Hey yes 1900 series routers support qos , it should support all functions for it.
You could to go to your release page for your software to find exactly what commads are supported but 19s should support everything a 28 or 38/39 do in qos anyway
As example heres the command guide page for 15.4 and its page for qos , you should be able to use these as well as guide
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos/config_library/15-mt/qos-15-mt-library.html
http://www.cisco.com/c/en/us/support/ios-nx-os-software/ios-15-4m-t/products-installation-and-configuration-guides-list.html
