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：

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AVPlayer *mp3Player;

AVPlayerItem *mp3PlayerItem;

id audioMix;

id volumeMixInput;
2.在MM文件中：

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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];
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[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;
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[self.view.layer addSublayer:playerLayer];
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[self. mp3Player setAllowsExternalPlayback:YES];

3.实现代理方法：

 
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01.
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
02.
{
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if ([keyPath isEqualToString:@"status"])
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{
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if (AVPlayerItemStatusReadyToPlay == self. mp3Player.currentItem.status)
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{
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[self. mp3Player play];
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}
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}
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}

4.现实音量调整

 
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-(void) setVolume:(float)volume{
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//作品音量控制
03.
NSMutableArray *allAudioParams = [NSMutableArray array];
04.
AVMutableAudioMixInputParameters *audioInputParams =[AVMutableAudioMixInputParameters audioMixInputParameters];
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[audioInputParams setVolume:volume atTime:kCMTimeZero];
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[audioInputParams setTrackID:1];
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[allAudioParams addObject:audioInputParams];
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audioMix = [AVMutableAudioMix audioMix];
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[audioMix setInputParameters:allAudioParams];
10.
[self. mp3PlayerItem setAudioMix:audioMix]; // Mute the player item
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[avAudioPlayer setVolume:volume];
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}

5.取得播放时间

 
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01.
- (NSTimeInterval) playableDuration
02.
{
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AVPlayerItem * item = self.worksPlayer.currentItem;
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if (item.status == AVPlayerItemStatusReadyToPlay) {
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return CMTimeGetSeconds(self.worksPlayer.currentItem.duration);
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}
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else
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{
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return(CMTimeGetSeconds(kCMTimeInvalid));
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}
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}
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- (NSTimeInterval) playableCurrentTime
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{
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AVPlayerItem * item = self.worksPlayer.currentItem;
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if (item.status == AVPlayerItemStatusReadyToPlay) {
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NSLog(@"%f\n",CMTimeGetSeconds(self.worksPlayer.currentItem.currentTime));
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if (!playBeginState&&CMTimeGetSeconds(self.worksPlayer.currentItem.currentTime)==CMTimeGetSeconds(self.worksPlayer.currentItem.duration)) {
19.
[streamer stop];
20.
}
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playBeginState = NO;
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return CMTimeGetSeconds(self.worksPlayer.currentItem.currentTime);
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}
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else
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{
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return(CMTimeGetSeconds(kCMTimeInvalid));
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}
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}