Hook into the download event for media files

Hi,

I would like to know, if there are any events exposed that i can hook into, on the dowload of media (pdf, docx etc.). 

In good old UnifiedFile world, we used to have these events but not sure about the current MediaData. I managed to find an article on episerver world describing to implement IRenderTemplate and IHttpHandler but not sure about the last bits...

//Do custom processing
//TransmitProcessedFile(customFile.BinaryData)
You can base your custom transmitter implementation on either EPiServer.Web.BlobHttpHandler or EPiServer.Web.MediaHandlerBase, 
and use the TransmitFile method for transmittance of file data.

Any pointers?