error audio key, unable to load key

[fivebanger]

Describe the bug
Librespot cannot play podcast episode. In this particular situation I'm trying to load "spotify:episode:7CDoCFJUAnwOLPVieM1Us0", "Schenken - Die Geschichte des Gebens und Nehmens".
This issue happens with Librespot dev-branch, compiled as --release (librespot 0.5.0-dev 886617e (Built on 2023-12-10, Build ID: 6mScPS9U, Profile: release).
This issue does not happen with Librespot v0.4.2.

To reproduce
Steps to reproduce the behavior:

1. Start Librespot:$ ./librespot --verbose
2. Start Podcast spotify:episode:7CDoCFJUAnwOLPVieM1Us0, playing on the mobile.
3. In the client click on "Connect to 'Librespot'"
4. See error

Log
[2023-12-27T10:49:23Z TRACE librespot_audio::fetch] Streaming from https://audio-ak-spotify-com.akamaized.net/audio/2916bc99f9878b1197de961a1c15fc572b8086ae?__token__=xxxxxxxxxxxxxxxxxxxxxxxxx
[2023-12-27T10:49:23Z DEBUG librespot::component] new AudioKeyManager
[2023-12-27T10:49:23Z ERROR librespot_core::audio_key] error audio key 0 1
[2023-12-27T10:49:23Z WARN librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
[2023-12-27T10:49:23Z TRACE librespot_audio::fetch::receive] Time to first byte now estimated as: 27 ms
[2023-12-27T10:49:23Z TRACE librespot_audio::fetch::receive] Throughput now estimated as: 1820 kbps
[2023-12-27T10:49:24Z TRACE librespot_audio::fetch::receive] Throughput now estimated as: 1320 kbps
[2023-12-27T10:49:24Z TRACE librespot_audio::fetch::receive] Time to first byte now estimated as: 20 ms
[2023-12-27T10:49:24Z TRACE librespot_audio::fetch::receive] Throughput now estimated as: 1653 kbps
[2023-12-27T10:49:24Z TRACE librespot_audio::fetch::receive] Throughput now estimated as: 1815 kbps

Host (what you are running librespot on):

• OS: Linux
• Platform: PC (Linux Mint 20.3 Cinnamon)
• Mobile: Android
• Location: Germany

Additional context
As already mentioned, the episode plays fine using Librespot v0.4.2 release. I can provide more detailed log for both, Librespot dev-branch and Librespot v0.4.2, both in verbose mode. But I'm not sure which log-information to delete with respect to personal and sensitive data (like tokens, etc.).

[michaelherger]

@roderickvd et al. - I'm still seeing the same, running 0.5.0-dev e24fc72. Some podcasts would no longer play, which would still play using 0.4.2 931b4e6.

I tried to capture a debug log. Maybe it's of some help.

debug.log

[fivebanger]

@roderickvd et al. - I'm still seeing the same, running 0.5.0-dev e24fc72. Some podcasts would no longer play, which would still play using 0.4.2 931b4e6.

I tried to capture a debug log. Maybe it's of some help.

debug.log

I can confirm that @michaelherger's example "Heimat und Abschied: Was die Rückkehr auf den Balkan mit Familien macht" does not play using a recent librespot v0.5.0-dev version.

[fivebanger]

I have tried to dig a little bit more into that. I have added some debug lines of code inside player.rs, fn load_track() in v0.5.0-dev as well as v0.4.2:

        error!("hmk, line 996: format: {:?}", &format);
        error!("hmk, line 997: spotify_id: {}", &spotify_id);
        error!("hmk, line 998: file_id: {}", &file_id);

I get a different "file_id" depending if I run v0.5.0-dev or v0.4.2, pls. see log:

