如何插入头信息进入的MPMoviePlayerController网址是什么？(How to ins

我需要实现与HTTP协议的视频流媒体服务。我知道如何设置网址的MPMoviePlayerController，以及如何设置headerField到NSMutableURLRequest，但我不知道如何将它们结合起来。我实现诸如下面的代码，但没有工作，我认为这是因为在二进制数据没有文件信息。

- (void) openUrl
{
    NSMutableURLRequest *reqURL = [NSMutableURLRequest requestWithURL:
                               [NSURL URLWithString:@"http://111.222.33.44/MOV/2013/4/123123123"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];

    [reqURL setHTTPMethod:@"GET"];
    [reqURL setValue:@"Mozilla/4.0 (compatible;)" forHTTPHeaderField:@"User-Agent"];
    [reqURL setValue:@"AAA-bb" forHTTPHeaderField:@"Auth-Token"];
    [reqURL setValue:@"bytes=0-1024" forHTTPHeaderField:@"Range"];
    [reqURL setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

    [NSURLConnection connectionWithRequest:reqURL delegate:self];

}


- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{    
    NSLog(@"Received");
    NSError * jsonERR = nil;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"myMove.ts"];

    [data writeToFile:path atomically:YES];
    NSLog(@"copied");
    NSURL *moveUrl = [NSURL fileURLWithPath:path];

    MPMoviePlayerController *player = [[MPMoviePlayerController alloc]init];
    [player setContentURL:moveUrl];
    player.view.frame = self.view.bounds;
    player.controlStyle = MPMovieControlStyleEmbedded;
    [self.view addSubview:player.view];
    [player play];
}

我证实了存在的委托方法的数据，但我不知道怎么玩它。请有人让我知道怎么玩它。验证令牌和范围是必要的参数。

谢谢。

Answer 1:

这是真的，苹果并不暴露一个简单的方法来注入头成MPMoviePlayerController的要求。随着一点点的努力，你可以得到这个使用自定义完成NSURLProtocol 。所以，让我们开始吧！

MyCustomURLProtocol.h：

@interface MyCustomURLProtocol : NSURLProtocol <NSURLConnectionDelegate, NSURLConnectionDataDelegate>

@property (nonatomic, strong) NSURLConnection* connection;

@end

MyCustomURLProtocol.m：

@implementation  MyCustomURLProtocol

// Define which protocols you want to handle
// In this case, I'm only handling "customProtocol" manually
// Everything else, (http, https, ftp, etc) is handled by the system
+ (BOOL) canInitWithRequest:(NSURLRequest *)request {
    NSURL* theURL = request.URL;
    NSString* scheme = theURL.scheme;
    if([scheme isEqualToString:@"customProtocol"]) {
        return YES;
    }
    return NO;
}

// You could modify the request here, but I'm doing my legwork in startLoading
+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
    return request;
}

// I'm not doing any custom cache work
+ (BOOL) requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b {
    return [super requestIsCacheEquivalent:a toRequest:b];
}

// This is where I inject my header
// I take the handled request, add a header, and turn it back into http
// Then I fire it off
- (void) startLoading {
    NSMutableURLRequest* mutableRequest = [self.request mutableCopy];
    [mutableRequest setValue:@"customHeaderValue" forHTTPHeaderField:@"customHeaderField"];

    NSURL* newUrl = [[NSURL alloc] initWithScheme:@"http" host:[mutableRequest.URL host] path:[mutableRequest.URL path]];
    [mutableRequest setURL:newUrl];

    self.connection = [NSURLConnection connectionWithRequest:mutableRequest delegate:self];
}

- (void) stopLoading {
    [self.connection cancel];
}

// Below are boilerplate delegate implementations
// They are responsible for letting our client (the MPMovePlayerController) what happened

- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    [self.client URLProtocol:self didFailWithError:error];
    self.connection = nil;
}

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.client URLProtocol:self didLoadData:data];
}

- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
}

- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
    [self.client URLProtocolDidFinishLoading:self];
    self.connection = nil;
}

@end

在您可以使用自定义URL协议，你必须注册。在您的AppDelegate.m：

#import "MyCustomURLProtocol.h"

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // ... Your normal setup ...

    [NSURLProtocol registerClass:[MyCustomURLProtocol class]];

    return YES;
}

最后，你需要用户与MPMediaPlayerController您的自定义URL协议。

NSString* theURLString = [NSString stringWithFormat:@"customProtocol://%@%@", [_url host],[_url path]];
_player = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:theURLString]];

在现在的MPMoviePlayerController将尝试建立与请求customProtocol://而不是普通http:// 。使用这种设置，我们然后截取这个请求，添加我们的头，把它变成HTTP，再火的一切了。