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README.md	0 ## WALT Latency Timer ## 5 * [Post about WALT on Android Developers Blog](http://android-developers.blogspot.ca/2016/04/a-new-method-to-measure-touch-and-audio.html) 6 * [Instructional videos showing how to use WALT](https://www.youtube.com/playlist?list=PLd6Fi7WgXfcCEJg1FDqNCoQfpWo7W3J5a) 8 * Mailing list - [walt-discuss](https://groups.google.com/forum/#!forum/walt-discuss) 9 * Low-traffic mailing list for major announcements [walt-announce](https://groups.google.com/forum/#!forum/walt-announce) 11 WALT is designed to measure the latency of physical sensors and outputs on phones and computers. It can currently perform the following measurements: 21 The WALT app for Android can be 22 [installed from Google Play](https://play.google.com/store/apps/details?id=org.kamrik.latency.walt)     [all...]
/external/walt/docs/
ChromeOS.md	1 ## Using WALT on ChromeOS 3 WALT can be used on ChromeOS in two different modes: 4 1. Via the [pywalt/walt.py](/pywalt/walt.py) command line script - for this mode refer to [pywalt/README.md](/pywalt/README.md) 5 1. Using the [WALT Android app](https://play.google.com/store/apps/details?id=org.kamrik.latency.walt) and walt.py script as a bridge 11 Copy the [pywalt/](/pywalt) directory from WALT repo to the Chromebook. One option is to download a repo tarball directly from GitHub: 14 wget https://github.com/google/walt/archive/master.tar.gz 16 cd walt-master/pywal     [all...]
ScreenLatency.md	3 WALT can detect when screen changes color between white and black using a photodiode. 5  9 WALT Android app uses View.setBackgroundColor to change the color and reports the time from the beginning of the next frame rendering until the screen changes physically. 13 Example of screen brightness as a function of time during transition from black to white (blue line) and from white to black (green line) on Nexus 5X. The horizontal lines show the thresholds used by WALT for timing the transition (see #80). 29 All measurements below were taken with the device set to max brightness and WALT positioned in the middle of the screen.
AudioLatency.md	3 Audio output latency as measured by WALT is the time that passes from the moment an application 22 WALT app follows this pattern. 25 [player callback](https://github.com/google/walt/blob/v0.1.6/android/WALT/app/src/main/jni/player.c#L107) 26 and the latency reported by WALT app is the time from the 27 [Enqueue() call](https://github.com/google/walt/blob/v0.1.6/android/WALT/app/src/main/jni/player.c#L123) 28 until there is a detectable signal on the wire. Note that this does not include the time between the moment the app decided to output a tone until the Enqueue() call. This is somewhat counterintuitive but this time is deliberately omitted. In case of the WALT app code this time is likely be uniformly distributed between 0 and the length of the buffer (5 ms in case of Nexus 5) and therefore would contribute considerable variance but little interesting information if included in the reported latency. 32 [recorder callback](https://github.com/google/walt/blob/v0.1.6/android/WALT/app/src/main/jni/player.c#L345     [all...]
PrivacyPolicy.md	0 ## WALT Android App Privacy Policy 6 WALT app processes all data locally on the Android device and does not transmit any information via the Internet, 12 WALT app needs the Internet permission on ChromeOS devices where USB is not available to Android apps
Development.md	1 ## Setting up for WALT Android app development 3 In general WALT Android app has no special requirements but since WALT usually takes up the only available USB connector on the phone, the typical development using ADB via USB becomes difficult. Below are some options to overcome this problem. 14 1. Use the hub to connect WALT, Ethernet adapter and whatever other USB peripherals you might want to test using WALT 23 Since Android on ChromeOS has no access to USB, it requires a TCP bridge script implemented in [walt.py](/pywalt/walt.py). Detailed instructions in [Chromeos.md](Chromeos.md). 41 1. Run the WALT TCP bridge (more details [here](ChromeOS.md)) 44 1. `python walt.py -t bridge`
DragLatency.md	5 For drag (or scroll) latency WALT uses a laser that shines across the touch device and hits a detector on the 35 The WALT app finds a shift _S_ such that the standard deviation of _y_( _t<sub>i</sub>_ + _S_) is minimal - that is the 'x' marks are as close as possible to a horizontal straight line on the graph below. The reported number is the average of the two time shifts calculated separately for the upper and the lower lines (corresponding to two sides of the finger).
TapLatency.md	6 WALT uses a ?stylus? equipped with an accelerometer. The finger is imitated by a flat metal

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