AVPlayer视频播放

1、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];

[self.view.layer addSublayer:playerLayer];

2、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，所以很多时候我们是通过判断rate == 0.0 来获取实际的播放状态

通过属性status了解播放状态

AVPlayerStatusUnknown,

AVPlayerStatusReadyToPlay,

AVPlayerStatusFailed

3、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);

4、为AVPlayerItem添加视频播放完成通知

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

5、为AVPlayerItem添加KVO来处理视频播放时候的变化

添加kvo事件

6、处理键值观察事件，当然最后要记得将观察者移除

-(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);

}

}