IOS播放音频 AVAudioPlayer（实例）

1. AVFoundation

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

firstviewcontroller.h

1. #import <UIKit/UIKit.h>
2. #import <AVFoundation/AVFoundation.h>
3. @interface FirstViewController : UIViewController
4. {
5. __weak IBOutlet UILabel *label;
6. AVAudioPlayer *player;
7. }
8. - (IBAction)toplay:(id)sender;
9. @end

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

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

- (IBAction)toplay:(id)sender;

@end

firstviewcontroller.m

1. - (IBAction)toplay:(id)sender
2. {
3. NSURL  *url = [NSURL fileURLWithPath:[NSString  stringWithFormat:@"%@/test.mp3",  [[NSBundle mainBundle]  resourcePath]]];
4. NSError  *error;
5. player  = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
6. player.numberOfLoops = -1;
7. [player play];
8. [label setText:@"Play ..."];
9. }

- (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：

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

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

1. [player play];  //播放
2. [player pause]; //暂停
3. [player stop];  //停止

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

更多功能：

1. 音量：

1. player.volume=0.8;//0.0~1.0之间

player.volume=0.8;//0.0~1.0之间  

2. 循环次数

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

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

3.播放位置

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

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

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

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

4.声道数

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

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

5.持续时间

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

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

6.仪表计数

1. player.meteringEnabled = YES;//开启仪表计数功能
2. [ player updateMeters];//更新仪表读数
3. //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。
4. for(int i = 0; i<player.numberOfChannels;i++){
5. float power = [player averagePowerForChannel:i];
6. float peak = [player peakPowerForChannel:i];
7. }

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

1. [player prepareToPlay];

[player prepareToPlay];

8. 判断是否正在播放

1. [player isPlaying]

[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：

1. player.delegate = self;

player.delegate = self;  

1. - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer*)player successfully:(BOOL)flag{
2. //播放结束时执行的动作
3. }
4. - (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer*)player error:(NSError *)error{
5. //解码错误执行的动作
6. }
7. - (void)audioPlayerBeginInteruption:(AVAudioPlayer*)player{
8. //处理中断的代码
9. }
10. - (void)audioPlayerEndInteruption:(AVAudioPlayer*)player{
11. //处理中断结束的代码
12. }

- (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.****.net/xys289187120/article/details/6595919

http://blog.****.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

1. #import <UIKit/UIKit.h>
2. #import <AudioToolbox/AudioToolbox.h>
3. @interface FirstViewController : UIViewController
4. {
5. }
6. - (IBAction)toplay:(id)sender;
7. @end

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

@interface FirstViewController : UIViewController
{
}

- (IBAction)toplay:(id)sender;

@end

firstviewcontroller.m

1. - (IBAction)toplay:(id)sender
2. {
3. CFBundleRef mainBundle = CFBundleGetMainBundle();
4. CFURLRef soundFileURLRef;
5. soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"sound1", CFSTR ("wav"), NULL);
6. UInt32 soundID;
7. AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
8. AudioServicesPlaySystemSound(soundID);
9. }

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

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

视频：

http://www.youtube.com/watch?v=lSJhYx28Krg&feature=youtu.be

• MsicPlayer.zip (28.8 KB)