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    Il faut au préalable rajouter un champ "Date de publication" dans le masque de formulaire adéquat :
    Administrer > Configuration des masques de formulaires > Sélectionner "Un média"
    Dans la rubrique "Champs à ajouter, cocher "Date de publication "
    Cliquer en bas de la page sur Enregistrer

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  • avcodec/wmaprodec : Make decoders init-threadsafe

    5 mai 2021, par Andreas Rheinhardt
    avcodec/wmaprodec : Make decoders init-threadsafe

    In this case this actually fixes a potential data race : The static VLC
    
tables were reinitialized every time an AVCodecContext has been
    
initialized ; while the mutex in avcodec_open2() ensured that the VLCs
    
could not be initialized concurrently by multiple threads, nothing
    
guaranteed that these VLCs are not read concurrently (when decoding a
    
packet with an already initialized AVCodecContext) while another thread
    
initializes them. This is undefined behaviour despite the values being
    
written coinciding with the earlier values.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] libavcodec/wmaprodec.c

  • avcodec/jpeg2000dec : Make decoder init-threadsafe

    7 mai 2021, par Andreas Rheinhardt
    avcodec/jpeg2000dec : Make decoder init-threadsafe

    The JPEG-2000 decoder and encoder share common luts ; the decoder
    
initializes them once, guarded by a dedicated AVOnce, whereas
    
the encoder initializes them always during init. This means that
    
the decoder is not init-threadsafe ; in fact there is a potential
    
data race because these luts can be initialized while an active
    
decoder/encoder is using them.
    

    Fix this and make the decoder init-threadsafe by making the
    
initialization function guard initialization itself with a dedicated
    
AVOnce.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] libavcodec/jpeg2000.c
    • [DH] libavcodec/jpeg2000dec.c

  • avcodec/mqc : Hardcode tables to save space

    7 mai 2021, par Andreas Rheinhardt
    avcodec/mqc : Hardcode tables to save space

    mqc currently initializes three arrays at runtime ; each of them
    
has 2 * 47 elements, one is uint16_t, two are uint8_t, so that their
    
combined size is 8 * 47. The source data for these initializations
    
is contained in an array of 47 elements of size six. Said array is
    
only used in order to initialize the other arrays, so the savings
    
are just 2 * 47B. Yet this is dwarfed by the size of the code for
    
performing the initializations : It is 109B (GCC 10.2, x64, -O3 albeit
    
in an av_cold function) ; this does not even include the size of the
    
code in the callers. So just hardcode these tables.
    

    This also fixes a data race, because the encoder always initialized
    
these tables during init, although they might already be used at the
    
same time by already running encoder/decoder instances.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] libavcodec/j2kenc.c
    • [DH] libavcodec/jpeg2000dec.c
    • [DH] libavcodec/mqc.c
    • [DH] libavcodec/mqc.h

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