open sourced

Brewfile

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+brew "overmind"
+brew "sox"
+cask "blackhole-16ch"

Brewfile.lock.json

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+{
+  "entries": {
+    "brew": {
+      "overmind": {
+        "version": "2.2.2",
+        "bottle": {
+          "rebuild": 0,
+          "root_url": "https://ghcr.io/v2/homebrew/core",
+          "files": {
+            "arm64_big_sur": {
+              "cellar": ":any_skip_relocation",
+              "url": "https://ghcr.io/v2/homebrew/core/overmind/blobs/sha256:00af66eeee076ae3bccba58a690dc73f908b6af7ea0bfebf1fc6b81c5a88c445",
+              "sha256": "00af66eeee076ae3bccba58a690dc73f908b6af7ea0bfebf1fc6b81c5a88c445"
+            },
+            "big_sur": {
+              "cellar": ":any_skip_relocation",
+              "url": "https://ghcr.io/v2/homebrew/core/overmind/blobs/sha256:f0a2458bfe0cbe0a38ca8579b774e45262f68bf8a9f9d1d2ff70a9c388c21446",
+              "sha256": "f0a2458bfe0cbe0a38ca8579b774e45262f68bf8a9f9d1d2ff70a9c388c21446"
+            },
+            "catalina": {
+              "cellar": ":any_skip_relocation",
+              "url": "https://ghcr.io/v2/homebrew/core/overmind/blobs/sha256:0d2b7a68b08aa6ce0a5cdfad5a90166248ee11fce70970d1e820918de612168a",
+              "sha256": "0d2b7a68b08aa6ce0a5cdfad5a90166248ee11fce70970d1e820918de612168a"
+            },
+            "mojave": {
+              "cellar": ":any_skip_relocation",
+              "url": "https://ghcr.io/v2/homebrew/core/overmind/blobs/sha256:07036145d0ff5102e0a64607cb1d253a49e66aa6ceb5ea4b82780a4078910c04",
+              "sha256": "07036145d0ff5102e0a64607cb1d253a49e66aa6ceb5ea4b82780a4078910c04"
+            },
+            "x86_64_linux": {
+              "cellar": ":any_skip_relocation",
+              "url": "https://ghcr.io/v2/homebrew/core/overmind/blobs/sha256:4c63f041aaf3949b972351ea2102a5405dc71d6c5e0de79cceb170745cf39d0a",
+              "sha256": "4c63f041aaf3949b972351ea2102a5405dc71d6c5e0de79cceb170745cf39d0a"
+            }
+          }
+        }
+      },
+      "sox": {
+        "version": "14.4.2_3",
+        "bottle": {
+          "rebuild": 0,
+          "root_url": "https://ghcr.io/v2/homebrew/core",
+          "files": {
+            "arm64_big_sur": {
+              "cellar": ":any",
+              "url": "https://ghcr.io/v2/homebrew/core/sox/blobs/sha256:8070949420a9a02f3d5e1a99bd460d064e34c361798bae5c4554ac8e1aeb2d49",
