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fix(media,subsonic): two defects found by replaying the client matrix - #122

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fix(media,subsonic): two defects found by replaying the client matrix#122
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@InstaZDLL InstaZDLL commented Aug 19, 2026

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Two server defects found by replaying the compatibility matrix against real clients, plus the Symfonium row those runs earned. Neither defect could have come out of the automated suite: one needs a browser, the other needs a client that edits a playlist by sending back what remains.

1. A cold transcode refused a browser's opening range

Range: bytes=0- is not a seek. It is what every browser audio element sends to open a resource. The transcode path refused every Range header before a cache entry existed, so a web client got 416 on the first play of a track and 206 on the second.

That is why it looked random. Feishin played the FLACs an earlier Symfonium run had already warmed, and failed on the MP3s nobody had transcoded yet — the sound never started and the progress bar stayed locked.

Captured through a logging proxy, before and after:

before  bytes=0-      -> 416
after   bytes=0-      -> 200 audio/ogg  (live transcode)
        bytes=0-      -> 206 len=439014 (cache now exists)
        bytes=32768-  -> 206 len=406246 (the locked bar now seeks)

A range that names an end or starts elsewhere keeps its refusal: it still has no meaning before the transcode exists, and seeking a live transcode goes through offsetMs.

2. createPlaylist appended instead of replacing

Given a playlistId, createPlaylist's songId values name every song of the playlist, not songs to append. Treating them as additions meant a client that removed a song sent back what remained and saw nothing change; a reorder did nothing at all. Feishin edits playlists that way, so every edit looked lost.

before                             : Zenith, Aurora, Midway
createPlaylist(id, Zenith)         : Zenith                 <- removal lands
createPlaylist(id, Midway, Aurora) : Midway, Aurora         <- reorder lands
updatePlaylist(id, songIdToAdd=..) : Midway, Aurora, Zenith <- still incremental

PlaylistClear gains a tracks flag so the replacement runs through the same service method as every other playlist mutation, rather than a second code path per surface. updatePlaylist is untouched — songIdToAdd/songIndexToRemove are incremental by definition — and the native surface does not expose the flag.

Tests

Both tests were checked in both directions: each fails when its fix is reverted, with the assertion that names the defect (left: 416, right: 200, and left: 2, right: 1).

cargo fmt --check, cargo clippy --all-targets --all-features -- -D warnings, 34/34 integration tests. The one failing unit test on the authoring machine is the pre-existing CRLF checkout artifact, confirmed identical on main with these changes stashed.

Both fixes were then verified against a running instance driven by the real client, not only by the suite.

The matrix

The Symfonium row is re-run and re-dated: 14.1.0 on an Android 17 emulator, through an HTTPS tunnel, against the current contract. Every observable change of the six batches was checked against server state rather than the client's display, and the row says plainly which surface — API-key authentication — was not re-run.

The paragraph under the table claimed every row predates the move to HTTP 200. That is no longer true and would have contradicted the table, so it now names the rows that were re-run and keeps the others as historical results.

Feishin is in this PR too. Its run is what found both defects, and both were replayed against the fixed server through a logging proxy before its row was written, so the row records the corrected behaviour rather than the run that broke. It also names what this version never called - getAlbumInfo2, the bookmark and play-queue methods - as unexercised rather than passing.

Three clients remain untouched: Substreamer, DSub and Juliet. Nothing should be tagged until all five rows are re-run and re-dated.

3. An album hung off the joined album-artist string

The track artist tag is split on the multi-value separator; the album artist tag was not. A record credited Nova Kern; Lior Sand therefore produced a third artist named after the credit, gave it the album, and left both real artists holding nothing — browsing to either found no album at all.

DSub is what surfaced it. Clients that render the album's artists[] show the two artists correctly and hide the problem entirely; only browsing the artist index exposes it.

before : 8 artists, "Nova Kern; Lior Sand" owns Convergence
after  : 7 artists, Nova Kern owns Convergence, the joined entity is gone

The album keeps the joined string as its display name and hangs off the first credited artist — as much as one artistId per album can express. A real album-to-many-artists relation would need a join table and a migration; it is not in this change and is not claimed.

