WIP: add a script to manually run tc3

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

scripts/test-case-3-run.sh

+
+# start music player
+killall pw-loopback
+
+pw-link -iol
+
+## Input 1 to LEFT side
+pw-loopback -m '[FL FR]' \
+    --capture-props='media.class=Audio/Sink node.name=input_1' \
+    --playback-props='node.name=input_1' &
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_10.png
+
+pw-link alsa_input.usb-0d8c_USB_Sound_Device-00.analog-stereo input_1
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_11.png
+
+# Merge R in L
+pw-link input_1:output_FR alsa_output.usb-0d8c_USB_Sound_Device-00.analog-stereo:playback_FL
+# Drop R
+pw-link -d input_1:output_FR alsa_output.usb-0d8c_USB_Sound_Device-00.analog-stereo:playback_FR
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_12.png
+
+
+## Input 2 to RIGHT side
+pw-loopback -m '[FL FR]' \
+    --capture-props='media.class=Audio/Sink node.name=input_2' \
+    --playback-props='node.name=input_2' &
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_20.png
+
+pw-link alsa_input.platform-sound.stereo-fallback input_2
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_21.png
+
+# Merge L in R
+pw-link input_2:output_FL alsa_output.usb-0d8c_USB_Sound_Device-00.analog-stereo:playback_FR
+# Drop L
+pw-link -d input_2:output_FL alsa_output.usb-0d8c_USB_Sound_Device-00.analog-stereo:playback_FL
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_22.png
+
+
+# Sink to the other dvice
+pw-link input_1:output_FL alsa_output.platform-sound.stereo-fallback:playback_FL
+pw-link input_1:output_FR alsa_output.platform-sound.stereo-fallback:playback_FL
+pw-link input_2:output_FL alsa_output.platform-sound.stereo-fallback:playback_FR
+pw-link input_2:output_FR alsa_output.platform-sound.stereo-fallback:playback_FR
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_23.png
+
+# Graph is installed. Time to stop capture and recapture in loop
+pw-link -d alsa_input.usb-0d8c_USB_Sound_Device-00.analog-stereo input_1
+pw-link alsa_input.usb-0d8c_USB_Sound_Device-00.analog-stereo input_1
+
+pw-link -d alsa_input.platform-sound.stereo-fallback input_2
+pw-link alsa_input.platform-sound.stereo-fallback input_2
+
+pw-dot -o pw-test.dot && dot -Tpng pw-test.dot > pw-test_30.png
+