all sync, docs mostly

2026-07-29 03:38:52 +03:00 · 2026-06-18 16:39:49 +02:00
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 # Codec2 / ultra-low-bandwidth voice — design review (DR)
 <!-- doc-meta:start -->
 | Field | Value |
 |---|---|
 | Author | Anton Afanasyeu |
 | Revision | R0 |
 | Creation date | 2026-06-17 |
 | Last modification date | 2026-06-17 |
 | Co-authored | Cursor Agent (project assistant) |
 | Severity | low |
 | State | approved for planning (implementation post-alpha) |
 | Document type | DR |
 | Pre-requisite to | [ROADMAP.md](../ROADMAP.md) §6.1 Opus/Speex JNI encode/decode; F1 SFU SPEC (post-alpha) |
 <!-- doc-meta:end -->
 \newpage
 \newpage
 ---
 **Document type:** DR (Design Review)  
 **Source draft:** [docs/drafts/20260617_codec2_ulbw_voice_integration.txt](../drafts/20260617_codec2_ulbw_voice_integration.txt)  
 **PDF:** [20260617_codec2_ulbw_voice.pdf](20260617_codec2_ulbw_voice.pdf) · Regenerate: `bash scripts/build-all-docs-pdf.sh`  
 **Status:** PO-reviewed (inline draft comments incorporated) — **no native implementation** until Opus/Speex JNI sinks land  
 **Scope:** Voice-only / ULBW audio cast on P2P (LAN, BT, mesh); future MCU/SFU relay hooks
 **Related:** [OPUS_SPEEX_VALIDATION.md](../OPUS_SPEEX_VALIDATION.md) · [ndk/README.md](../../ndk/README.md) · [20260608_BE_SERVICES_and_infra.md](../20260608_BE_SERVICES_and_infra.md) § SFU · [specs/20100612_1_scaling.md](../specs/20100612_1_scaling.md) F1
 **Documentation index:** [README.md](../README.md)
 ---
 ---
 ---
 ## Table of contents
 <!-- toc -->
 - [1. Executive summary](#1-executive-summary)
 - [2. Problem statement](#2-problem-statement)
 - [3. Vocabulary](#3-vocabulary)
 - [4. Current state (mobile + BE)](#4-current-state-mobile--be)
 - [5. Codec landscape and PO decisions](#5-codec-landscape-and-po-decisions)
 - [6. Goals and non-goals](#6-goals-and-non-goals)
 - [7. Mobile peer negotiation (today)](#7-mobile-peer-negotiation-today)
 - [8. Proposed mobile integration](#8-proposed-mobile-integration)
 - [9. Future backend: MCU / SFU](#9-future-backend-mcu--sfu)
 - [10. Protocol extensions](#10-protocol-extensions)
 - [11. Third-party and licenses](#11-third-party-and-licenses)
 - [12. Testing and validation](#12-testing-and-validation)
 - [13. Task dependency graph](#13-task-dependency-graph)
 - [14. Risks](#14-risks)
 - [15. Open questions (remaining)](#15-open-questions-remaining)
 - [16. Changelog](#16-changelog)
 <!-- /toc -->
 ---
 ## 1. Executive summary
 **Question:** Should androidcast integrate **Codec2** for ultra-low-bandwidth (ULBW) **voice-only** casts when normal AAC/Opus paths are too heavy for the link?
 **Short answer:** **Yes, as a post-alpha product slice** — not a lab experiment. End users on marginal links (BT P2P, slow mesh, very poor LTE) should get **intelligible audio** (“something rather than nothing”). **Codec2 @ 3200 bit/s** (and lower modes where needed) fits that goal better than Opus narrowband @ ~6 kbps + FEC in PO’s practical experience (lower sustained bandwidth, less audible noise on those links).
 **DR decision (R0):**
 | Item | Decision |
 |------|----------|
 | **Primary use case** | **Voice-only** ULBW cast; not the audio leg of full screen cast (8 kHz telephony; no lip-sync with HD video) |
 | **Codec2 modes** | **3200 bit/s** default target; **700C** for extreme BT/mesh; user/dev sub-mode selection |
 | **MELP / TWELP** | **Out of scope** (patent / slim OSS path) |
 | **AAC** | Keep as platform MediaCodec path; no license conflict for screen cast |
 | **Opus / Speex** | Finish **JNI encode/decode** first ([ROADMAP.md](../ROADMAP.md) — cross-compile done, sinks **TODO**); negotiation/scaffolding exists today but wire path is **stub → AAC** without `libopus.a` / encode JNI |
 | **Codec2 timing** | After **6.1** JNI baseline; behind dev flag until E2E validated |
 | **SFU / MCU** | Plan **transcode at ingress** (Codec2 → Opus) for mixed WebRTC rooms; separate F1 SPEC — signaling reuses extended audio caps |
 | **MSG_AUDIO_SELECTED** | Add in handshake when Codec2 implementation starts (SETTINGS_VERSION bump) — aligns P2P multicast and SFU data channel |
 ---
 ## 2. Problem statement
 Screen cast defaults to **AAC** (32–128 kbps class). Negotiation already advertises **Opus** and **Speex**, but without native encode/decode the sender often still ships **AAC** while labeling Opus in diagnostics.
 For **ULBW** links:
 - Opus @ 6 kbps + FEC/NACK can exceed the sustained budget PO has seen on BT/mesh and adds noise versus Codec2-class vocoders.
 - Users still want **audio cast** (commentary, coordination, voice relay) when video is impossible — a deliberate **voice-only** mode.
 Future **multipoint** (F1 SFU/MCU) cannot rely on pairwise discovery bitmasks alone; room-level **negotiated_audio** must be defined before Codec2 legs join a relay.
 ---
 ## 3. Vocabulary
 | Term | Meaning |
 |------|---------|
 | **ULBW** | Ultra-low bandwidth; sustained **&lt; 3–4 kbps** audio payload target on worst links |
 | **Voice-only cast** | No video track; discovery may send `videoCodecs = 0` |
 | **Radio mode** | Dev/user profile preferring Codec2 in AUTO when both peers advertise `AUDIO_CODEC2` |
 | **P2P negotiation** | `CastProtoHeader.audioCodecs` bitmask + `AudioNegotiator` (today) |
 | **Room negotiation** | Signaling API + server-published codec (SFU future) |
 | **SFU** | Selective forwarding unit — relay without per-subscriber transcode |
 | **MCU** | Mix decode → PCM → encode; needed for heterogeneous legs |
 ---
 ## 4. Current state (mobile + BE)
 ### 4.1 Audio codecs in app
 | Layer | Opus / Speex today | Notes |
 |-------|-------------------|-------|
 | `CastCodecFlags` | `AUDIO_OPUS=4`, `AUDIO_SPEEX=8` | Masks advertised in discovery |
 | `AudioNegotiator` | Works | AUTO scoring via `CodecPriorityCatalog` |
 | `NativeCodecBridge` | **Probe only** (`nativeIsOpusAvailable`) | No encode/decode JNI in `opus_bridge.c` / `speex_bridge.c` |
 | Wire path | **OPUS_STUB / SPEEX_STUB → AAC** | `PassthroughCodecPolicy`, `AudioCodecFactory` |
 | Build | `scripts/build-native-codecs.sh` can link `.a` | [ROADMAP.md](../ROADMAP.md): JNI sinks **TODO** |
 **Clarification for PO:** Prior agent work completed **negotiation, settings UI, priority catalog, and native autolink scaffolding** — not full Opus/Speex on-the-wire encoding. Task **6.1** remains open for JNI sinks + E2E per [OPUS_SPEEX_VALIDATION.md](../OPUS_SPEEX_VALIDATION.md).
