You will need an HDMI input selector with audio extraction. The PS4 and any other sources connect to it with HDMI. The HDMI output goes to an HDMI input on the TV. The analog audio output of the switcher goes to your HTS.
You will need an HDMI input selector with audio extraction. The PS4 and any other sources connect to it with HDMI. The HDMI output goes to an HDMI input on the TV. The analog audio output of the switcher goes to your HTS.