IJKMediaPlayback

pragma mark - IJKMediaPlayback

#pragma mark 通知
 IJKMPMediaPlaybackIsPreparedToPlayDidChangeNotification; // 播放状态的改变 代替 MPMoviePlayerContentPreloadDidFinishNotification

 IJKMPMoviePlayerScalingModeDidChangeNotification; // 缩放比例的改变

 IJKMPMoviePlayerPlaybackDidFinishNotification;
 IJKMPMoviePlayerPlaybackDidFinishReasonUserInfoKey; // NSNumber (IJKMPMovieFinishReason)
 当电影播放结束或用户退出播放时调用。

 IJKMPMoviePlayerPlaybackStateDidChangeNotification; // 用户改变播放状态改变时调用
 IJKMPMoviePlayerLoadStateDidChangeNotification; // 当网络加载状态发生变化时。
 IJKMPMoviePlayerIsAirPlayVideoActiveDidChangeNotification; // 当视频通过 AirPlay 开始播放视频或结束时调用

 Movie Property Notifications
 属性相关的同时声明
 IJKMPMovieNaturalSizeAvailableNotification; // 在执行 prepareToPlay 时开始异步确定影片属性，当相关属性变为有效可用时调用该通知
 IJKMPMoviePlayerVideoDecoderOpenNotification; // 视频 编译器打开通知
 IJKMPMoviePlayerFirstVideoFrameRenderedNotification; // 视频 视频第一帧时通知
 IJKMPMoviePlayerFirstAudioFrameRenderedNotification; // 视频 音频第一段时通知

#pragma mark 枚举
typedef NS_OPTIONS(NSUInteger, IJKMPMovieLoadState) {
    IJKMPMovieLoadStateUnknown        = 0, // 未知状态
    IJKMPMovieLoadStatePlayable       = 1 << 0, //
    IJKMPMovieLoadStatePlaythroughOK  = 1 << 1, // 当shouldAutoPlay 为Yes时，将开始在这种状态
    IJKMPMovieLoadStateStalled        = 1 << 2, // 播放后，自动设定为该方法
};

typedef NS_ENUM(NSInteger, IJKMPMoviePlaybackState) {
    IJKMPMoviePlaybackStateStopped, // 播放停止
    IJKMPMoviePlaybackStatePlaying, // 开始播放
    IJKMPMoviePlaybackStatePaused,  // 暂停播放
    IJKMPMoviePlaybackStateInterrupted, // 播放间断
    IJKMPMoviePlaybackStateSeekingForward, // 播放快进
    IJKMPMoviePlaybackStateSeekingBackward // 播放后退
};

typedef NS_ENUM(NSInteger, IJKMPMovieScalingMode) {
    IJKMPMovieScalingModeNone,       // 没有缩放比例
    IJKMPMovieScalingModeAspectFit,  //尺寸比例不变填满屏幕为止
    IJKMPMovieScalingModeAspectFill, // 尺寸比例不变填满屏幕，可能造成内容缺少
    IJKMPMovieScalingModeFill        // 尺寸比例变形也会填满屏幕
};


    int reason =[[[notification userInfo] valueForKey:IJKMPMoviePlayerPlaybackDidFinishReasonUserInfoKey] intValue];
用于IJKMPMoviePlayerPlaybackDidFinishReasonUserInfoKey通知中，判断reason为一枚举
typedef NS_ENUM(NSInteger, IJKMPMovieFinishReason) {
    IJKMPMovieFinishReasonPlaybackEnded, // 完成原因：播放结束
    IJKMPMovieFinishReasonPlaybackError, // 完成原因：播放出现错误
    IJKMPMovieFinishReasonUserExited // 完成原因：出现用户行为退出
};


 Thumbnails （缩略图）
获取在指定播放时间的视频缩略图，第一个参数是获取缩略图的时间点数组；第二个参数代表时间点精度，枚举类型
typedef NS_ENUM(NSInteger, IJKMPMovieTimeOption) {
    IJKMPMovieTimeOptionNearestKeyFrame, // 时间点附近
    IJKMPMovieTimeOptionExact //准确时间
};

#pragma mark Attribute & Method
- (void)prepareToPlay; // 播放准备
- (void)play; // 播放
- (void)pause; // 暂停
- (void)stop; // 停止播放
- (BOOL)isPlaying; // 是否正在播放中
- (void)setPauseInBackground:(BOOL)pause; // 后台暂停
- (void)shutdown;  // ******这句要写在viewDidDisappear中，否则可能会造成vc不会被释放******

@property(nonatomic, readonly)  UIView *view; // 用于显示视频播放的view，调用次view
@property(nonatomic)            NSTimeInterval currentPlaybackTime; // 当前播放的时间点
@property(nonatomic, readonly)  NSTimeInterval duration; // 总时长
@property(nonatomic, readonly)  NSTimeInterval playableDuration; // 可播放时长
@property(nonatomic, readonly)  NSInteger bufferingProgress; // 缓冲进度

@property(nonatomic, readonly)  BOOL isPreparedToPlay; // 准备播放
@property(nonatomic, readonly)  IJKMPMoviePlaybackState playbackState; // 播放终止状态枚举
@property(nonatomic, readonly)  IJKMPMovieLoadState loadState; // 加载状态枚举