 ### 4.2 Video vs audio negotiation asymmetry
 ```mermaid
 sequenceDiagram
    participant S as Sender
    participant R as Receiver
    Note over S,R: Discovery: audioCodecs bitmask in header
    S->>R: MSG_HELLO, CAST_SETTINGS
    S->>R: MSG_CODEC_CAPS (video MIME list)
    R->>S: MSG_RECEIVER_CAST_SETTINGS
    R->>S: MSG_CODEC_CAPS
    R->>S: MSG_CODEC_SELECTED (video MIME only)
    Note over S: AudioNegotiator.resolveForSender(peerMask)
    Note over R: No MSG_AUDIO_SELECTED today
 ```
 ### 4.3 Backend (gray)
 - `SfuRelayGate.PREVIEW_ENABLED = false`; `api/sfu_health.php` returns disabled.
 - Janus on **:8089** is **other stack** — androidcast signaling stays on `apps.f0xx.org` PHP ([INFRA.md](../INFRA.md)).
 ---
 ## 5. Codec landscape and PO decisions
 | Codec | Bitrate | Role in androidcast | DR decision |
 |-------|---------|---------------------|-------------|
 | **Codec2** | 700–3200 bps | ULBW voice-only | **Integrate** (post-6.1) |
 | **Opus SILK NB** | ~6–12 kbps | General narrowband when link allows | Finish JNI; keep in AUTO above Codec2 only when bandwidth sufficient |
 | **Speex NB** | ~2–15 kbps | Legacy / fallback | Finish JNI |
 | **AAC-LC** | 32+ kbps | Screen cast default | Unchanged |
 | **MELP/TWELP** | ~2.4 kbps | — | **Rejected** |
 **PO rationale (2026-06-17):** Opus @ 6k + FEC is **heavier and noisier** than Codec2 on target links; Codec2 **3200 bps** meets product goals; intent is **end-user value**, not codec shootout lab work.
 **Maintainer risk:** Codec2 upstream is in active re-development; pin submodule tag (e.g. 1.2.0) and mirror on Gitea like `third-party/opus`.
 ---
 ## 6. Goals and non-goals
 ### Goals
 - Voice-only cast mode with **Codec2 encode/decode** on Android (NDK).
 - Extend **peer negotiation** (`AUDIO_CODEC2 = 16`, optional `MSG_AUDIO_SELECTED`).
 - Document **SFU ingress transcode** and room caps for F1 SPEC.
 - LGPL compliance + license files.
 ### Non-goals (R0)
 - MELP/TWELP integration.
 - Codec2 as default for **screen cast with video**.
 - SFU passthrough-only design (closed Android mesh edge case only).
 - Alpha ship — hidden until E2E + PO QA.
 ---
 ## 7. Mobile peer negotiation (today)
 | Step | Mechanism | Codec2 impact |
 |------|-----------|---------------|
 | Advertise | `CastCodecFlags.localAudioMask()` in discovery | Add bit 16 when native probe passes |
 | Resolve | `AudioNegotiator.negotiate(senderMask, receiverMask, pref, settings)` | Add `CODEC2` to enum + `CodecPriorityId` |
 | Score | `codecs.json` + `CodecPriorityCatalog` | ULBW profile: CODEC2 lowest `bitrate_score` |
 | Wire | Audio frames (today AAC ADTS) | New codec tag or `MSG_AUDIO_FRAME` subtype |
 **Gap:** Receiver does not receive explicit audio selection — sender-resolved only. **Must fix** before multicast + SFU (§10).
 ---
 ## 8. Proposed mobile integration
 ### 8.1 Settings and enum
 ```text
 CastSettings.AudioCodec.CODEC2
 CastSettings.codec2Mode: 3200 | 1300 | 700C  (default 3200 per PO)
 CastSettings.VoiceOnlyMode: boolean
 ```
 ### 8.2 Native stack
 1. `third-party/codec2` submodule + `scripts/init-third-party-submodules.sh`
 2. `scripts/build-native-codecs.sh` → `libcodec2.a`, `ANDROIDCAST_HAVE_CODEC2`
 3. JNI: `isCodec2Available()`, encode/decode **8 kHz mono** frames
 4. Link via existing `libandroidcast_codecs.so`
 ### 8.3 Priority (ULBW profile)
 Suggested AUTO order when `NetworkAdoption.ESTIMATED` or **radio mode** on:
 **CODEC2 → OPUS → SPEEX → AAC → PCM**
 ### 8.4 Milestones
 | # | Deliverable | Depends on |
 |---|-------------|------------|
 | M1 | Opus/Speex JNI encode/decode + E2E | 6.1 |
 | M2 | Codec2 probe + round-trip unit test | M1 |
 | M3 | Voice-only UI slice (dev gate) | M2 |
 | M4 | `MSG_AUDIO_SELECTED` + SETTINGS_VERSION | M2 |
 | M5 | SFU signaling fields in F1 SPEC | Owner SFU spec |
 ---
 ## 9. Future backend: MCU / SFU
 ```mermaid
 flowchart TB
    subgraph clients [Android clients]
        A[Sender A Codec2]
        B[Sender B Opus]
        C[Receiver WebRTC]
    end
    subgraph be [BE post-alpha]
        SIG[Signaling API PHP]
        SFU[Janus / media worker]
    end
    A --> SIG
    B --> SIG
    SIG --> SFU
    SFU -->|transcode| C
    SFU -->|fan-out Opus| B
 ```
 ### 9.1 Negotiation shift (P2P → room)
 | Layer | P2P today | SFU future |
 |-------|-----------|------------|
 | Caps | Header bitmask | `join` JSON: `audio_caps.bitmask`, `codec2_modes[]` |
 | Pick | `AudioNegotiator` local | Server `negotiated_audio` |
 | Auth | PIN / LAN | Session RBAC + room token |
 ### 9.2 Codec2 on media plane (DR preference)
 | Mode | When | CPU on be-media-N |
 |------|------|-------------------|
 | **Transcode ingress** | Mixed room (Android + browser) | **Recommended** — decode Codec2 → Opus egress |
 | Passthrough | All Codec2 clients | Low CPU; no WebRTC viewers |
 | MCU mix | Conference voice | High CPU; radio bridge legs only |
 **Signaling sketch** (F1 SPEC — not implemented):
 - `POST /api/sfu/room` — `ingress_caps: [opus, codec2]`, `egress_caps: [opus]`
 - `POST /api/sfu/room/{id}/join` — returns transport params + `negotiated_audio`
 Mobile: `SfuSignalingClient` fills `CastSettings.resolvedAudioCodec` from server; **LAN fallback** if signaling down.
 ---
 ## 10. Protocol extensions
 ### 10.1 `CastCodecFlags`
 ```text
 AUDIO_CODEC2 = 16   // next free bit after SPEEX=8
 ```
 ### 10.2 `MSG_AUDIO_SELECTED` (recommended at M4)
 ```text
 payload: uint32 audio_flag (little-endian) + uint8 codec2_mode_id
 ```
 Symmetric with `MSG_CODEC_SELECTED`; reusable on WebRTC data channel.
 ### 10.3 `CastSettings.SETTINGS_VERSION`
 Bump when adding `sfu_room_id`, `relay_mode`, `server_negotiated_audio` (SFU phase).
 ---
 ## 11. Third-party and licenses
 | Component | License | Action |
 |-----------|---------|--------|
 | codec2 (libcodec2) | LGPL-2.1 | Submodule + Gitea mirror; dynamic link in `.so` |
 | Opus / Speex | BSD | Existing |
 | ffmpeg (SFU transcode) | LGPL/GPL | BE media worker SPEC only |
 Update mobile `LICENSES` / notices when submodule added ([bottomline_reminder.txt](../../bottomline_reminder.txt)).