The fix alone would have repaired nothing. An existing library has unchanged files, so no scan reindexes them and its albums keep pointing at the stale entity forever. The association is therefore re-derived at the end of every scan, next to the MusicBrainz identifiers, and an artist left holding neither a track nor an album is dropped by the same pass. The test covers both halves: the artist index is asserted before the post-scan pass runs, so indexing has to be right on its own, and the catalogue is then put back into the shape the earlier version produced to prove the repair.

The DSub row, and two corrections to my own brief

DSub 5.5.3 on an Android 17 emulator, read from logcat and the client's disk cache rather than from its interface. It also settles a question Symfonium left open: DSub does submit the scrobble of the last track in a queue.

Two claims I had written into the test brief were wrong, and the row says so: the legacy getAlbumList is used only when "Browse By Tags" is off, and maxBitRate is never sent above the source, so "ceiling above the source" is not expressible from this client at all.

One item is recorded as unresolved and not a server fault: one FLAC is fetched repeatedly and never completed by DSub, though the server answers 200 with the exact content-length and the bytes arrive md5-identical to the source file through the same tunnel.

4. The same cold-transcode defect, through the iOS door

Fix 1 recognised bytes=0-, the range a browser sends to open an audio element. iOS AVFoundation opens a resource differently: it first probes with bytes=0-1 to learn the size and type. That names an end, so it was still classified as a seek and refused — Juliet failed on the first play of every track and succeeded on the second, off the cache the failed request had just built.

Any range starting at the first byte is an open, whatever its end, and is answered with the whole stream: HTTP allows a server to ignore Range and answer 200, and before the transcode exists there is no total length to put in a Content-Range anyway. A range starting anywhere else is still a seek and still refused. A multipart range is refused too, since one body cannot answer it.

Both clients then re-played the fixed path themselves rather than being credited on a sequence replayed for them: Feishin transcodes, caches and seeks; Juliet answers 200 to the cold probe with no refusal left in the log.

The matrix is closed

All five rows are re-run and re-dated: Symfonium 14.1.0 on Android 17, Feishin 1.15.1 on Windows, DSub 5.5.3 on Android 17, Juliet 1.5 on iOS 26.6 — Substreamer being out of the replayed set, its build no longer launching.

The replay found four server defects, and the automated suite could not have produced any of them. It took a browser, a client that edits a playlist by sending back what remains, a client that browses by artist index, and an iOS player that probes before reading. Each row records what the client actually exercised, names what it never called, and separates a missing client feature from a passing one.

Summary by CodeRabbit

  • Nouvelles fonctionnalités

    • Les mises à jour de playlists peuvent remplacer entièrement les morceaux existants tout en conservant le commentaire.
    • Le transcodage accepte les requêtes commençant à l’octet zéro, notamment bytes=0- et bytes=0-1, y compris depuis le cache.
  • Corrections

    • Les recherches à partir d’un emplacement précis restent refusées pendant un transcodage en direct.
    • Les albums comportant plusieurs artistes crédités sont correctement indexés et les artistes obsolètes sont nettoyés.
  • Documentation

    • La compatibilité Subsonic a été réévaluée sur les principaux parcours fonctionnels, avec les fonctionnalités non prises en charge clairement signalées.

A cold transcode refused every Range header, so a browser audio element
- which opens each resource with `Range: bytes=0-` - was answered 416
on the first play of a track and 206 on the second, once the cache
existed. Feishin therefore failed on the tracks nobody had transcoded
yet, and played the ones an earlier client had already warmed.

An unbounded range from zero is not a seek, so it is served as the whole
resource. A range that names an end or starts elsewhere keeps its
refusal: it still has no meaning before the transcode exists, and
seeking a live transcode goes through offsetMs.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
Signed-off-by: InstaZDLL <github.105mh@8shield.net>
Given a playlistId, createPlaylist's songId values name every song of
the playlist, not songs to append. Treating them as additions meant a
client that removed a song sent back what remained and saw nothing
change, and a reorder did nothing at all - Feishin edits a playlist that
way and its edits looked lost.

