IJKPlayer的基本使用方法

过去学习过如何扒代码，但是不明白为什么要去扒代码，后来工作之后也是慢慢的理解了；
还有就是学习别人写好的第三方框架，过去也不知道如何使用，慢慢的发现原来是看别人的源码;
不得不说，畅不在我身边之后，所有的事都要我自己扛，看英文文档，学习第三方使用，替换pod等等~
话说，看别人的demo，通读源码让人成长的真快~
也很感谢我离开了他的帮助，这让我一直再去独立成长，但也要非常感谢他曾经给我的帮助~

闲话少说，我们看看IJKPlayer的基本用法

首先还是要去看人家的demo，ijkplayer下载连接,然后运行脚本，看看demo中的内容,比较重要的是IJKFFMoviePlayerController这个控制器，就是直接给他一个url，就可以播放了，真心非常优秀的播放框架！

看看源码

先要知道，白色的view叫做 MLLivePlayerCell,红色的叫做MLCatEarView
首先要知道，MLLivePlayerCell的播放器，是有声音的，并且我们做直播，最好要自己去控制他的播放时间，这要的效果比较好

#define EXPECTED_IJKPLAYER_VERSION (1 << 16) & 0xFF) | 
- (void)viewDidLoad
{
    [super viewDidLoad];
    
//先去设置一下是否打印log，有利于我们去查看信息，但是正式情况下，最好关闭打印
#ifdef DEBUG
    [IJKFFMoviePlayerController setLogReport:YES];
    [IJKFFMoviePlayerController setLogLevel:k_IJK_LOG_DEBUG];
#else
    [IJKFFMoviePlayerController setLogReport:NO];
    [IJKFFMoviePlayerController setLogLevel:k_IJK_LOG_INFO];
#endif

    [IJKFFMoviePlayerController checkIfFFmpegVersionMatch:YES];
    // [IJKFFMoviePlayerController checkIfPlayerVersionMatch:YES major:1 minor:0 micro:0];
  
    
    //这个一定要有，options 是对数据的处理，videotoolbox解码，设置音频视频等属性，都要有这个数据
    IJKFFOptions *options = [IJKFFOptions optionsByDefault];
    //设置解码的方式
    [options setPlayerOptionIntValue:1  forKey:@"videotoolbox"];
    
    // 帧速率(fps) （可以改，确认非标准桢率会导致音画不同步，所以只能设定为15或者29.97）
    [options setPlayerOptionIntValue:29.97 forKey:@"r"];
    // -vol——设置音量大小，256为标准音量。（要设置成两倍音量时则输入512，依此类推
    [options setPlayerOptionIntValue:512 forKey:@"vol"];

    self.player = [[IJKFFMoviePlayerController alloc] initWithContentURL:self.url withOptions:options];
    self.player.view.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
    self.player.view.frame = self.view.bounds;
    self.player.scalingMode = IJKMPMovieScalingModeAspectFit;
    //如果是直播，最好不让他自动播放，如果YES，那么就会自动播放电影，不需要通过[self.player play];就可以播放了，
    //但是如果NO，我们需要注册通知，然后到响应比较合适的地方去检测通知，然后必须通过[self.player play];手动播放
    self.player.shouldAutoplay = NO;

    self.view.autoresizesSubviews = YES;
    //player是个控制器，所以要吧他的view加载到self.view上
    [self.view addSubview:self.player.view];
    [self.view addSubview:self.mediaControl];

    self.mediaControl.delegatePlayer = self.player;
}

注册通知，准备播放，移除通知

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    [self installMovieNotificationObservers];

    [self.player prepareToPlay];
}

- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    
    [self.player shutdown];
    [self removeMovieNotificationObservers];
}


#pragma mark Install Movie Notifications

/* Register observers for the various movie object notifications. */
-(void)installMovieNotificationObservers
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(loadStateDidChange:)
                                                 name:IJKMPMoviePlayerLoadStateDidChangeNotification
                                               object:_player];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(moviePlayBackDidFinish:)
                                                 name:IJKMPMoviePlayerPlaybackDidFinishNotification
                                               object:_player];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(mediaIsPreparedToPlayDidChange:)
                                                 name:IJKMPMediaPlaybackIsPreparedToPlayDidChangeNotification
                                               object:_player];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(moviePlayBackStateDidChange:)
                                                 name:IJKMPMoviePlayerPlaybackStateDidChangeNotification
                                               object:_player];
}

