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• avutil/timecode : add ff_timecode_set_smpte

  22 février, par Timo Rothenpieler

  avutil/timecode: add ff_timecode_set_smpte
  

  • [DH] libavutil/Makefile
  • [DH] libavutil/timecode.c
  • [DH] libavutil/timecode_internal.c
  • [DH] libavutil/timecode_internal.h

• vulkan : workaround BGR storage image undefined behaviour

  22 février, par Lynne

  vulkan: workaround BGR storage image undefined behaviour
  

  • [DH] libavutil/vulkan.c

• hwcontext_vulkan : enable read/write without storage

  22 février, par Lynne

  hwcontext_vulkan: enable read/write without storage
  
  BGR formats in Vulkan cannot be used in storage images, as the
  pixel labels on storage images are always ordered as RGB, and
  swizzling is not an option due to old hardware limitations.
  This means that you must always use an RGB format and manually
  swizzle when reading or writing to BGR images, or simply not use
  a format in the shader itself.
  This adds support for the latter.
  

  • [DH] libavutil/hwcontext_vulkan.c

• lavc/vvc : Ensure subpictures don't overlap

  22 février, par Frank Plowman

  lavc/vvc: Ensure subpictures don't overlap
  
  This is essentially a re-implementation of
  https://patchwork.ffmpeg.org/project/ffmpeg/patch/20241005223955.54158-1-post@frankplowman.com/
  
  That patch was not applied last time.  Instead we opted to identify
  issues which could be caused by invalid subpicture layouts and remedy
  those issues where they manifest, either through error detection or code
  hardening.  This was primarily implemented in the set
  https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=13381.
  
  This has worked to some degree, however issues with subpicture layouts
  continue to crop up from the fuzzer and I've fixed a number of bugs
  related to subpicture layouts since then.  I think it's best to return
  to the initial plan and simply check if the subpicture layout is valid
  initially.
  
  This implementation is also lighter than the first time -- by doing a
  bit more logic in pps_subpic_less_than_one_tile_slice, we are able to
  store a tile_in_subpic map rather than a ctu_in_subpic map.  This
  reduces the size of the map to the point it becomes possible to allocate
  it on the stack.  Similar to 8bd66a8c9587af61c7b46558be3c4ee317c1af5a,
  the layout is also validated in the slice map construction code, rather
  than in the CBS, which avoids duplicating some logic.
  
  Signed-off-by: Frank Plowman <post@frankplowman.com>
  

  • [DH] libavcodec/vvc/ps.c

• lavc/vvc : Fix slice map construction for small subpics

  22 février, par Frank Plowman

  lavc/vvc: Fix slice map construction for small subpics
  
  In the case pps_subpic_less_than_one_tile_slice is called, the
  subpicture is smaller than the tile and so there are multiple
  subpictures in the tile.  Of course, then, not all the
  subpictures can start in the top-left corner as the code before the
  patch does.  Patch fixes this, so each subpicture starts at the
  signalled location as is specified in section 6.5.1 of H.266(V3).
  
  Signed-off-by: Frank Plowman <post@frankplowman.com>
  

  • [DH] libavcodec/vvc/ps.c