    NSURL  *url = [NSURL fileURLWithPath:[NSString  stringWithFormat:@"%@/test.mp3",  [[NSBundle mainBundle]  resourcePath]]];
    
    NSError  *error;
    player  = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
       
    player.numberOfLoops = -1;
    [player play];
    
    [label setText:@"Play ..."];
}

 

或者：

 

 

NSString *path = [[NSBundle mainBundle] pathForResource:@"sound" ofType:@"mp3"]; 
NSError  *error; 
player = [[AVAudioPlayer alloc]initWithContentsOfURL:[[NSURL alloc]initFileURLWithPath:path]error:&error]; 
[player prepareToPlay];
player.numberOfLoops = -1;
[player play];

 

test.mp3 拖放到 Supporting Files 文件夹。

 

播放，暂停和停止

[player play];  //播放
[player pause]; //暂停
[player stop];  //停止

 

更多功能：

 

1. 音量：

player.volume=0.8;//0.0~1.0之间  

 

2. 循环次数

player.numberOfLoops = 3;//默认只播放一次 负数（-1）为无限循环

 

3.播放位置

 

player.currentTime = 15.0;//可以指定从任意位置开始播放 

 

3.1 显示当前时间

 

NSLog(@"%f seconds played so  far", player.currentTime);

 

4.声道数

 

NSUInteger channels = player.numberOfChannels;//只读属性 

 

5.持续时间

 

NSTimeInterval duration = player.dueration;//获取采样的持续时间  

 

6.仪表计数

 

player.meteringEnabled = YES;//开启仪表计数功能
[ player updateMeters];//更新仪表读数
//读取每个声道的平均电平和峰值电平，代表每个声道的分贝数,范围在-100～0之间。
for(int i = 0; i<player.numberOfChannels;i++){
float power = [player averagePowerForChannel:i];
float peak = [player peakPowerForChannel:i];
}

 

7. 初始化播放器  

 

[player prepareToPlay];

 

8. 判断是否正在播放

 

[player isPlaying]

 

9、代理方法

 

          加入播放出现异常，或者被更高级别的系统任务打断，我们的程序还没来得及收场就挂了，怎么办?不急，我们可以通过几个委托方法很好地处理所有的情形。

首先给player设置委托是必须的：

  

player.delegate = self;  

 

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer*)player successfully:(BOOL)flag{
    //播放结束时执行的动作
}
- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer*)player error:(NSError *)error{
    //解码错误执行的动作
}
- (void)audioPlayerBeginInteruption:(AVAudioPlayer*)player{
    //处理中断的代码
}
- (void)audioPlayerEndInteruption:(AVAudioPlayer*)player{
    //处理中断结束的代码
}