ios – AVAssetResourceLoader支持的AVURLAsset播放仅通过AirPlay失败

由于与我的问题无关的原因,我必须使用自定义AVAssetResourceLoader实现AVPlayer播放AVURLAssets.一般来说,我的实现效果很好,但是当通过AirPlay尝试外部播放时(不镜像):

 self.player.allowsExternalPlayback = YES;
 self.player.usesExternalPlaybackWhileExternalScreenIsActive = YES;

播放失败,AppleTV上显示错误消息,并通过AVPlayerItemFailedToPlayToEndTimeNotification发布错误消息.

我能够通过简单的AVAssetResourceLoader实现重现相同的问题,该实现只是简单地分发本地媒体文件(包含在App Bundle中)的请求数据.这是我的实现:

- (BOOL)resourceLoader:(AVAssetResourceLoader *)resourceLoader shouldWaitForLoadingOfRequestedResource:(AVAssetResourceLoadingRequest *)loadingRequest; {

AVAssetResourceLoadingDataRequest *dataRequest = loadingRequest.dataRequest;
AVAssetResourceLoadingContentInformationRequest *contentRequest = loadingRequest.contentInformationRequest;

NSURL *fileURL = [[NSBundle mainBundle] URLForResource:@"localfile" withExtension:@"mov"];

if (contentRequest)
{
    NSString *extension = [fileURL pathExtension];
    NSString *contentTypeString = (NSString*)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension,(CFStringRef)extension,NULL);

    contentRequest.contentType = contentTypeString;
    contentRequest.contentLength = [[[NSFileManager defaultManager] attributesOfItemAtPath:[fileURL path] error:nil] fileSize];
    contentRequest.byteRangeAccessSupported = YES;
}

if (dataRequest)
{

    NSInteger length = [dataRequest requestedLength];
    if (length>1024*1024*20)
    {
        // limiting to 20MB here because iOS sometimes requests the whole file which would not fit in memory
        length = 1024*1024*20;
    }

    NSFileHandle *fh = [NSFileHandle fileHandleForReadingFromURL:fileURL error:nil];
    [fh seekToFileOffset:[dataRequest requestedOffset]];
    NSData *fileData = [fh readDataOfLength:length];
    [dataRequest respondWithData:fileData];
    [fh closeFile];
}

[loadingRequest finishLoading];

return YES;}

此代码直接在设备上播放.如果启用了AirPlay,则会调用资源加载器,内容和数据请求大约4-5次,请求项目的前8kb.然后回调停止,最终我在Apple TV和一些AVPlayerItemFailedToPlayToEndTimeNotifications上收到错误消息.第一个通知包含“不支持的媒体”错误.

(通过将其添加到AVPlayer中播放相同的媒体作为基于正常文件的项目也可通过AirPlay播放).

任何输入都将非常感谢,谢谢!

最佳答案 我现在收到Apple(通过TSI)对此问题的回复.

使用自定义资源加载程序时不支持Video AirPlay.

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