AVPlayer

<span style="font-size:18px;">写了备注  就上传上来了，没什么东西。</span>////  ViewController.m//  MyPlayerDemo////  Created by JackYang on 15/9/22.//  Copyright (c) 2015年 JackYang. All rights reserved.//#import "ViewController.h"#import "VideoPlayView.h"#import <AVFoundation/AVFoundation.h>#define VIDEO_URL @"http://pl.youku.com/playlist/m3u8?vid=335318814&type=flv&ts=1442884618&keyframe=0&ep=cSaQGEGFUsgB7SXajD8bZCTic35aXP0J8xyEidpjBNQnS%2By6&sid=34428846186541238079e&token=3345&ctype=12&ev=1&oip=1760889091"@interface ViewController ()@property (weak, nonatomic) IBOutlet VideoPlayView *playView;@property (weak, nonatomic) IBOutlet UISlider *slider;//播放器，由他执行实际的播放@property(nonatomic)AVPlayer *player;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        self.slider.minimumValue = 0.0;    self.slider.maximumValue = 1.0;    self.slider.value        = 0.0;}- (IBAction)progressChanged:(id)sender {    //当前的进度百分比    float progress = self.slider.value;    CMTime totalTime = self.player.currentItem.duration;        //CMTimeMultiplyByFloat64 把一个CMTime值乘以一个浮点数    [self.player seekToTime:CMTimeMultiplyByFloat64(totalTime, progress)];}- (IBAction)play:(id)sender {    if(self.player != nil){        //对于处于播放状态的播放器，再次调用play无影响        [self.player play];        return;    }        NSString *videoPath = [[NSBundle mainBundle]pathForResource:@"1" ofType:@"mp4"];        //AVURLAsset 代表一个播放的资源，可以使音频，可以是视频，可以是本地的，也可以是网络的    //加载本地资源[NSURL fileURLWithPath:videoPath]    AVURLAsset *localAsset = [AVURLAsset assetWithURL:[NSURL fileURLWithPath:videoPath]];    //加载网络资源用[NSURL URLWithString:VIDEO_URL]    AVURLAsset *netAsset = [AVURLAsset assetWithURL:[NSURL URLWithString:VIDEO_URL]];        //AVPlayerItem 是对资源的整体描述，可以获取资源的状态，可以得到资源长度等信心，使用AVURLAsset进行初始化    AVPlayerItem *playerItem = [[AVPlayerItem alloc]initWithAsset:netAsset];        //生成播放器，使用AVPlayerItem进行初始化的时候，会对资源进行预加载分析    //这个过程会修改playerItem的状态    self.player = [AVPlayer playerWithPlayerItem:playerItem];        //图像显示，需要播放器和layer关联起来    [self.playView setPlayer:self.player];        //使用kvo来检测playerItem 的状态信息，只有当状态变为ReadToPlay才可以播放资源    [playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];        //关注播放结束的通知,关注通知AVPlayerItemDidPlayToEndTimeNotification    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];}- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{    __weak typeof(self) weakSelf = self;    if ([keyPath isEqualToString:@"status"]) {        AVPlayerItem *playerItem = (AVPlayerItem*)object;        if( playerItem.status == AVPlayerItemStatusReadyToPlay )        {            //资源已经准备好播放            [self.player play];                        //AVPlayer 提供了一种可以让我们周期性调用的一个block,在该block内我们可以实现进度的更新            //AVPlayer 使用CMTime表示时间，不直接使用秒数，是考虑到播放的速率            //value/timescale = seconds.            //CMTime(1,1);  均可以表示1秒，但是播放速率不一样            //CMTime(2,2);            [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {                //block中的time代表当前的播放时间                                //通过player.currentItem.duration 得到当前的总时长                CMTime totalTime = weakSelf.player.currentItem.duration;                //time/totalTime                //CMTimeGetSeconds 把CMTime转化为秒数               Float64 currentSeconds = CMTimeGetSeconds(time);               Float64 totalSeconds = CMTimeGetSeconds(totalTime);               float progress = currentSeconds*1.0/totalSeconds;               weakSelf.slider.value = progress;            }];        }else{            NSLog(@"资源不能播放");        }    }}- (void)playEnd:(NSNotification*)notify{    NSLog(@"检测到播放结束");}- (IBAction)pause:(id)sender {    [self.player pause];}- (NSUInteger)supportedInterfaceOrientations{    return UIInterfaceOrientationMaskAll;}- (void)stopPlay{    //先移除观察者    [self.player.currentItem removeObserver:self forKeyPath:@"status"];    //暂停    [self.player pause];    //释放掉self.player    self.player = nil;}//屏幕旋转调用的方法- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{    //UIInterfaceOrientationIsLandscape 判断是否为横屏模式    if(UIInterfaceOrientationIsLandscape(fromInterfaceOrientation))    {        //竖屏模式        self.playView.frame = CGRectMake(0, 30, 375, 225);        AVPlayerLayer *layer = (AVPlayerLayer*)self.playView.layer;        layer.videoGravity = AVLayerVideoGravityResizeAspect;    }else{        //横评模式        self.playView.frame = CGRectMake(0, 0, 667, 375);        AVPlayerLayer *layer = (AVPlayerLayer*)self.playView.layer;        layer.videoGravity = AVLayerVideoGravityResizeAspect;    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end