v0.5.0-dev:
[2024-09-15T20:38:42Z INFO librespot] librespot 0.5.0-dev VERGEN_IDEMPOTENT_OUTPUT (Built on 2024-09-03, Build ID: upyelh1p, Profile: release)
[2024-09-15T20:38:42Z INFO librespot_playback::mixer::softmixer] Mixing with softvol and volume control: Log(60.0)
[2024-09-15T20:38:42Z INFO librespot_playback::convert] Converting with ditherer: tpdf
[2024-09-15T20:38:42Z INFO librespot_playback::audio_backend::rodio] Using Rodio sink with format S16 and cpal host: ALSA
[2024-09-15T20:38:42Z INFO librespot_playback::audio_backend::rodio] Using audio device: default
[2024-09-15T20:38:51Z INFO librespot_core::session] Connecting to AP "ap-gew4.spotify.com:4070"
[2024-09-15T20:38:51Z INFO librespot_core::session] Authenticated as "xxx" !
[2024-09-15T20:38:51Z INFO librespot_core::session] Country: "DE"
[2024-09-15T20:38:51Z INFO librespot_core::spclient] Resolved "gew4-spclient.spotify.com:443" as spclient access point
[2024-09-15T20:38:52Z INFO librespot_playback::player] Loading <Schenken - Die Geschichte des Gebens und Nehmens> with Spotify URI spotify:episode:7CDoCFJUAnwOLPVieM1Us0
[2024-09-15T20:38:52Z ERROR librespot_playback::player] hmk, line 996: format: OGG_VORBIS_96
[2024-09-15T20:38:52Z ERROR librespot_playback::player] hmk, line 997: spotify_id: spotify:episode:7CDoCFJUAnwOLPVieM1Us0
[2024-09-15T20:38:52Z ERROR librespot_playback::player] hmk, line 998: file_id: 2916bc99f9878b1197de961a1c15fc572b8086ae
[2024-09-15T20:38:52Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-15T20:38:52Z WARN librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
^C[2024-09-15T20:38:57Z INFO librespot] Gracefully shutting down
[2024-09-15T20:39:05Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: Deadline expired before operation could complete { wait timeout exceeded }

v0.4.2:
[2024-09-15T20:39:17Z INFO librespot] librespot 0.4.2 UNKNOWN (Built on 2024-09-09, Build ID: lIuLog07, Profile: release)
[2024-09-15T20:39:22Z WARN librespot_core::apresolve] Ignoring blacklisted access point ap-gew4.spotify.com:4070
[2024-09-15T20:39:22Z WARN librespot_core::apresolve] Ignoring blacklisted access point ap-gew4.spotify.com:443
[2024-09-15T20:39:22Z WARN librespot_core::apresolve] Ignoring blacklisted access point ap-gew4.spotify.com:80
[2024-09-15T20:39:22Z INFO librespot_core::session] Connecting to AP "ap-guc3.spotify.com:4070"
[2024-09-15T20:39:23Z INFO librespot_core::session] Authenticated as "xxx" !
[2024-09-15T20:39:23Z INFO librespot_playback::mixer::softmixer] Mixing with softvol and volume control: Log(60.0)
[2024-09-15T20:39:23Z INFO librespot_playback::convert] Converting with ditherer: tpdf
[2024-09-15T20:39:23Z INFO librespot_core::session] Country: "DE"
[2024-09-15T20:39:23Z INFO librespot_playback::audio_backend::rodio] Using Rodio sink with format S16 and cpal host: ALSA
[2024-09-15T20:39:23Z INFO librespot_playback::audio_backend::rodio] Using audio device: default
[2024-09-15T20:39:24Z INFO librespot_playback::player] Loading <Schenken - Die Geschichte des Gebens und Nehmens> with Spotify URI spotify:episode:7CDoCFJUAnwOLPVieM1Us0
[2024-09-15T20:39:24Z ERROR librespot_playback::player] hmk: format: OGG_VORBIS_96
[2024-09-15T20:39:24Z ERROR librespot_playback::player] hmk: spotify_id: spotify:episode:7CDoCFJUAnwOLPVieM1Us0
[2024-09-15T20:39:24Z ERROR librespot_playback::player] hmk: file_id: 7f92925ea512da09675c5bce2a6a3e7c1e828a94
[2024-09-15T20:39:26Z INFO librespot_playback::player] <Schenken - Die Geschichte des Gebens und Nehmens> (2620995 ms) loaded
^C[2024-09-15T20:39:42Z INFO librespot] Gracefully shutting down

Even though the Spotify-ID is the same, v0.4.2 gives another file-id compared to v0.5.0-dev. Unfortunately I'm not familiar with any inside view of Spotify and librespot, so no idea why the two versions results in different file_ids and if this is the root cause for not playing the episode using v0.5.0-dev.

