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  • avfilter,swresample,swscale : use fabs, fabsf instead of FFABS

    12 octobre 2015, par Ganesh Ajjanagadde
    avfilter,swresample,swscale : use fabs, fabsf instead of FFABS

    It is well known that fabs and fabsf are at least as fast and sometimes
    
faster than the FFABS macro, at least on the gcc+glibc combination.
    
For instance, see the reference :
    
http://patchwork.sourceware.org/patch/6735/.
    
This was a patch to glibc in order to remove their usages of a macro.
    

    The reason essentially boils down to fabs using the __builtin_fabs of
    
the compiler, while FFABS needs to infer to not use a branch and to
    
simply change the sign bit. Usually the inference works, but sometimes
    
it does not. This may be easily checked by looking at the asm.
    

    This also has the added benefit of reducing macro usage, which has
    
problems with side-effects.
    

    Note that avcodec is not handled here, as it is huge and
    
most things there are integer arithmetic anyway.
    

    Tested with FATE.
    

    Reviewed-by : Clément Bœsch <u@pkh.me>
    
Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] libavfilter/af_stereotools.c
    • [DH] libavfilter/avf_avectorscope.c
    • [DH] libavfilter/avf_showcqt.c
    • [DH] libavfilter/avf_showfreqs.c
    • [DH] libavfilter/f_ebur128.c
    • [DH] libavfilter/vf_blend.c
    • [DH] libavfilter/vf_dctdnoiz.c
    • [DH] libavfilter/vf_framerate.c
    • [DH] libavfilter/vf_hqdn3d.c
    • [DH] libavformat/mux.c
    • [DH] libswresample/swresample-test.c

  • lavc/exrdsp : unroll predictor

    11 novembre 2023, par Rémi Denis-Courmont
    lavc/exrdsp : unroll predictor

    With explicit unrolling, we can skip half of the sign bit flips, and
    
the compiler is then better able to optimise the scalar loop :
    

    predictor_c : 31376.0 (before)
    
predictor_c : 23703.0 (after)
    • [DH] libavcodec/exrdsp.c

  • avcodec/mpegvideo_enc : Remove slice structured mode from H.263 as well as the code...

    22 novembre 2015, par Michael Niedermayer
    avcodec/mpegvideo_enc : Remove slice structured mode from H.263 as well as the code automatically enabing it

    There is no such thing as a slice structured mode in the original version 1  H.263,
    
that mode was added in H.263+ in 1998. Also the headers for slice structured mode
    
are not part of the older version 1 and this would result in unplayable files
    

    An alternative to this patch would be to merge the H263 and H263P AVCodecs and use
    
other means to distinguish the older and newer versions.
    

    Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/mpegvideo_enc.c

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