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    Unfortunately a software is never perfect.
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  • lavu/hwcontext_vaapi : fix a race mapping to allow CSC to YUV420P

    7 août, par nyanmisaka
    lavu/hwcontext_vaapi : fix a race mapping to allow CSC to YUV420P

    There's a race condition for YUV420P when mapping from pix_fmt
    
to VA fourcc, both I420 and YV12 could be found by pix_fmt.
    

    Currently, vaapi_get_image_format() iterates over the query results
    
of pix_fmt and returns the first matching result in the order
    
declared in the driver. This may result in an incorrect image_format.
    

    Now use fourcc to find the image_format.
    

    Fixes :
    
ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -i INPUT \

    - vf scale_vaapi=format=yuv420p,hwmap,format=yuv420p \

    - vframes 1 -f rawvideo -y yuv420p.yuv
    

    Signed-off-by : nyanmisaka <nst799610810@gmail.com>
    • [DH] libavutil/hwcontext_vaapi.c

  • avcodec/mpeg4videoenc : Fix data race when using AC prediction

    14 juin, par Andreas Rheinhardt
    avcodec/mpeg4videoenc : Fix data race when using AC prediction

    The check for whether we can use the fast path to process
    
AC coefficients used the qscale value belonging to a different
    
slice ; this worked in practice, because the predicted AC values
    
are zero in this case, so it does not matter whether we use
    
the fast or the slow path.
    

    Fix this by checking for first_slice_line instead. This fixes all
    
the races in the encoding part of the vsynth*-mpeg4-thread tests
    
(and fixes them if no frame threading is in use for the decoding part).
    

    (The left prediction check may use data from a different slice, too,
    
but said slice is always processed by the same thread, so that no race
    
can happen. Given that out-of-slice AC values are zero, it does not
    
matter whether we use the fast path or the slow path either.)
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] libavcodec/mpeg4videoenc.c

  • fftools/resources/resman : Don't alloc ResourceManager, fix race

    1er juin, par Andreas Rheinhardt
    fftools/resources/resman : Don't alloc ResourceManager, fix race

    The resman_ctx pointer was accessed outside of its guarding
    
mutex.
    

    Also make the ResourceManager static.
    

    Reviewed-by : softworkz . <softworkz-at-hotmail.com@ffmpeg.org>
    
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] fftools/resources/resman.c

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