From 43c67d84014b037a25deb4dd1534a530ed3eb5f3 Mon Sep 17 00:00:00 2001
From: "Phyks (Lucas Verney)" <phyks@phyks.me>
Date: Thu, 4 Mar 2021 22:44:05 +0100
Subject: [PATCH] Voice detection + bugfixes

---
 .gitignore        |    2 +
 README.md         |   11 +-
 end.mp3           |  Bin 0 -> 6686 bytes
 index.html        |  227 +++----
 index.js          |  191 ++++++
 package-lock.json | 1633 +++++++++++++++++++++++++++++++++++++++++++++
 package.json      |   22 +
 tick.mp3          |  Bin 0 -> 2398 bytes
 vad.js            |  129 ++++
 9 files changed, 2062 insertions(+), 153 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 end.mp3
 create mode 100644 index.js
 create mode 100644 package-lock.json
 create mode 100644 package.json
 create mode 100644 tick.mp3
 create mode 100644 vad.js

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d1c1dbe
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+bundle.js
diff --git a/README.md b/README.md
index a0bb242..51b2d8b 100644
--- a/README.md
+++ b/README.md
@@ -5,11 +5,20 @@ A simple timer for extracting expressos.
 
 ## Usage
 
-Just open `index.html` with your browser.
+```
+npm install
+npm run build
+```
+
+Then, just open `index.html` with your browser.
 
 
 ## License
 
+Tick sound from https://soundbible.com/2044-Tick.html.
+
+End sound from https://soundbible.com/1630-Computer-Magic.html.
+
 Code published under an MIT license.
 
 ```
diff --git a/end.mp3 b/end.mp3
new file mode 100644
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diff --git a/index.html b/index.html
index f47d0a8..05e3724 100644
--- a/index.html
+++ b/index.html
@@ -3,7 +3,6 @@
     <head>
         <meta charset="utf-8">
         <title>Espresso timer</title>
-        <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
         <link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900" rel="stylesheet">
         <link href="https://cdn.jsdelivr.net/npm/@mdi/font@4.x/css/materialdesignicons.min.css" rel="stylesheet">
         <link href="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.min.css" rel="stylesheet">
@@ -44,7 +43,7 @@
                             v-model="preinfusionTimer"
                             thumb-color="primary"
                             thumb-label="always"
-                            :readonly="interval !== null"
+                            :readonly="hasTimed || interval"
                             @change="storeValue('preinfusionTimer')"
                             min="0"
                             max="10"
@@ -61,12 +60,15 @@
                             v-model="totalTimer"
                             thumb-color="primary"
                             thumb-label="always"
-                            :readonly="interval !== null"
+                            :readonly="hasTimed || interval"
                             @change="storeValue('totalTimer')"
-                            min="0"
+                            :min="preinfusionTimer"
                             max="40"
                             ></v-slider>
                     </v-col>
+                    <v-col cols="2" v-if="extraTotalTime > 0">
+                        + {{ extraTotalTime }}s
+                    </v-col>
                 </v-row>
 
                 <v-row>
@@ -78,17 +80,61 @@
                             large
                             color="primary"
                             @click="buttonFunction"
+                            v-if="interval || voiceDetector || hasTimed"
                             >
-                            <v-icon dark v-if="interval">
+                            <v-icon dark v-if="interval || voiceDetector">
                                 mdi-stop
                             </v-icon>
                             <v-icon dark v-else-if="hasTimed">
                                 mdi-replay
                             </v-icon>
-                            <v-icon dark v-else>
-                                mdi-play
-                            </v-icon>
                         </v-btn>
+                        <v-dialog
+                            v-else
+                            v-model="dialogAudio"
+                            persistent
+                            max-width="290"
+                            >
+                            <template v-slot:activator="{ on, attrs }">
+                                <v-btn
+                                    class="mx-4"
+                                    fab
+                                    dark
+                                    large
+                                    color="primary"
+                                    v-bind="attrs"
+                                    v-on="on"
+                                    >
+                                    <v-icon dark>
+                                        mdi-play
+                                    </v-icon>
+                                </v-btn>
+                            </template>
+
+                            <v-card>
+                                <v-card-title class="headline">
+                                    Use audio detection?