[SuisChan]

Does this only happen with episodes? I have some thoughts, will look later

[michaelherger]

FWICT yes. In one case it seemed to not even impact all episodes, but only some, probably the most recent ones.

[fivebanger]

Does this only happen with episodes? I have some thoughts, will look later

While playing around (I thought its maybe related to 96kbps bit-rate) I found that this "error audio key 0 1" appears also for any song I have tried to play when librespot was started with "--bitrate 96". Same as for the episodes: Plays fine with v0.4.2, does not play with v0.5.0-dev.

Steps to reproduce:

• start librespot with 96kbps: $ ./librespot --bitrate 96
• connect with Spotify app from mobile phone and start just any song

Log trace for v0.5.0-dev (with additional debug msgs, marked as error):

[2024-09-11T20:05:38Z INFO librespot] librespot 0.5.0-dev VERGEN_IDEMPOTENT_OUTPUT (Built on 2024-09-03, Build ID: upyelh1p, Profile: release)
[2024-09-11T20:05:38Z INFO librespot_playback::mixer::softmixer] Mixing with softvol and volume control: Log(60.0)
[2024-09-11T20:05:38Z INFO librespot_playback::convert] Converting with ditherer: tpdf
[2024-09-11T20:05:38Z INFO librespot_playback::audio_backend::rodio] Using Rodio sink with format S16 and cpal host: ALSA
[2024-09-11T20:05:38Z INFO librespot_playback::audio_backend::rodio] Using audio device: default
[2024-09-11T20:05:43Z INFO librespot_core::session] Connecting to AP "ap-gew4.spotify.com:4070"
[2024-09-11T20:05:44Z INFO librespot_core::session] Authenticated as "xxx" !
[2024-09-11T20:05:44Z INFO librespot_core::session] Country: "DE"
[2024-09-11T20:05:44Z INFO librespot_core::spclient] Resolved "gew4-spclient.spotify.com:443" as spclient access point
[2024-09-11T20:05:44Z INFO librespot_playback::player] Loading with Spotify URI spotify:track:4vWfES1aalWtGA6cFTiFSw
[2024-09-11T20:05:44Z ERROR librespot_playback::player] hmk: format: OGG_VORBIS_96
[2024-09-11T20:05:44Z ERROR librespot_playback::player] hmk: spotify_id: spotify:track:4vWfES1aalWtGA6cFTiFSw
[2024-09-11T20:05:44Z ERROR librespot_playback::player] hmk: file_id: 6250d957950d2cde266961c870ce6d3868dd2959
[2024-09-11T20:05:44Z ERROR librespot_connect::spirc] ContextError: Error { kind: Unknown, error: StatusCode(502) }
[2024-09-11T20:05:44Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-11T20:05:44Z WARN librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
[2024-09-11T20:05:47Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: end of stream
[2024-09-11T20:05:47Z ERROR librespot_playback::player] Skipping to next track, unable to load track <SpotifyId("spotify:track:4vWfES1aalWtGA6cFTiFSw")>: ()
[2024-09-11T20:05:47Z INFO librespot_playback::player] Loading with Spotify URI spotify:track:5TTcVHPZVETHYLXXqCXsRN
[2024-09-11T20:05:47Z ERROR librespot_playback::player] hmk: format: OGG_VORBIS_96
[2024-09-11T20:05:47Z ERROR librespot_playback::player] hmk: spotify_id: spotify:track:5TTcVHPZVETHYLXXqCXsRN
[2024-09-11T20:05:47Z ERROR librespot_playback::player] hmk: file_id: 0587a52e29ae9e736300beeeb2686256da90ba56
[2024-09-11T20:05:47Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-11T20:05:47Z WARN librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
[2024-09-11T20:05:48Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: end of stream
^C[2024-09-11T20:05:52Z INFO librespot] Gracefully shutting down

Log for v40.4.2 (with additional debug msgs, marked as error):

