walt

I'm the author. My testing methodology was to run the round-trip latency test using OboeTester: https://github.com/google/oboe/tree/master/apps/OboeTester/d.... It's a simple test: produce a tone (either on built-in speaker or over wired headphones if using a loopback dongle), measure the time it takes for that tone to reach the audio input. For devices which I didn't have access to (our team has a limited number of test devices) I used the figures from Superpowered, but with some assumptions/rules: #1 If AAudio was available on the device I used the measurements from that rather than OpenSL ES #2 No measurements from custom ROMs #3 I used the measurements from the latest version of Android which the OEM had released for that device. For example, if a device was originally released with Lollipop but it was possible to upgrade to Marshmal

Hmm, are you inspired or were part of https://github.com/google/walt ?

It's for drag latency: https://github.com/google/walt/blob/master/docs/DragLatency.... It may be counter intuitive, but touch-down latency and drag latency can be very different: on some hardware one may be faster or slower than the other. That's why both are measured. Note: I worked with Mark to review most of his work on this project.