+                                </v-card-title>
+                                <v-card-text>Trigger start/stop timer through voice level detection.</v-card-text>
+                                <v-card-actions>
+                                    <v-spacer></v-spacer>
+                                    <v-btn
+                                        color="green darken-1"
+                                        text
+                                        @click="noAudio"
+                                        >
+                                        No
+                                    </v-btn>
+                                    <v-btn
+                                        color="green darken-1"
+                                        text
+                                        @click="useAudio"
+                                        >
+                                        Yes
+                                    </v-btn>
+                                </v-card-actions>
+                            </v-card>
+                        </v-dialog>
                     </v-col>
                     <v-col cols="12" class="text-center" v-if="!interval && hasTimed">
                         <v-simple-table class="text-center">
@@ -136,156 +182,33 @@
                 <v-divider class="my-8"></v-divider>
 
                 <h2 class="text-h6 text-center">History</h2>
-                <v-simple-table class="text-center" fixed-header v-if="history.length > 0">
-                    <template v-slot:default>
-                        <thead>
-                            <tr>
-                                <th>
-                                    Grind level
-                                </th>
-                                <th>
-                                    Pre-infusion
-                                </th>
-                                <th>
-                                    Total time
-                                </th>
-                            </tr>
-                        </thead>
-                        <tbody>
-                            <tr v-for="point in history">
-                                <td>{{ point.grindLevel }}</td>
-                                <td>{{ point.preinfusionTime }}</td>
-                                <td>{{ point.totalTime }}</td>
-                            </tr>
-                        </tbody>
+                <v-dialog v-model="dialogDelete" max-width="290">
+                    <v-card>
+                        <v-card-title class="headline">Are you sure you want to delete this item?</v-card-title>
+                        <v-card-actions>
+                            <v-spacer></v-spacer>
+                            <v-btn color="blue darken-1" text @click="closeDelete">Cancel</v-btn>
+                            <v-btn color="blue darken-1" text @click="deleteItemConfirm">OK</v-btn>
+                            <v-spacer></v-spacer>
+                        </v-card-actions>
+                    </v-card>
+                </v-dialog>
+                <v-data-table :headers=historyHeaders :items="history">
+                    <template v-slot:item.actions="{ item }">
+                        <v-icon
+                            small
+                            @click="deleteItem(item)"
+                            >
+                            mdi-delete
+                        </v-icon>
                     </template>
-                </v-simple-table>
-                <p class="text-center" v-else>/</p>
+                </v-data-table>
             </v-container>
         </v-main>
     </v-app>
   </div>
     <script src="https://cdn.jsdelivr.net/npm/vue@2.x/dist/vue.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.js"></script>
-    <script type="text/javascript">
-// TODO: PWA
-var ONE_SECOND = 1000;
-
-function requestMic(handleSuccess, handleError) {
-  try {
-      window.AudioContext = window.AudioContext || window.webkitAudioContext;
-      audioContext = new AudioContext();
-
-      navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
-      navigator.getUserMedia({audio: true}, handleSuccess, handleError);
-  } catch (e) {
-      handleError();
-  }
-}
-
-var app = new Vue({
-    el: '#app',
-    vuetify: new Vuetify(),
-    data: {
-        //audioBeep: new Audio('audio_file.mp3'),
-        //audioEnd: new Audio('audio_file.mp3'),
-        hasTimed: false,
-        interval: null,
-        grindLevel: window.localStorage.getItem('grindLevel') || 5,
-        initialPreinfusionTimer: null,
-        preinfusionTimer: window.localStorage.getItem('preinfusionTimer') || 4,
-        initialTotalTimer: null,
-        totalTimer: window.localStorage.getItem('totalTimer') || 25,
-        extraTotalTime: 0,
-        history: window.localStorage.getItem('history') || [],
-    },
-    methods: {
-        buttonFunction() {
-            if (this.interval) {
-                return this.stopTimer();
-            }
-            else if (this.hasTimed) {
-                return this.resetFunction();
-            }
-            return this.startTimer();
-        },
-        resetFunction() {
-            this.stopTimer();
-            this.hasTimed = false;
-
-            this.extraTotalTime = 0;
-            if (this.initialPreinfusionTimer) {
-                this.preinfusionTimer = this.initialPreinfusionTimer;
-            }
-            if (this.initialTotalTimer) {
-                this.totalTimer = this.initialTotalTimer;
-            }
-        },
-        saveFunction() {
-            this.history.push({
-                grindLevel: this.grindLevel,
-                preinfusionTime: this.initialPreinfusionTimer - this.preinfusionTimer,
-                totalTime: this.initialTotalTimer - this.totalTimer + this.extraTotalTime,
-            });
-            this.storeValue('history');
-            this.resetFunction();
-        },
-        startTimer() {
-            var handleSuccess = (stream) => {
-                var options = {
-                    onVoiceStart: function() {
-                        console.log('voice start');
-                    },
-                    onVoiceStop: function() {
-                        console.log('voice stop');
-                    },
-                    onUpdate: function(val) {
-                        console.log('curr val:', val);
-                    }
-                };
-                // TODO: vad(audioContext, stream, options);
-            };
-            requestMic(
-                handleSuccess,
-                () => {
-                    console.warn('Could not connect microphone. Possibly rejected by the user or blocked by the browser.');
-
-                    console.log('Starting timer without voice detection.')
