AVPlayer

AVPlayer

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• 初始化AVPlayer

    + (instancetype)playerWithURL:(NSURL *)URL;
  
    + (instancetype)playerWithPlayerItem:(AVPlayerItem *)item;
  
    - (instancetype)initWithURL:(NSURL *)URL;
  
    - (instancetype)initWithPlayerItem:(AVPlayerItem *)item;
  

• 媒体资源管理对象AVPlayerItem，每个AVPlayerItem对应一个视频资源

    NSString *urlStr=[NSString stringWithFormat:@"http://192.168.1.161/%i.mp4",videoIndex];
    urlStr =[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *url=[NSURL URLWithString:urlStr];
    AVPlayerItem *playerItem=[AVPlayerItem playerItemWithURL:url];
  

• 使用AVPlayerLayer展示AVPlayer:控制AVPlayerLayer来完成全屏等操作

        AVPlayerLayer *playerLayer=[AVPlayerLayer playerLayerWithPlayer:self.player];
    playerLayer.frame=self.container.frame;
    //playerLayer.videoGravity=AVLayerVideoGravityResizeAspect;//视频填充模式
    [self.container.layer addSublayer:playerLayer];
  

• 播放暂停方法

    - (void)play;
    - (void)pause;
  

• 通过属性rate了解播放状态

    如果rate为0说明是停止状态，1为正常状态 ；
    设置rate为0.0等同于pause方法，改为1.0等同于pause方法
  

• 通过属性status了解播放状态

    AVPlayerStatusUnknown,
    AVPlayerStatusReadyToPlay,
    AVPlayerStatusFailed 		
  

• 获得播放进度方法addPeriodicTimeObserverForInterval

    [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1.0, 1.0) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
    float current=CMTimeGetSeconds(time);
    float total=CMTimeGetSeconds([playerItem duration]);
    NSLog(@"当前已经播放%.2fs.",current);
    NSLog(@" 播放进度%.2fs.",current/total);
  

• 切换视频方法replaceCurrentItemWithPlayerItem

     还可以使用AVQueuePlayer处理播放列表切换
  

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AVPlayerItem

• 为AVPlayerItem添加视频播放完成通知AVPlayerItemDidPlayToEndTimeNotification

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:AVPlayerItemDidPlayToEndTimeNotification object:self.player.currentItem];
  

• 通过KVO监控AVPlayerItem的status、loadedTimeRanges属性来获得 视频加载情况、缓冲情况、播放情况

    -(void)addObserverToPlayerItem:(AVPlayerItem *)playerItem{
    	//监控状态属性，注意AVPlayer也有一个status属性，通过监控它的status也可以获得播放状态
    	[playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
    	//监控网络加载情况属性
    	[playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];
    }
    
    -(void)removeObserverFromPlayerItem:(AVPlayerItem *)playerItem{
    	[playerItem removeObserver:self forKeyPath:@"status"];
    	[playerItem removeObserver:self forKeyPath:@"loadedTimeRanges"];
    }
    
    -(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    	AVPlayerItem *playerItem=object;
    	if ([keyPath isEqualToString:@"status"]) {
    		AVPlayerStatus status= [[change objectForKey:@"new"] intValue];
    		if(status==AVPlayerStatusReadyToPlay){
        	NSLog(@"正在播放...，视频总长度:%.2f",CMTimeGetSeconds(playerItem.duration));
    	}
    	}else if([keyPath isEqualToString:@"loadedTimeRanges"]){
    		NSArray *array=playerItem.loadedTimeRanges;
    		CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次缓冲时间范围
    		float startSeconds = CMTimeGetSeconds(timeRange.start);
    		float durationSeconds = CMTimeGetSeconds(timeRange.duration);
    		NSTimeInterval totalBuffer = startSeconds + durationSeconds;//缓冲总长度
            NSLog(@"共缓冲：%.2f",totalBuffer);
    	}
    }
  

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AVQueuePlayer

是AVPlayer的子类，有一个items属性

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AVPlayerLayer

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