feat(qbz): cap local playback requests at the detected output-device limit

Wires limit_quality_to_device to a real consumer on the LOCAL output path (#638 fix 3, spec Phase C). New crate::device_cap module caches the DAC's detected rate ceiling mapped to a Qobuz tier (spec C.3: >96k -> Hi-Res+ = no effective cap; 96/88.2k -> Hi-Res; <=48k -> CD 16/44.1, bit depth included since no 48 kHz tier exists). Detection is the proven read-only query_dac_capabilities probe; it runs in spawn_blocking on EXPLICIT triggers only (startup, the Settings toggle, output-device change, backend change, reset-to-defaults) — never on the playback hot path or poll tick. A stale cap after a hot-unplug until the next device change is the accepted trade, same class as the HiFi wizard. playback::local_playback_quality() returns (tier, QualityLimit): the preference clamped by the cap, with the request-time cause for the badge tooltip (tie reports LocalDeviceCap — the more specific constraint, mirroring the spec's cast tie rule). All LOCAL request sites switch to it: play_track_resolved, prefetch (fetch + throttle estimate), the gapless pre-fetch, and the now-playing badge seed (which can now name the device as the downgrade cause, msgid x8 locales). PRECEDENCE (owner decision): the device actually playing governs. playback_quality() stays the PURE preference and the cast path keeps calling it — cast_service is untouched and the play_audible cast branch returns before any local resolve, so the local DAC cap is structurally unreachable from a cast. The two settings stay independent; nothing is auto-synced. No downsampling anywhere: the cap only changes which tier is REQUESTED; cached/offline bytes still play as-is. Settings plumbing: SettingsState gains device-cap-summary/-detected (property additions to an existing global — no app.slint export change); build_snapshot fills them from the cache; refresh_device_cap re-probes and re-pushes on the explicit triggers. Protected-crate note: no protected file is touched — qbz-audio is only READ through the dac_capabilities probe; qbz-player, playback_engine.rs, alsa_direct.rs, alsa_backend.rs and the backends are untouched; no sample-rate handling changes. cc
2026-07-20 15:06:31 -06:00
1 parent 2e55edea89
commit 534a2a0d5e
@@ -4702,3 +4702,6 @@ msgstr "Kopieren"

 msgid "Copied!"
 msgstr "Kopiert!"
+
+msgid "Limited by your output device's limit"
+msgstr "Begrenzt durch das Limit Ihres Ausgabegeräts"
@@ -507,3 +507,6 @@ msgstr "offline copy — cap not applied"

 msgid "cached copy — cap not applied"
 msgstr "cached copy — cap not applied"
+
+msgid "Limited by your output device's limit"
+msgstr "Limited by your output device's limit"
@@ -4732,3 +4732,6 @@ msgstr "Copiar"

 msgid "Copied!"
 msgstr "¡Copiado!"
+
+msgid "Limited by your output device's limit"
+msgstr "Limitado por el límite de tu dispositivo de salida"
@@ -4702,3 +4702,6 @@ msgstr "Copier"

 msgid "Copied!"
 msgstr "Copié !"
+
+msgid "Limited by your output device's limit"
+msgstr "Limité par le plafond de votre périphérique de sortie"
@@ -4690,3 +4690,6 @@ msgstr "コピー"

 msgid "Copied!"
 msgstr "コピーしました！"
+
+msgid "Limited by your output device's limit"
+msgstr "出力デバイスの上限により制限されています"
@@ -4714,3 +4714,6 @@ msgstr "Kopiëren"

 msgid "Copied!"
 msgstr "Gekopieerd!"
+
+msgid "Limited by your output device's limit"
+msgstr "Beperkt door de limiet van je uitvoerapparaat"
@@ -4702,3 +4702,6 @@ msgstr "Copiar"

 msgid "Copied!"
 msgstr "Copiado!"
+
+msgid "Limited by your output device's limit"
+msgstr "Limitado pelo limite do seu dispositivo de saída"
@@ -4716,3 +4716,6 @@ msgstr "Копировать"

 msgid "Copied!"
 msgstr "Скопировано!"
+
+msgid "Limited by your output device's limit"
+msgstr "Ограничено пределом вашего устройства вывода"
@@ -2992,6 +2992,13 @@ export global SettingsState {

    // Audio — toggles.
    in-out property <bool> limit-quality-to-device: false;
+    // Detected local device limit (#638 fix 3), shown while the toggle above
+    // is on. `device-cap-summary` is the Rust-composed value line (e.g.
+    // "192 kHz · Hi-Res+"; empty = nothing detected yet → row hidden);
+    // `device-cap-detected` false = the probe fell back to an assumed common
+    // rate set, which surfaces the plain informative caveat (never an alert).
+    in-out property <string> device-cap-summary: "";
+    in-out property <bool> device-cap-detected: true;
    in-out property <bool> alsa-hardware-volume: false;
    // DSD delivery mode (DSD plan Phases 2-3): Convert to PCM / DoP /
    // Native DSD. Only meaningful on the ALSA direct backend.