Andreas Rheinhardt 3c3712ee2b 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>

2021-05-10 22:12:02 +02:00

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