AV_IS_INPUT_DEVICE 1221 cmdutils.c         return AV_IS_INPUT_DEVICE(avclass->category) || AV_IS_OUTPUT_DEVICE(avclass->category);
AV_IS_INPUT_DEVICE 2081 cmdutils.c         if (!fmt || !fmt->priv_class  || !AV_IS_INPUT_DEVICE(fmt->priv_class->category))
AV_IS_INPUT_DEVICE   36 libavdevice/utils.c     if (!iformat || !iformat->priv_class || !AV_IS_INPUT_DEVICE(iformat->priv_class->category)) {