docs(openspec): archive android-auto-eq-presets

Merges its delta requirements into the android-auto-media base spec.
This commit is contained in:
2026-07-19 14:19:11 +02:00
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# Archive Report: android-auto-eq-presets
**Date**: 2026-07-19
**Change**: android-auto-eq-presets
**Status**: ARCHIVED - VERIFIED PASS
**Commit**: 90cd232 on main
## Summary
The android-auto-eq-presets change has completed all phases (proposal → spec → design → tasks → apply → verify) with a PASS verdict (0 CRITICAL, 0 WARNING, 0 SUGGESTION). The change adds a browsable `Ecualizador` folder to the Android Auto media tree, exposing the 6 fixed EQ presets as selectable items without interrupting playback. Implementation spans 3 files with 346 changed lines (339 insertions + 7 deletions), all covered by strict TDD (46/46 tests passing). Delta spec requirements have been merged into the base `openspec/specs/android-auto-media/spec.md`. The original change folder has been archived to `openspec/changes/archive/2026-07-19-android-auto-eq-presets/` and the source folder deleted.
## Artifacts Preserved
| Artifact | Location | Type |
|----------|----------|------|
| Proposal | `archive/2026-07-19-android-auto-eq-presets/proposal.md` | Requirements intent and scope |
| Design | `archive/2026-07-19-android-auto-eq-presets/design.md` | Architecture, 6 ADRs, integration points |
| Tasks | `archive/2026-07-19-android-auto-eq-presets/tasks.md` | 5 phases, 21 tasks (all complete) |
| Apply Progress | `archive/2026-07-19-android-auto-eq-presets/apply-progress.md` | TDD cycle evidence, 3 files modified |
| Verify Report | `archive/2026-07-19-android-auto-eq-presets/verify-report.md` | Test execution, spec compliance, 0 issues |
| Delta Spec | `archive/2026-07-19-android-auto-eq-presets/specs/android-auto-media/spec.md` | Original change-scoped spec delta |
## Base Spec Merge
**File**: `openspec/specs/android-auto-media/spec.md`
**Changes**:
1. **Modified "Browsable Media Tree" requirement** (line 63):
- Root folder count updated from 3 to 4 (added `Ecualizador`)
- Updated scenario "Car requests the root" to return 4 folders instead of 3
- Updated requirement description to reference EQ folder and preset behavior
2. **Added "EQ Preset Browsable Folder" requirement** (new):
- 6 fixed presets exposed as playable items in `Ecualizador` folder
- Distinct `eq_preset:<nombre>` media-id scheme
3. **Added "EQ Preset Selection Applies Without Disturbing Playback" requirement** (new):
- Branch in `playFromMediaId` intercepted BEFORE `emisora:`/`grupo:` routing
- No `playMediaItem` call, no `mediaItem` mutation
- Three scenarios: preset while playing, preset while stopped, unknown/stale id
4. **Added "EQ Preset Persistence and Phone/Car Parity" requirement** (new):
- Preset applied from car persists as principal preset
- Eventual phone/car parity via SharedPreferences
- Two scenarios: car-to-phone, phone-to-car parity
5. **Added "Active Preset Indication (Optional)" requirement** (new):
- Optional visual marker via title-text convention
- Explicitly allows out-of-scope scoping (ADR-6)
- Two scenarios: with marker, without marker
## Implementation Evidence
**Files Modified**:
- `lib/servicios/navegacion_auto.dart` — 94 insertions (const, functions, tree builder)
- `lib/servicios/servicio_audio.dart` — 26 insertions (handler wiring)
- `test/servicios/navegacion_auto_test.dart` — 226 insertions (15 new test cases, 46/46 passing)
**Test Results**:
- `navegacion_auto_test.dart`: 46/46 passing (34 pre-existing + 12 new test blocks)
- Regression check: `estado_radio_test.dart` (favorite-groups shared surface): 22/22 passing
- Load-bearing invariant verified: preset tap structurally cannot reach `playMediaItem`
**Design Adherence**:
- All 6 ADRs (ADR-1 through ADR-6) verified in live code
- Headless-safe persistence via `ServicioEcualizador.guardarPrincipal` (SharedPreferences)
- Per-station preset override gate mirrored from `cambiarPresetPrincipal`
- Active-preset marker scoped out per ADR-6 (no partial/stale implementation)
## Verification
**Verdict**: PASS (0 CRITICAL, 0 WARNING, 0 SUGGESTION)
**Coverage**:
- Completeness: All 21 tasks verified complete
- Test execution: Independently re-run (46/46 navegacion_auto, 22/22 regression)
- Structural invariants: Signature-enforced non-playback guarantee
- Spec compliance: All 5 spec requirements mapped to code
- Design coherence: All ADRs traced against implementation
**Deviations identified and verified harmless**:
1. `servicio_ecualizador.dart` import added (required for instantiation, task-description omission only)
2. `playFromMediaId` restructured to single outer try/catch (functionally inert for pre-existing paths, required for spec exception safety)
## Archive Integrity
**Source deletion**: Original `openspec/changes/android-auto-eq-presets/` directory has been deleted. No files remain in the change folder; all artifacts are archived in `openspec/changes/archive/2026-07-19-android-auto-eq-presets/`.
