Anton Khirnov 350d06d63f lavc: add avcodec_is_open(). ...

It allows to check whether an AVCodecContext is open in a documented
way. Right now the undocumented way this check is done in lavf/lavc is
by checking whether AVCodecContext.codec is NULL. However it's desirable
to be able to set AVCodecContext.codec before avcodec_open2().

(cherry picked from commit af08d9aeea)

Conflicts:

	doc/APIchanges

2012-02-26 09:03:33 +01:00

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