Simply playing these back out of the Raspberry Pi’s audio out and into the switch’s IR input through a tiny transistor circuit does the trick. Now they have a networked five-way HDMI switch ...

Designed for infrared (IR) remote control ... preamplifier circuits, now housed in a compact 2 mm by 2 mm by 0.76 mm QFN package, offer a broader supply voltage range of 2.0 V to 5.5 V, 37% ...