+              "sha256": "8070949420a9a02f3d5e1a99bd460d064e34c361798bae5c4554ac8e1aeb2d49"
+            },
+            "big_sur": {
+              "cellar": ":any",
+              "url": "https://ghcr.io/v2/homebrew/core/sox/blobs/sha256:e3f62a35b06c9e79516f575a923b3aafc5357f370f4ae5c2812c67c8862ae11c",
+              "sha256": "e3f62a35b06c9e79516f575a923b3aafc5357f370f4ae5c2812c67c8862ae11c"
+            },
+            "catalina": {
+              "cellar": ":any",
+              "url": "https://ghcr.io/v2/homebrew/core/sox/blobs/sha256:fc412be07e577c2161763dfb509f4fb43f4fe3bca206a1b0b370687df0a264fa",
+              "sha256": "fc412be07e577c2161763dfb509f4fb43f4fe3bca206a1b0b370687df0a264fa"
+            },
+            "mojave": {
+              "cellar": ":any",
+              "url": "https://ghcr.io/v2/homebrew/core/sox/blobs/sha256:4906207f83bd0f4ea1a67d040891711e9a9e8830216e451072f2957ca566b83d",
+              "sha256": "4906207f83bd0f4ea1a67d040891711e9a9e8830216e451072f2957ca566b83d"
+            },
+            "high_sierra": {
+              "cellar": ":any",
+              "url": "https://ghcr.io/v2/homebrew/core/sox/blobs/sha256:c0bb4ba7ec922d9a8c71c2ba84e28c66c67e4fdeae970011ea45e937f43c18bd",
+              "sha256": "c0bb4ba7ec922d9a8c71c2ba84e28c66c67e4fdeae970011ea45e937f43c18bd"
+            },
+            "sierra": {
+              "cellar": ":any",
+              "url": "https://ghcr.io/v2/homebrew/core/sox/blobs/sha256:dc8c294bb96c0b7ebc3ade73476c6031664bb8e81a32ece87ce84f815deeced5",
+              "sha256": "dc8c294bb96c0b7ebc3ade73476c6031664bb8e81a32ece87ce84f815deeced5"
+            },
+            "x86_64_linux": {
+              "cellar": ":any_skip_relocation",
+              "url": "https://ghcr.io/v2/homebrew/core/sox/blobs/sha256:812ddfd499335d3ff3e096b6153ef60e86326b5fb2cffb3e2ae02e8be6bc98c2",
+              "sha256": "812ddfd499335d3ff3e096b6153ef60e86326b5fb2cffb3e2ae02e8be6bc98c2"
+            }
+          }
+        }
+      }
+    },
+    "cask": {
+      "blackhole-16ch": {
+        "version": "0.2.10",
+        "options": {
+          "full_name": "blackhole-16ch"
+        }
+      }
+    }
+  },
+  "system": {
+    "macos": {
+      "big_sur": {
+        "HOMEBREW_VERSION": "3.2.17-63-g5a5a8d5",
+        "HOMEBREW_PREFIX": "/opt/homebrew",
+        "Homebrew/homebrew-core": "df940f25efdeaec9913a76c9119e6cb44b7632cf",
+        "CLT": "12.5.0.22.9",
+        "Xcode": "13.0",
+        "macOS": "11.6"
+      }
+    }
+  }
+}

