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  • avcodec/aacsbr_tablegen : always initialize tables at runtime

    30 novembre 2015, par Ganesh Ajjanagadde
    avcodec/aacsbr_tablegen : always initialize tables at runtime

    This gets rid of virtually useless hardcoded tables hackery. The reason
    
it is useless is that a 320 element lut is anyway placed regardless of

    — enable-hardcoded-tables, from which all necessary tables are trivially
    
derived at runtime at very low cost :
    

    sample benchmark (x86-64, Haswell, GNU/Linux, single run is really
    
what is relevant here since looping drastically changes the bench). Fluctuations
    
are on the order of 10% for the single run test :
    
39400 decicycles in aacsbr_tableinit,       1 runs,      0 skips
    
25325 decicycles in aacsbr_tableinit,       2 runs,      0 skips
    
18475 decicycles in aacsbr_tableinit,       4 runs,      0 skips
    
15008 decicycles in aacsbr_tableinit,       8 runs,      0 skips
    
13016 decicycles in aacsbr_tableinit,      16 runs,      0 skips
    
12005 decicycles in aacsbr_tableinit,      32 runs,      0 skips
    
11546 decicycles in aacsbr_tableinit,      64 runs,      0 skips
    
11506 decicycles in aacsbr_tableinit,     128 runs,      0 skips
    
11500 decicycles in aacsbr_tableinit,     256 runs,      0 skips
    
11183 decicycles in aacsbr_tableinit,     509 runs,      3 skips
    

    Tested with FATE with/without —enable-hardcoded-tables.
    

    Reviewed-by : Rostislav Pehlivanov <atomnuker@gmail.com>
    
Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/aacsbr_fixed_tablegen.c
    • [DH] libavcodec/aacsbr_fixed_tablegen.h
    • [DH] libavcodec/aacsbr_tablegen.c
    • [DH] libavcodec/aacsbr_tablegen.h
    • [DH] libavcodec/aacsbr_tablegen_common.h

  • lavc/dsd_tablegen : always generate tables at runtime

    29 décembre 2015, par Ganesh Ajjanagadde
    lavc/dsd_tablegen : always generate tables at runtime

    Commit b272c3a5aa has sped up dsd_tablegen, and now table generation takes
    
 40k cycles. Thus, these tables can always be generated at runtime.
    

    Tested with/without —enable-hardcoded-tables.
    

    Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/dsd_tablegen.c
    • [DH] libavcodec/dsd_tablegen.h

  • avdevice/decklink_enc : Add support for compressed AC-3 output over SDI

    7 avril 2023, par Devin Heitmueller
    avdevice/decklink_enc : Add support for compressed AC-3 output over SDI

    Extend the decklink output to include support for compressed AC-3,
    
encapsulated using the SMPTE ST 377:2015 standard.
    

    This functionality can be exercised by using the "copy" codec when
    
the input audio stream is AC-3.  For example :
    

    ./ffmpeg -i /foo.ts -codec:a copy -f decklink 'UltraStudio Mini Monitor'
    

    Note that the default behavior continues to be to do PCM output,
    
which means without specifying the copy codec a stream containing
    
AC-3 will be decoded and downmixed to stereo audio before output.
    

    Thanks to Marton Balint for providing feedback.
    

    Signed-off-by : Devin Heitmueller <dheitmueller@ltnglobal.com>
    
Signed-off-by : Marton Balint <cus@passwd.hu>
    • [DH] libavdevice/decklink_enc.cpp

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