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• avutil/pixdesc: deprecate AV_PIX_FMT_FLAG_PSEUDOPAL

  29 March 2018, by wm4

  avutil/pixdesc: deprecate AV_PIX_FMT_FLAG_PSEUDOPAL
  PSEUDOPAL pixel formats are not paletted, but carried a palette with the
  
  intention of allowing code to treat unpaletted formats as paletted. The
  
  palette simply mapped the byte values to the resulting RGB values,
  
  making it some sort of LUT for RGB conversion.
  It was used for 1 byte formats only: RGB4_BYTE, BGR4_BYTE, RGB8, BGR8,
  
  GRAY8. The first 4 are awfully obscure, used only by some ancient bitmap
  
  formats. The last one, GRAY8, is more common, but its treatment is
  
  grossly incorrect. It considers full range GRAY8 only, so GRAY8 coming
  
  from typical Y video planes was not mapped to the correct RGB values.
  
  This cannot be fixed, because AVFrame.color_range can be freely changed
  
  at runtime, and there is nothing to ensure the pseudo palette is
  
  updated.
  Also, nothing actually used the PSEUDOPAL palette data, except xwdenc
  
  (trivially changed in the previous commit). All other code had to treat
  
  it as a special case, just to ignore or to propagate palette data.
  In conclusion, this was just a very strange old mechnaism that has no
  
  real justification to exist anymore (although it may have been nice and
  
  useful in the past). Now it's an artifact that makes the API harder to
  
  use: API users who allocate their own pixel data have to be aware that
  
  they need to allocate the palette, or FFmpeg will crash on them in
  
  _some_ situations. On top of this, there was no API to allocate the
  
  pseuo palette outside of av_frame_get_buffer().
  This patch not only deprecates AV_PIX_FMT_FLAG_PSEUDOPAL, but also makes
  
  the pseudo palette optional. Nothing accesses it anymore, though if it's
  
  set, it's propagated. It's still allocated and initialized for
  
  compatibility with API users that rely on this feature. But new API
  
  users do not need to allocate it. This was an explicit goal of this
  
  patch.
  Most changes replace AV_PIX_FMT_FLAG_PSEUDOPAL with FF_PSEUDOPAL. I
  
  first tried #ifdefing all code, but it was a mess. The FF_PSEUDOPAL
  
  macro reduces the mess, and still allows defining FF_API_PSEUDOPAL to 0.
  Passes FATE with FF_API_PSEUDOPAL enabled and disabled. In addition,
  
  FATE passes with FF_API_PSEUDOPAL set to 1, but with allocation
  
  functions manually changed to not allocating a palette.
  

  • [DH] doc/APIchanges
  • [DH] fftools/ffprobe.c
  • [DH] libavcodec/decode.c
  • [DH] libavcodec/ffv1dec.c
  • [DH] libavcodec/rawdec.c
  • [DH] libavcodec/smvjpegdec.c
  • [DH] libavfilter/drawutils.c
  • [DH] libavfilter/framepool.c
  • [DH] libavfilter/vf_crop.c
  • [DH] libavfilter/vf_pixdesctest.c
  • [DH] libavfilter/vf_scale.c
  • [DH] libavfilter/vf_shuffleplanes.c
  • [DH] libavutil/frame.c
  • [DH] libavutil/imgutils.c
  • [DH] libavutil/internal.h
  • [DH] libavutil/pixdesc.c
  • [DH] libavutil/pixdesc.h
  • [DH] libavutil/version.h
  • [DH] libswscale/swscale_internal.h

• Evolution #2802: Échapper le caractère d’échappement

  26 December 2017, by cam.lafit -

  Salut

  vu que \ est un caractères spécial , il semble logique qu’il soit
  traité comme les autres.La possibilité de l’échapper semble cohérent.

• lavu,lavfi,ffmpeg: Remove experimental OpenCL API

  14 November 2017, by Mark Thompson

  lavu,lavfi,ffmpeg: Remove experimental OpenCL API
  This was added in early 2013 and abandoned several months later; as far as
  
  I can tell, there are no external users.  Future OpenCL use will be via
  
  hwcontext, which requires neither special OpenCL-only API nor global state
  
  in libavutil.
  All internal users are also deleted - this is just the unsharp filter
  
  (replaced by unsharp_opencl, which is more flexible) and the deshake filter
  
  (no replacement).
  

  • [DH] configure
  • [DH] doc/APIchanges
  • [DH] doc/filters.texi
  • [DH] doc/utils.texi
  • [DH] fftools/Makefile
  • [DH] fftools/cmdutils.h
  • [DH] fftools/cmdutils_opencl.c
  • [DH] libavfilter/Makefile
  • [DH] libavfilter/allfilters.c
  • [DH] libavfilter/deshake.h
  • [DH] libavfilter/deshake_opencl.c
  • [DH] libavfilter/deshake_opencl.h
  • [DH] libavfilter/deshake_opencl_kernel.h
  • [DH] libavfilter/opencl_allkernels.c
  • [DH] libavfilter/opencl_allkernels.h
  • [DH] libavfilter/unsharp.h
  • [DH] libavfilter/unsharp_opencl.c
  • [DH] libavfilter/unsharp_opencl.h
  • [DH] libavfilter/unsharp_opencl_kernel.h
  • [DH] libavfilter/vf_deshake.c
  • [DH] libavfilter/vf_unsharp.c
  • [DH] libavutil/Makefile
  • [DH] libavutil/opencl.c
  • [DH] libavutil/opencl.h
  • [DH] libavutil/opencl_internal.c
  • [DH] libavutil/opencl_internal.h