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README.md

      1 The AudioLoopbackTest is used to test round-trip audio performance over headset jack and USB.
      2 It 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