claude-noether/libva-v4l2-request-fourier
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ampere-av1 Phase 2 step 4: AV1 dispatch scaffolding compiles and wires

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surface.h: av1 substruct (picture + tile_group_entries[AV1_MAX_TILES=128]
  + num_tile_group_entries counter)
picture.c: dispatch VAPictureParameterBufferAV1 + VASliceParameterBufferAV1
  into surface->params.av1.*; call av1_set_controls in EndPicture path
av1.h: minimal interface (av1_set_controls signature)
av1.c: stub set_controls returning -1 with diagnostic; _Static_assert on
  v4l2_ctrl_av1_tile_group_entry size = 16 (Janet hygiene)
meson.build: av1.c + av1.h in source list

Verified on ampere with /tmp/test_av1.ivf via LIBVA_DRIVER_NAME=v4l2_request:

  v4l2-request: ampere-av1: vpu981 AV1 decoder at /dev/video4 + /dev/media3
  v4l2-request: ampere-av1: av1_set_controls stub — Phase 2.1 will implement ...
  [av1] Failed to end picture decode issue: 1 (operation failed).
  [av1] HW accel end frame fail.
  [dec:av1] Error submitting packet to decoder: Input/output error

Clean graceful failure — vpu981 probe works, dispatch reaches av1.c,
stub returns ERROR, ffmpeg falls back to SW. No crash, no IOMMU fault,
no kernel taint.

Next: Phase 2.1 implementation of fill_sequence + fill_frame +
fill_film_grain + fill_tile_group_entries (~700 LoC mirror of Kwiboo
v4l2_request_av1.c, applying F1/F2/F3 implementation-time corrections
from Janet review v2).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
claude-noether
2026-05-17 09:55:39 +02:00
parent 61db76ebcf
commit 78a9978b02
5 changed files with 177 additions and 0 deletions
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src/surface.h
+13
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@@ -122,6 +122,19 @@ struct object_surface {
VADecPictureParameterBufferVP9 picture;
VASliceParameterBufferVP9 slice;
} vp9;
/*
* ampere-av1-enablement: AV1 needs picture-header +
* variable number of slice/tile params (one per tile).
* tile_group_entries[] holds parsed VASliceParameterBufferAV1
* entries up to MAX_TILES; av1.c builds the matching
* v4l2_ctrl_av1_tile_group_entry[] at set_controls time.
*/
struct {
#define AV1_MAX_TILES 128
VADecPictureParameterBufferAV1 picture;
VASliceParameterBufferAV1 tile_group_entries[AV1_MAX_TILES];
unsigned int num_tile_group_entries;
} av1;
} params;
int request_fd;