[2024-09-11T20:06:40Z INFO librespot] librespot 0.4.2 UNKNOWN (Built on 2024-09-09, Build ID: lIuLog07, Profile: release)
[2024-09-11T20:06:47Z WARN librespot_core::apresolve] Ignoring blacklisted access point ap-gew4.spotify.com:4070
[2024-09-11T20:06:47Z WARN librespot_core::apresolve] Ignoring blacklisted access point ap-gew4.spotify.com:443
[2024-09-11T20:06:47Z WARN librespot_core::apresolve] Ignoring blacklisted access point ap-gew4.spotify.com:80
[2024-09-11T20:06:47Z WARN librespot_core::apresolve] Ignoring blacklisted access point ap-gue1.spotify.com:443
[2024-09-11T20:06:47Z INFO librespot_core::session] Connecting to AP "ap-guc3.spotify.com:4070"
[2024-09-11T20:06:48Z INFO librespot_core::session] Authenticated as "xxx" !
[2024-09-11T20:06:48Z INFO librespot_playback::mixer::softmixer] Mixing with softvol and volume control: Log(60.0)
[2024-09-11T20:06:48Z INFO librespot_playback::convert] Converting with ditherer: tpdf
[2024-09-11T20:06:48Z INFO librespot_playback::audio_backend::rodio] Using Rodio sink with format S16 and cpal host: ALSA
[2024-09-11T20:06:48Z INFO librespot_core::session] Country: "DE"
[2024-09-11T20:06:48Z INFO librespot_playback::audio_backend::rodio] Using audio device: default
[2024-09-11T20:06:49Z INFO librespot_playback::player] Loading with Spotify URI spotify:track:4vWfES1aalWtGA6cFTiFSw
[2024-09-11T20:06:49Z ERROR librespot_playback::player] hmk: format: OGG_VORBIS_96
[2024-09-11T20:06:49Z ERROR librespot_playback::player] hmk: spotify_id: spotify:track:4vWfES1aalWtGA6cFTiFSw
[2024-09-11T20:06:49Z ERROR librespot_playback::player] hmk: file_id: f5caad7850c877bf78535c87b5aa1c4e9710817c
[2024-09-11T20:06:51Z INFO librespot_playback::player] (347826 ms) loaded
^C[2024-09-11T20:07:02Z INFO librespot] Gracefully shutting down

Can someone confirm that "--bitrate 96" also has an issue playing songs?

[kingosticks]

Could it be related to gew4 being used in 0.5? The 0.4 log contains

librespot_core::apresolve] Ignoring blacklisted access point ap-gew4.spotify.com:80

@roderickvd do you remember why gew4 is allowed again in 0.5? The specific code to avoid using it isn't there? Is it intentional or accidental?

[roderickvd]

I remember it was intentional. Don't remember but I think the errors on 0.4 did not seem to apply to 0.5 on that AP. Sorry, can't remember any more details.

Does this 96 kbps work again when you ignore that AP? For sure I've never tested that bitrate myself.

Or maybe there's something in the code that selects the most appropriate bitrate, that tries to get a key for a different file with different bitrate? Just a wild guess. I do think I touched that piece of code when I added some boilerplate for future FLAC support.

[kingosticks]

Can someone confirm that "--bitrate 96" also has an issue playing songs?

Yep (v0.5.0-dev)

[2024-09-16T16:01:27Z INFO  librespot_core::spclient] Resolved "gew1-spclient.spotify.com:443" as spclient access point
[2024-09-16T16:01:27Z INFO  librespot_core::spclient] Resolved "guc3-spclient.spotify.com:443" as spclient access point
[2024-09-16T16:01:27Z INFO  librespot_playback::player] Loading <Thank You Buddy> with Spotify URI <spotify:track:3SCWI102atEPe8i7v2jURK>
[2024-09-16T16:01:27Z INFO  librespot_connect::spirc] Resolved 50 tracks from <"spotify:album:29vZTo6729BRVrZVOBHBdH">
[2024-09-16T16:01:28Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-16T16:01:28Z WARN  librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
[2024-09-16T16:01:32Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: end of stream
[2024-09-16T16:01:32Z ERROR librespot_playback::player] Skipping to next track, unable to load track <SpotifyId("spotify:track:3SCWI102atEPe8i7v2jURK")>: ()
[2024-09-16T16:01:32Z INFO  librespot_playback::player] Loading <The Milk> with Spotify URI <spotify:track:57GXoM0Bf9FhO39q7R0OBJ>
[2024-09-16T16:01:32Z INFO  librespot_playback::player] Loading <A Good Thing> with Spotify URI <spotify:track:6rYTM9kpZKVjI2AiwJ2kxg>
[2024-09-16T16:01:32Z INFO  librespot_connect::spirc] Resolved 50 tracks from <"spotify:artist:6GKzHklwb2dpXc1Pqg067x">
[2024-09-16T16:01:33Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-16T16:01:33Z WARN  librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
[2024-09-16T16:01:33Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-16T16:01:33Z WARN  librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
^C[2024-09-16T16:01:37Z INFO  librespot] Gracefully shutting down
[2024-09-16T16:01:45Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: Deadline expired before operation could complete { wait timeout exceeded }
[2024-09-16T16:01:45Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: Deadline expired before operation could complete { wait timeout exceeded }

The other two bitrates work fine for me.

