H.264 stateless controls were upstreamed to the kernel some time after
this library went dormant. The struct names match exactly (the kernel
adopted v4l2_ctrl_h264_{sps,pps,scaling_matrix,pred_weights,slice_params,
decode_params} and v4l2_h264_{weight_factors,dpb_entry,reference}
verbatim) so the duplicated copies in include/h264-ctrls.h trigger
redefinition errors as soon as any source file pulls in
<linux/videodev2.h> (which transitively pulls in <linux/v4l2-controls.h>).
Same fix as hevc-ctrls.h in commit 4ccbfe9: replace the bundled struct
definitions with a passthrough to <linux/v4l2-controls.h>. The CID
prefix changed during upstreaming from V4L2_CID_MPEG_VIDEO_H264_* to
V4L2_CID_STATELESS_H264_*; provide compatibility aliases so h264.c keeps
compiling. V4L2_PIX_FMT_H264_SLICE is already in <linux/videodev2.h>
(same fourcc value, same name we renamed to in commit c1f5108) so no
need to redefine.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
test0r
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