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/request.h
+21
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@@ -90,7 +90,28 @@ struct request_data {
* which is naturally one-shot per context cycle; no caching is
* required. DestroyContext + next CreateContext rebuild from
* scratch.
*
* iter5b-β Commit D: cache the format-uniform CAPTURE-side
* geometry from v4l2_get_format so CreateSurfaces2 can populate
* a newly-created surface's destination_* fields without
* re-querying the device. Set by CreateContext after the
* v4l2_get_format(CAPTURE) call; consumed by both:
* 1. CreateContext's surface_heap walk (fills surfaces that
* pre-exist when CreateContext fires);
* 2. CreateSurfaces2's per-surface init (fills surfaces
* created AFTER CreateContext, e.g. ffmpeg vaapi-copy
* pool dynamics where the consumer passes surfaces_count=0
* to vaCreateContext and creates surfaces lazily).
*
* fmt_valid is true once CreateContext has populated the cache;
* CreateSurfaces2 only lazy-fills when fmt_valid is true.
*/
bool fmt_valid;
unsigned int fmt_format_height;
unsigned int fmt_planes_count;
unsigned int fmt_buffers_count;
unsigned int fmt_sizes[VIDEO_MAX_PLANES];
unsigned int fmt_bytesperlines[VIDEO_MAX_PLANES];
};
VAStatus VA_DRIVER_INIT_FUNC(VADriverContextP context);