Packages with the aptx use flag

media-sound / bluez-alsa : Bluetooth Audio ALSA Backend

  • aptX (HD) over Bluetooth (many Android compatible headphones)

media-sound / pulseaudio-daemon : Daemon component of PulseAudio (networked sound server)

  • aptX (HD) over Bluetooth (many Android compatible headphones), requires media-plugins/gst-plugins-openaptx.