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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