[roderickvd]

This seems like an important regression which must be fixed before 0.5 goes out. Who is willing to work on it?

[fivebanger]

Does this 96 kbps work again when you ignore that AP? For sure I've never tested that bitrate myself.

@roderickvd This issue happens also when blocking "https://apresolve.spotify.com/" and librespot uses its fallback AP. No idea about other AP's, I have not tried to revert blocking of specific AP's in v0.5.0-dev like done in v0.4.2.

v0.5.0 log (with fallback AP):

[2024-09-16T18:20:25Z INFO  librespot] librespot 0.5.0-dev VERGEN_IDEMPOTENT_OUTPUT (Built on 2024-09-03, Build ID: upyelh1p, Profile: release)
[2024-09-16T18:20:25Z INFO  librespot_playback::mixer::softmixer] Mixing with softvol and volume control: Log(60.0)
[2024-09-16T18:20:25Z INFO  librespot_playback::convert] Converting with ditherer: tpdf
[2024-09-16T18:20:25Z INFO  librespot_playback::audio_backend::rodio] Using Rodio sink with format S16 and cpal host: ALSA
[2024-09-16T18:20:25Z INFO  librespot_playback::audio_backend::rodio] Using audio device: default
[2024-09-16T18:20:38Z WARN  librespot_core::apresolve] Failed to resolve all access points, using fallbacks
[2024-09-16T18:20:38Z WARN  librespot_core::apresolve] Resolve access points error: Service unavailable { client error (Connect) }
[2024-09-16T18:20:38Z INFO  librespot_core::session] Connecting to AP "ap.spotify.com:443"
[2024-09-16T18:20:38Z INFO  librespot_core::session] Authenticated as "xxx" !
[2024-09-16T18:20:38Z INFO  librespot_core::session] Country: "DE"
[2024-09-16T18:20:38Z WARN  librespot_core::apresolve] Failed to resolve all access points, using fallbacks
[2024-09-16T18:20:38Z WARN  librespot_core::apresolve] Resolve access points error: Service unavailable { client error (Connect) }
[2024-09-16T18:20:38Z INFO  librespot_core::spclient] Resolved "spclient.wg.spotify.com:443" as spclient access point
[2024-09-16T18:20:38Z WARN  librespot_core::apresolve] Failed to resolve all access points, using fallbacks
[2024-09-16T18:20:38Z WARN  librespot_core::apresolve] Resolve access points error: Service unavailable { client error (Connect) }
[2024-09-16T18:20:38Z INFO  librespot_core::spclient] Resolved "spclient.wg.spotify.com:443" as spclient access point
[2024-09-16T18:20:39Z ERROR librespot_connect::spirc] ContextError: Error { kind: Unknown, error: StatusCode(502) }
[2024-09-16T18:20:39Z INFO  librespot_playback::player] Loading <Spaceman> with Spotify URI <spotify:track:0uQcP7QVoLvaFsORsdrgNh>
[2024-09-16T18:20:39Z ERROR librespot_playback::player] hmk, line 996: format: OGG_VORBIS_96
[2024-09-16T18:20:39Z ERROR librespot_playback::player] hmk, line 997: spotify_id: spotify:track:0uQcP7QVoLvaFsORsdrgNh
[2024-09-16T18:20:39Z ERROR librespot_playback::player] hmk, line 998: file_id: c91072a07a3a45f7666ac2302766dc8165434602
[2024-09-16T18:20:39Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-16T18:20:39Z WARN  librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
[2024-09-16T18:20:41Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: end of stream
[2024-09-16T18:20:41Z ERROR librespot_playback::player] Skipping to next track, unable to load track <SpotifyId("spotify:track:0uQcP7QVoLvaFsORsdrgNh")>: ()
[2024-09-16T18:20:41Z INFO  librespot_playback::player] Loading <You Oughta Know - 2015 Remaster> with Spotify URI <spotify:track:3jS7bB0oXVOwGFZn3aE5NV>
[2024-09-16T18:20:41Z ERROR librespot_playback::player] hmk, line 996: format: OGG_VORBIS_96
[2024-09-16T18:20:41Z ERROR librespot_playback::player] hmk, line 997: spotify_id: spotify:track:3jS7bB0oXVOwGFZn3aE5NV
[2024-09-16T18:20:41Z ERROR librespot_playback::player] hmk, line 998: file_id: 9062385e1738325c74fa165c64ba2154873cfece
[2024-09-16T18:20:41Z ERROR librespot_core::audio_key] error audio key 0 1
[2024-09-16T18:20:41Z WARN  librespot_playback::player] Unable to load key, continuing without decryption: Service unavailable { audio key error }
^C[2024-09-16T18:20:43Z INFO  librespot] Gracefully shutting down
[2024-09-16T18:20:51Z ERROR librespot_playback::player] Unable to read audio file: Symphonia Decoder Error: Deadline expired before operation could complete { wait timeout exceeded }

