I think they're just raw compressed audio streams. I don't think either is widely tagged, although its possible something out there can stick ID3 tags on them.
how will we know that the content in side the audio file.
How different are these audio formats?
How will be the structure of files with extention .ac3 , .dts , .dtshd?
How is the Metadata (artist , trach, album) stored in these formats?
are there any special container formats for .ac3 and .dts?