Created attachment 7647 [details]
Proof of concept patch

The TuneIn Radio Options context menu provides a very useful browser that
gives access to a Radio station's schedule, past shows/programme episodes
currently available for playing, and a 'You may like' link.

Unfortunately the results returned are:

a) Limited to WMA & MP3 streams

This cuts out content available in AAC or other formats.


b) Somewhat useless when when one is exercising the option from a show or
episode

The response returned is frequently: 'The requested item is not available'.


I find that the attached patch gives much improved results on my local LMS
server. The changes are:

1) Format limitation

Provides a 'formats' parameter to the "http://opml.radiotime.com/Options.ashx"
API. This is generated using the same methodology as
Slim::Plugin::InternetRadio::Plugin.

This demonstrably widens the results returned in the UK, where I am based,
and where the BBC provides a number of higher quality AAC streams. But the
principle is generally applicable.

2) Shows/episodes

The problem here appears to be with using the value of the 'id' parameter
specified in the RadioTime stream URL as the value of the 'id' parameter
provided to the "http://opml.radiotime.com/Options.ashx" API.

I observe that, when the track being played is a show or episode, RadioTime
provides an additional 'sid' parameter in its stream URL. This 'sid' appears
to refer back to the originating show, or station.

Setting the 'id' parameter provided to "Options.ashx" to the value of this
stream 'sid' parameter provides a much better result.

Where a regular live radio stream is being played, I observe that no 'sid' is
provided. In that case use of the RadioTime stream URL's 'id' does appear to
be appropriate.

I haven't confirmed this against RadioTime's published API, as access to that
now requires registration, and I have not chosen to register.


3) Other

The patch also returns a 'userName' parameter if contained within the stream,
and carries a check against an undefined $client parameter. I don't know that
these are necessary.