ALAsset reading data for upload

uploader.rb

def assets_library
  @_assets_library ||= ALAssetsLibrary.alloc.init
end

@foo.clips.each_with_index do |clip,i|
        # clip[1][:reference_url] refers to a video file chosen via BW::Device.camera.any.picture(media_types: [:movie]) do |result|
        asset_url = clip[1][:reference_url]
        assets_library.assetForURL(asset_url, resultBlock: lambda { |asset|
          selectedAsset = asset
          byteArraySize = selectedAsset.defaultRepresentation.size
          rawData = NSMutableData.alloc.initWithCapacity(byteArraySize)
          bufferPointer = rawData.mutableBytes
          error = Pointer.new(:object)
          selectedAsset.defaultRepresentation.getBytes(bufferPointer, fromOffset:0, length:byteArraySize, error:error)
          rawData = NSMutableData.dataWithBytes(bufferPointer, length:byteArraySize)
          clip[2] = rawData
          if ([email protected] and [email protected]_started)
            run_request
          end
          completion_block.call(nil) if block_given?
        }, failureBlock: lambda {|error|
          puts error
      })
    end