nix-configs

commit 29fed78d219fb2ac8274171dd9dcd5e157237e33
parent 3662fc304853348adb8583ac81c98392300e8bf3
Author: breadcat <breadcat@users.noreply.github.com>
Date:   Fri, 17 Jul 2026 10:26:03 +0100

Initial PBX audio script

Diffstat:
M
machines/ilias.nix
 | 
1
+
A
scripts/pbx.nix
 | 
119
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 120 insertions(+), 0 deletions(-)
diff --git a/machines/ilias.nix b/machines/ilias.nix
@@ -39,6 +39,7 @@
     ../scripts/duupmove.nix
     ../scripts/overtid.nix
     ../scripts/payslips.nix
+    ../scripts/pbx.nix
     ../scripts/phone-dump.nix
     ../scripts/restic.nix
     ../scripts/seedy.nix
diff --git a/scripts/pbx.nix b/scripts/pbx.nix
@@ -0,0 +1,119 @@
+{pkgs, ...}:
+
+let
+  pbx = pkgs.writeShellScriptBin "pbx" ''
+
+set -euo pipefail
+
+usage() {
+cat <<EOF
+Usage:
+  $0 <model> <input> [output] [--volume N]
+
+Examples:
+  $0 samsung greeting.mp3
+  $0 samsung greeting.mp3 output.wav
+  $0 gamma prompt.flac --volume 0.8
+  $0 webex prompt.wav output.wav --volume 0.75
+EOF
+exit 1
+}
+
+VOLUME=""
+POSITIONAL=()
+
+while [[ $# -gt 0 ]]; do
+	case "$1" in
+		--volume)
+			[[ $# -ge 2 ]] || {
+				echo "--volume requires a value"
+				exit 1
+			}
+			VOLUME="$2"
+			shift 2
+			;;
+		-h|--help)
+			usage
+			;;
+		*)
+			POSITIONAL+=("$1")
+			shift
+			;;
+	esac
+done
+
+set -- "''${POSITIONAL[@]}"
+
+[[ $# -ge 2 && $# -le 3 ]] || usage
+
+MODEL=$(tr '[:upper:]' '[:lower:]' <<<"$1")
+INPUT="$2"
+
+if [[ $# -eq 3 ]]; then
+	OUTPUT="''${3%.*}.wav"
+else
+	OUTPUT="''${INPUT%.*}.wav"
+fi
+
+[[ -f "$INPUT" ]] || {
+	echo "Input file not found."
+	exit 1
+}
+
+COMMON_ARGS=(
+	-ar 8000
+	-ac 1
+)
+
+case "$MODEL" in
+	samsung|3cx|webex)
+		CODEC_ARGS=(-codec:a pcm_s16le -ab 128k)
+		;;
+	lg-emg|lg-ucp|panasonic|gamma)
+		CODEC_ARGS=(-codec:a pcm_mulaw -ab 64k)
+		;;
+	lg-hosted)
+		CODEC_ARGS=(-codec:a pcm_s16le -ab 64k)
+		;;
+	*)
+		echo "Unknown model '$MODEL'"
+		exit 1
+		;;
+esac
+
+FFMPEG_ARGS=()
+
+if [[ -n "$VOLUME" ]]; then
+	FFMPEG_ARGS+=(-af "volume=$VOLUME")
+fi
+
+# Avoid overwriting the input if converting an existing WAV.
+if [[ "$(realpath "$INPUT")" == "$(realpath -m "$OUTPUT")" ]]; then
+	BACKUP="''${INPUT%.wav}.original.wav"
+
+	if [[ -e "$BACKUP" ]]; then
+		i=1
+		while [[ -e "''${INPUT%.wav}.original.''${i}.wav" ]]; do
+			((i++))
+		done
+		BACKUP="''${INPUT%.wav}.original.''${i}.wav"
+	fi
+
+	mv "$INPUT" "$BACKUP"
+	INPUT="$BACKUP"
+
+	echo "Original renamed to $BACKUP"
+fi
+
+${pkgs.ffmpeg}/bin/ffmpeg -i "$INPUT" \
+	"''${CODEC_ARGS[@]}" \
+	"''${COMMON_ARGS[@]}" \
+	"''${FFMPEG_ARGS[@]}" \
+	"$OUTPUT"
+
+echo "Created $OUTPUT"
+
+  '';
+in {
+  environment.systemPackages = [pbx];
+}