You need a wireless Ethernet bridge.
[wireless router]<-- wireless -->[wireless ethernet bridge]<-- wire -->[blu-ray player, tv, etc.]ZyXEL WAP3205 Wireless N Access Point / Ethernet Bridge
That's just an example. There are many makes and models, even some routers that can be configured as a wireless Ethernet bridge using either w/ their own firmware, or third party firmware (e.g., dd-wrt