UI-视频知识点总结

来源：互联网发布：php论坛网站源码编辑：程序博客网时间：2024/05/16 12:05

支持: .MP4、.mov、.mov、.m4v、.m2v、.3gp、.3g2

1.视频播放使用<MediaPlayer/MediaPlayer.h>不仅可以播放视频本地视频,也可以直接播放网络视频

2.MPMoviePlayerController 播放视频的类

3.(1)MPMoviePlayerController 上面播放视频的 view

(2)需要给它坐标还需要添加在某个视图上面

一.播放视频:

在ViewController.h里面导入播放视频的系统框架<MediaPlayer/MediaPlayer.h>

定义一个播放视频的全局变量

{

MPMoviePlayerController *moviePlayer;

}

初始化一个moviePlayer

先通过bundle目录找到视频资源

如:

NSString *path = [[NSBundle mainBundle]pathForResource:@"IMG_8435" ofType:@"m4v"];

UIImage *image = [self thumbnailImage:path];

self.view.backgroundColor = [UIColor colorWithPatternImage:image];

播放视频的类

moviePlayer = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL fileURLWithPath:path]];

还需要设置 moviePlayer.view的frame

moviePlayer.view.frame = self.view.frame;

moviePlayer.view.backgroundColor = [UIColor grayColor];

设置视频显示控制的样式

moviePlayer.controlStyle = MPMovieControlStyleEmbedded;

MPMovieRepeatModeNone 不循环

MPMovieRepeatModeOne 循环

设置视频是否循环播放

1.moviePlayer.repeatMode = MPMovieRepeatModeOne;

MPMovieControlStyleNone: 没有自带的控制栏

MPMovieControlStyleEmbedded:(默认)

moviePlayer.repeatMode = MPMovieControlStyleEmbedded;

*****需要把视频播放器的view添加在需要播放的视图上

[self.view addSubview:moviePlayer.view];

是否允许分享到airPlay

moviePlayer.allowsAirPlay = YES;

NSLog(@"是否使用了 airPlay %d",moviePlayer.airPlayVideoActive);

如果播放的是网络视频是否需要自动继续播放

moviePlayer.shouldAutoplay = YES;

设置视频全屏

moviePlayer.fullscreen = YES;

[moviePlayer setFullscreen:YES animated:YES];

播放

[moviePlayer play];

加载的状态: MPMovieLoadState

NSLog(@"是否全屏 %d",moviePlayer.isFullscreen);

MPMovieLoadStateUnknown = 0, 未知的状态

MPMovieLoadStatePlayable = 1 << 0, 可以播放的状态

MPMovieLoadStatePlaythroughOK = 1 << 1, Playback will be

automatically started in this state when shouldAutoplay is YES 如果使用了

shouldAutoplay == YES 有可以播放的自动播放

MPMovieLoadStateStalled = 1 << 2, 没有网络数据可以播放的时候

通知和截取图片:

截取图片:如果想使用AVAssetImageGenerator获得截图必须导入AVFoundation框架

AVAsset 通过URL 获得视频的资源

AVAssetImageGenerator 可以得到视频里面的图片

moviePlayer 可以通过通知来检测到视频播放的状态

MPMoviePlayerPlaybackStateDidChangeNotification

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(changeState:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:nil];

NSString *path = [[NSBundle mainBundle]pathForResource:@"IMG_8435" ofType:@"m4v"];

UIImage *image = [self thumbnailImage:path];

self.view.backgroundColor = [UIColor colorWithPatternImage:image];

- (void)changeState:(NSNotification *)not

{

NSLog(@"视频播放的当前时间%f",moviePlayer.currentPlaybackTime);

NSLog(@"%@",not.object);

可以获得整个视频播放的对象

MPMoviePlayerController *MP = not.object;

playbackState 只读的属性可以通过它来获取到视频播放的状态

NSLog(@"%ld",MP.playbackState);

MPMoviePlaybackStateStopped 停止

MPMoviePlaybackStatePlaying 播放

MPMoviePlaybackStatePaused 暂停

MPMoviePlaybackStateInterrupted 中断

MPMoviePlaybackStateSeekingForward 快进

MPMoviePlaybackStateSeekingBackward 快退

switch (MP.playbackState) {

case MPMoviePlaybackStateStopped:

NSLog(@"停止");

break;

case MPMoviePlaybackStatePlaying:

NSLog(@"播放");

break;

case MPMoviePlaybackStateInterrupted:

NSLog(@"中断");

break;

case MPMoviePlaybackStateSeekingForward:

NSLog(@"快进");

break;

case MPMoviePlaybackStateSeekingBackward:

NSLog(@"快退");

break;

case MPMoviePlaybackStatePaused:

NSLog(@"暂停");

break;

default:

break;

}

1. 通过moviePlayerController 获得截图的方法

MPMovieTimeOptionNearestKeyFrame 获得相对时间的截图

MPMovieTimeOptionExact 获得绝对时间的截图

[moviePlayer requestThumbnailImagesAtTimes:@[@(1),@(5)] timeOption: MPMovieTimeOptionNearestKeyFrame];

检测截图成功的通知

MPMoviePlayerThumbnailImageRequestDidFinishNotification

可以获得通知传过来内容的图片的key MPMoviePlayerThumbnailImageKey

}

*******FFMPEG VFL 转码的开源框架

- (UIImage *)thumbnailImage:(NSString *)path

{

1. 通过URL获得网址里面视频的资源

AVAsset

AVURLAsset

AVAsset *asset = [AVAsset assetWithURL:[NSURL fileURLWithPath:path]];

2.初始化视频资源图片的持有者

AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc]initWithAsset:asset];

3.开始截图

<(CMTime)>包含了时间的值

帧数

copyCGImageAtTime 拷贝哪个时间段的图片(包括了哪一帧)

CGImageRef 是图片的数据、参数

CGImageRef ref = [generator copyCGImageAtTime:CMTimeMake(1, 2) actualTime:nil error:nil];

CGImageRef 转换成UIImage

UIImage *image = [UIImage imageWithCGImage:ref];

return image;

}

0 0