iOS中流媒体播放和下载韩俊强的博客-白红宇

iOS中关于流媒体的简介：介于下载本地播放与实时流媒体之间的一种播放形式，下载本地播放必须全部将文件下载完成后才能播放，而渐进式下载不必等到全部下载完成后再播放，它可以一边下载一边播放，在完成播放内容之后，整个文件会保存在手机上。

实时流媒体

实时流媒体是一边接收数据包一边播放，本地不保留文件副本，实时流式传输总是实时传送，可以实时实况转播，支持随机访问，用户可以快进或者快退以观看前面或后面的内容。实时流媒体传输必须保证数据包的传输速度大于文件的播放速度，否则用户看到的视频会出现暂停。当网络堵塞情况下视频质量会下降，所以要想保证视频的质量渐进式下载会更好一些。

下面是本人亲测的流媒体播放和下载教程：

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1.界面搭建（如图）

2.用到的第三方助手类（需要的可以微博互动或私信我）

下载地址：

3.开始项目－头文件及相关宏

LO_ViewController.h

#import 
    
     #import 
     
      #import "M3U8Handler.h"#import "VideoDownloader.h"#import "HTTPServer.h"@interface LO_ViewController : UIViewController
      
       @property (nonatomic, strong)HTTPServer * httpServer;@property (nonatomic, strong)VideoDownloader *downloader;@end

LO_ViewController.m

#import "LO_ViewController.h"@interface LO_ViewController ()@property (weak, nonatomic) IBOutlet UIProgressView *progressView;@property (weak, nonatomic) IBOutlet UILabel *progressLabel;@property (weak, nonatomic) IBOutlet UIButton *downloadButton;@property (weak, nonatomic) IBOutlet UIButton *clearButton;@end@implementation LO_ViewController- (void)viewDidLoad{    [super viewDidLoad];	// Do any additional setup after loading the view, typically from a nib.        //打开本地服务器    [self openHttpServer];        if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"isDownload"] boolValue]) {        [self.downloadButton setTitle:@"已完成" forState:UIControlStateNormal];        self.downloadButton.enabled = NO;        self.clearButton.enabled = YES;        M3U8Handler *handler = [[M3U8Handler alloc] init];        [handler praseUrl:[NSString stringWithFormat:@"http://v.youku.com/player/getM3U8/vid/XNjUxMTE4NDAw/type/mp4"]];        handler.playlist.uuid = @"XNjUxMTE4NDAw";        self.downloader = [[VideoDownloader alloc]initWithM3U8List:handler.playlist];        [self.downloader addObserver:self forKeyPath:@"clearCaches" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil]; // 判断是否清理缓存    }        }

#pragma mark - 打开本地服务器

- (void)openHttpServer{    self.httpServer = [[HTTPServer alloc] init];    [self.httpServer setType:@"_http._tcp."];  // 设置服务类型    [self.httpServer setPort:12345]; // 设置服务器端口            // 获取本地Library/Cache路径下downloads路径    NSString *webPath = [kLibraryCache stringByAppendingPathComponent:kPathDownload];    NSLog(@"-------------\nSetting document root: %@\n", webPath);	    // 设置服务器路径	[self.httpServer setDocumentRoot:webPath];    NSError *error;    	if(![self.httpServer start:&error])	{        NSLog(@"-------------\nError starting HTTP Server: %@\n", error);	}}

#pragma mark - 清理缓存- (IBAction)clearCaches:(id)sender {    [self.downloader cleanDownloadFiles];}

#pragma mark - 在线流媒体播放

- (IBAction)playStreamingMedia:(id)sender {        // 优酷视频m3u8新地址格式如下:http://pl.youku.com/playlist/m3u8?vid=XNjUxMTE4NDAw&type=mp4    // 如果上面的链接不可用，那么使用这个链接http://v.youku.com/player/getM3U8/vid/XNjUxMTE4NDAw/type/mp4，如果两个连接都不可以用的话，那么很大可能是优酷的服务器挂掉了    // 如果上面的两种格式都不行的话，考虑用这个格式，当然如果这个格式不行的话，是上面的，或者直接换个对应的m3u8的地址 http://pl.youku.com/playlist/m3u8?vid=162779600&ts=1407469897&ctype=12&token=3357&keyframe=1&sid=640746989782612d6cc70&ev=1&type=mp4&ep=dCaUHU2LX8YJ4ivdjj8bMyqxJ3APXP8M9BiCiNRiANQnS%2B24&oip=2043219268    NSURL *url = [[NSURL alloc] initWithString:@"http://pl.youku.com/playlist/m3u8?vid=162779600&ts=1407469897&ctype=12&token=3357&keyframe=1&sid=640746989782612d6cc70&ev=1&type=flv&ep=dCaUHU2LX8YJ4ivdjj8bMyqxJ3APXP8M9BiCiNRiANQnS%2B24&oip=2043219268"];    MPMoviePlayerViewController *player = [[MPMoviePlayerViewController alloc] initWithContentURL:url];        [self presentMoviePlayerViewControllerAnimated:player];    }

