Web player: Replaygain support

[abdulocracy]

Replaygain support would be great to have in the LMS web player, I believe the Subsonic web interface does this.

[epoupon]

Hey! I think it may be done with a reasonable amount of work.

[epoupon]

Ok I have started to think seriously about this.
For #46, I have made the audio settings local to each browser, since several browsers usually mean several different ways of listening to music (home, mobile, work for instance).

I am wondering about settings for this one. Actually there are quite a lot of parameters to make it interesting:

I think it would make sense to make parameters local to the browser too.

What do you think?

[abdulocracy]

The usual settings for RG are a toggle for album or track normalization, pre-amp and an option to apply compression to prevent clipping. Here's another example from Strawberry:

As for making the settings local, it makes sense, as this is more a web client feature, RG adjustment over the Subsonic API isn't required, as the RG tags are already sent, and the client (e.g. Strawberry, DSub) handles the adjustment.

[epoupon]

Ok, let's try to keep all web player settings local then :)

[epoupon]

By the way, what soft do you use to set replaygain metadata?
I use mp3gain and I had to hack a bit to find the tags (APE format in a MP3 file that already contains ID3v2 tags...). I would like to have another use example.

[abdulocracy]

I use beets to calculate and embed RG metadata, which uses various backends, I use the ffmpeg backend.

[epoupon]

Would you mind sending me some sample files with replay gain values in? (flac, wma, mp3 would be much appreciated!)

[abdulocracy]

I have some FLAC and MP3s, and can transcode some WMAs. I'll send some to your email.

[epoupon]

What would you think about an automatic replay gain mode?
For example, if there is only songs of the same album in the playlist (or maybe if the previous or next song is from the same album => use album gain), otherwise fallback on track gain.

[epoupon]

It feels like we really need a setting to apply preamp on tracks that do not have RG info, I am about to add that too.

Like this in foobar2k:

[abdulocracy]

What would you think about an automatic replay gain mode?
For example, if there is only songs of the same album in the playlist (or maybe if the previous or next song is from the same album => use album gain), otherwise fallback on track gain.

This is a quite common feature in players, I think it would be great! :)