播放音频 AVAudioPlayer（实例）

播放音频 AVAudioPlayer（实例）

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
 }

  

 

 

参考：

http://blog.csdn.net/xys289187120/article/details/6595919

http://blog.csdn.net/iukey/article/details/7295962

 

视频：

http://www.youtube.com/watch?v=kCpw6iP90cY

 

 

2. AudioToolbox

 

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

 

firstviewcontroller.h

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

 @interface FirstViewController : UIViewController
 {
 }

 - (IBAction)toplay:(id)sender;

 @end

 

firstviewcontroller.m

 - (IBAction)toplay:(id)sender
 {
     CFBundleRef mainBundle = CFBundleGetMainBundle();
     CFURLRef soundFileURLRef;
     soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"sound1", CFSTR ("wav"), NULL);

     UInt32 soundID;
     AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
     AudioServicesPlaySystemSound(soundID);
 }