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docs: record the FFmpeg/SDL pixel-format naming trap in memory

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Florian Egger
2026-09-07 11:27:59 +02:00
parent 64ab9c5f74
commit dcbcde6410
1 changed files with 5 additions and 0 deletions
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.agents/MEMORY.md
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@@ -75,6 +75,11 @@ loopback validation pending. See bottom for the run commands.
signaling/discovery). IPv4 only at the transport level for now. signaling/discovery). IPv4 only at the transport level for now.
- Rendering: **SDL3** (`sdl3` pkg-config, 3.4 installed); plain texture - Rendering: **SDL3** (`sdl3` pkg-config, 3.4 installed); plain texture
upload, no GPU pipeline yet. upload, no GPU pipeline yet.
- **Pixel-format convention trap**: FFmpeg names packed formats in memory
byte order (AV_PIX_FMT_RGBA = R,G,B,A in memory), but SDL names 32-bit
formats MSB-first (SDL_PIXELFORMAT_RGBA8888 = A,B,G,R in memory).
FFmpeg RGBA data therefore needs SDL_PIXELFORMAT_ABGR8888 — using
RGBA8888 paints the alpha byte as red (red-tinted image).
- Discovery: mDNS/Avahi. - Discovery: mDNS/Avahi.
- Namespace: `sc`. - Namespace: `sc`.
- Module error results use per-module `std::variant<T, XError>` types - Module error results use per-module `std::variant<T, XError>` types