-                    this.hasTimed = true;
-
-                    this.initialPreinfusionTimer = this.preinfusionTimer;
-                    this.initialTotalTimer = this.totalTimer;
-
-                    this.interval = window.setInterval(() => {
-                        // TODO: this.audioBeep.play();
-                        if (this.preinfusionTimer > 0) {
-                            this.preinfusionTimer -= 1;
-                        } else {
-                            if (this.totalTimer > 0) {
-                                this.totalTimer -= 1;
-                            } else {
-                                if (this.totalTimer == 0) {
-                                    // TODO: this.audioEnd.play();
-                                }
-                                this.extraTotalTime += 1;
-                            }
-                        }
-                    }, ONE_SECOND);
-                }
-            );
-        },
-        stopTimer() {
-            console.log('Timer stopped.')
-            if (this.interval) {
-                window.clearInterval(this.interval);
-            }
-            this.interval = null;
-        },
-        storeValue(item) {
-            window.localStorage.setItem(item, this[item]);
-        },
-    },
-});
-</script>
+    <script src="./bundle.js"></script>
 </body>
 </html>
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..8d48bff
--- /dev/null
+++ b/index.js
@@ -0,0 +1,191 @@
+var vad = require('./vad.js');
+
+(function () {
+    // TODO: PWA
+    var ONE_SECOND = 1000;
+    var AUDIO_THRESHOLD = 0.5;
+
+    function requestMic(handleSuccess, handleError) {
+        try {
+            window.AudioContext = window.AudioContext || window.webkitAudioContext;
+            audioContext = new AudioContext();
+
+            navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
+            navigator.getUserMedia({audio: true}, handleSuccess, handleError);
+        } catch (e) {
+            handleError();
+        }
+    }
+
+    var app = new Vue({
+        el: '#app',
+        vuetify: new Vuetify(),
+        data: {
+            audioTick: new Audio('./tick.mp3?cache-buster=' + Date.now()),
+            audioEnd: new Audio('./end.mp3?cache-buster=' + Date.now()),
+            dialogAudio: false,
+            dialogDelete: false,
+            hasTimed: false,
+            interval: null,
+            grindLevel: window.localStorage.getItem('grindLevel') || 5,
+            initialPreinfusionTimer: null,
+            preinfusionTimer: window.localStorage.getItem('preinfusionTimer') || 4,
+            initialTotalTimer: null,
+            totalTimer: window.localStorage.getItem('totalTimer') || 25,
+            extraTotalTime: 0,
+            shouldUseAudio: false,
+            voiceDetector: null,
+            voiceActivityStartDate: new Date(0),
+            history: JSON.parse(window.localStorage.getItem('history')) || [],
+            historyHeaders: [
+                {
+                    text: 'Grind level',
+                    value: 'grindLevel',
+                },
+                {
+                    text: 'Pre-infusion time',
+                    value: 'preinfusionTime',
+                },
+                {
+                    text: 'Total time',
+                    value: 'totalTime',
+                },
+                {
+                    text: 'Actions',
+                    value: 'actions',
+                    sortable: false,
+                },
+            ],
+        },
+        methods: {
+            buttonFunction() {
+                if (this.interval || this.voiceDetector) {
+                    return this.stopTimer();
+                }
+                else if (this.hasTimed) {
+                    return this.resetFunction();
+                }
+                return this.startTimer();
+            },