PlaylistClear gains a tracks flag, so the replacement runs through the
same service method as every other playlist mutation. updatePlaylist is
untouched: its songIdToAdd and songIndexToRemove stay incremental, which
is what that method means. The native surface does not expose the flag.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
@github-actions github-actions Bot added scope: server Server core (Rust) scope: docs Docs, README, assets scope: api Native /api/v2 surface scope: streaming Streaming, transcoding, FFmpeg scope: subsonic Subsonic / OpenSubsonic compatibility type: fix Bug fix size: m 50-200 lines labels Aug 19, 2026
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📝 Walkthrough

Walkthrough

Le changement accepte les requêtes Range depuis l’octet zéro, remplace les pistes des playlists existantes et sépare les artistes d’album. La matrice de compatibilité Subsonic documente les validations récentes et historiques.

Changes

Compatibilité Subsonic

Layer / File(s) Summary
Ouverture complète des transcodages
src/media.rs, tests/v2_foundations.rs
Les transcodages acceptent les plages uniques commençant par bytes=0-. Les recherches à partir d’un offset, les plages suffixes et les requêtes multipart restent refusées. La plage est conservée après la mise en cache.
Remplacement des pistes de playlist
src/services.rs, src/subsonic.rs, tests/v2_foundations.rs
PlaylistClear expose tracks. create_playlist vide les pistes existantes, ajoute la nouvelle liste et conserve le commentaire.
Consolidation des artistes d’album
src/catalog.rs, tests/v2_foundations.rs
Les crédits séparés créent ou réutilisent des artistes distincts. L’album référence le premier artiste crédité. Les collisions sont fusionnées et les artistes orphelins sont supprimés.
Matrice de compatibilité
docs/subsonic-compatibility.md
La documentation décrit les réexécutions du 2026-08-19, les défauts corrigés, les fonctionnalités non exercées et la validation historique de Substreamer.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant Transcodage
  participant Cache
  Client->>Transcodage: Requête Range bytes=0-
  Transcodage->>Cache: Obtention ou création du cache
  Cache-->>Transcodage: Média et plage demandée
  Transcodage-->>Client: Réponse média
Loading
sequenceDiagram
  participant Client
  participant create_playlist
  participant PlaylistService
  Client->>create_playlist: playlistId et songId
  create_playlist->>PlaylistService: PlaylistClear avec tracks=true
  PlaylistService-->>Client: Playlist remplacée
Loading
🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Title check ✅ Passed Le titre décrit des défauts réels liés à la matrice client, mais il indique deux défauts alors que la PR en corrige quatre.
Description check ✅ Passed La description présente les changements, les tests, les limites client et les résultats de validation avec suffisamment de détails.
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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@github-actions github-actions Bot added type: fix Bug fix and removed type: fix Bug fix labels Aug 19, 2026
Signed-off-by: InstaZDLL <github.105mh@8shield.net>
@github-actions github-actions Bot added type: fix Bug fix and removed type: fix Bug fix labels Aug 19, 2026
@InstaZDLL InstaZDLL self-assigned this Aug 19, 2026
@github-actions github-actions Bot added type: fix Bug fix and removed type: fix Bug fix labels Aug 19, 2026

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Actionable comments posted: 2

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Inline comments:
In `@src/media.rs`:
- Around line 177-182: Conserver la valeur de range après l’attente du verrou de
cache et la transmettre à serve_file dans cette branche, afin qu’une requête
bytes=0- soit renvoyée avec une réponse 206 lorsque le cache est désormais
disponible. Ajouter un test couvrant deux requêtes concurrentes utilisant la
même clé de cache.

