copilot
1aae7438bb
Request playback with non-site player types and swap to backup Usher streams on stitched ad breaks; inject vendored vaft into the legacy WebView and expose a Settings toggle. Co-authored-by: Cursor <cursoragent@cursor.com>
41 lines
2.1 KiB
Markdown
41 lines
2.1 KiB
Markdown
# Frosty fork — Twitch ad blocking (DESIGN)
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Personal Forgejo fork of [tommyxchow/frosty](https://github.com/tommyxchow/frosty) that adds **TwitchAdSolutions (vaft)**-style live ad blocking.
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Canonical living plan: session `active-plan.md` for conversation `37b527bf-e540-4753-be1f-39906fe2ba28`. ADR: **ADR-026**.
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## Problem
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Upstream Frosty plays Twitch HLS (native) or `player.twitch.tv` (WebView). Twitch may stitch ad pods into the media playlist (`stitched` / `EXT-X-DATERANGE`). Upstream only **detects** native ad breaks (to avoid bogus latency recovery); it does **not** block ads. Turbo/sub `hide_ads` via linked web session is separate and not a client blocker.
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## Approach (vaft-equivalent)
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Browser vaft hooks `Worker`/`fetch` and rewrites m3u8. Frosty’s native player cannot do that from Dart (`loadUrl` + headers only).
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| Layer | Behavior |
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| --- | --- |
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| Primary token | GQL `PlaybackAccessToken` with `playerType=popout` (vaft `ForceAccessTokenPlayerType`) when Settings `blockTwitchAds` is on |
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| Ad break | Native `adBreakStream` → probe backup types `embed` → `popout` → `autoplay`; accept first Usher multivariant whose sampled media playlist lacks `stitched`; `loadUrl` that URL |
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| Ad end | Restore primary popout Usher URL |
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| WebView | Best-effort inject of vendored `assets/js/vaft.user.js` (not true document-start on Android) |
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| UI | Settings toggle (default on; enabling forces native player); overlay “Blocking ads” |
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## Key code
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- `lib/apis/twitch_ad_solutions.dart` — constants + `TwitchAdFreePlayback`
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- `lib/apis/twitch_gql_api.dart` — `playerType` / `platform`, `fetchPlaylistText`
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- `lib/screens/channel/video/native_video_store.dart` — load + swap
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- `lib/screens/channel/video/video_store.dart` — WebView inject
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- `lib/screens/settings/stores/settings_store.dart` — `blockTwitchAds`
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- `assets/js/vaft.user.js` — upstream TwitchAdSolutions script
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## Non-goals (v1)
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- Upstream PR
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- Full Worker prototype cleaning
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- Third-party proxies
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- HLS segment stripping inside `better_native_video_player` (unless smoke tests demand it)
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## Build
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Flutter **3.47.0** (pinned in `pubspec.yaml`). Local SDK: `/home/yuna/.local/flutter-3.47.0`.
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