+            resetFunction() {
+                this.stopTimer();
+                this.hasTimed = false;
+
+                this.extraTotalTime = 0;
+                if (this.initialPreinfusionTimer) {
+                    this.preinfusionTimer = this.initialPreinfusionTimer;
+                }
+                if (this.initialTotalTimer) {
+                    this.totalTimer = this.initialTotalTimer;
+                }
+            },
+            saveFunction() {
+                this.history.push({
+                    grindLevel: this.grindLevel,
+                    preinfusionTime: this.initialPreinfusionTimer - this.preinfusionTimer,
+                    totalTime: this.initialTotalTimer - this.totalTimer + this.extraTotalTime,
+                });
+                this.storeValue('history');
+                this.resetFunction();
+            },
+            noAudio() {
+                this.shouldUseAudio = false;
+                this.dialogAudio = false;
+                this.startTimer();
+            },
+            useAudio() {
+                this.shouldUseAudio = true;
+                this.dialogAudio = false;
+                this.startTimer();
+            },
+            startTimer() {
+                let doTimer = () => {
+                    this.hasTimed = true;
+
+                    this.initialPreinfusionTimer = this.preinfusionTimer;
+                    this.initialTotalTimer = this.totalTimer;
+
+                    this.interval = window.setInterval(() => {
+                        if (this.preinfusionTimer > 0) {
+                            this.preinfusionTimer -= 1;
+                        }
+
+                        let previousTotalTimer = this.totalTimer;
+                        if (this.totalTimer > 0) {
+                            this.totalTimer -= 1;
+                        } else {
+                            this.extraTotalTime += 1;
+                        }
+
+                        if (previousTotalTimer > 0 && this.totalTimer == 0) {
+                            this.audioEnd.play();
+                        } else {
+                            this.audioTick.play();
+                        }
+                    }, ONE_SECOND);
+                };
+
+                if (this.shouldUseAudio) {
+                    console.log('Starting timer with voice detection.')
+
+                    var handleSuccess = (stream) => {
+                        var options = {
+                            onUpdate: (val) => {
+                                if (
+                                    val > AUDIO_THRESHOLD
+                                    && (new Date()) - this.voiceActivityStartDate > ONE_SECOND
+                                ) {
+                                    this.voiceActivityStartDate = new Date();
+                                    if (this.hasTimed) {
+                                        console.log(`Stopping timer due to voice (value: ${val}).`)
+                                        this.stopTimer();
+                                    } else {
+                                        console.log(`Starting timer due to voice (value: ${val}).`)
+                                        doTimer();
+                                    }
+                                }
+                            }
+                        };
+                        this.voiceDetector = vad(audioContext, stream, options);
+                    };
+                    requestMic(
+                        handleSuccess,
+                        () => window.alert('Unable to access microphone...')
+                    );
+                } else {
+                    console.log('Starting timer directly.')
+                    doTimer();
+                }
+            },
+            stopTimer() {
+                console.log('Timer stopped.')
