# Human Experience Filter — Roadmap

The installation is built as **five independent sub-projects**, each producing
working, testable software on its own. Each gets its own spec → plan → implement
cycle. This file is the index and dependency map; it is the source of truth for
"what's left."

Design reference: [`specs/2026-06-04-human-experience-filter-design.md`](./superpowers/specs/2026-06-04-human-experience-filter-design.md).

---

## Status at a glance

| # | Sub-project                     | Status        | Unblocks |
|---|---------------------------------|---------------|----------|
| 1 | Catalog & Selection Core        | ✅ Done        | everything |
| 2 | Ingest & Tagging / Review tools | ✅ Done        | a real library |
| 3 | Player Runtime (Pi)             | ⏳ Next        | the room runs |
| 4 | Arduino Firmware (control panel)| ◻ Not started | real knobs |
| 5 | ~~Procedural Side Walls~~       | ❌ Dropped     | — (superseded) |

**Dependency order:** 1 → 2, and 1 → 3. Sub-projects 3 and 4 share a serial
protocol contract and can then proceed in parallel. Sub-project 5 was **dropped**
(2026-06-04): the move to a single panoramic projector showing real video across
the three walls removes the procedural side walls — see the design spec §6/§7.

```
        ┌─────────────────────────┐
        │ 1. Catalog & Selection  │ ✅
        └───────────┬─────────────┘
                    │
        ┌───────────┴───────────┐
        ▼                       ▼
┌───────────────┐      ┌─────────────────────┐
│ 2. Ingest /   │      │ 3. Player Runtime   │
│    Review     │─────▶│    (Pi) → 1 pano     │
└───────────────┘ feeds│    projector         │
   (fills catalog)      └──────────┬──────────┘
                          serial   ▼
                       ┌────────────────┐
                       │ 4. Firmware    │
                       └────────────────┘

(5. Procedural Side Walls — dropped 2026-06-04, single pano projector)
```

---

## 1. Catalog & Selection Core ✅

**Done — merged to `main`, 37 tests.** The dependency root every other
sub-project imports.

- `hef/catalog.py` — `Record` model, validation, JSONL load/save/append.
- `hef/selection.py` — weighted-Euclidean distance, mode filtering with A+V
  fallback, nearest-match `select()`.

Plan: [`2026-06-04-catalog-and-selection-core.md`](./superpowers/plans/2026-06-04-catalog-and-selection-core.md).

---

## 2. Ingest & Tagging / Review tools ✅

**Done — merged to `main` via PR #1 (session 0002, 2026-06-04); 111 tests pass
(2 opt-in real-ffprobe tests skip when the binaries are absent).** The `tools/`
package turns the manual catalog into the assisted *draft-then-review* flow from
the spec, and can populate the library from public-domain sources.

**Delivers (`tools/`):**

- **Ingest** — per-archive fetchers (Internet Archive / Prelinger, Musopen,
  LibriVox, NASA, Free Music Archive, Freesound) that download a candidate and
  write a catalog record.
- **Mechanical tagging** — auto-fill `mode` (probe streams with `ffprobe`),
  `license` / `attribution` / `source_*` (from origin), `duration_s`,
  `resolution`, and `dominant_color` (computed from the video).
- **Coordinate drafting** — propose `left/right/dark/light` with a one-line
  `rationale`, written as `review_status: proposed`.
- **Review CLI** — walk unreviewed records one at a time (show proposed
  coordinates + rationale + a preview frame), accept or correct, flip to
  `approved` and stamp `reviewed_at`.

Spec: [`2026-06-04-ingest-tagging-review-tools.md`](./superpowers/specs/2026-06-04-ingest-tagging-review-tools.md).

**Depends on:** sub-project 1 (`hef.catalog`).
**Done when:** ✅ you can run ingest against a source, get `proposed` records, review
them to `approved`, and `load_catalog`/`validate_catalog` validate the result —
covered by tests on the mechanical-tagging and review state transitions.
**External deps:** `ffmpeg`/`ffprobe` only (no image lib — `dominant_color`, when
requested, is ffmpeg-only and opt-in), per-archive download access.
**Decisions settled:** first-ship archives = **LibriVox, NASA, Internet Archive**
(Musopen/FMA/Freesound deferred stubs); media under a `--media-root` with
`file_path` stored relative to it (spec §6.3); only additive `hef.catalog` change
was `validate_catalog` + `index_by_id`.

---

## 3. Player Runtime (Pi) ⏳ (next)

**Goal:** the thing that makes the room run — read the controls, pick media, play
it across the single panoramic projector.

**Delivers (`player/`):**

- Read the five control values from the Arduino over USB serial.
- Call `hef.selection.select()` on each change; loop the chosen 5–15 min segment
  until the knobs move; **crossfade** on change.
- `None` mode → fade to black + silence.
- Drive the **single panoramic projector** spanning the three walls with the real
  selected video (no primary/side split; no side-wall feed — sub-project 5 dropped).

**Depends on:** sub-project 1 (`select`); a populated catalog from sub-project 2
to be meaningful, but can be developed against a hand-authored catalog and a
**keyboard/serial stand-in** before firmware exists.
**Done when:** given a catalog and a stream of control values, it plays the
correct segment, loops, crossfades, and goes dark on `None` — testable with the
serial input mocked.
**Hardware:** Raspberry Pi 5 (holds the drive + catalog).
**Open decisions:** player stack (mpv via IPC vs. ffmpeg vs. custom); whether the
player hard-restricts to `approved` records.

---

## 4. Arduino Firmware (control panel) ◻

**Goal:** the physical panel — turn knob/selector positions into serial messages.

**Delivers (`firmware/`):**

- Read four knobs (`left`, `right`, `dark`, `light`) and the 4-way content-mode
  selector.
- Quantize/debounce analog inputs to the `0..4` integer scale.
- Send the five values to the Pi over USB serial in a defined framing.

**Depends on:** only the **serial protocol contract** shared with sub-project 3 —
agree that first, then 3 and 4 proceed in parallel.
**Done when:** turning a knob produces the expected serial message (verifiable on
a serial monitor) and the Pi player reacts.
**Hardware:** Arduino + pots/encoders + a 4-position selector.
**Open decisions:** pots vs. detented encoders; exact serial framing.

---

## 5. ~~Procedural Side Walls~~ ❌ Dropped (2026-06-04)

**Superseded.** The move to a single panoramic projector showing the real selected
video across the three walls (design spec §6/§7) removes the procedural ambient
renderer entirely — the mood axis is felt through the chosen content itself. With
it goes the only consumer of `dominant_color`, which becomes optional/opt-in in
the ingest tooling (sub-project 2 spec §5.2).

> *Original goal (for the record): render a slow color wash on the three
> non-primary walls — hue from the playing piece's `dominant_color`, brightness
> from the dark/light knobs — to make the mood axis felt in peripheral vision.*

---

## Cross-cutting decisions to settle as we go

Carried from the design spec's open-questions list — none block sub-project 2:

- **Serial protocol framing** between Arduino and Pi (needed before 3 ⇄ 4).
- **Player stack** on the Pi (mpv / ffmpeg / custom) and how the single panoramic
  output is driven.
- **`approved`-only enforcement** in the player.
- ~~**Side walls** on the primary Pi vs. a second Pi~~ — resolved: side walls dropped.
- ~~**Media storage layout** on the drive~~ — settled by the sub-project-2 spec
  §6.3: media under a `media-root`, `file_path` stored relative to it; the player
  joins it with its drive mount.