 ---
 ## 12. Testing and validation
 | Phase | Tests |
 |-------|-------|
 | Unit | `AudioNegotiatorTest` CODEC2 mask; `CastProtoHeader` round-trip |
 | Native | JNI c2enc/c2dec parity arm64-v8a |
 | E2E | Extend [OPUS_SPEEX_VALIDATION.md](../OPUS_SPEEX_VALIDATION.md) — voice-only, UDP/TCP, diagnostics kbps |
 | SFU | Post-alpha: 2× Codec2 Android + 1× WebRTC viewer via transcode |
 ---
 ## 13. Task dependency graph
 ```mermaid
 flowchart TB
    A61["6.1 Opus/Speex JNI sinks<br/>Developer · P5"]
    C2["Codec2 NDK + voice-only<br/>Agent · post-alpha"]
    AUDIO_HS["MSG_AUDIO_SELECTED<br/>Agent"]
    SFU["F1 SFU SPEC + signaling<br/>PO · post-alpha"]
    TRANS["SFU Codec2 transcode worker<br/>BE media"]
    A61 --> C2
    C2 --> AUDIO_HS
    AUDIO_HS --> SFU
    SFU --> TRANS
    style A61 fill:#b45309,color:#fff
    style C2 fill:#7c3aed,color:#fff
    style SFU fill:#e5e7eb,color:#374151
 ```
 **Numbered priority (PO overrides AI):**
 1. **6.1** — Opus/Speex JNI (alpha LAN quality path; unblocks honest ULBW comparison)
 2. **Codec2 ULBW** — this DR (parallel after M1 green)
 3. **F1 SFU SPEC** — room negotiation + transcode
 4. Alpha blockers **5.1 / 5.2 / 4.rssh** remain above on [OPEN_TASKS_GRAPH.md](../OPEN_TASKS_GRAPH.md)
 ---
 ## 14. Risks
 | Risk | Mitigation |
 |------|------------|
 | Codec2 upstream churn | Pin tag; Gitea mirror |
 | 8 kHz-only confuses users expecting music | Voice-only mode UX; no video leg |
 | SFU CPU cost | Ingress transcode budget in scaling SPEC |
 | Opus/Speex “done” confusion | ROADMAP + this DR state JNI sinks explicitly |
 | BT latency 150–300 ms | Document; jitter buffer 80–120 ms |
 ---
 ## 15. Open questions (remaining)
 | # | Question | Owner |
 |---|----------|-------|
 | 1 | SFU commercial story: always transcode vs optional passthrough mesh? | PO |
 | 2 | Ship Codec2 in AUTO on ULBW profile or explicit “radio mode” only? | PO + UX |
 | 3 | `700C` exposed to end users or dev-only? | PO |
 **Resolved by PO (2026-06-17):** voice-only ULBW product intent; Codec2 3200 OK; skip MELP/TWELP; Opus @ 6k insufficient for target links; AAC platform use OK.
 ---
 ## 16. Changelog
 | Rev | Date | Change |
 |-----|------|--------|
 | R0 | 2026-06-17 | Initial DR from draft; PO inline comments; Opus/Speex JNI status clarified |
--- a/docs/DRs/20260617_codec2_ulbw_voice.pdf
+++ b/docs/DRs/20260617_codec2_ulbw_voice.pdf
--- a/docs/GIT_FLOW.pdf
+++ b/docs/GIT_FLOW.pdf
--- a/docs/GRAFANA_vs_others_graphvis_pivot.pdf
+++ b/docs/GRAFANA_vs_others_graphvis_pivot.pdf
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--- a/docs/INFRA.pdf
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--- a/docs/OPEN_API.pdf
+++ b/docs/OPEN_API.pdf
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+/Author (Android Cast project) /CreationDate (D:20260617220500+02'00') /Creator (\(unspecified\)) /Keywords () /ModDate (D:20260617220500+02'00') /Producer (ReportLab PDF Library - \(opensource\)) 
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 /ID 
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--- a/docs/OPEN_TASKS_GRAPH.md
+++ b/docs/OPEN_TASKS_GRAPH.md
@@ -93,7 +93,7 @@ _Last synced: 2026-06-04 (RSSH full stack on `feature/rssh-alpha`, RA control HT
 | **P4b** | **4.rssh** deploy soak | **Yes** (alpha essential) |
 | **P5** | **6.1–6.6** app LAN | LAN alpha |
 | **P9** | **9.x** landing (excl. globe FR) | No |
-| **Post-alpha** | **SFU** relay | No |
+| **Post-alpha** | **SFU** relay, **ULBW Codec2** voice | No |
 ---
@@ -127,6 +127,7 @@ flowchart TB
    subgraph POST["Post-alpha"]
        SFU["SFU / Janus relay"]
        ULBW["Codec2 ULBW voice<br/>DR R0 · after 6.1"]
    end
    FULL["FULL_ALPHA<br/>no DNS/mail"]
@@ -142,12 +143,15 @@ flowchart TB
    A65 --> A66
    SFU -.-> FULL
    A61 --> ULBW
    ULBW -.-> SFU
    style FULL fill:#1e3a5f,color:#fff
    style OTA fill:#991b1b,color:#fff
    style URL fill:#b45309,color:#fff
    style RSSH fill:#7c3aed,color:#fff
    style SFU fill:#e5e7eb,color:#374151
    style ULBW fill:#e5e7eb,color:#374151
 ```
 ---
@@ -164,6 +168,7 @@ flowchart TB
 | **9.x** | Agent (low) | — | Open |
 | **cluster0** | Agent | NFS/DNS | cast01–03 lab |
 | **SFU** | Agent | owner spec | Hidden |
 | **ULBW** | Agent | 6.1 JNI | DR R0 — [20260617_codec2_ulbw_voice.md](DRs/20260617_codec2_ulbw_voice.md) |
 ---
@@ -176,7 +181,7 @@ ALPHA:    4.rssh deploy (FE stream + BE sshd + app) ───┤
 OPTIONAL: 5.5 RBAC UI click-through ────────────────────┤
 DEV:      6.2 LAN soak ────────────────────────────────┘
-Parallel: cluster0 lab (c1–c3.acl0.f0xx.org), 6.1/6.3–6.6, 9.x, SFU
+Parallel: cluster0 lab (c1–c3.acl0.f0xx.org), 6.1/6.3–6.6, 9.x, SFU, ULBW Codec2 (post-6.1)
 Off graph: 2.x DNS/mail (postponed)
 ```
--- a/docs/OPEN_TASKS_GRAPH.pdf
+++ b/docs/OPEN_TASKS_GRAPH.pdf
--- a/docs/OPUS_SPEEX_VALIDATION.pdf
+++ b/docs/OPUS_SPEEX_VALIDATION.pdf
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--- a/docs/README.md
+++ b/docs/README.md
@@ -87,6 +87,8 @@ Click a link to open a guide. Section links jump within the document (GitHub, Cu
 |----------|---------|
 | [20100611_3_url_shortener.md](DRs/20100611_3_url_shortener.md) | URL shortener — design review (auth, slug algo, task graph). |
 | [20100612_1_scaling.md](DRs/20100612_1_scaling.md) |  |
 | [20260616_rssh_routed_egress.md](DRs/20260616_rssh_routed_egress.md) | RSSH routed egress (postponed). |
 | [20260617_codec2_ulbw_voice.md](DRs/20260617_codec2_ulbw_voice.md) | Codec2 ULBW voice-only cast + SFU negotiation hooks. |
 ---
@@ -124,6 +126,8 @@ Click a link to open a guide. Section links jump within the document (GitHub, Cu
 - [PRO_AAR.md](PRO_AAR.md) — Pro AAR split
 - [USB_HDMI_CAST.md](USB_HDMI_CAST.md) — HDMI / USB-tether
 - [AV_QUALITY_QA_SESSION.md](AV_QUALITY_QA_SESSION.md) — AV enhancement Q&A
 - [DRs/20260617_codec2_ulbw_voice.md](DRs/20260617_codec2_ulbw_voice.md) — Codec2 ULBW voice DR
 - [OPUS_SPEEX_VALIDATION.md](OPUS_SPEEX_VALIDATION.md) — Opus/Speex E2E checklist
 ---
--- a/docs/README.pdf
+++ b/docs/README.pdf
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@@ -0,0 +1,278 @@
 Codec2 / ultra-low-bandwidth (ULBW) voice — research draft
 R0-pre
 severity: low
 state: research (post-alpha candidate; blocked on Opus/Speex JNI baseline)
 author: PO + agent
 date: 2026-06-17
 Problem:
 - PO asked whether Codec2 (or MELP/TWELP-class codecs) should be integrated for voice-only or
  audio-primary paths on very slow links: mesh/BT P2P, marginal LTE, future multipoint relay.
