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