enricobuehler
4b1bbfdf0e
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Stage 1.5: on Intel/AMD clients libavcodec's VAAPI hwaccel decodes on the GPU; frames map to DRM-PRIME dmabufs (av_hwframe_map, zero copy) and reach GTK as GdkDmabufTexture (BT.709 limited CICP color state — GDK's dmabuf default is BT.601). Inside GtkGraphicsOffload that is the decoder-to-subsurface path, direct-scanout eligible when fullscreen. Fallback ladder, live-verified on the NVIDIA dev box: no VAAPI device -> software decode at session start (logged reason); a mid-session VAAPI error (e.g. broken nvidia-vaapi-driver) demotes to software and the host's IDR/RFI recovery resynchronizes; a rejected dmabuf import logs and the stream continues. PUNKTFUNK_DECODER=software|vaapi overrides; the first-frame log now names the active path. The hwaccel path is raw ffmpeg-sys FFI (ffmpeg-next wraps none of it): hw device ctx + get_format pinned to AV_PIX_FMT_VAAPI (NONE on mismatch so cpu-fallback never silently engages inside libavcodec), thread_count=1, LOW_DELAY. Surface lifetime rides DrmFrameGuard into the texture's release func — GDK runs it on both success and failure. Needs an Intel/AMD client box (Steam Deck/Bazzite) to live-verify the hardware path; the software path is unchanged and revalidated. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>