[fivebanger]

I have added additional debug prints in v0.4.2 as well as in v0.5.0 inside player.rs, fn load_track() in order to get the AudioItem struct or audio struct respectively.

This is the trace for "AudioItem" struct, 96kbps, v0.5.0:

{ track_id: SpotifyId("spotify:track:3jS7bB0oXVOwGFZn3aE5NV"), uri: "spotify:track:3jS7bB0oXVOwGFZn3aE5NV", files: AudioFiles({

OGG_VORBIS_96: FileId(Ok("9062385e1738325c74fa165c64ba2154873cfece")), 
AAC_24: FileId(Ok("84ceeeeb49363c91bf1e5c509a089e6a4b85b550")), 
OGG_VORBIS_320: FileId(Ok("8e75b073e2e6efaa639d1b84c243fe747d7c518c")), 
OGG_VORBIS_160: FileId(Ok("a7734f26618ebdb6996aee5e14479e1442ef9a7d"))}), 

name: "You Oughta Know - 2015 Remaster", covers: [CoverImage { url: "https://i.scdn.co/image/ab67616d0000b273242e643ea07118ecf677a6ef", size: LARGE, width: 640, height: 640 }, CoverImage { url: "https://i.scdn.co/image/ab67616d00001e02242e643ea07118ecf677a6ef", size: DEFAULT, width: 300, height: 300 }, CoverImage { url: "https://i.scdn.co/image/ab67616d00004851242e643ea07118ecf677a6ef", size: SMALL, width: 64, height: 64 }], language: ["en"], duration_ms: 249493, is_explicit: true, availability: Ok(()), alternatives: None, unique_fields: Track { artists: ArtistsWithRole([ArtistWithRole { id: SpotifyId("spotify:artist:6ogn9necmbUdCppmNnGOdi"), name: "Alanis Morissette", role: ARTIST_ROLE_MAIN_ARTIST }]), album: "Jagged Little Pill - 2015 Remaster", album_artists: ["Alanis Morissette"], popularity: 67, number: 2, disc_number: 1 } }

hmk, line 996: format: OGG_VORBIS_96
hmk, line 997: spotify_id: spotify:track:3jS7bB0oXVOwGFZn3aE5NV
hmk, line 998: file_id: 9062385e1738325c74fa165c64ba2154873cfece

This is the trace for "audio" struct, 96kbps, v0.4.2:

{ id: SpotifyId { id: 145021649363201307109311018513601295979, audio_type: Track }, uri: "spotify:track:3jS7bB0oXVOwGFZn3aE5NV", files: {

AAC_320: FileId(Ok("926b60d8d6d7fc5fa94b3f85cf61ce1f7d9c18e8")), 
MP4_128_DUAL: FileId(Ok("84ceeeeb49363c91bf1e5c509a089e6a4b85b550")), 
OTHER5: FileId(Ok("0e01e269fd3e63138da748d6be74dc99f6c5f1b7")), 
OGG_VORBIS_96: FileId(Ok("32f4a529f40bafb9abd834b853f9a25425b78dd4")), 
OGG_VORBIS_320: FileId(Ok("8e75b073e2e6efaa639d1b84c243fe747d7c518c")), 
OGG_VORBIS_160: FileId(Ok("a7734f26618ebdb6996aee5e14479e1442ef9a7d")), 
MP4_128: FileId(Ok("6df9ea6ec96ce6985e05c18279722e7baa7ff767")), 
AAC_160: FileId(Ok("9062385e1738325c74fa165c64ba2154873cfece"))}, 

name: "You Oughta Know - 2015 Remaster", duration: 249493, available: true, alternatives: Some([]) }


