AVPlayer 基础用法

刺骨的言语ヽ痛彻心扉 2022-09-24 04:27 10阅读 0赞

转载地址：     http://www.jianshu.com/p/44e7cd7af180

#import "ViewController.h"
    #import <AVFoundation/AVFoundation.h>
    
    @interface ViewController ()
    
    @property (nonatomic,strong) AVPlayer  *player;
    @property (nonatomic,strong) AVPlayerItem *playerItem;
    
    @property (nonatomic,assign) CGFloat totalMovieDuration;
    
    @end
    
    @implementation ViewController
    
    
    - (AVPlayer *)player{
        if (_player == nil) {
            _player = [AVPlayer playerWithPlayerItem:self.playerItem];
        }
        return _player;
    }
    
    
    - (AVPlayerItem *)playerItem{
        if (_playerItem == nil) {
            
          NSURL *url = [NSURL URLWithString:@"http://baobab.wdjcdn.com/14562919706254.mp4"];
            
    //        NSURL *url = [[NSBundle mainBundle] URLForResource:@"minion_01" withExtension:@"mp4"];
            
            _playerItem = [[AVPlayerItem alloc]initWithURL:url];
            
            
            // 通过KVO形式，来知道 AVPlayerItem(资源类)的状态和进度
             
            // 缓存
            [_playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];
            
            // 状态
            [_playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
            
        }
        return _playerItem;
    }
    
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        // 这个主要是用来处理显示视频的作用， 渲染作用。
        AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
        playerLayer.frame = self.view.bounds;
        [self.view.layer addSublayer:playerLayer];
        
        // 有所有Layer的所有属性值。
        playerLayer.borderColor = [UIColor redColor].CGColor;
        playerLayer.borderWidth = 2.0;
        
        
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            
              // 开始播放
              [_player play];
            
        });
        
    }
    
    
    
    - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
    {
        
        AVPlayerItem *item = (AVPlayerItem *)object;
        
        NSLog(@"keypath ---- > %@", keyPath);
        
        
        if ([keyPath isEqualToString:@"status"]) {
            /**
             
             *     AVPlayerItemStatusUnknown,播放源未知
             
             *     AVPlayerItemStatusReadyToPlay,播放源准备好
             
             *     AVPlayerItemStatusFailed播放源失败
             
             */
            
            AVPlayerStatus status= [[change objectForKey:@"new"]intValue];
            if (status == AVPlayerItemStatusReadyToPlay) { // 和资源对接成功后，就可以知道了资源的时间等信息。
                
                //转化时间的格式
                CMTime totalTime = item.duration;
                
                _totalMovieDuration= (CGFloat)totalTime.value/ totalTime.timescale;
                
                NSDate *d = [NSDate dateWithTimeIntervalSince1970:_totalMovieDuration];
                
                NSDateFormatter*formatter = [[NSDateFormatter alloc]init];
                
                if(_totalMovieDuration/3600>=1) {
                    
                    [formatter setDateFormat:@"HH:mm:ss"];
    
                }else{
                    
                    [formatter setDateFormat:@"mm:ss"];
                    
                }
                NSString *showtime = [formatter stringFromDate:d];
                NSLog(@"这个视频的时间---->%@", showtime);
            }
            
            
        }else if([keyPath isEqualToString:@"loadedTimeRanges"]){ // 缓存
           
            NSArray*array = item.loadedTimeRanges;
            NSLog(@"array = %@", array);
            
            //  本次缓冲时间范围
            
            CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];
            
            float startSeconds =CMTimeGetSeconds(timeRange.start);
            
            float durationSeconds =CMTimeGetSeconds(timeRange.duration);
            
            //  缓冲总长度
            
            NSTimeInterval totalBuffer = startSeconds + durationSeconds;
            
            NSLog(@"共缓冲：%.2f",totalBuffer); // 这个缓存是以时间为单位的。
            
            //
            CGFloat currentProgress =  (totalBuffer *1.0/_totalMovieDuration)*100;
            
            
            NSLog(@"当前的进度是---->%f",currentProgress); // 进度
            
        }
        
    }
    
    
    
    
    
    
    @end