 - Today screen cast defaults to AAC; Opus/Speex are advertised in discovery masks but native
  encode/decode JNI is still TODO (stub → AAC on wire). See ndk/README.md, OPUS_SPEEX_VALIDATION.md.
 - Future F1 multipoint cast (MCU/SFU on BE) will need a single negotiated audio format per room
  or per leg — P2P bitmask negotiation alone will not scale.
 [foxx comment]: it's surprise to me to hear that Opus/Speex is still TODO - reported to be finished by AI
 [AI note]: Negotiation/UI/autolink scaffolding is done; ROADMAP.md lists "Opus/Speex JNI encode/decode sinks" as TODO.
  opus_bridge.c only exposes nativeIsOpusAvailable — wire path is OPUS_STUB→AAC without libopus.a + encode JNI.
  See DR docs/DRs/20260617_codec2_ulbw_voice.md §4.1.
 Scope of this draft:
 - Research + integration sketch only. No Codec2 until Opus/Speex JNI encode/decode lands (ROADMAP 6.1).
 - Covers mobile peer negotiation (today + extensions) and backend MCU/SFU hooks (gray / post-alpha).
 ──────────────────────────────────────────────────────────────────────────────
 1. Codec landscape (skeptical first)
 ──────────────────────────────────────────────────────────────────────────────
 | Codec        | Bitrate      | Sample rate | Quality / role              | License   | Android fit        |
 |--------------|-------------|-------------|-----------------------------|-----------|--------------------|
 | Opus SILK NB | ~6–12 kbps  | 8 kHz       | Good comms; FEC; wide use   | BSD       | Submodule exists   |
 | Speex NB     | ~2–15 kbps  | 8 kHz       | Legacy narrowband           | BSD       | Submodule exists   |
 | Codec2       | 700–3200 bps| 8 kHz       | HF radio; intelligible only | LGPL-2.1  | New submodule      |
 | MELP / TWELP | ~2400 bps   | 8 kHz       | Govt vocoder; patent encumbrance | varies | Poor OSS story |
 | AAC-LC       | 32–128 kbps | 44.1/48 kHz | Screen cast default         | patent    | MediaCodec HW      |
 Skeptical PO questions (answer before building Codec2):
 - Is Codec2 needed if Opus @ 6 kbps + existing FEC/NACK already fits the slow-link budget?
 - Is the use case **voice-only cast** (no video) or **audio leg of screen cast**? Codec2 is 8 kHz
  telephony — downmixing stereo app audio loses music/UI cues; fine for push-to-talk, poor for
  “share my meeting audio”.
 - Codec2 maintainer note (2023+): major re-dev; many modes “not actively maintained”; only 3200 for
  M17 called out as exception. Fork/maintenance risk vs stable Opus.
 - LGPL-2.1: dynamic link via libandroidcast_codecs.so is OK; document in mobile + BE licenses;
  Gitea mirror like opus/speex.
 [foxx comment]: from my past practical experience, Opus@6k+FEC gives a lot more hearable noise and network bandwidth rather than Codec2, so everything just fits its hole and goals; we use AAC legally as a part of Android platform, no conflict there; Codec2 3200bps looks also OK for the goals we want to achieve; MELP/TWELP - skipping that, out of scope because of many slim points using it
 When Codec2 still wins:
 - Sub-3 kbps **sustained** (not burst): BT Classic SPP mesh, APRS-style relay, satellite backhaul.
 - Symmetric **voice-only** sessions where both peers opt into “radio mode” (dev/PO setting).
 - Lab demos comparing Speex vs Codec2 700C on identical packet loss (after Opus baseline exists).
 [foxx comment]: the intent of using Codec2 is not the lab comparison but the desire from end-users to have audio casts on ultra-low bandwidth (better to have something than have nothing, let's say)
 ──────────────────────────────────────────────────────────────────────────────
 2. Current mobile negotiation (P2P LAN / TCP / UDP)
 ──────────────────────────────────────────────────────────────────────────────
 Two parallel paths today — video and audio are **not** negotiated the same way.
 A) Discovery + wire header (both peers, pre-session):
   - CastProtoHeader.audioCodecs / videoCodecs bitmasks (48-byte header, every packet).
   - CastCodecFlags: AUDIO_PCM=1, AAC=2, OPUS=4, SPEEX=8 (room for 16, 32, …).
   - DiscoveryManager advertises localAudioMask() from CastCodecFlags.localAudioMask().
   - Receiver list in UI carries peer audioCodecs → sender picks target.
 B) TCP handshake (video only, CastSession):
   - MSG_CODEC_CAPS → MIME lists (H.264, VP8, …).
   - MSG_CODEC_SELECTED → single negotiated video MIME.
   - Receiver runs CodecNegotiator; sender logs CodecPriorityCatalog decision.
   - **No MSG_AUDIO_SELECTED** — audio is not on this wire sequence.
 C) Audio resolution (sender side, after target known):
   - AudioNegotiator.resolveForSender(settings, peerAudioMask):
       negotiate(localMask, peerMask, user preference, settings).
   - AUTO → CodecPriorityCatalog.decideBestAudioCodec (scores from codecs.json).
   - Explicit pref → mask intersection; fallback to AUTO → AAC.
   - Result stored in CastSettings.resolvedAudioCodec (transient).
   - Wired from ScreenCastService / MultiCastCoordinator.
 D) Stream protection (UDP):
   - Separate post-handshake negotiation (FEC/NACK); independent of codec choice.
 Implications for Codec2:
 - Adding Codec2 requires a new flag bit (e.g. AUDIO_CODEC2 = 16) in CastCodecFlags + proto docs.
 - Must update: localAudioMask(), flagForAudioPreference(), isLocallyAvailable(), CodecPriorityId,
  CastSettings.AudioCodec enum, codecs.json, manualAudioPreferences() order.
 - **Do not** advertise CODEC2 in mask until NativeCodecBridge probe passes (same rule as Opus).
 - Unit tests: AudioNegotiatorTest, CastProtoHeaderTest round-trip, mask intersection cases.
 Gap (intentional for alpha, painful for SFU):
 - Audio choice is **sender-resolved** from discovery masks; receiver is not sent MSG_AUDIO_SELECTED.
 - Receiver must infer from CastSettings in session or mirror sender logic on first audio frame
  (today: implicit via shared settings blob / same negotiation inputs). Document before SFU.
 ──────────────────────────────────────────────────────────────────────────────
 3. Proposed Codec2 mobile integration (minimal diff)
 ──────────────────────────────────────────────────────────────────────────────
 Enum / settings:
 - CastSettings.AudioCodec.CODEC2 (or CODEC2_1300 / CODEC2_700C sub-modes in dev settings).
 - Optional CastSettings.VoiceOnlyMode flag (no video track; skips video handshake).
 Native:
 - third-party/codec2 submodule → scripts/init-third-party-submodules.sh + Gitea mirror.
 - Extend scripts/build-native-codecs.sh + ndk CMake: ANDROIDCAST_HAVE_CODEC2.
 - JNI in NativeCodecBridge: isCodec2Available(), encode/decode 20 ms frames @ 8 kHz mono.
 - Frame format on wire: length-prefixed Codec2 blobs (mode id in session meta or first frame);
  **not** AAC ADTS — new CastProtocol MSG_AUDIO_FRAME subtype or codec tag in existing payload.
 Priority catalog (codecs.json):
 - Default order suggestion if ULBW profile enabled: CODEC2 < OPUS < SPEEX < AAC < PCM.
