1The AudioLoopbackTest is used to test round-trip audio performance over headset jack and USB. 2It is based on the Loopback.apk run with Loopback dongle: https://source.android.com/devices/audio/loopback 3 4* How to run the test? 5 1. plug in the Loopback dongle to your device. 6 2. `make vts` 7 3. `vts-tradefed run vts -m AudioLoopbackTest` 8 9* What metrics this test report? 10 1. Average round-trip latency. 11 2. Standard deviation of round-trip latency. 12 13* Which version of Loopback.apk is used in the test? 14 The Loopback.apk used in this test is Loopback-v17 copied from https://tradefed.teams.x20web.corp.google.com/testdata/media/apps/ 15 16* Where can I get the source code for the Loopback.apk? 17 Internal developer: https://googleplex-android.git.corp.google.com/platform/vendor/google_toolbox/+/master/user/rago/studio/LoopbackApp/ 18 Open source: https://github.com/gkasten/drrickorang