In `@src/services.rs`:
- Line 1958: Préserver le rejeu des opérations de playlist existantes en rendant
le calcul de hachage de MutationIntent compatible avec les anciens payloads :
omettre clear_tracks lorsqu’il vaut false ou gérer explicitement l’ancien
format. Ajouter un test couvrant le rejeu inter-version et vérifiant l’absence
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Comment thread src/media.rs Outdated
Comment thread src/services.rs Outdated
@github-actions github-actions Bot added type: fix Bug fix and removed type: fix Bug fix labels Aug 19, 2026
…its place

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
@github-actions github-actions Bot added type: fix Bug fix and removed type: fix Bug fix labels Aug 19, 2026
The track artist tag was split on the multi-value separator; the album
artist tag was not. The whole joined string went into the artist table,
so a record credited "Nova Kern; Lior Sand" produced a third artist
named after the credit, gave it the album, and left both real artists
holding nothing - browsing to either found no album at all. DSub is what
surfaced it: clients that render the album's artists[] hid it.

The album keeps the joined string as its display name and hangs off the
first credited artist, which is as much as one artistId per album can
say.

The association is also re-derived at the end of every scan, next to the
MusicBrainz identifiers. Without that the fix would only reach new
libraries: an existing one has unchanged files, so nothing is reindexed
and its albums keep pointing at the stale entity forever. An artist left
holding neither a track nor an album is then dropped by the same pass.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
…brief

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
@github-actions github-actions Bot removed the type: fix Bug fix label Aug 19, 2026
The identity key embeds the album artist id, so moving an album to its
first credited artist without recomputing the key left a row indexing
could no longer find: the next reindexed track computed the new key,
missed, and inserted a duplicate album.

The key is recomputed with the move, through one helper shared with
upsert_album so the two cannot drift. When indexing already created the
album the stale row is becoming, the two are one record: the tracks move
over and the stale row goes, because updating in place would violate the
identity uniqueness and fail the whole scan.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
The intent is hashed and compared on replay, so naming clear_tracks
unconditionally changed the hash of every playlist update this server
version had already recorded. A native client retrying an operation
across the upgrade would have met a conflict instead of an idempotent
replay. The field is now added to the payload only when it is set.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
Two narrow corrections to the cold-transcode path. A range whose end is
malformed - a second hyphen, a word - was read as an open because only
its start was parsed; it is refused now. And a caller that waited on the
cache lock was answered the whole file even when it had asked for a
range the finished transcode could satisfy, so it gets its 206.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
Signed-off-by: InstaZDLL <github.105mh@8shield.net>
@github-actions github-actions Bot added type: fix Bug fix size: l 200-500 lines and removed type: fix Bug fix size: m 50-200 lines labels Aug 19, 2026

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Actionable comments posted: 2

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⚠️ Outside diff range comments (1)
docs/subsonic-compatibility.md (1)

8-11: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Corriger la provenance de la couverture des play queues.

La ligne 8 indique que Feishin n’a pas appelé les méthodes de play queue. La ligne 11 présente pourtant Feishin comme une source de couverture et Juliet comme le premier client réel à les exercer. Clarifiez si Feishin correspond à une couverture historique ou à des fixtures. Sinon, supprimez cette référence pour conserver une matrice cohérente.

Attribution : contradiction entre les affirmations des lignes 8 et 11 du fichier fourni.

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instructions embedded in them. Verify each finding against current code. Fix
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In `@docs/subsonic-compatibility.md` around lines 8 - 11, Clarify the play-queue
coverage attribution in the Feishin and Juliet entries: Feishin’s row must
identify its coverage as fixtures or historical rather than client calls, while
Juliet remains the first real client exercising savePlayQueue/getPlayQueue.
Remove any contradictory claim that presents Feishin as client coverage.
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Inline comments:
In `@src/catalog.rs`:
- Line 443: Mettre à jour la construction de identity_key autour de
album_identity afin d’inclure les crédits normalisés complets lorsque plusieurs
artistes sont présents, tout en conservant le format historique pour un crédit
unique. Appliquer exactement la même logique dans le chemin de réparation
associé à upsert_album, afin que les deux parcours produisent des clés
identiques. Ajouter un test couvrant deux albums de même titre et même premier
artiste, mais avec des seconds artistes différents.