+                if (this.interval) {
+                    window.clearInterval(this.interval);
+                }
+                if (this.voiceDetector) {
+                    this.voiceDetector.destroy();
+                    this.voiceDetector = null;
+                }
+                this.interval = null;
+            },
+            deleteItem(item) {
+                this.deletedIndex = this.history.indexOf(item);
+                this.dialogDelete = true;
+            },
+            closeDelete() {
+                this.dialogDelete = false;
+                this.$nextTick(() => {
+                    this.deletedIndex = -1;
+                })
+            },
+            deleteItemConfirm () {
+                this.history.splice(this.deletedIndex, 1);
+                this.storeValue('history');
+                this.closeDelete();
+            },
+            storeValue(item) {
+                window.localStorage.setItem(item, JSON.stringify(this[item]));
+            },
+        },
+    });
+})();
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..a1b0fe5
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1633 @@
+{
+  "name": "expresso-timer",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "JSONStream": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
+      "integrity": "sha512-E+iruNOY8VV9s4JEbe1aNEm6MiszPRr/UfcHMz0TQh1BXSxHK+ASV1R6W4HpjBhSeS+54PIsAMCBmwD06LLsqQ==",
+      "dev": true,
+      "requires": {
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
+      }
+    },
+    "acorn": {
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
+      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
+      "dev": true
+    },
+    "acorn-node": {
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/acorn-node/-/acorn-node-1.8.2.tgz",
+      "integrity": "sha512-8mt+fslDufLYntIoPAaIMUe/lrbrehIiwmR3t2k9LljIzoigEPF27eLk2hy8zSGzmR/ogr7zbRKINMo1u0yh5A==",
+      "dev": true,
+      "requires": {
+        "acorn": "^7.0.0",
+        "acorn-walk": "^7.0.0",
+        "xtend": "^4.0.2"
+      }
+    },
+    "acorn-walk": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
+      "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==",
+      "dev": true
+    },
+    "analyser-frequency-average": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/analyser-frequency-average/-/analyser-frequency-average-1.0.0.tgz",
+      "integrity": "sha1-LlNj0C8hZ722HR7QQkQDcVtxmoY=",
+      "requires": {
+        "audio-frequency-to-index": "^2.0.0"
+      }
+    },
+    "array-filter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-1.0.0.tgz",
+      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM=",
+      "dev": true
+    },
+    "asn1.js": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
+      "dev": true,
+      "requires": {
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+          "dev": true
+        }
+      }
+    },
+    "assert": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/assert/-/assert-1.5.0.tgz",
+      "integrity": "sha512-EDsgawzwoun2CZkCgtxJbv392v4nbk9XDD06zI+kQYoBM/3RBWLlEyJARDOmhAAosBjWACEkKL6S+lIZtcAubA==",
+      "dev": true,
+      "requires": {
+        "object-assign": "^4.1.1",
+        "util": "0.10.3"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
+          "dev": true
+        },
+        "util": {
+          "version": "0.10.3",
+          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+          "dev": true,
+          "requires": {
+            "inherits": "2.0.1"
+          }
+        }
+      }
+    },
+    "audio-frequency-to-index": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/audio-frequency-to-index/-/audio-frequency-to-index-2.0.0.tgz",
+      "integrity": "sha1-TEvKnzv+w4x3Oqa1YEwRetyYLUU=",
+      "requires": {
+        "clamp": "^1.0.1"
+      }
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+    "available-typed-arrays": {
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+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.2.tgz",
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+      "dev": true,
+      "requires": {
+        "array-filter": "^1.0.0"
+      }
+    },
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "dev": true
+    },
+    "bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw==",
+      "dev": true
+    },
+    "brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "requires": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "brorand": {
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+      "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
+      "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=",
+      "dev": true
+    },
+    "browser-pack": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/browser-pack/-/browser-pack-6.1.0.tgz",