**Engram memory**: Archive report saved to engram topic `sdd/android-auto-eq-presets/archive-report` with full observation ID for traceability.
## Next Steps
- Change is complete and closed.
- No follow-up work required (ADR-6 scoping decision on active-preset marker is intentional; revisit only if reliable tree-refresh trigger is added).
- Merged base spec is ready for team use and future changes.
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@@ -62,14 +62,14 @@ The system MUST produce a browsable tree that never presents a user-selectable f
### Requirement: Browsable Media Tree
`getChildren` MUST return a browsable tree rooted at `AudioService.browsableRootId`, organized into non-playable folders (Favoritos, Todas las emisoras, Mis emisoras) containing playable station items. Playable station items SHOULD carry an audio-quality subtitle when known. The `Favoritos` folder additionally MAY contain non-playable favorite-group sub-folders (see "Favorite Group Sub-Folders"); `Todas las emisoras` and `Mis emisoras` remain flat, unchanged by this capability.
(Previously: `Favoritos` was a flat folder of playable station items only, with no sub-folder nesting.)
`getChildren` MUST return a browsable tree rooted at `AudioService.browsableRootId`, organized into non-playable folders (Favoritos, Todas las emisoras, Mis emisoras, Ecualizador) containing playable items. Playable station items SHOULD carry an audio-quality subtitle when known. The `Favoritos` folder additionally MAY contain non-playable favorite-group sub-folders (see "Favorite Group Sub-Folders"); `Todas las emisoras` and `Mis emisoras` remain flat. The `Ecualizador` folder is flat, non-playable, and contains only the 6 fixed EQ preset items (see "EQ Preset Browsable Folder").
(Previously: root contained exactly 3 folders — Favoritos, Todas las emisoras, Mis emisoras — with no EQ folder; Favoritos was a flat folder of playable station items only, with no sub-folder nesting.)
#### Scenario: Car requests the root
- GIVEN the car head unit connects and requests the root (`AudioService.browsableRootId`)
- WHEN `getChildren` is called with the root id
- THEN it returns three folder `MediaItem`s (Favoritos, Todas las emisoras, Mis emisoras), each with `playable: false`
- THEN it returns four folder `MediaItem`s (Favoritos, Todas las emisoras, Mis emisoras, Ecualizador), each with `playable: false`
#### Scenario: Car requests a folder with no stations
@@ -103,6 +103,74 @@ The system MUST produce a browsable tree that never presents a user-selectable f
- THEN that station appears as a playable `emisora:<uuid>` item in exactly the same folder(s), position (subject to existing sort rules), title, art, and subtitle as it did before favorite-group folders were introduced
- AND its presence and shape are unaffected by the existence, emptiness, or content of any favorite group
### Requirement: EQ Preset Browsable Folder
The Android Auto browse tree MUST expose the 6 fixed EQ presets (`PresetEcualizador.presets`) as playable items inside the `Ecualizador` root folder, each using a distinct `eq_preset:<nombre>` media-id scheme, separate from `emisora:<uuid>` and `grupo:<id>`.