 - bitrate_score: CODEC2 lowest; internal_score: higher delay penalty (see §5).
 - Profile hook: CastSettings.NetworkAdoption.ESTIMATED or new ULBW_PRESET gates AUTO toward CODEC2
  only when both masks include it AND user/dev “radio mode” on.
 Voice-only cast (optional product slice):
 - Capture: AudioRecord 8 kHz mono (or resample from 48 kHz graph).
 - Skip video encoder; discovery still sends videoCodecs=0 or VIDEO_UNKNOWN.
 - BT / mesh: same negotiation masks over RFCOMM or UDP wrapper — framing spec TBD (§6).
 Milestone order:
 1. Opus + Speex JNI encode/decode (ROADMAP 6.1) — validates pipeline end-to-end.
 2. Codec2 probe + encode/decode behind dev flag.
 3. Voice-only mode + E2E on two devices.
 4. SFU signaling extensions (§4) — only when F1 spec approved.
 ──────────────────────────────────────────────────────────────────────────────
 4. Future backend: MCU / SFU integration
 ──────────────────────────────────────────────────────────────────────────────
 References:
 - docs/20260608_BE_SERVICES_and_infra.md § Planned SFU relay (Janus-class)
 - docs/specs/20100612_1_scaling.md F1 Multipoint cast, be-media-N tier
 - docs/INFRA.md: port 8089 = Janus/other — **not** androidcast PHP vhost; do not mix nginx paths
 - App: SfuRelayGate.PREVIEW_ENABLED = false; CastConfig.ALPHA_FEATURE_FREEZE
 Architecture (target, gray):
    [Sender A]──┐                      ┌──[Receiver B]
                ├──► Signaling (PHP) ──►├── Janus/mediasoup SFU (:8089 or dedicated)
    [Sender C]──┘         │            └── transcode / fan-out
                          RBAC/session
                          room lifecycle
 Negotiation shifts from pairwise bitmask to **room capability contract**:
 | Layer              | P2P today                    | SFU future                                      |
 |--------------------|------------------------------|-------------------------------------------------|
 | Capability advert  | Discovery header masks       | Join-room: client caps JSON + bitmask           |
 | Audio pick         | AudioNegotiator local        | Server publishes room_audio_codec or per-leg    |
 | Video pick         | MSG_CODEC_SELECTED           | WebRTC SDP / simulcast layers                   |
 | Auth               | PIN / LAN                    | Existing session/RBAC + room token              |
 | Transport          | UDP/TCP cast                 | WebRTC (+ optional TURN); LAN cast unchanged    |
 Codec2 on SFU — three realistic modes:
 1) **Passthrough (hardest):** SFU relays Codec2 packets without decode. All clients must speak
   Codec2; no WebRTC browser viewers. Fits closed Android mesh only.
 2) **Transcode at SFU (likely):** Android sends Codec2 or Opus; media worker (ffmpeg/Janus plugin)
   decodes → Opus/VP8 for WebRTC subscribers. PO must budget CPU on be-media-N (scaling SPEC).
   Negotiation: room advertises sfu_audio_ingress: [opus, codec2], egress: opus.
 3) **MCU mix (voice conference):** Decode all legs → PCM mix → encode Opus (or Codec2 for radio
   leg). Codec2 only on “radio bridge” participants, not main room.
 Signaling API sketch (owner spec TBD — not implemented):
 - POST /api/sfu/room — create; body includes max_participants, ingress_caps, egress_caps.
 - POST /api/sfu/room/{id}/join — returns Janus session/handle or mediasoup transport params.
 - Client payload extension (parallel to CastSettings):
    audio_caps: { bitmask, codec2_modes: ["700C","1300"], max_bitrate_bps }
    video_caps: { bitmask, mime_list }
    preference: { audio: "AUTO", network_profile: "ULBW" }
 - Server response:
    negotiated_audio: "opus" | "codec2_1300" | ...
    negotiated_video: mime or null for voice-only
    relay_mode: "p2p" | "sfu" | "mcu"
 Mobile changes when SFU lands:
 - New transport enum value TRANSPORT_WEBRTC (frozen in alpha UI).
 - Before cast: if SfuRelayGate.isAvailable() && room URL → skip LAN discovery masks;
  run SfuSignalingClient.negotiate(roomCaps) → populate CastSettings.resolvedAudioCodec from server.
 - Fallback: LAN P2P unchanged if signaling unreachable (local-first).
 - AudioNegotiator.negotiate() reused for **pre-signaling** pairwise preview; server may override.
 Janus / 8089 caution:
 - FE nginx location /janus/ exists for other stack — androidcast signaling stays on apps.f0xx.org
  PHP API; media UDP ports on dedicated media subnet per scaling DR. No coupling in alpha.
 MCU vs SFU choice (for PO):
 - SFU: lower server CPU if passthrough/simulcast; N subscribers see one encoded stream.
 - MCU: needed for true multiparty voice mix or heterogeneous codecs (Codec2 leg + Opus leg).
 - F1 backlog item — separate SFU SPEC before any Codec2-on-BE work.
 ──────────────────────────────────────────────────────────────────────────────
 5. Peer negotiation — extensions (mobile + protocol)
 ──────────────────────────────────────────────────────────────────────────────
 Short term (Codec2 on P2P, no proto version bump if possible):
 - Reserve CastCodecFlags.AUDIO_CODEC2 = 16.
 - Add optional CastSettings.codec2Mode (1300, 700C, 3200) — must match on both sides; if mismatch,
  AudioNegotiator falls back to next scored codec (same as explicit OPUS unavailable).
 - Consider MSG_AUDIO_SELECTED in TCP handshake (symmetric with video):
    payload: uint32 audio_flag + uint8 mode
  Benefits: receiver logs definitive choice; multi-receiver multicast gets same codec;
  SFU migration reuses message type over WebRTC data channel.
  Cost: proto doc + CastSession serverHandshake/clientHandshake change — schedule with SETTINGS_VERSION bump.
 Medium term (multipoint / SFU):
 - Extend CastSettings SETTINGS_VERSION when adding sfu_room_id, relay_mode, server_negotiated_audio.
 - Discovery header insufficient for 3+ peers — room state lives on signaling server.
 - Per-peer legs: senderMask/receiverMask become N-vectors or server-issued single codec.
 - AudioNegotiator refactor: negotiateRoom(RoomCaps, List<PeerCaps>, preference) → server or elected
  “master” receiver (first joiner) picks; align with CodecNegotiator pattern for video.
 BT / mesh P2P (no BE):
 - Same bitmask in link-local discovery (mDNS or BLE advertisement) — reuse CastProtoHeader layout.
 - Frame timing: Codec2 1600-mode ~ 40 ms frames; BT SPP throughput ~1–3 kbps practical — profile
  700C only; add jitter buffer 80–120 ms (document in AV_QUALITY_QA_SESSION follow-up).
 Delay budget (manage expectations):
 - Codec2 encode+decode + BT latency → 150–300 ms one-way plausible; unacceptable for lip-sync
  with video — reinforce voice-only or audio-only cast for ULBW profile.
 ──────────────────────────────────────────────────────────────────────────────
 6. Testing & validation (when implemented)
 ──────────────────────────────────────────────────────────────────────────────
 Automated:
 - AudioNegotiatorTest: CODEC2 in both masks → selected when scores favor; one side missing → fallback.
 - CastCodecFlags round-trip AUDIO_CODEC2 bit.
 - Native round-trip: c2enc/c2dec parity via JNI on arm64-v8a CI (optional, after submodule).
 Manual E2E (extend OPUS_SPEEX_VALIDATION.md matrix):
 - Voice-only, CODEC2 explicit, two devices, UDP then TCP.
 - AUTO + ESTIMATED network preset on marginal Wi‑Fi (throttle via dev settings).
 - Record: resolvedAudioCodec in diagnostics, audio kbps, subjective MOS notes.
