claude-noether/libva-v4l2-request-fourier
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fresnel-fourier iter5b-β Phase 7 fix-forward commit D: destination_* for vaapi-copy late-surface flow

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Phase 7 empirical: all 5 libva codecs returned all-zero because
CreateContext's surfaces_ids[] walk was a no-op for ffmpeg-vaapi-copy
which passes surfaces_count=0 to vaCreateContext (per the iter6
comment at context.c:262). Surfaces existed in driver_data's
surface_heap but weren't in the param array → destination_* stayed
at the zero initialization from CreateSurfaces2 β → BeginPicture's
surface_bind_slot saw destination_planes_count=0 → no data
assignment → copy_surface_to_image read all-zero.

Fix: cache the format-uniform CAPTURE geometry in driver_data
(fmt_valid, fmt_planes_count, fmt_buffers_count, fmt_format_height,
fmt_sizes[], fmt_bytesperlines[]). Populate at CreateContext after
v4l2_get_format(CAPTURE). Walk surface_heap (not just surfaces_ids[])
to fill every existing surface. Add lazy-fill in CreateSurfaces2 for
surfaces created AFTER CreateContext. Invalidate cache in
DestroyContext.

New helper: surface_fill_format_uniform(driver_data, surface_object).
Idempotent on destination_planes_count != 0.

Signed-off-by: claude-noether <claude-noether@reauktion.de>
This commit is contained in:
claude-noether
2026-05-12 18:52:33 +00:00
parent 7055b14f5e
commit 70196f8065
4 changed files with 135 additions and 34 deletions
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src/surface.h
+21
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@@ -165,6 +165,27 @@ VAStatus RequestExportSurfaceHandle(VADriverContextP context,
VASurfaceID surface_id, uint32_t mem_type,
uint32_t flags, void *descriptor);
/*
* iter5b-β Commit D: populate a surface's format-uniform destination_*
* fields (planes_count, buffers_count, offsets, sizes, bytesperlines)
* from driver_data's cached CAPTURE-side geometry. Idempotent: skip
* if already filled (destination_planes_count != 0). Caller must
* ensure driver_data->fmt_valid is true (CreateContext has run).
*
* Called by:
* - context.c::RequestCreateContext after v4l2_get_format(CAPTURE)
* populates the cache; walks the surface_heap and fills every
* existing surface (covers surfaces created before CreateContext,
* including the ffmpeg vaapi-copy case where surfaces_count=0 is
* passed but surfaces exist in the heap from earlier
* CreateSurfaces2 calls).
* - surface.c::RequestCreateSurfaces2 after surface allocation,
* covering the case where CreateContext fired before this
* CreateSurfaces2 call (fmt cache is valid, fill immediately).
*/
void surface_fill_format_uniform(struct request_data *driver_data,
struct object_surface *surface_object);
/*
* Iter2 Fix 3: bind / unbind a CAPTURE-pool slot to an object_surface.
* Called from picture.c::RequestBeginPicture (acquire+bind) and