Andreas Rheinhardt 3c26773ae2 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>

2021-05-12 06:00:14 +02:00

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