v3 audio

docs/audio.md

@@ -0,0 +1,43 @@
+# PiKVM V3 Audio
+
+This feature allows you to receive audio over an HDMI cable and transmit it to the browser in WebRTC mode.
+
+!!! warning
+    * This is only supported by PiKVM V3 devices right now.
+    * Please not the feature is experimental. Nothing will explode for you, but something may not work. Please report about problems [here](https://discord.gg/bpmXfz5) (preferred) or [here](https://github.com/pikvm/pikvm/issues/97).
+
+## Preparing
+1. Make sure that you have not removed the [jumpers related to audio (4)](v3.md#atx-connection) on the V3 board and have not deleted or commented out the `dtoverlay=tc358743-audio` line in `/boot/config.txt`. Return everything as it was, if you changed it.
+
+2. Update the OS:
+   ```
+   # rw
+   # pacman -Syu
+   ```
+
+3. Edit `/etc/kvmd/janus/janus.plugin.ustreamer.jcfg` and add the following lines at the end:
+   ```
+   audio: {
+       device = "hw:0,0"
+       tc358743 = "/dev/kvmd-video"
+   }
+   ```
+
+4. Enable the basic audio in the EDID:
+   ```
+   # kvmd-edidconf --set-audio=yes
+   ```
+
+5. Reboot the device:
+   ```
+   # reboot
+   ```
+
+6. Your host will detect the possibility of audio output via HDMI. Mac OS usually connects automatically, Windows requires manual indication, Linux will require a ritual shamanic dance. In any case, make sure that the audio is output via HDMI on your host.
+
+7. Open the PiKVM Web UI. Click the **System** menu and switch the video mode to **H.264 / WebRTC**. After that, the volume slider will appear under the switch. Increase it to the maximum and have fun.
+
+!!! warning
+    * After the page is reloaded, the audio slider will be reset. This is a technical limitation in all browsers to avoid annoying audio ads.
+    * If something doesn't work, check the log: `journalctl -u kvmd-janus`.
+    * Please report about problems [here](https://discord.gg/bpmXfz5) (preferred) or [here](https://github.com/pikvm/pikvm/issues/97).

docs/v3.md

@@ -90,6 +90,8 @@ If you have a kit without a metal case, you can use our free 3D printing case dr
 9. !!! warning "IO ports and other things"
     **Before using GPIO** pins to control a relay, KVM switch, or anything else, be sure to [check the HAT pinout](#io-ports-and-jumpers). Many ports are busy with internal functions. Before using them for your own use, you must disable them, otherwise you may damage the device.
 
+10. **You can also try the experimental [audio forwarding](audio.md){target=_blank}**.
+
 
 ## ATX connection