From a3a6c7257766495751e9f0b1239a7a31acb227e1 Mon Sep 17 00:00:00 2001
From: Paul Kaplan <pkaplan@media.mit.edu>
Date: Wed, 9 Aug 2017 13:35:00 -0400
Subject: [PATCH] Adjust sound effects to playtest levels
---
src/lib/audio/audio-effects.js | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/src/lib/audio/audio-effects.js b/src/lib/audio/audio-effects.js
index 683568b69..b7ba65cb2 100644
--- a/src/lib/audio/audio-effects.js
+++ b/src/lib/audio/audio-effects.js
@@ -19,6 +19,7 @@ class AudioEffects {
constructor (buffer, name) {
// Some effects will modify the playback rate and/or number of samples.
// Need to precompute those values to create the offline audio context.
+ const pitchRatio = Math.pow(2, 4 / 12); // A major third
let sampleCount = buffer.length;
let playbackRate = 1;
switch (name) {
@@ -26,11 +27,11 @@ class AudioEffects {
sampleCount = buffer.length + 0.25 * 3 * buffer.sampleRate;
break;
case effectTypes.FASTER:
- playbackRate = 1.5;
+ playbackRate = pitchRatio;
sampleCount = Math.floor(buffer.length / playbackRate);
break;
case effectTypes.SLOWER:
- playbackRate = 0.5;
+ playbackRate = 1 / pitchRatio;
sampleCount = Math.floor(buffer.length / playbackRate);
break;
case effectTypes.REVERSE:
@@ -51,10 +52,10 @@ class AudioEffects {
let output;
switch (this.name) {
case effectTypes.LOUDER:
- ({input, output} = new VolumeEffect(this.audioContext, 1.5));
+ ({input, output} = new VolumeEffect(this.audioContext, 1.25));
break;
case effectTypes.SOFTER:
- ({input, output} = new VolumeEffect(this.audioContext, 0.5));
+ ({input, output} = new VolumeEffect(this.audioContext, 0.75));
break;
case effectTypes.ECHO:
({input, output} = new EchoEffect(this.audioContext, 0.25));
--
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