 SFU (post-alpha):
 - Room with 2 Android + 1 ingress Codec2 → verify transcode to Opus for third WebRTC viewer.
 - sfu_health.php enabled; SfuRelayGate preview on dev builds only.
 ──────────────────────────────────────────────────────────────────────────────
 7. Open questions for PO
 ──────────────────────────────────────────────────────────────────────────────
 1. Primary use case: voice-only P2P, or audio leg of screen cast on ULBW?
 2. Accept 8 kHz telephony quality for “radio mode”, or require wideband Opus for anything with video?
 3. Codec2 mode default: 1300 (balance) vs 700C (minimum bits) vs user-selectable?
 4. Proceed with Codec2 at all after Opus @ 6 kbps measured on target BT/mesh hardware?
 5. SFU: passthrough Codec2 vs transcode-only at ingress — which matches commercial story?
 6. MSG_AUDIO_SELECTED in handshake: worth SETTINGS_VERSION bump now, or defer until SFU spec?
 7. MELP/TWELP: drop — insufficient OSS path unless PO has licensed binaries.
 ──────────────────────────────────────────────────────────────────────────────
 8. Recommendation (agent opinion)
 ──────────────────────────────────────────────────────────────────────────────
 Defer Codec2 implementation until:
 - Opus/Speex JNI is real on wire (not stub).
 - PO picks voice-only vs AV-leg scope.
 - One measured session on slow link proves Opus+FEC insufficient.
 If proceeding:
 - Treat Codec2 as dev/ULBW profile codec, not AUTO default.
 - Design bitmask + optional MSG_AUDIO_SELECTED now so SFU room negotiation reuses the same types.
 - Plan BE transcode path (ffmpeg decode Codec2 → Opus) in F1 SFU SPEC — do not assume SFU passthrough.
 Next doc steps:
 - DR: docs/DRs/20260617_codec2_ulbw_voice.md + PDF (done 2026-06-17)
 - SPEC slice in scaling or dedicated docs/specs/…_sfu_audio_negotiation.md when F1 unblocks
 - Ticket: “ULBW voice” → implementation epic after 6.1 green
 Related files:
 - app/.../CastCodecFlags.java, AudioNegotiator.java, CodecPriorityCatalog.java
 - app/.../network/CastSession.java, CastProtoHeader.java, CastProtocol.java
 - app/.../sfu/SfuRelayGate.java
 - ndk/README.md, app/src/main/assets/codecs.json
 - third-party/opus, third-party/speex (pattern for codec2 submodule)
--- a/docs/drafts/20260618_repos_reorganizing.txt
+++ b/docs/drafts/20260618_repos_reorganizing.txt
@@ -0,0 +1,98 @@
 Project repository and structure reorganization draft
 milestone: R0-pre
 severity: high
 state: pre-implementation
 author: Anton Afanasyeu
 date: 2026-06-18
 The problem:
 The project looks like monolith. For better and more atomic support we need to reorganize the whole project repo structure
 The what:
 Current project structure
 Project                         | Placement                     | Repo                                              | State                       | Description
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 AndroidCast all in one          | repo root                     | git://f0xx.org/android_cast                       | monolithic                  | all-in-one project, needs to be splitted
 libvpx                          | third-party/libvpx            | https://chromium.googlesource.com/webm/libvpx     | 3rdparty exported submodule | VPx video codecs
 opus                            | third-party/opus              | https://github.com/xiph/opus                      | 3rdparty exported submodule | Opus voice codec
 speex                           | third-party/speex             | https://github.com/xiph/speex/                    | 3rdparty exported submodule | Speex voice codec
 wireguard                       | third-party/wireguard-android | https://git.zx2c4.com/wireguard-android           | 3rdparty exported submodule | wireguard for android
 url-shortener                   | backend/url-shortener         | git://f0xx.org/androidcast_project/url-shortener  | part of AndroidCast backend | url shortener standalone backend
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 The how:
 Next hope project structure
 AndroidCast project - all in one  | git://f0xx.org/ac
  |-- AndroidCast - common        | @common
  |-- AndroidCast - mobile        | @mobile
  |-- AndroidCast - BE            | @backend
 ... TBD
 AndroidCast project           | Placement (@ - submodule)     | Description                                   |  Repo
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 AndroidCast - common          | @common                       | project all common                            | git://f0xx.org/ac/ac-common
  |-- AndroidCast - docs      | @docs                         | project docs, BE, MS, mobile, web, everything | git://f0xx.org/ac/ac-docs
  |-- AndroidCast - scripts   | @scripts                      | common project scripts                        | git://f0xx.org/ac/ac-scripts
 AndroidCast - mobile          | @mobile                       | mobile app sources                            | git://f0xx.org/ac/ac-mobile
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 AndroidCast - Session Studio  | @session-studio               | offline analytic tools                        | git://f0xx.org/ac/ac-session-studio
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 AndroidCast - BE - MS         | @backend                      | backend microservices common base (UI)        | git://f0xx.org/ac/ac-be-microservice
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 AndroidCast - MS              | @microservices                | microservice commons                          | git://f0xx.org/ac/ac-microservice
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 ... TBD
 AndroidCast BE microservices and their derivatives (OpenAPI providers, any REST API services for web and mobile apps)
 AndroidCast - MS - template <- AndroidCast - MS (@ means suibmodule)                                        |git://f0xx.org/ac/ac-microservice/ac-ms-template 
  | -- AndroidCast - common                     | @common           | project all common                    | git://f0xx.org/ac/ac-common
  | -- AndroidCast - MS - common                | @ms-common        | microservices common                  | git://f0xx.org/ac/ac-microservice/ac-ms-common
    |-- AndroidCast - MS - builder              | @ms-builder       | builder microservice                  | git://f0xx.org/ac/ac-microservice/ac-ms-builder
    |-- AndroidCast - MS - VPN                  | @ms-vpn           | VPN microservice                      | git://f0xx.org/ac/ac-microservice/ac-ms-vpn
      |-- AndroidCast - MS - VPN - RSSH         | @ms-vpn-rssh      | VPN RSSH microservice                 | git://f0xx.org/ac/ac-microservice/ac-ms-vpn-rssh
      |-- AndroidCast - MS - VPN - WireGuard    | @ms-vpn-wireguard | VPN WG microservice                   | git://f0xx.org/ac/ac-microservice/ac-ms-vpn-wireguard
    |-- AndroidCast - MS - VCS                  | @ms-vcs           | VCS  microservice (gitea)             | git://f0xx.org/ac/ac-microservice/ac-ms-vcs
    |-- AndroidCast - MS - URL shortener        | @ms-url-shortener | URL shortener microservice            | git://f0xx.org/ac/ac-microservice/ac-ms-url-shortener
    |-- AndroidCast - MS - analytics            | @ms-analytics     | analytics microservice                | git://f0xx.org/ac/ac-microservice/ac-ms-analytics
    |-- AndroidCast - MS - orchestration        | @ms-orchestration | orchestration microservice            | git://f0xx.org/ac/ac-microservice/ac-ms-orchestration
    |-- AndroidCast - MS - tracker              | @ms-tracker       | issues & tickets tracker microservice | git://f0xx.org/ac/ac-microservice/ac-ms-tracker
    |-- AndroidCast - MS - RBAC                 | @ms-rbac          | RBAC microservice                     | git://f0xx.org/ac/ac-microservice/ac-ms-rbac
 ... TBD
 Sub-project of AndroidCast BE/MS, mostly Web UI stuff, but also should be OpenAPI-compatible and provide services to the mobile app (@ means suibmodule)
 AndroidCast - BE - common <- AndroidCast - BE - MS              | git://f0xx.org/ac/ac-backend
