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iter39 fresnel fix: skip pre-S_FMT NV15 CAPTURE format probe

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RK3399 rkvdec advertises NV15 in VIDIOC_ENUM_FMT(CAPTURE) only AFTER
S_FMT(OUTPUT) + S_EXT_CTRLS(SPS) resolve image_fmt to 420_10BIT.
Pre-flight v4l2_find_format(NV15) always returns 0 → video_format
stays NULL → CreateContext returns OPERATION_FAILED → ffmpeg-vaapi
hwaccel init fails with "Failed to create decode context: 1".

Verified on fresnel (kernel 7.0-14 / linux-fresnel-fourier):
  v4l2-ctl -d /dev/video1 --list-formats → only NV12 enumerated

Fix: for 10-bit profiles, skip the find_format probe and directly
map to our NV15 video_format entry. The later S_FMT(CAPTURE) in
the same RequestCreateContext path commits the actual NV15 mode
once the synthetic-SPS injection sets bit_depth_luma_minus8=2.

Discovered during Phase 7 sub-profile verification — Criterion 1
(vainfo enumeration) PASSed but Criteria 2/3 (Hi10P/Main10 decode)
failed with the hwaccel init error. iter38 5/5 baseline still PASSES
(no regression — non-10-bit path unchanged).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Claude (noether)
2026-05-17 16:34:14 +00:00
parent f0ef69d279
commit a13215de45
1 changed files with 11 additions and 5 deletions
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src/context.c
+10 -4
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@@ -142,10 +142,16 @@ VAStatus RequestCreateContext(VADriverContextP context, VAConfigID config_id,
if (found)
video_format = video_format_find(V4L2_PIX_FMT_NV12);
} else {
found = v4l2_find_format(driver_data->video_fd,
V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
V4L2_PIX_FMT_NV15);
if (found)
/*
* iter39 fresnel fix: rkvdec only advertises NV15 in
* VIDIOC_ENUM_FMT(CAPTURE) AFTER S_FMT(OUTPUT) +
* S_EXT_CTRLS(SPS) resolve image_fmt to 420_10BIT.
* Before that, only NV12 is enumerated. Pre-finding
* NV15 always fails. Skip the find_format check and
* directly map to our NV15 video_format entry; the
* later S_FMT(CAPTURE) commits the actual NV15 mode
* once the synthetic SPS sets bit_depth_luma_minus8=2.
*/
video_format = video_format_find(V4L2_PIX_FMT_NV15);
}