Procfile

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+host: sleep 3; sox -V1 -t coreaudio "BlackHole 16ch" -t wav -b 16 - remix 1 2 | nc 192.168.44.4 2150 | sox --input-buffer 500000 -V1 -t wav - -t coreaudio "BlackHole 16ch" remix 0 0 1 2
+pi: trap 'ssh -S none root@pi "killall nc arecord aplay"' EXIT > /dev/null; ssh -S none root@pi 'nice -n -20 arecord --disable-resample --disable-channels --disable-format --disable-softvol --format S24_3LE --rate 44100 --channels 2 --file-type wav - | nice -n -20 nc -l 2150 -I 3000000 -O 3000000 | nice -n -20 aplay --disable-resample --disable-channels --disable-format --disable-softvol -'
+
+# fixme: why sshd suddenly exits?
+#ipad: trap 'ssh ipad "killall cat socat"' EXIT > /dev/null; ssh ipad ./pi-socat.sh

README.md

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+This code allows to use Raspberry Pi Zero as a USB gadget
+composite of Ethernet and Audio input/output.
+
+Alternatives:
+
+* [Dante AVIO Adapter](https://www.audinate.com/products/devices/dante-avio#USB) – seems cool and pricey
+* Zoom H2N recorder – wired input only, analog line
+* Apple IDAM – wired output only, lossless
+* [Audreio](https://audre.io/) – seems outdated without Audiobus integration
+
+Credits:
+* [iSticktoit.net - Composite USB gadgets on the Raspberry Pi Zero](https://www.isticktoit.net/?p=1383)
+
+Raspberry Pi bootstrap on macOS:
+```shell
+# export $SDCARD=diskX
+# diskutil unmountDisk /dev/$SDCARD
+# sudo dd bs=1m if=~/Downloads/2021-05-07-raspios-buster-armhf-lite.img of=/dev/r$SDCARD; sync
+# sudo diskutil eject /dev/r$SDCARD
+
+# config.txt – add new line to the bottom: dtoverlay=dwc2
+# cmdline.txt – insert after rootwait: modules-load=dwc2,g_ether
+# create empty file: touch ssh
+
+# on raspberry A+, maybe: dtoverlay=dwc2,dr_mode=peripheral
+# https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README#L800
+
+# to disable LED add to /boot/config.txt
+dtparam=act_led_trigger=none
+dtparam=act_led_activelow=on
+
+# to disable wireless add to /boot/config.txt
+dtoverlay=disable-wifi
+dtoverlay=disable-bt
+
+ping raspberrypi.local
+ssh pi@169.254.X.Y
+pass: raspberry
+
+# after deploy.sh change cmdline.txt: modules-load=dwc2,libcomposite
+```

deploy.sh

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+#!/bin/zsh
+
+scp rc.local root@pi:/etc/rc.local
+scp usb.sh root@pi:/root/usb.sh

duplex-ipad/pi-socat.sh → iSH-socat.sh

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 #!/bin/sh
-# run via iSH on iPad:
-cat /dev/location > /dev/null & # allows to run in background
+# run via https://ish.app
+cat /dev/location > /dev/null & # granting "allow always" enables running in background
 socat TCP-LISTEN:2122,bind=0.0.0.0,fork,su=nobody,reuseaddr TCP:169.254.1.1:22 &
-socat TCP-LISTEN:2150,bind=0.0.0.0,fork,su=nobody,reuseaddr TCP:169.254.1.1:2150 &
+socat TCP-LISTEN:2150,bind=0.0.0.0,fork,su=nobody,reuseaddr TCP:169.254.1.1:2150

rc.local

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+#!/bin/sh -e
+#
+# rc.local
+#
+# This script is executed at the end of each multiuser runlevel.
+# Make sure that the script will "exit 0" on success or any other
+# value on error.
+#
+# In order to enable or disable this script just change the execution
+# bits.
+#
+# By default this script does nothing.
+
+/root/usb.sh || echo "cannot setup usb?"
+
+tvservice -o || echo "cannot disable hdmi?"
+
+exit 0

usb.sh

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+#!/usr/bin/bash
+
+cd /sys/kernel/config/usb_gadget/ || fail
+mkdir -p lexi && cd lexi || fail
+
+echo 0x1d6b > idVendor # Linux Foundation
+echo 0x0104 > idProduct # Multifunction Composite Gadget
+echo 0x0100 > bcdDevice # v1.0.0
+echo 0x0200 > bcdUSB # USB2
+mkdir -p strings/0x409
+echo "fedcba9876543210" > strings/0x409/serialnumber
+echo "Lexi" > strings/0x409/manufacturer
+echo "Raspberry Pi Zero" > strings/0x409/product
+mkdir -p configs/c.1/strings/0x409
+echo "ECM + UAC2" > configs/c.1/strings/0x409/configuration
+echo 250 > configs/c.1/MaxPower
+
+# Ethernet
+mkdir -p functions/ecm.usb0
+# first byte of address must be even
+echo "48:6f:73:74:50:43" > functions/ecm.usb0/host_addr
+echo "42:61:64:55:53:42" > functions/ecm.usb0/dev_addr
+ln -s functions/ecm.usb0 configs/c.1/
+
+# UAC2 audio
+mkdir -p functions/uac2.usb0
+echo 3 > functions/uac2.usb0/c_ssize
+echo 2 > functions/uac2.usb0/p_ssize
+echo 44100 > functions/uac2.usb0/c_srate
+echo 44100 > functions/uac2.usb0/p_srate
+ln -s functions/uac2.usb0 configs/c.1/
+
+# End functions
+ls /sys/class/udc > UDC
+
+ifconfig usb0 169.254.1.1 netmask 255.255.0.0 up
+route add -net default gw 169.254.1.2