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：

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:0context: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：

 

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

 

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

 

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.}