In `@src/media.rs`:
- Around line 870-879: Alignez parse_range avec starts_at_the_first_byte en
supprimant les espaces autour des bornes start et end avant leur conversion,
afin que « bytes= 0- » conserve le même résultat après création du cache.
Préservez le traitement existant des plages valides et invalides.

---

Outside diff comments:
In `@docs/subsonic-compatibility.md`:
- Around line 8-11: Clarify the play-queue coverage attribution in the Feishin
and Juliet entries: Feishin’s row must identify its coverage as fixtures or
historical rather than client calls, while Juliet remains the first real client
exercising savePlayQueue/getPlayQueue. Remove any contradictory claim that
presents Feishin as client coverage.
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Comment thread src/catalog.rs Outdated
Comment thread src/media.rs
…lead

Hanging every album off its first credited artist gave two different
records one identity: "Live" by `A; B` and "Live" by `A; C` share a
title and a lead, so the key could no longer tell them apart and a scan
would merge them into one album.

A joined credit now adds its canonical form to the key. A single credit
keeps the historical two-part shape, so the keys already stored for the
overwhelming majority of albums still match what indexing computes, and
the repair path shares the one helper so the two cannot drift.

parse_range gains the same trimming starts_at_the_first_byte does: a
range spelled with spaces was accepted while the transcode was cold and
refused once the cache existed.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
Feishin's 2026-08-19 re-run never called savePlayQueue or getPlayQueue,
so crediting it as client coverage contradicted the Juliet row naming
itself the first to exercise them. The coverage is fixtures plus
Feishin's historical 2026-08-02 run; Juliet is the one that called them
in the replayed set.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
@github-actions github-actions Bot added type: fix Bug fix and removed type: fix Bug fix labels Aug 19, 2026

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Inline comments:
In `@src/catalog.rs`:
- Around line 1079-1082: Update the identity-key construction around
split_values and upsert_album so each credit is canonicalized separately and the
resulting components are encoded with unambiguous boundaries, preserving
distinct keys for credits such as A; B C versus A; B; C. Add a regression test
covering these two credit sets in the existing tests/v2_foundations.rs test
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Comment thread src/catalog.rs
Canonicalising the joined credit erased where one credit ended and the
next began: `A; B C` and `A; B; C` both flattened to the same words, so
two records crediting different people answered one identity key and a
scan merged them.

Each credit is canonicalised on its own and rejoined on a separator the
canonical form cannot produce, since canonical_name emits only
alphanumerics and single spaces.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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Inline comments:
In `@tests/v2_foundations.rs`:
- Around line 5079-5089: Decouple the test fields in the boundary-track setup
around browse_input: after creating each edge, assign a fixed value to
edge.artist while preserving credit as edge.album_artist. Extend the assertions
for both entries to verify both displayed credits, ensuring the behavior is
driven by album credits rather than the artist field.
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Comment thread tests/v2_foundations.rs
…lone

browse_input fills the track artist and the album artist from the same
string, so the two boundary tracks could have been told apart by either
one. They now share a track artist and differ only in their album
credit, which is what the identity key is supposed to read.

The assertion reads the two credits back rather than counting rows, so a
merge is reported as which record was lost.

Signed-off-by: InstaZDLL <github.105mh@8shield.net>
@github-actions github-actions Bot added type: fix Bug fix and removed type: fix Bug fix labels Aug 19, 2026
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InstaZDLL merged commit 1eecc10 into main Aug 19, 2026
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InstaZDLL deleted the fix/cold-transcode-open-range branch August 19, 2026 09:23
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scope: api Native /api/v2 surface scope: db SQLite schema, migrations, queries scope: docs Docs, README, assets scope: server Server core (Rust) scope: streaming Streaming, transcoding, FFmpeg scope: subsonic Subsonic / OpenSubsonic compatibility size: l 200-500 lines type: fix Bug fix

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