  |-- AndroidCast - BE - vcs (UI)           | @be-vcs           | VCS frontend, former gitea, backend UI  | git://f0xx.org/ac/ac-backend/ac-be-vcs
    |-- AndroidCast - MS - vcs              | @ms-vcs           | VCS microservice (gitea)                | git://f0xx.org/ac/ac-microservice/ac-ms-vcs
  |-- AndroidCast - BE - console (UI)       | @be-console       | git://f0xx.org/ac/ac-backend/ac-be-console              | primary console, ./examples/build_console ? check if it is
    |-- AndroidCast - MS - common           | @ms-common        | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
  |-- AndroidCast - BE - landing (UI)       | @be-landing       | git://f0xx.org/ac/ac-backend/ac-be-landing              | landing page(s), now in ./examples/app_hub
    |-- AndroidCast - MS - common           | @ms-common        | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
  |-- AndroidCast - BE - issues (UI)        | @be-issues        | git://f0xx.org/ac/ac-backend/ac-be-issues               | issues tracker UI, now is in ./examples somewhere
    |-- AndroidCast - MS - tracker          | @ms-tracker       | git://f0xx.org/ac/ac-microservice/ac-ms-tracker         | issues tracker microservice shared base, now is in ./examples somewhere
  |-- AndroidCast - BE - tickets (UI)       | @be-tickets       | git://f0xx.org/ac/ac-backend/ac-be-tickets              | tickets UI, now is in ./examples somewhere
    |-- AndroidCast - MS - tracker          | @ms-tracker       | git://f0xx.org/ac/ac-microservice/ac-ms-tracker         | issues tracker microservice shared base, now is in ./examples somewhere
  |-- AndroidCast - BE - graphs (UI)        | @be-graphs        | git://f0xx.org/ac/ac-backend/ac-be-graphs               | graphs UI, now somewhere in ./examples
    |-- AndroidCast - MS - analytics        | @ms-analytics     | git://f0xx.org/ac/ac-microservice/ac-ms-analytics       | analytics base microservice
  |-- AndroidCast - BE - analytics (UI)     | @be-analytics     | git://f0xx.org/ac/ac-backend/ac-be-analytics            | analytics and statistics web UI
    |-- AndroidCast - MS - analytics        | @ms-analytics     | git://f0xx.org/ac/ac-microservice/ac-ms-analytics       | analytics base microservice
  |-- AndroidCast - BE - remote access (UI) | @be-remote-access | git://f0xx.org/ac/ac-backend/ac-be-remote-access        | remote access (now for vpn, somewhere in ./examples now) UI
    |-- AndroidCast - MS - common           | @ms-commmon       | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
    |-- AndroidCast - MS - VPN              | @ms-vpn           | git://f0xx.org/ac/ac-microservice/ac-ms-vpn             | VPN MS as a dependency
    |-- AndroidCast - MS - RBAC | @ms-rbac  | @ms-rbac          | git://f0xx.org/ac/ac-microservice/ac-ms-rbac            | RBAC MS as a dependency
  |-- AndroidCast - BE - URL shortener (UI) | @be-url-shortener | git://f0xx.org/ac/ac-backend/ac-be-url-shortener        | URL shortener UI, now is in separate submodule
    |-- AndroidCast - MS - URL shortener    | @ms-url-shortener | git://f0xx.org/ac/ac-microservice/ac-ms-url-shortener   | URL shortener microservice, now is in separate submodule
  |-- AndroidCast - BE - builder (UI)       | @be-builder       | git://f0xx.org/ac/ac-backend/ac-be-builder              | orchestration builder UI, now in ./orchestration
    |-- AndroidCast - MS - orchestration    | @ms-orchestration | git://f0xx.org/ac/ac-microservice/ac-ms-orchestration   | orchestration microservice, now in ./orchestration
  |-- AndroidCast - BE - RBAC (UI)          | @be-rbac          | git://f0xx.org/ac/ac-backend/ac-be-rbac                 | RBAC backend, now mixed within ./examples somewhere
    |-- AndroidCast - MS - common           | @ms-common        | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
    |-- AndroidCast - MS - RBAC             | @ms-rbac          | git://f0xx.org/ac/ac-microservice/ac-ms-rbac            | RBAC microservice
  |-- AndroidCast - BE - OTA                | @be-ota           | git://f0xx.org/ac/ac-backend/ac-be-ota                  | OTA BE UI
    |-- AndroidCast - MS - OTA              | @ms-ota           | git://f0xx.org/ac/ac-microservice/ac-ms-ota             | OTA microservice, now intermixed in examples/ota and other commons
 ... TBD
 ms-common (microservices common) needs a sharp eye, it may share project sensitive parts, like common stuff such as shared web sessions, DB access (or should be separated to @be-db-service/@ac-db-service sort of)
--- a/docs/drafts/20260618_repos_reorganizing_r0000.txt
+++ b/docs/drafts/20260618_repos_reorganizing_r0000.txt
@@ -0,0 +1,98 @@
 Project repository and structure reorganization draft
 milestone: R0-pre
 severity: high
 state: pre-implementation
 author: Anton Afanasyeu
 date: 2026-06-18
 The problem:
 The project looks like monolith. For better and more atomic support we need to reorganize the whole project repo structure
 The what:
 Current project structure
 Project                         | Placement                     | Repo                                              | State                       | Description
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 AndroidCast all in one          | repo root                     | git://f0xx.org/android_cast                       | monolithic                  | all-in-one project, needs to be splitted
 libvpx                          | third-party/libvpx            | https://chromium.googlesource.com/webm/libvpx     | 3rdparty exported submodule | VPx video codecs
 opus                            | third-party/opus              | https://github.com/xiph/opus                      | 3rdparty exported submodule | Opus voice codec
 speex                           | third-party/speex             | https://github.com/xiph/speex/                    | 3rdparty exported submodule | Speex voice codec
 wireguard                       | third-party/wireguard-android | https://git.zx2c4.com/wireguard-android           | 3rdparty exported submodule | wireguard for android
 url-shortener                   | backend/url-shortener         | git://f0xx.org/androidcast_project/url-shortener  | part of AndroidCast backend | url shortener standalone backend
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 The how:
 Next hope project structure
 AndroidCast project - all in one  | git://f0xx.org/ac
  |-- AndroidCast - common        | @common
  |-- AndroidCast - mobile        | @mobile
  |-- AndroidCast - BE            | @backend
 ... TBD
 AndroidCast project           | Placement (@ - submodule)     | Description                                   |  Repo
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 AndroidCast - common          | @common                       | project all common                            | git://f0xx.org/ac/ac-common
  |-- AndroidCast - docs      | @docs                         | project docs, BE, MS, mobile, web, everything | git://f0xx.org/ac/ac-docs
  |-- AndroidCast - scripts   | @scripts                      | common project scripts                        | git://f0xx.org/ac/ac-scripts
 AndroidCast - mobile          | @mobile                       | mobile app sources                            | git://f0xx.org/ac/ac-mobile
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 AndroidCast - Session Studio  | @session-studio               | offline analytic tools                        | git://f0xx.org/ac/ac-session-studio
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 AndroidCast - BE - MS         | @backend                      | backend microservices common base (UI)        | git://f0xx.org/ac/ac-be-microservice
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 AndroidCast - MS              | @microservices                | microservice commons                          | git://f0xx.org/ac/ac-microservice
  |-- AndroidCast - common    | @common                       |                                               | git://f0xx.org/ac/ac-common
 ... TBD
 AndroidCast BE microservices and their derivatives (OpenAPI providers, any REST API services for web and mobile apps)
