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docs(openspec): add SDD artifact trail for recent alarm and EQ changes

Persist the exploration, proposal, spec, design, tasks, and
verify/archive reports produced during the multi-device EQ,
alarm-countdown, and notification-visual-polish SDD cycles.

2026-07-04 12:42:11 +02:00

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Proposal: Multi-Device Equalizer

Intent

Users switching between audio outputs (BT headphones, wired headset, car stereo, built-in speaker) must manually re-adjust EQ every time. Each output has different frequency response characteristics, so a flat preset on one device sounds wrong on another. The app should remember per-device EQ preferences and swap them automatically on device change.

Scope

In Scope

Platform channel pluriwave/audio_devices (Android + iOS) for device detection and change events
Dart bridge ServicioDispositivoAudio with testable fake
4-level EQ resolution: station+device > station > device > global
New SharedPreferences keys for device and matrix presets
Feature toggle (off by default) in Settings under "Advanced Equalization Options"
Export/import v3 with device-dimension fields
Copy current preset as starting point when a device is first seen

Out of Scope

Per-station per-device UI (matrix editor) -- future phase
iOS EQ engine (no just_audio support; state tracked, application is no-op)
Audio device selection/routing (only detection, not forcing output)
Custom device naming or grouping

Capabilities

New Capabilities

audio-device-detection: Platform channel bridge for enumerating and streaming audio output device changes (Android AudioDeviceCallback, iOS AVAudioSession route notifications)
multi-device-eq: Device-aware EQ resolution, persistence of per-device and matrix presets, automatic preset swap on device change

Modified Capabilities

equalizer: Resolution logic gains device dimension; _recrearPlayer() re-applies device-resolved preset instead of _presetActual
export-import: v3 schema adds presetsPorDispositivo and presetsMatriz fields with backward-compatible import

Approach

Custom platform channel (pluriwave/audio_devices) on both platforms, following the established pattern (alarm, visualizer, file_actions). ServicioDispositivoAudio exposes a Stream<String> of device IDs. EstadoEcualizador subscribes and resolves via the 4-level hierarchy. Feature is gated by eq_multi_device_enabled_v1 flag.

Affected Areas

Area	Impact	Description
`lib/servicios/servicio_dispositivo_audio.dart`	New	Dart platform channel bridge
`lib/modelos/dispositivo_audio.dart`	New	Device value model
`android/.../MainActivity.kt`	Modified	Add `pluriwave/audio_devices` channel
`ios/Runner/AudioDevicesPlugin.swift`	New	iOS device detection
`lib/servicios/servicio_ecualizador.dart`	Modified	New SP keys, device/matrix persistence
`lib/estado/estado_ecualizador.dart`	Modified	4-level resolution, device stream subscription
`lib/servicios/servicio_audio.dart`	Modified	Expose current device ID
`lib/servicios/servicio_export_import.dart`	Modified	v3 schema with device fields
`lib/pantallas/pantalla_ajustes.dart`	Modified	Advanced EQ toggle + device preset list
`test/estado/estado_ecualizador_test.dart`	Modified	Device-dimension test cases
`test/helpers/fakes.dart`	Modified	FakeServicioDispositivoAudio

Risks

Risk	Likelihood	Mitigation
`_recrearPlayer()` resets EQ on source change	High	Re-apply device-resolved preset in `_activarEcualizador()`
iOS BT device uid instability across restarts	Medium	Use `portType+portName` as fallback key
v3 import in older app versions	Low	Null-safe handling; ignore unknown keys
SharedPreferences size with large matrix	Low	~20KB for 250 entries; well within limits

Rollback Plan

Feature toggle eq_multi_device_enabled_v1 defaults to false -- disable returns to current behavior immediately
All new SP keys are independent; deleting them restores original EQ state
Export v3 is backward-compatible; v2 importers ignore new fields
Native channel can be removed without affecting existing channels
If critical issues arise, ship a patch setting the toggle to false and hiding the Settings section

Dependencies

Android minSdk >= 23 (already required by AndroidEqualizer)
No new pub dependencies

Success Criteria

Device change triggers automatic EQ preset swap within 500ms
Resolution hierarchy produces correct preset for all 4 levels
Feature toggle off: zero behavioral change from current release
Export/import round-trips device presets without data loss
All new logic covered by unit tests (Strict TDD)
No new permissions required on either platform

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