#### Scenario: Car requests the Ecualizador folder
- GIVEN the `Ecualizador` folder id was returned under the root
- WHEN `getChildren` is called with the `Ecualizador` folder id
- THEN it returns exactly 6 playable `MediaItem`s, one per `PresetEcualizador.presets` entry, titled with the preset's name
- AND each item's id is `eq_preset:<nombre>`, where `<nombre>` is that preset's unique name
### Requirement: EQ Preset Selection Applies Without Disturbing Playback
Selecting an `eq_preset:<nombre>` item MUST apply that preset immediately through the headless-safe EQ seam (e.g. `PluriWaveAudioHandler.aplicarPreset`), via a branch in `playFromMediaId` intercepted BEFORE the `emisora:`/`grupo:` routing. It MUST NOT call `playMediaItem`, MUST NOT mutate the now-playing `mediaItem`, and MUST NOT start, stop, restart, or otherwise alter current playback or playback position.
#### Scenario: User selects a preset while a station is playing
- GIVEN a station is currently playing and projected to the car
- WHEN the user taps an `eq_preset:<nombre>` item, resolved via `playFromMediaId`
- THEN the matching preset is applied via the headless-safe apply seam
- AND the currently playing station continues uninterrupted, with no change to playback position or now-playing metadata
#### Scenario: User selects a preset while nothing is playing
- GIVEN no station is currently playing
- WHEN the user taps an `eq_preset:<nombre>` item
- THEN the matching preset is applied via the headless-safe apply seam
- AND no playback starts as a result of the selection
#### Scenario: Unknown or stale preset id
- GIVEN `playFromMediaId` receives an `eq_preset:<nombre>` id whose `<nombre>` matches no entry in the current `PresetEcualizador.presets`
- WHEN resolution fails to find a matching preset
- THEN the selection is a no-op: no preset is applied, no playback state changes, and no unhandled exception propagates from the handler
### Requirement: EQ Preset Persistence and Phone/Car Parity
An EQ preset applied from the car MUST persist as the principal preset, with the same observable outcome as the phone's existing `ServicioEcualizador.guardarPrincipal`/`cambiarPresetPrincipal` path, and MUST be reflected on the phone. A principal preset changed on the phone MUST be observable from the car. The exact code path used to reach the headless-safe persistence seam from an Android Auto bind is deferred to `sdd-design`.
#### Scenario: Preset applied from the car persists for the phone
- GIVEN the user selects `eq_preset:<nombre>` from the car head unit
- WHEN the selection is processed
- THEN the preset is persisted as the principal preset
- AND opening the phone's EQ UI afterward shows that preset as the active/principal preset
#### Scenario: Preset applied from the phone is reflected for the car
- GIVEN the user changes the principal preset from the phone UI
- WHEN the car head unit subsequently observes EQ-related state through the browse/selection surface
- THEN the car-observable state reflects the phone's most recently applied principal preset
### Requirement: Active Preset Indication (Optional)
The system MAY indicate the active/principal preset within the `Ecualizador` folder's rows. Because the legacy `MediaBrowserService` browsable-item model has no native "selected item" affordance, any indication, if implemented, MUST be conveyed via a row `title` text convention (e.g. a marker prefix/suffix) rather than assuming a checkmark or selection icon exists. If a reliable title-text convention is too costly to maintain, this requirement MAY instead be satisfied by explicitly not implementing active-preset indication.
#### Scenario: Active preset is indicated via title convention (if implemented)
- GIVEN the currently applied principal preset is known when `Ecualizador`'s children are built
- WHEN the design's chosen title-text convention is applied
- THEN exactly one of the 6 preset rows' `title` carries the active-preset marker, uniquely identifying that preset among the 6
#### Scenario: Active preset indication is out of scope (if not implemented)
- GIVEN the design opts not to implement an active-preset marker
- WHEN the `Ecualizador` folder's children are built
- THEN all 6 preset rows are returned with their plain preset names, with no partial or inconsistent marking applied
### Requirement: Playable Item Metadata
Every playable `MediaItem` (station) MUST include a non-empty `title` and a loadable `artUri`. Stations without a logo MUST fall back to on-brand artwork, and stations whose logo URL cannot actually be loaded MUST degrade to the same on-brand fallback instead of rendering broken or blank art. The fallback MUST be visually consistent with the phone UI's per-station rotation rather than a generic launcher-icon copy.