Spotify lossless support

[kingosticks]

Discussed in #1578

^{Originally posted by michaelherger September 10, 2025}
https://newsroom.spotify.com/2025-09-10/lossless-listening-arrives-on-spotify-premium-with-a-richer-more-detailed-listening-experience/

(no pressure 😂)

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I'm focusing on a few other things now, but depending on how Spotify implemented this it may actually not be difficult.

Clearly removing the bitrate command line limitations won't work, but some years ago (yeah) I already took care to pave the way for FLAC support in the decoder and audio file selection. If the FLACs and its decryption keys are served over the same way as the Ogg Vorbis files, then that could be quick work... any takers?

Originally posted by @roderickvd in #1578 (reply in thread)

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It would be nice to have real files to check if there is anything to take into account, like with ogg (header) https://github.com/librespot-org/librespot/blob/dev/playback/src/player.rs#L1050 but yeah, it should be a pretty quick work

Originally posted by @SuisChan in #1578 (reply in thread)

[cortegedusage]

@kingosticks I've got Lossless and downloaded some files.
I think I've located the location of the files.
Would it be helpfull to upload those somewhere?

cheers
Dennis

[SuisChan]

@kingosticks I've got Lossless and downloaded some files.
I think I've located the location of the files.
Would it be helpfull to upload those somewhere?

cheers
Dennis

Hey, do you mean spotify's encrypted cache? Yes, we can get the files from there, fortunately I know how everything is encrypted.

[roderickvd]

Appreciate all the offers for help, but please stick to the Spotify ToS: no sharing of files or accounts.
We'll need someone with time and access to lossless capabilities to propose a PR.

[heinzgruber]

Maybe this is possible when librespot can play lossless:

https://community.spotify.com/t5/Live-Ideas/Add-Bit-Perfect-Playback-WASAPI-Exclusive-Mode-on-Windows/idi-p/7125179

[guredora403]

Hello! I think this is truly an amazing project. I'm currently using Spotify's Windows desktop client and am successfully achieving lossless playback, so I'd love to contribute. However, I've been unable to figure out how to read the encrypted communication in the control plane. My apologies for that. Once I know that, I could observe the communication flow during normal playback versus FLAC playback.