ios - iOS 6 上的 AVAssetResourceLoaderDelegate 协议(protocol)

我已经设法让 AVPlayer 与 AVAssetResourceLoaderDelegate 一起在 iOS 7 上播放 m4a 文件，但我无法在 iOS 上执行此操作6.

- (BOOL)resourceLoaderAVAssetResourceLoader *)resourceLoader
shouldWaitForLoadingOfRequestedResourceAVAssetResourceLoadingRequest *)loadingRequest

委托(delegate)方法被以下请求调用:

2014-05-12 15:14:58.798 AVPlayer-Delegate[661:1103] Requested data: {
    Range = "bytes=0-1";
    "X-Playback-Session-Id" = "5B64BE4E-442A-4A37-9263-04D22CDBCB28";
}

我按要求返回了前两个字节，但委托(delegate)方法不再被调用。我试图在传递的响应对象中提供各种 header ，但没有帮助。

这是我的实现:

- (BOOL)resourceLoaderAVAssetResourceLoader *)resourceLoader

shouldWaitForLoadingOfRequestedResourceAVAssetResourceLoadingRequest *)loadingRequest

{

    NSLog(@"Requested data: %@",

          loadingRequest.request.allHTTPHeaderFields);

    NSDictionary *headers = @{@"Content-Type": @"audio/x-m4a",

                              @"Accept-Ranges" : @"bytes",

                              @"Content-Length" : [NSString stringWithFormat"%d", 2],

                              @"Content-Range" : [NSString stringWithFormat"bytes 0-1/%d", self.fileData.length],

                              @"X-Playback-Session-Id" : loadingRequest.request.allHTTPHeaderFields[@"X-Playback-Session-Id"],

                              @"ETag" : @"TAG"};

    NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:loadingRequest.request.URL statusCode:206 HTTPVersion"HTTP/1.1" headerFields:headers];

    //NSURLResponse *response = [[NSURLResponse alloc] initWithURL:loadingRequest.request.URL MIMEType"audio/m4a" expectedContentLength:self.fileData.length textEncodingName"UTF-8"];



    NSData *requestedData = [self.fileData subdataWithRange:NSMakeRange(0, 2)];

    [loadingRequest finishLoadingWithResponse:response data:requestedData redirect:nil];



    return YES;

}

如果能提供任何帮助，我将不胜感激。

谢谢。

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Best Answer-推荐答案

AVAssetResourceLoaderDelegate 在 IOS 6 和 IOS 7 上的工作方式不同。参见 What's New in IOS 7.0

The AVAssetResourceLoaderDelegate protocol now supports loading of arbitrary ranges of bytes from a media resource.

IOS7 之前的标准解决方法是使用本地 HTTP 服务器。参见示例 https://stackoverflow.com/a/21225985

关于ios - iOS 6 上的 AVAssetResourceLoaderDelegate 协议(protocol)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23612094/