[rai] Raiplaysound support, fixes #1951

[nixxo]

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add support for raiplaysound.it, single episode and playlists

fixes #1951

Drafted as I still have to check code for live streams.

[r-ricci]

It works mostly, thank you.
Some playlists, such as https://www.raiplaysound.it/playlist/suoneriesumisura and https://www.raiplaysound.it/audiolibri/16ottobre1943, are handled by the generic extractor and cannot be downloaded. Maybe a more generic regex could fix this?

[bendreth]

I tried to use this version with the following: https://www.raiplaysound.it/programmi/lilloegreg610/puntate/stagione-2020-21
However, it reports only 27 files out of 70 or so in the playlist.

[r-ricci]

I tried to use this version with the following: https://www.raiplaysound.it/programmi/lilloegreg610/puntate/stagione-2020-21 However, it reports only 27 files out of 70 or so in the playlist.

It looks like the url regex ignores the part of the url after the programme name and always extracts the same id. Those 27 files actually belong to https://www.raiplaysound.it/programmi/lilloegreg610. The proper location of the json document for older seasons is listed inside the main json, at "filters"[index] -> "path_id".

raiplay.it has the same bug:

$ yt-dlp -g --playlist-items 1-3 'https://www.raiplay.it/programmi/superquarkpiu/stagione-2019/stagione-2019' | md5sum
41e1e9d0b0794e9f5ba748fabf9696d6  -

$ yt-dlp -g --playlist-items 1-3 'https://www.raiplay.it/programmi/superquarkpiu/stagione-2020/stagione-2020' | md5sum
41e1e9d0b0794e9f5ba748fabf9696d6  -

[bendreth]

Perfect, thanks! 👌

[nixxo]

@4ricci For raiplay it's a little more tricky. I'll have to look into it.

[nixxo]

@pukkandan as suggested by @4ricci another class in this extractor lacked support for sub playlist (like the one in bacc702). Is it ok If I commit here or should I do a separate PR?

[pukkandan]

you can add it to this PR

[nixxo]

@4ricci now it should be complete.