[2024-09-16T19:32:13Z ERROR librespot_playback::player] hmk: format: OGG_VORBIS_96
[2024-09-16T19:32:13Z ERROR librespot_playback::player] hmk: spotify_id: spotify:track:3jS7bB0oXVOwGFZn3aE5NV
[2024-09-16T19:32:13Z ERROR librespot_playback::player] hmk: file_id: 32f4a529f40bafb9abd834b853f9a25425b78dd4

For v0.5.0 the used file_id results in "9062385e1738325c74fa165c64ba2154873cfece" which is mapped to "OGG_VORBIS_96" in "AudioItem".
For v0.4.2 the used file_id results in "32f4a529f40bafb9abd834b853f9a25425b78dd4" which is also mapped to "OGG_VORBIS_96" in "audio".

This fits to my observation that v0.4.2 uses a different file_id compared to v0.5.0 for the same spotify_id. The interesting thing is that the file_id "9062385e1738325c74fa165c64ba2154873cfece" which is used in v0.5.0 is the file_id which is mapped to "AAC_160" for v0.4.2. Beside that there are some more audio formats available when using v0.4.2.

I tried to follow up where the "files"-field is populated in v0.5.0 and ended up somewhere in parse_from_bytes() inside messages.rs. No idea about the code there currently....

Edit:
The file_ids for "OGG_VORBIS_320" and "OGG_VORBIS_160" are the same for v0.4.2 and v0.5.0. I guess that's why 320kbps and 160kbps works in 0.4.2 as well as in 0.5.0.

[kingosticks]

Very interesting!

I might be misunderstanding this but the protobuf code here looks a bit suspicious to me. Is it using OGG_VORBIS_96 as the default when it doesn't understand it?

 pub fn format(&self) -> audio_file::Format {
        match self.format {
            Some(e) => e.enum_value_or(audio_file::Format::OGG_VORBIS_96),
            None => audio_file::Format::OGG_VORBIS_96,
        }
    }

So if a value isn't defined in the .proto enum (shown below) then it'll be given OGG_VORBIS_96? And we create a HashMap<AudioFileFormat, FileId> so if there are unknown entries after a real OGG_VORBIS_96 entry, our returned hashmap will contain the last unknown one?

0.4:

message AudioFile {
    optional bytes file_id = 0x1;
    optional Format format = 0x2;
    enum Format {
        OGG_VORBIS_96 = 0x0;
        OGG_VORBIS_160 = 0x1;
        OGG_VORBIS_320 = 0x2;
        MP3_256 = 0x3;
        MP3_320 = 0x4;
        MP3_160 = 0x5;
        MP3_96 = 0x6;
        MP3_160_ENC = 0x7;
        // v4 
        // AAC_24 = 0x8;
        // AAC_48 = 0x9;
        MP4_128_DUAL = 0x8;
        OTHER3 = 0x9;
        AAC_160 = 0xa;
        AAC_320 = 0xb;
        MP4_128 = 0xc;
        OTHER5 = 0xd;
    }
}

0.5:

message AudioFile {
    optional bytes file_id = 1;
    
    optional Format format = 2;
    enum Format {
        OGG_VORBIS_96 = 0;
        OGG_VORBIS_160 = 1;
        OGG_VORBIS_320 = 2;
        MP3_256 = 3;
        MP3_320 = 4;
        MP3_160 = 5;
        MP3_96 = 6;
        MP3_160_ENC = 7;
        AAC_24 = 8;
        AAC_48 = 9;
        FLAC_FLAC = 16;
    }
}

[kingosticks]

Yes, I think that's what is happening. Adding

        AAC_160 = 0xa;
        AAC_320 = 0xb;
        MP4_128 = 0xc;
        OTHER5 = 0xd;

to the v0.5 proto definition fixes 96kbps playback for me.