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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 (...)

  • ANNEXE : Les plugins utilisés spécifiquement pour la ferme

    5 mars 2010, par

    Le site central/maître de la ferme a besoin d’utiliser plusieurs plugins supplémentaires vis à vis des canaux pour son bon fonctionnement. le plugin Gestion de la mutualisation ; le plugin inscription3 pour gérer les inscriptions et les demandes de création d’instance de mutualisation dès l’inscription des utilisateurs ; le plugin verifier qui fournit une API de vérification des champs (utilisé par inscription3) ; le plugin champs extras v2 nécessité par inscription3 (...)

  • Problèmes fréquents

    10 mars 2010, par

    PHP et safe_mode activé
    Une des principales sources de problèmes relève de la configuration de PHP et notamment de l’activation du safe_mode
    La solution consiterait à soit désactiver le safe_mode soit placer le script dans un répertoire accessible par apache pour le site

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  • libavutil : add an FFT & MDCT implementation

    2 mai 2019, par Lynne
    libavutil : add an FFT & MDCT implementation

    This commit adds a new API to libavutil to allow for arbitrary transformations
    
on various types of data.
    
This is a partly new implementation, with the power of two transforms taken
    
from libavcodec/fft_template, the 5 and 15-point FFT taken from mdct15, while
    
the 3-point FFT was written from scratch.
    
The (i)mdct folding code is taken from mdct15 as well, as the mdct_template
    
code was somewhat old, messy and not easy to separate.
    

    A notable feature of this implementation is that it allows for 3xM and 5xM
    
based transforms, where M is a power of two, e.g. 384, 640, 768, 1280, etc.
    
AC-4 uses 3xM transforms while Siren uses 5xM transforms, so the code will
    
allow for decoding of such streams.
    
A non-exaustive list of supported sizes :
    
4, 8, 12, 16, 20, 24, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240,
    
256, 320, 384, 480, 512, 640, 768, 960, 1024, 1280, 1536, 1920, 2048, 2560...
    

    The API was designed such that it allows for not only 1D transforms but also
    
2D transforms of certain block sizes. This was partly on accident as the stride
    
argument is required for Opus MDCTs, but can be used in the context of a 2D
    
transform as well.
    
Also, various data types would be implemented eventually as well, such as
    
"double" and "int32_t".
    

    Some performance comparisons with libfftw3f (SIMD disabled for both) :
    
120 :
    
  22353 decicycles in     fftwf_execute,     1024 runs,      0 skips
    
  21836 decicycles in compound_fft_15x8,     1024 runs,      0 skips
    

    128 :
    
  22003 decicycles in       fftwf_execute,   1024 runs,      0 skips
    
  23132 decicycles in monolithic_fft_ptwo,   1024 runs,      0 skips
    

    384 :
    
  75939 decicycles in      fftwf_execute,    1024 runs,      0 skips
    
  73973 decicycles in compound_fft_3x128,    1024 runs,      0 skips
    

    640 :
    
 104354 decicycles in       fftwf_execute,   1024 runs,      0 skips
    
 149518 decicycles in compound_fft_5x128,    1024 runs,      0 skips
    

    768 :
    
 109323 decicycles in      fftwf_execute,    1024 runs,      0 skips
    
 164096 decicycles in compound_fft_3x256,    1024 runs,      0 skips
    

    960 :
    
 186210 decicycles in      fftwf_execute,    1024 runs,      0 skips
    
 215256 decicycles in compound_fft_15x64,    1024 runs,      0 skips
    

    1024 :
    
 163464 decicycles in       fftwf_execute,   1024 runs,      0 skips
    
 199686 decicycles in monolithic_fft_ptwo,   1024 runs,      0 skips
    

    With SIMD we should be faster than fftw for 15xM transforms as our fft15 SIMD
    
is around 2x faster than theirs, even if our ptwo SIMD is slightly slower.
    

    The goal is to remove the libavcodec/mdct15 code and deprecate the
    
libavcodec/avfft interface once aarch64 and x86 SIMD code has been ported.
    
New code throughout the project should use this API.
    

    The implementation passes fate when used in Opus, AAC and Vorbis, and the output
    
is identical with ATRAC9 as well.
    • [DH] libavutil/Makefile
    • [DH] libavutil/tx.c
    • [DH] libavutil/tx.h

  • avfilter/vf_vpp_qsv : add scale mode option

    24 février 2021, par Fei Wang
    avfilter/vf_vpp_qsv : add scale mode option

    The option allow user to set diffenent scaling mode from
    
auto/low-power/high-quality.
    

    More details :
    
https://github.com/Intel-Media-SDK/MediaSDK/blob/master/doc/mediasdk-man.md#mfxExtVPPScaling
    

    Signed-off-by : Fei Wang <fei.w.wang@intel.com>
    
Signed-off-by : Linjie Fu <linjie.justin.fu@gmail.com>
    • [DH] libavfilter/vf_vpp_qsv.c

  • avfilter/af_headphone : Remove pointless additions

    28 août 2020, par Andreas Rheinhardt
    avfilter/af_headphone : Remove pointless additions

    buffer_length is a power-of-two and modulo is buffer_length - 1, so that
    
buffer_length & modulo is zero.
    

    Reviewed-by : Paul B Mahol <onemda@gmail.com>
    
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavfilter/af_headphone.c

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