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