#pragma mark Remove Movie Notification Handlers

/* Remove the movie notification observers from the movie object. */
-(void)removeMovieNotificationObservers
{
    [[NSNotificationCenter defaultCenter]removeObserver:self name:IJKMPMoviePlayerLoadStateDidChangeNotification object:_player];
    [[NSNotificationCenter defaultCenter]removeObserver:self name:IJKMPMoviePlayerPlaybackDidFinishNotification object:_player];
    [[NSNotificationCenter defaultCenter]removeObserver:self name:IJKMPMediaPlaybackIsPreparedToPlayDidChangeNotification object:_player];
    [[NSNotificationCenter defaultCenter]removeObserver:self name:IJKMPMoviePlayerPlaybackStateDidChangeNotification object:_player];
}

这个代码是喵播的代码，这个是具体的项目中可能用到的东西,一般就注册2个通知就好了，可以监听到所需要的事情

- (void)stateDidChange
{
    if ((self.moviePlayer.loadState & IJKMPMovieLoadStatePlaythroughOK) != 0) {
        if (!self.moviePlayer.isPlaying) {
//监听到了改变，判断是不是没有播放，然后播放，因为之前设置的时候，『自动播放=NO』,所以要在这里去给手动播放
            [self.moviePlayer play];
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                if (_placeHolderView) {
                    [_placeHolderView removeFromSuperview];
                    _placeHolderView = nil;
                    [self.moviePlayer.view addSubview:_renderer.view];
                }
                [self.parentVc hideGufLoding];
            });
        }else{
            // 如果是网络状态不好, 断开后恢复, 也需要去掉加载
            if (self.parentVc.gifView.isAnimating) {
                dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                    [self.parentVc hideGufLoding];
                });
                
            }
        }
    }else if (self.moviePlayer.loadState & IJKMPMovieLoadStateStalled){ // 网速不佳, 自动暂停状态
        [self.parentVc showGifLoding:nil inView:self.moviePlayer.view];
    }
}

- (void)didFinish
{
    NSLog(@"加载状态...%ld %ld %s", self.moviePlayer.loadState, self.moviePlayer.playbackState, __func__);
    // 因为网速或者其他原因导致直播stop了, 也要显示GIF
    if (self.moviePlayer.loadState & IJKMPMovieLoadStateStalled && !self.parentVc.gifView) {
        [self.parentVc showGifLoding:nil inView:self.moviePlayer.view];
        return;
    }
//    方法：
//      1、重新获取直播地址，服务端控制是否有地址返回。
//      2、用户http请求该地址，若请求成功表示直播未结束，否则结束
    __weak typeof(self)weakSelf = self;
    [[ALinNetworkTool shareTool] GET:self.live.flv parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"请求成功%@, 等待继续播放", responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"请求失败, 加载失败界面, 关闭播放器%@", error);
        [weakSelf.moviePlayer shutdown];
        [weakSelf.moviePlayer.view removeFromSuperview];
        weakSelf.moviePlayer = nil;
        weakSelf.endView.hidden = NO;
    }];
}

self.moviePlayer.loadState & IJKMPMovieLoadStatePlaythroughOK这个代码，是与，请参考这个文档，位运算和枚举,我就不赘述了~

切记，就是我们在结束的时候，viewWillDisappear中，设置[self.player shutdown],停止播放和self.player = nil，移除播放器操作

看看MLCatEarView中的设置

这个view中要去静音（业务需求）,然后我们去设置代码

@interface MLCatEarView ()
@property(nonatomic,strong)IJKFFMoviePlayerController *moviePlayer;
@end
@implementation MLCatEarView
- (instancetype)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor redColor];
        self.layer.cornerRadius = 100*0.5;
        self.layer.masksToBounds = YES;
    }
    return self;
}

- (void)setLiveM:(MLLiveModel *)liveM{
    _liveM = liveM;
    
    IJKFFOptions *option = [IJKFFOptions optionsByDefault];
    //静音设置
    [option setPlayerOptionValue:@"1" forKey:@"an"];
    // 开启硬解码
    [option setPlayerOptionValue:@"1" forKey:@"videotoolbox"];
    
    IJKFFMoviePlayerController *moviePlayer = [[IJKFFMoviePlayerController alloc] initWithContentURLString:liveM.flv withOptions:option];
    self.moviePlayer = moviePlayer;
    [self addSubview:self.moviePlayer.view];
    self.moviePlayer.view.frame = self.bounds;
    self.moviePlayer.scalingMode = IJKMPMovieScalingModeAspectFill;

 //这里是自动播放，所以就没有[self.player play]这句话~
    self.moviePlayer.shouldAutoplay = YES;
    
    [self.moviePlayer prepareToPlay];
}

- (void)removeFromSuperview
{
    if (_moviePlayer) {
        [_moviePlayer shutdown];
        [_moviePlayer.view removeFromSuperview];
        _moviePlayer = nil;
    }
    [super removeFromSuperview];
}

就这样写完了，有机会还是要看看源码，这样对自己的提升还是很大的，过去我学习一个框架，就是别人的博客，但是相比看源码，理解的还是有些偏差~