IOS利用AVPlayer开发多媒体在线播放器

在这里给AVPlayer播放在线音频文件作个记号1.在H文件中初始：==============AVPlayer *mp3Player;AVPlayerItem *mp3PlayerItem;id audioMix;id volumeMixInput;2.在MM文件中：view
sourceprint?

01.

//作品播放

02.

NSURL
* songUrl = [NSURL URLWithString:userInfo.songUrl];

03.

AVURLAsset
*movieAsset    = [[[AVURLAsset alloc]initWithURL:songUrl options:nil]autorelease];

04.

05.

06.

self.
mp3PlayerItem = [AVPlayerItem playerItemWithAsset:movieAsset];

07.

[self.
mp3PlayerItem addObserver:self forKeyPath:@

"status"

options:

0

context:NULL];

08.

self.
mp3Player = [AVPlayer playerWithPlayerItem:self. mp3PlayerItem];

09.

AVPlayerLayer
*playerLayer = [AVPlayerLayer playerLayerWithPlayer:self. mp3Player];

10.

playerLayer.frame
= self.view.layer.bounds;

11.

playerLayer.videoGravity
= AVLayerVideoGravityResizeAspect;

12.

[self.view.layer
addSublayer:playerLayer];

13.

[self.
mp3Player setAllowsExternalPlayback:YES];

3.实现代理方法：view
sourceprint?

01.

-
(

void

)observeValueForKeyPath:(NSString
*)keyPath ofObject:(id)object change:(NSDictionary *)change context:(

void

*)context

02.

{

03.

if

([keyPath
isEqualToString:@

"status"

])

04.

{

05.

if

(AVPlayerItemStatusReadyToPlay
== self. mp3Player.currentItem.status)

06.

{

07.

[self.
mp3Player play];

08.

}

09.

}

10.

}

4.现实音量调整view
sourceprint?

01.

-(

void

)
setVolume:(

float

)volume{

02.

//作品音量控制

03.

NSMutableArray
*allAudioParams = [NSMutableArray array];

04.

AVMutableAudioMixInputParameters
*audioInputParams =[AVMutableAudioMixInputParameters audioMixInputParameters];

05.

[audioInputParams
setVolume:volume atTime:kCMTimeZero];

06.

[audioInputParams
setTrackID:

1

];

07.

[allAudioParams
addObject:audioInputParams];

08.

audioMix
= [AVMutableAudioMix audioMix];

09.

[audioMix
setInputParameters:allAudioParams];

10.

[self.
mp3PlayerItem setAudioMix:audioMix];

//
Mute the player item

11.

12.

[avAudioPlayer
setVolume:volume];

13.

}

5.取得播放时间view
sourceprint?

01.

-
(NSTimeInterval) playableDuration

02.

{

03.

AVPlayerItem
* item = self.worksPlayer.currentItem;

04.

if

(item.status
== AVPlayerItemStatusReadyToPlay) {

05.

return

CMTimeGetSeconds(self.worksPlayer.currentItem.duration);

06.

}

07.

else

08.

{

09.

return

(CMTimeGetSeconds(kCMTimeInvalid));

10.

}

11.

}

12.

-
(NSTimeInterval) playableCurrentTime

13.

{

14.

AVPlayerItem
* item = self.worksPlayer.currentItem;

15.

16.

if

(item.status
== AVPlayerItemStatusReadyToPlay) {

17.

NSLog(@

"%f\n"

,CMTimeGetSeconds(self.worksPlayer.currentItem.currentTime));

18.

if

(!playBeginState&&CMTimeGetSeconds(self.worksPlayer.currentItem.currentTime)==CMTimeGetSeconds(self.worksPlayer.currentItem.duration))
{

19.

[streamer
stop];

20.

}

21.

playBeginState
= NO;

22.

return

CMTimeGetSeconds(self.worksPlayer.currentItem.currentTime);

23.

}

24.

else

25.

{

26.

return

(CMTimeGetSeconds(kCMTimeInvalid));

27.

}

28.

}