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audio level calculation in tabletUI.js

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Faye Li 2017-01-03 09:27:33 -08:00
parent 67294217b8
commit 656ddfe287
1 changed files with 33 additions and 0 deletions
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33
scripts/system/tablet-ui/tabletUI.js
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@ -67,4 +67,37 @@
Script.update.connect(updateShowTablet);
// Script.setInterval(updateShowTablet, 1000);
// Initialise variables used to calculate audio level
var accumulatedLevel = 0.0;
// Note: Might have to tweak the following two based on the rate we're getting the data
var AVERAGING_RATIO = 0.05;
var AUDIO_LEVEL_UPDATE_INTERVAL_MS = 100;
// Calculate audio level with the same scaling equation (log scale, exponentially averaged) in AvatarInputs and pal.js
function getAudioLevel() {
var LOUDNESS_FLOOR = 11.0;
var LOUDNESS_SCALE = 2.8 / 5.0;
var LOG2 = Math.log(2.0);
var audioLevel = 0.0;
accumulatedLevel = AVERAGING_RATIO * accumulatedLevel + (1 - AVERAGING_RATIO) * (MyAvatar.audioLoudness);
// Convert to log base 2
var logLevel = Math.log(accumulatedLevel + 1) / LOG2;
if (logLevel <= LOUDNESS_FLOOR) {
audioLevel = logLevel / LOUDNESS_FLOOR * LOUDNESS_SCALE;
} else {
audioLevel = (logLevel - (LOUDNESS_FLOOR - 1.0)) * LOUDNESS_SCALE;
}
if (audioLevel > 1.0) {
audioLevel = 1.0;
}
return audioLevel;
}
Script.setInterval(function() {
var currentAudioLevel = getAudioLevel();
// TODO: send the audio level to QML
}, AUDIO_LEVEL_UPDATE_INTERVAL_MS);
}()); // END LOCAL_SCOPE