If your TYPO3 instance offers an Atom feed (or RSS), you should link to it in the HTML page <head> to enable feed autodiscovery by feed readers and podcast clients.
In your extension, add a feed page ID setting to the TypoScript constants:
Configuration/TypoScript/constants.txt
#cat=project/links; type=int+; label=Podcast index page pids.podcast = 61
In the TypoScript that generates the page, add the header as follows:
Configuration/TypoScript/setup.txt
page = PAGE page { headerData { 30 = TEXT 30 { typolink { parameter = t3://page?uid={$pids.podcast}&type=6 returnLast = url forceAbsoluteUrl = 1 } wrap = <link rel="alternate" type="application/atom+xml" title="Podcast" href="|"/> } } }
Note that we use page type 6 for atom feed output here, which is also configured via TypoScript.
The example here works fine with TYPO3 v8.