#pragma mark - 视频下载

- (IBAction)downloadStreamingMedia:(id)sender {        UIButton *downloadButton = sender;        // 获取本地Library/Cache路径    NSString *localDownloadsPath = [kLibraryCache stringByAppendingPathComponent:kPathDownload];    // 获取视频本地路径    NSString *filePath = [localDownloadsPath stringByAppendingPathComponent:@"XNjUxMTE4NDAw/movie.m3u8"];    NSFileManager *fileManager = [NSFileManager defaultManager];        // 判断视频是否缓存完成，如果完成则播放本地缓存    if ([fileManager fileExistsAtPath:filePath]) {        [downloadButton setTitle:@"已完成" forState:UIControlStateNormal];        downloadButton.enabled = NO;        }else{        M3U8Handler *handler = [[M3U8Handler alloc] init];        handler.delegate = self;        // 解析m3u8视频地址        [handler praseUrl:@"http://pl.youku.com/playlist/m3u8?vid=162779600&ts=1407469897&ctype=12&token=3357&keyframe=1&sid=640746989782612d6cc70&ev=1&type=flv&ep=dCaUHU2LX8YJ4ivdjj8bMyqxJ3APXP8M9BiCiNRiANQnS%2B24&oip=2043219268"];                // 开启网络指示器        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];    }}

#pragma mark - 播放本地缓存视频

- (IBAction)playVideoFromLocal:(id)sender {        NSString * playurl = [NSString stringWithFormat:@"http://127.0.0.1:12345/XNjUxMTE4NDAw/movie.m3u8"];    NSLog(@"本地视频地址-----%@", playurl);        // 获取本地Library/Cache路径    NSString *localDownloadsPath = [kLibraryCache stringByAppendingPathComponent:kPathDownload];    // 获取视频本地路径    NSString *filePath = [localDownloadsPath stringByAppendingPathComponent:@"XNjUxMTE4NDAw/movie.m3u8"];    NSFileManager *fileManager = [NSFileManager defaultManager];        // 判断视频是否缓存完成，如果完成则播放本地缓存    if ([fileManager fileExistsAtPath:filePath]) {        MPMoviePlayerViewController *playerViewController =[[MPMoviePlayerViewController alloc]initWithContentURL:[NSURL URLWithString: playurl]];        [self presentMoviePlayerViewControllerAnimated:playerViewController];    }    else{        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Sorry" message:@"当前视频未缓存" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alertView show];    }}#pragma mark -#pragma mark - 视频解析完成-(void)praseM3U8Finished:(M3U8Handler*)handler{    handler.playlist.uuid = @"XNjUxMTE4NDAw";    self.downloader = [[VideoDownloader alloc]initWithM3U8List:handler.playlist];    [self.downloader addObserver:self forKeyPath:@"currentProgress" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil]; // 设置观察者用来得到当前下载的进度    [self.downloader addObserver:self forKeyPath:@"clearCaches" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil]; // 判断是否清理缓存    self.downloader.delegate = self;    [self.downloader startDownloadVideo]; // 开始下载}

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#pragma mark - 通过观察者监控下载进度显示/缓存清理

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{    if ([keyPath isEqualToString:@"clearCaches"]) {        self.downloadButton.enabled = YES;        [self.downloadButton setTitle:@"下载" forState:UIControlStateNormal];        self.clearButton.enabled = NO;        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:NO] forKey:@"isDownload"];        [[NSUserDefaults standardUserDefaults] synchronize];        self.progressView.progress = 0.0;        self.progressLabel.text = [NSString stringWithFormat:@"%.2f%%", 0.0];    }else{        self.progressLabel.text = [NSString stringWithFormat:@"%.2f%%", 100 * [[change objectForKey:@"new"] floatValue]];        self.progressView.progress = [[change objectForKey:@"new"] floatValue];        if (self.progressView.progress == 1) {            [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:YES] forKey:@"isDownload"];            [self.downloadButton setTitle:@"已完成" forState:UIControlStateNormal];            [[NSUserDefaults standardUserDefaults] synchronize];            self.clearButton.enabled = YES;            self.downloadButton.enabled = NO;        }    }    }

#pragma mark - 视频解析失败-(void)praseM3U8Failed:(M3U8Handler*)handler{    NSLog(@"视频解析失败-failed -- %@",handler);    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"噢,NO~

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