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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().
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- doc/APIchanges 3 additions, 0 deletionsdoc/APIchanges
- libavcodec/avcodec.h 6 additions, 0 deletionslibavcodec/avcodec.h
- libavcodec/options.c 1 addition, 1 deletionlibavcodec/options.c
- libavcodec/utils.c 8 additions, 0 deletionslibavcodec/utils.c
- libavformat/utils.c 2 additions, 3 deletionslibavformat/utils.c
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