Implemented naive tracking of PIDs to close mpv+alsaloop

bin/capturecard

@@ -16,21 +16,24 @@
 # - Lots of searching through ancient fragments of the 'net
 #
 # TODO:
-# - Capture and retry to connect audio
+# - Capture the exact PIDs of the launched mpv / alsaloop to prevent 
+#   shutting down any other loops / mpv that happen to be open
 
 # Set our device to 1080p otherwise it defaults to 480p
 v4l2-ctl --set-fmt-video=width=1920,height=1080
 
 # Connect to capture card and display captured images immediately
 # Send to background so we can initiate the loop below
-mpv av://v4l2:/dev/video0 --profile=low-latency --untimed &
-
-# audio can't connect until video is established due to a constant
-# powercycle when inactive, likely due to lack of proper driver
-sleep 3
+mpv --title="Capture Card"  av://v4l2:/dev/video0 --profile=low-latency --untimed &
 
 # Run a loop for the capture card digital audio to be sent to my desktop audio
-alsaloop -C hw:2,0 -P hw:1,0
+alsaloop -C hw:2,0 -P hw:1,0 &
 
-# Let's exit this shit when done
+# Watch for mpv to exit
+while pgrep -f mpv >/dev/null; do
+	continue
+done
+
+# Kill the alsaloop when mpv exits, then terminate this script
+kill -9 $(pgrep -f alsaloop)
 exit