AVPlayer

AVPlayer

• 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

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);
      }
  }

AVQueuePlayer

是AVPlayer的子类，有一个items属性

AVPlayerLayer