Play encrypted videos with AVPlayer on iOS

So, I am trying to play an encrypted video using AVplayer and nothing appears in the player.

So my progress on this project looks like this:

1. Added AVPlayer which will have UIView which will play AV content (this works great for playing unencrypted files.)

AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:fileURL options:nil]; //local file url with custom scheme         
AVAssetResourceLoader *loader = [asset resourceLoader];
[loader setDelegate:self queue:dispatch_get_main_queue()];
self.playerItem = [AVPlayerItem playerItemWithAsset:asset];
self.player = [AVPlayer playerWithPlayerItem:self.playerItem];
[self.playerView setPlayer:self.player];

      

        
        
        
      

    

From the above code, I know my following resource loader method is being called:

2.Implemented AVAssetResourceLoaderDelegate protocol and I have implemented the resource loading method as follows.

- (BOOL) resourceLoader:(AVAssetResourceLoader *)resourceLoader shouldWaitForLoadingOfRequestedResource:(AVAssetResourceLoadingRequest *)loadingRequest 
{
    NSURLRequest* request = loadingRequest.request;
    AVAssetResourceLoadingDataRequest* dataRequest = loadingRequest.dataRequest;
    AVAssetResourceLoadingContentInformationRequest* contentRequest = loadingRequest.contentInformationRequest;
    NSMutableData *data;
    //handle content request
    if (contentRequest)
    {
        contentRequest.contentType = @"mov";
        contentRequest.contentLength = movieFileLengthInBytes
        contentRequest.byteRangeAccessSupported = YES;
    }
    if (dataRequest)
    {
        DecryptedStream* readStream = [FS getReadStream:filename error:nil];
        if (readStream)
        {
            while ([readStream hasBytesAvailable])
            {
                NSInteger nRead;
                uint8_t buffer[kBufferReadSize];
                nRead = [readStream read:buffer maxLength:kBufferReadSize];
                NSMutableData *data = [NSMutableData data];
                [data appendBytes:buffer length:nRead];
                [dataRequest respondWithData:data];
            }
        }
        [loadingRequest finishLoading];
    }
    return YES;
}

      

        
        
        
      

    

Based on the above code and other reading in the apple docs for resourceloader: "During loading, the resource loader object may ask for help in loading the resource. For example, a resource that needs decryption may result in the resource loader being asked to provide the appropriate decryption keys. You you can assign a delegate object to a resource loader object and use the delegate to intercept those requests and provide an appropriate response "is basically what I'm doing. However, I cannot get my video to play. I made sure that the data I decoded is correct (i.e. I can write it to a tmp file and play the mov).