fix(@scripts): 🐛 update audio input to use configurable device

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

bin/rvoice

@@ -28,6 +28,10 @@
 #   RVOICE_AUTOSEND=1                         (append Enter; default 0)
 #   RVOICE_MIN_MS=200                         (ignore taps shorter than this)
 #   RVOICE_MAX_S=60                           (hard cap on recording length)
+#   RVOICE_AUDIO_INPUT=":default"             (avfoundation input; numeric
+#                                              index or "default". List devices
+#                                              with: ffmpeg -f avfoundation
+#                                              -list_devices true -i "")
 #
 # State lives in $TMPDIR/rvoice/ — one recording at a time.
 
@@ -42,6 +46,10 @@ LANG_HINT=${RVOICE_LANG:-en}
 AUTOSEND=${RVOICE_AUTOSEND:-0}
 MIN_MS=${RVOICE_MIN_MS:-200}
 MAX_S=${RVOICE_MAX_S:-60}
+# avfoundation input spec. ":default" → macOS system default input
+# (controlled via Sound Settings / Control Center → Sound). Numeric ":N"
+# pins to a specific device index from `ffmpeg -f avfoundation -list_devices`.
+AUDIO_INPUT=${RVOICE_AUDIO_INPUT:-:default}
 
 STATE_DIR=${TMPDIR:-/tmp}/rvoice
 mkdir -p "$STATE_DIR"
@@ -111,10 +119,11 @@ cmd_start() {
     _start_ts=$(now_ms)
     printf '%s' "$_start_ts" > "${START_FILE}.tmp"
     mv -f "${START_FILE}.tmp" "$START_FILE"
-    # 16kHz mono PCM, capped at MAX_S. Device "0" is the default macOS input;
-    # change with AVFoundation list if you have multiple mics.
+    # 16kHz mono PCM, capped at MAX_S. AUDIO_INPUT defaults to ":default"
+    # which honors the macOS system default input (configurable via Sound
+    # Settings / Control Center). Numeric ":N" pins a specific device.
     nohup ffmpeg -hide_banner -loglevel error -nostdin \
-        -f avfoundation -i ":0" \
+        -f avfoundation -i "$AUDIO_INPUT" \
         -ac 1 -ar 16000 -t "$MAX_S" \
         -y "$WAV_FILE" >/dev/null 2>>"$LOG_FILE" &
     echo $! > "$PID_FILE"