 AndroidCast - MS - template <- AndroidCast - MS (@ means suibmodule)                                        |git://f0xx.org/ac/ac-microservice/ac-ms-template 
  | -- AndroidCast - common                     | @common           | project all common                    | git://f0xx.org/ac/ac-common
  | -- AndroidCast - MS - common                | @ms-common        | microservices common                  | git://f0xx.org/ac/ac-microservice/ac-ms-common
    |-- AndroidCast - MS - builder              | @ms-builder       | builder microservice                  | git://f0xx.org/ac/ac-microservice/ac-ms-builder
    |-- AndroidCast - MS - VPN                  | @ms-vpn           | VPN microservice                      | git://f0xx.org/ac/ac-microservice/ac-ms-vpn
      |-- AndroidCast - MS - VPN - RSSH         | @ms-vpn-rssh      | VPN RSSH microservice                 | git://f0xx.org/ac/ac-microservice/ac-ms-vpn-rssh
      |-- AndroidCast - MS - VPN - WireGuard    | @ms-vpn-wireguard | VPN WG microservice                   | git://f0xx.org/ac/ac-microservice/ac-ms-vpn-wireguard
    |-- AndroidCast - MS - VCS                  | @ms-vcs           | VCS  microservice (gitea)             | git://f0xx.org/ac/ac-microservice/ac-ms-vcs
    |-- AndroidCast - MS - URL shortener        | @ms-url-shortener | URL shortener microservice            | git://f0xx.org/ac/ac-microservice/ac-ms-url-shortener
    |-- AndroidCast - MS - analytics            | @ms-analytics     | analytics microservice                | git://f0xx.org/ac/ac-microservice/ac-ms-analytics
    |-- AndroidCast - MS - orchestration        | @ms-orchestration | orchestration microservice            | git://f0xx.org/ac/ac-microservice/ac-ms-orchestration
    |-- AndroidCast - MS - tracker              | @ms-tracker       | issues & tickets tracker microservice | git://f0xx.org/ac/ac-microservice/ac-ms-tracker
    |-- AndroidCast - MS - RBAC                 | @ms-rbac          | RBAC microservice                     | git://f0xx.org/ac/ac-microservice/ac-ms-rbac
 ... TBD
 Sub-project of AndroidCast BE/MS, mostly Web UI stuff, but also should be OpenAPI-compatible and provide services to the mobile app (@ means suibmodule)
 AndroidCast - BE - common <- AndroidCast - BE - MS              | git://f0xx.org/ac/ac-backend
  |-- AndroidCast - BE - vcs (UI)           | @be-vcs           | VCS frontend, former gitea, backend UI  | git://f0xx.org/ac/ac-backend/ac-be-vcs
    |-- AndroidCast - MS - vcs              | @ms-vcs           | VCS microservice (gitea)                | git://f0xx.org/ac/ac-microservice/ac-ms-vcs
  |-- AndroidCast - BE - console (UI)       | @be-console       | git://f0xx.org/ac/ac-backend/ac-be-console              | primary console, ./examples/build_console ? check if it is
    |-- AndroidCast - MS - common           | @ms-common        | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
  |-- AndroidCast - BE - landing (UI)       | @be-landing       | git://f0xx.org/ac/ac-backend/ac-be-landing              | landing page(s), now in ./examples/app_hub
    |-- AndroidCast - MS - common           | @ms-common        | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
  |-- AndroidCast - BE - issues (UI)        | @be-issues        | git://f0xx.org/ac/ac-backend/ac-be-issues               | issues tracker UI, now is in ./examples somewhere
    |-- AndroidCast - MS - tracker          | @ms-tracker       | git://f0xx.org/ac/ac-microservice/ac-ms-tracker         | issues tracker microservice shared base, now is in ./examples somewhere
  |-- AndroidCast - BE - tickets (UI)       | @be-tickets       | git://f0xx.org/ac/ac-backend/ac-be-tickets              | tickets UI, now is in ./examples somewhere
    |-- AndroidCast - MS - tracker          | @ms-tracker       | git://f0xx.org/ac/ac-microservice/ac-ms-tracker         | issues tracker microservice shared base, now is in ./examples somewhere
  |-- AndroidCast - BE - graphs (UI)        | @be-graphs        | git://f0xx.org/ac/ac-backend/ac-be-graphs               | graphs UI, now somewhere in ./examples
    |-- AndroidCast - MS - analytics        | @ms-analytics     | git://f0xx.org/ac/ac-microservice/ac-ms-analytics       | analytics base microservice
  |-- AndroidCast - BE - analytics (UI)     | @be-analytics     | git://f0xx.org/ac/ac-backend/ac-be-analytics            | analytics and statistics web UI
    |-- AndroidCast - MS - analytics        | @ms-analytics     | git://f0xx.org/ac/ac-microservice/ac-ms-analytics       | analytics base microservice
  |-- AndroidCast - BE - remote access (UI) | @be-remote-access | git://f0xx.org/ac/ac-backend/ac-be-remote-access        | remote access (now for vpn, somewhere in ./examples now) UI
    |-- AndroidCast - MS - common           | @ms-commmon       | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
    |-- AndroidCast - MS - VPN              | @ms-vpn           | git://f0xx.org/ac/ac-microservice/ac-ms-vpn             | VPN MS as a dependency
    |-- AndroidCast - MS - RBAC | @ms-rbac  | @ms-rbac          | git://f0xx.org/ac/ac-microservice/ac-ms-rbac            | RBAC MS as a dependency
  |-- AndroidCast - BE - URL shortener (UI) | @be-url-shortener | git://f0xx.org/ac/ac-backend/ac-be-url-shortener        | URL shortener UI, now is in separate submodule
    |-- AndroidCast - MS - URL shortener    | @ms-url-shortener | git://f0xx.org/ac/ac-microservice/ac-ms-url-shortener   | URL shortener microservice, now is in separate submodule
  |-- AndroidCast - BE - builder (UI)       | @be-builder       | git://f0xx.org/ac/ac-backend/ac-be-builder              | orchestration builder UI, now in ./orchestration
    |-- AndroidCast - MS - orchestration    | @ms-orchestration | git://f0xx.org/ac/ac-microservice/ac-ms-orchestration   | orchestration microservice, now in ./orchestration
  |-- AndroidCast - BE - RBAC (UI)          | @be-rbac          | git://f0xx.org/ac/ac-backend/ac-be-rbac                 | RBAC backend, now mixed within ./examples somewhere
    |-- AndroidCast - MS - common           | @ms-common        | git://f0xx.org/ac/ac-microservice/ac-ms-common          | microservice commons
    |-- AndroidCast - MS - RBAC             | @ms-rbac          | git://f0xx.org/ac/ac-microservice/ac-ms-rbac            | RBAC microservice
  |-- AndroidCast - BE - OTA                | @be-ota           | git://f0xx.org/ac/ac-backend/ac-be-ota                  | OTA BE UI
    |-- AndroidCast - MS - OTA              | @ms-ota           | git://f0xx.org/ac/ac-microservice/ac-ms-ota             | OTA microservice, now intermixed in examples/ota and other commons
 ... TBD
 ms-common (microservices common) needs a sharp eye, it may share project sensitive parts, like common stuff such as shared web sessions, DB access (or should be separated to @be-db-service/@ac-db-service sort of)
--- a/docs/specs/20100611_3_url_shortener.pdf
+++ b/docs/specs/20100611_3_url_shortener.pdf
@@ -305,7 +305,7 @@ endobj
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+/Author (Android Cast project) /CreationDate (D:20260617220502+02'00') /Creator (\(unspecified\)) /Keywords () /ModDate (D:20260617220502+02'00') /Producer (ReportLab PDF Library - \(opensource\)) 
  /Subject (\(unspecified\)) /Title (URL shortener service \204 specification) /Trapped /False
 >>
 endobj
@@ -647,7 +647,7 @@ xref
 trailer
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--- a/docs/specs/20100612_1_scaling.pdf
+++ b/docs/specs/20100612_1_scaling.pdf
@@ -425,7 +425,7 @@ endobj
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+/Author (Android Cast project) /CreationDate (D:20260617220503+02'00') /Creator (\(unspecified\)) /Keywords () /ModDate (D:20260617220503+02'00') /Producer (ReportLab PDF Library - \(opensource\)) 
  /Subject (\(unspecified\)) /Title (Platform scaling and multi-environment architecture \204 specification) /Trapped /False
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@@ -862,7 +862,7 @@ xref
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