@property(nonatomic, readonly) int64_t numberOfBytesTransferred; // 传输字节数

@property(nonatomic, readonly) CGSize naturalSize; // 视频原始显示View size，
@property(nonatomic) IJKMPMovieScalingMode scalingMode; // 视频尺寸模式
@property(nonatomic) BOOL shouldAutoplay; // 需要自动播放

@property (nonatomic) BOOL allowsMediaAirPlay; // 支持AirPlay 媒体
@property (nonatomic) BOOL isDanmakuMediaAirPlay; // 支持弹幕AirPlay媒体
@property (nonatomic, readonly) BOOL airPlayMediaActive; //AirPlay 是否活跃

@property (nonatomic) float playbackRate;  // 返回音频/视频的当前播放速度 0-1


- (UIImage *)thumbnailImageAtCurrentTime; //获取当前时间的封面帧图片

IJKMediaUrlOpenDelegate && IJKMediaUrlOpenData

typedef NS_ENUM(NSInteger, IJKMediaUrlOpenType) {
    IJKMediaUrlOpenEvent_ConcatResolveSegment = 0x10000,
    IJKMediaUrlOpenEvent_TcpOpen = 0x10001,
    IJKMediaUrlOpenEvent_HttpOpen = 0x10002,
    IJKMediaUrlOpenEvent_LiveOpen = 0x10004,
};

- (id)initWithUrl:(NSString *)url
openType:(IJKMediaUrlOpenType)openType
segmentIndex:(int)segmentIndex
retryCounter:(int)retryCounter;

@property(nonatomic, readonly) IJKMediaUrlOpenType openType;
@property(nonatomic, readonly) int segmentIndex;
@property(nonatomic, readonly) int retryCounter; // 重试次数

@property(nonatomic, retain) NSString *url;
@property(nonatomic) int error; // 错误提示，发生错误该属性为负
@property(nonatomic, getter=isHandled)    BOOL handled;     // 如果url发生改变，该数值变为Yes
@property(nonatomic, getter=isUrlChanged) BOOL urlChanged;  // 通过改变url设置为YES

IJKMediaModule

@property(atomic, getter=isAppIdleTimerDisabled)            BOOL appIdleTimerDisabled; // 如果不希望在运行程序时锁屏 ，设置为YES
@property(atomic, getter=isMediaModuleIdleTimerDisabled)    BOOL mediaModuleIdleTimerDisabled;

IJKFFOptions

typedef enum IJKFFOptionCategory {
    kIJKFFOptionCategoryFormat = 1,
    kIJKFFOptionCategoryCodec  = 2,
    kIJKFFOptionCategorySws    = 3,
    kIJKFFOptionCategoryPlayer = 4,
} IJKFFOptionCategory;


// 解码器选项 skip_loop_filter & skip_frame
typedef enum IJKAVDiscard {
    /* We leave some space between them for extensions (drop some
     * keyframes for intra-only or drop just some bidir frames). */
    IJK_AVDISCARD_NONE    =-16, ///< discard nothing
    IJK_AVDISCARD_DEFAULT =  0, ///< 如果包大小为0，责抛弃无效的包
    IJK_AVDISCARD_NONREF  =  8, ///< 抛弃非参考帧（I帧）
    IJK_AVDISCARD_BIDIR   = 16, ///< 抛弃B帧
    IJK_AVDISCARD_NONKEY  = 32, ///< 抛弃除关键帧以外的，比如B，P帧
    IJK_AVDISCARD_ALL     = 48, ///< 抛弃所有的帧
} IJKAVDiscard;


+(IJKFFOptions *)optionsByDefault;  //初始化用

-(void)applyTo:(struct IjkMediaPlayer *)mediaPlayer;

- (void)setOptionValue:(NSString *)value forKey:(NSString *)key ofCategory:(IJKFFOptionCategory)category;

- (void)setOptionIntValue:(int64_t)value forKey:(NSString *)key ofCategory:(IJKFFOptionCategory)category;


-(void)setFormatOptionValue:       (NSString *)value forKey:(NSString *)key;
-(void)setCodecOptionValue:        (NSString *)value forKey:(NSString *)key;
-(void)setSwsOptionValue:          (NSString *)value forKey:(NSString *)key;
-(void)setPlayerOptionValue:       (NSString *)value forKey:(NSString *)key;

-(void)setFormatOptionIntValue:    (int64_t)value forKey:(NSString *)key;
-(void)setCodecOptionIntValue:     (int64_t)value forKey:(NSString *)key;
-(void)setSwsOptionIntValue:       (int64_t)value forKey:(NSString *)key;
-(void)setPlayerOptionIntValue:    (int64_t)value forKey:(NSString *)key; // value:1 forKey:@"videotoolbox"；开启硬件解码

@property(nonatomic) BOOL useRenderQueue; // 使用渲染队列
@property(nonatomic) BOOL showHudView; // 显示加载指示器视图

由Options 中可得知它的所有属性
start-on-prepared （开始准备）；
overlay-format、max-fps（最大fps）；
framedrop（跳帧开关：当cpu过慢时进行帧降低处理）；
videotoolbox-max-frame-width（指定最大宽度）；
videotoolbox（解码模式 0:软解、1:硬解码）；
video-pictq-size ；
ijkinject-opaque；
user-agent ；
auto_convert（自动转屏开关）；
timeout(超时时间)；
reconnect （重连次数）；
safe ；
skip_frame；
skip_loop_filter；

全部参数查看ijkplayer 中 ：
//60行 static const AVOption ffp_context_options[]