Lookit's jsPsych Video Extensions and Plugins

[okaycj]

Summary

To start, we're going to write up a trial recording extension.

Test Samples

Trial recording

const jsPsych = initJsPsych({
  extensions: [{ type: chsRecord.TrialRecordExtension }],
});

const init_camera = { type: jsPsychInitializeCamera };

const trial = {
  type: jsPsychHtmlButtonResponse,
  stimulus: `<div id="target" style="width:250px; height: 250px; background-color: #333; position: relative; margin: 2em auto;"> <div class="orbit" style="width:25px; height:25px; border-radius:25px;background-color: #f00; position: absolute; top:calc(50% - 12px); left:calc(50% - 12px);"></div> </div> <style> .orbit { transform: translateX(100px); animation: orbit 4s infinite; } @keyframes orbit { 0% { transform: rotate(0deg) translateX(100px); } 100% { transform: rotate(360deg) translateX(100px); } } </style>`,
  choices: ["Done"],
  prompt: "<p>Video is recording. Click done after a few seconds.</p>",
  extensions: [{ type: chsRecord.TrialRecordExtension }],
};

jsPsych.run([init_camera, trial, stop_rec]);

Session Recording

const jsPsych = initJsPsych();

const init_camera = { type: jsPsychInitializeCamera };

const init_microphone = { type: jsPsychInitializeMicrophone };

const hello_trial = {
  type: jsPsychHtmlKeyboardResponse,
  stimulus: "Hello world!",
};

const morning = {
  type: jsPsychHtmlKeyboardResponse,
  stimulus: "Good morning!",
};

const evening = {
  type: jsPsychHtmlKeyboardResponse,
  stimulus: "Good evening!",
};

const night = { type: jsPsychHtmlKeyboardResponse, stimulus: "Good night!" };

const start_rec = { type: chsRecord.StartRecordPlugin };

const stop_rec = { type: chsRecord.StopRecordPlugin };

jsPsych.run([
  init_camera,
  start_rec,
  hello_trial,
  morning,
  evening,
  night,
  stop_rec,
]);

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Latest commit: 81dd78d

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[becky-gilbert]

FYI I changed chsVideo to chsRecord in the code in the PR description.

[becky-gilbert]

LGTM! 🚀