From 7d6adf58645bc8a7956431dd6607e561cca67fff Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Mon, 20 Mar 2017 18:49:37 -0400
Subject: [PATCH 1/3] Add mic input for loudness block

---
 src/index.js | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/index.js b/src/index.js
index 047d83b..94049ae 100644
--- a/src/index.js
+++ b/src/index.js
@@ -53,6 +53,10 @@ function AudioEngine () {
 
     // a map of md5s to audio buffers, holding sounds for all sprites
     this.audioBuffers = {};
+
+    // microphone, for measuring loudness, with a level meter analyzer
+    this.mic = null;
+    this.micMeter = null;
 }
 
 /**
@@ -143,6 +147,25 @@ AudioEngine.prototype.changeTempo = function (value) {
     this.setTempo(this.currentTempo  + value);
 };
 
+/**
+ * Get the current loudness of sound received by the microphone.
+ * Sound is measured in RMS and smoothed.
+ * @return {number} loudness scaled 0 to 100
+ */
+AudioEngine.prototype.getLoudness = function () {
+    if (!this.mic) {
+        this.mic = new Tone.UserMedia();
+        this.micMeter = new Tone.Meter('level', 0.5);
+        this.mic.open();
+        this.mic.connect(this.micMeter);
+    }
+    if (this.mic && this.mic.state == 'started') {
+        return this.micMeter.value * 100;
+    } else {
+        return 0;
+    }
+};
+
 /**
  * Names of the audio effects.
  * @readonly

From b14852ab3c147ed4569a5037e338d78ff771ce35 Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Mon, 27 Mar 2017 13:23:01 -0400
Subject: [PATCH 2/3] If mic is not enabled, return -1

To match Scratch 2.0 behavior
---
 src/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 94049ae..e38d7a2 100644
--- a/src/index.js
+++ b/src/index.js
@@ -162,7 +162,7 @@ AudioEngine.prototype.getLoudness = function () {
     if (this.mic && this.mic.state == 'started') {
         return this.micMeter.value * 100;
     } else {
-        return 0;
+        return -1;
     }
 };
 

From d08b5d2af9c680c15d0c561280259f45712bccb8 Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Tue, 4 Apr 2017 15:00:32 -0400
Subject: [PATCH 3/3] Update tone version 0.9.0

So we can use Tone.UserMedia
---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index ad66548..9f44834 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "json": "9.0.4",
     "minilog": "^3.0.1",
     "soundfont-player": "0.10.5",
-    "tone": "0.8.0",
+    "tone": "0.9.0",
     "travis-after-all": "1.4.4",
     "webpack": "1.13.2"
   },