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  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • Multilang : améliorer l’interface pour les blocs multilingues

    18 février 2011, par

    Multilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
    Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela.

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

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  • avcodec/mpegaudio_tablegen : speed up dynamic table creation

    25 novembre 2015, par Ganesh Ajjanagadde
    avcodec/mpegaudio_tablegen : speed up dynamic table creation

    This does some miscellaneous stuff mainly avoiding the usage of pow to
    
achieve significant speedups. This is not speed critical, but is
    
unnecessary latency and cycles wasted for a user.
    

    All tables tested and are identical to the old ones
    
(bit-exact even in floating point case).
    

    Sample benchmark (x86-64, Haswell, GNU/Linux) :
    
old :
    
102329530 decicycles in mpegaudio_tableinit,       1 runs,      0 skips
    

    new :
    
34111900 decicycles in mpegaudio_tableinit,       1 runs,      0 skips
    

    Reviewed-by : Ronald S. Bultje <rsbultje@gmail.com>
    
Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] libavcodec/mpegaudio_tablegen.c
    • [DH] libavcodec/mpegaudio_tablegen.h

  • avcodec/cbrt_tablegen : speed up dynamic table creation

    25 novembre 2015, par Ganesh Ajjanagadde
    avcodec/cbrt_tablegen : speed up dynamic table creation

    On systems having cbrt, there is no reason to use the slow pow function.
    

    Sample benchmark (x86-64, Haswell, GNU/Linux) :
    
new :
    
5124920 decicycles in cbrt_tableinit,       1 runs,      0 skips
    

    old :
    
12321680 decicycles in cbrt_tableinit,       1 runs,      0 skips
    

    Reviewed-by : Ronald S. Bultje <rsbultje@gmail.com>
    
Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] libavcodec/cbrt_tablegen.h
    • [DH] libavcodec/cbrt_tablegen_template.c

  • avcodec/aac_tablegen : speed up table initialization

    26 novembre 2015, par Ganesh Ajjanagadde
    avcodec/aac_tablegen : speed up table initialization

    This speeds up aac_tablegen to a ludicruous degree ( 97%), i.e to the point
    
where it can be argued that runtime initialization can always be done instead of
    
hard-coded tables. The only cost is essentially a trivial increase in
    
the stack size.
    

    Even if one does not care about this, the patch also improves accuracy
    
as detailed below.
    

    Performance :
    
Benchmark obtained by looping 10^4 times over ff_aac_tableinit.
    

    Sample benchmark (x86-64, Haswell, GNU/Linux) :
    
old :
    
1295292 decicycles in ff_aac_tableinit,     512 runs,      0 skips
    
1275981 decicycles in ff_aac_tableinit,    1024 runs,      0 skips
    
1272932 decicycles in ff_aac_tableinit,    2048 runs,      0 skips
    
1262164 decicycles in ff_aac_tableinit,    4096 runs,      0 skips
    
1256720 decicycles in ff_aac_tableinit,    8192 runs,      0 skips
    

    new :
    
21112 decicycles in ff_aac_tableinit,     511 runs,      1 skips
    
21269 decicycles in ff_aac_tableinit,    1023 runs,      1 skips
    
21352 decicycles in ff_aac_tableinit,    2043 runs,      5 skips
    
21386 decicycles in ff_aac_tableinit,    4080 runs,     16 skips
    
21299 decicycles in ff_aac_tableinit,    8173 runs,     19 skips
    

    Accuracy :
    
The previous code was resulting in needless loss of
    
accuracy due to the pow being called in succession. As an illustration
    
of this :
    
ff_aac_pow34sf_tab[3]
    
old : 0.000000000007598092294225
    
new : 0.000000000007598091426864
    
real : 0.000000000007598091778545
    

    truncated to float
    
old : 0.000000000007598092294225
    
new : 0.000000000007598091426864
    
real : 0.000000000007598091426864
    

    showing that the old value was not correctly rounded. This affects a
    
large number of elements of the array.
    

    Patch tested with FATE.
    

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

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