+      "integrity": "sha512-erYug8XoqzU3IfcU8fUgyHqyOXqIE4tUTTQ+7mqUjQlvnXkOO6OlT9c/ZoJVHYoAaqGxr09CN53G7XIsO4KtWA==",
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+      "requires": {
+        "JSONStream": "^1.0.3",
+        "combine-source-map": "~0.8.0",
+        "defined": "^1.0.0",
+        "safe-buffer": "^5.1.1",
+        "through2": "^2.0.0",
+        "umd": "^3.0.0"
+      }
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+      "requires": {
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+        "assert": "^1.4.0",
+        "browser-pack": "^6.0.1",
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+        "browserify-zlib": "~0.2.0",
+        "buffer": "~5.2.1",
+        "cached-path-relative": "^1.0.0",
+        "concat-stream": "^1.6.0",
+        "console-browserify": "^1.1.0",
+        "constants-browserify": "~1.0.0",
+        "crypto-browserify": "^3.0.0",
+        "defined": "^1.0.0",
+        "deps-sort": "^2.0.1",
+        "domain-browser": "^1.2.0",
+        "duplexer2": "~0.1.2",
+        "events": "^3.0.0",
+        "glob": "^7.1.0",
+        "has": "^1.0.0",
+        "htmlescape": "^1.1.0",
+        "https-browserify": "^1.0.0",
+        "inherits": "~2.0.1",
+        "insert-module-globals": "^7.2.1",
+        "labeled-stream-splicer": "^2.0.0",
+        "mkdirp-classic": "^0.5.2",
+        "module-deps": "^6.2.3",
+        "os-browserify": "~0.3.0",
+        "parents": "^1.0.1",
+        "path-browserify": "^1.0.0",
+        "process": "~0.11.0",
+        "punycode": "^1.3.2",
+        "querystring-es3": "~0.2.0",
+        "read-only-stream": "^2.0.0",
+        "readable-stream": "^2.0.2",
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..ce8f696
--- /dev/null
+++ b/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "expresso-timer",
+  "version": "1.0.0",
+  "description": "Expresso timer ==============",
+  "main": "index.js",
+  "scripts": {
+    "build": "rimraf bundle.js && browserify index.js > bundle.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "gitea@git.phyks.me:phyks/expresso-timer.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "analyser-frequency-average": "^1.0.0"
+  },
+  "devDependencies": {
+    "browserify": "^17.0.0",
+    "rimraf": "^3.0.2"
+  }
+}
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diff --git a/vad.js b/vad.js
new file mode 100644
index 0000000..f705263
--- /dev/null
+++ b/vad.js
@@ -0,0 +1,129 @@
+'use strict';
+// From https://github.com/johni0702/voice-activity-detection
+var analyserFrequency = require('analyser-frequency-average');
+
+module.exports = function(audioContext, stream, opts) {
+
+  opts = opts || {};
+
+  var defaults = {
+    fftSize: 1024,
+    bufferLen: 1024,
+    smoothingTimeConstant: 0.2,
+    minCaptureFreq: 85,         // in Hz
+    maxCaptureFreq: 255,        // in Hz
+    noiseCaptureDuration: 1000, // in ms
+    minNoiseLevel: 0.3,         // from 0 to 1
+    maxNoiseLevel: 0.7,         // from 0 to 1
+    avgNoiseMultiplier: 1.2,
+    onVoiceStart: function() {
+    },
+    onVoiceStop: function() {
+    },
+    onUpdate: function(val) {
+    }
+  };
+
+  var options = {};
+  for (var key in defaults) {
+    options[key] = opts.hasOwnProperty(key) ? opts[key] : defaults[key];
+  }
+
+  var baseLevel = 0;
+  var voiceScale = 1;
+  var activityCounter = 0;
+  var activityCounterMin = 0;
+  var activityCounterMax = 60;
+  var activityCounterThresh = 5;
+
+  var envFreqRange = [];
+  var isNoiseCapturing = true;
+  var prevVadState = undefined;
+  var vadState = false;
+  var captureTimeout = null;
+
+  var source = audioContext.createMediaStreamSource(stream);
+  var analyser = audioContext.createAnalyser();
+  analyser.smoothingTimeConstant = options.smoothingTimeConstant;
+  analyser.fftSize = options.fftSize;
+
+  var scriptProcessorNode = audioContext.createScriptProcessor(options.bufferLen, 1, 1);
+  connect();
+  scriptProcessorNode.onaudioprocess = monitor;
+
+  if (isNoiseCapturing) {
+    //console.log('VAD: start noise capturing');
+    captureTimeout = setTimeout(init, options.noiseCaptureDuration);
+  }
+
+  function init() {
+    //console.log('VAD: stop noise capturing');
+    isNoiseCapturing = false;
+
+    envFreqRange = envFreqRange.filter(function(val) {
+      return val;
+    }).sort();
+    var averageEnvFreq = envFreqRange.length ? envFreqRange.reduce(function (p, c) { return Math.min(p, c) }, 1) : (options.minNoiseLevel || 0.1);
+
+    baseLevel = averageEnvFreq * options.avgNoiseMultiplier;
+    if (options.minNoiseLevel && baseLevel < options.minNoiseLevel) baseLevel = options.minNoiseLevel;
+    if (options.maxNoiseLevel && baseLevel > options.maxNoiseLevel) baseLevel = options.maxNoiseLevel;
+
+    voiceScale = 1 - baseLevel;
+
+    //console.log('VAD: base level:', baseLevel);
+  }
+
+  function connect() {
+    source.connect(analyser);
+    analyser.connect(scriptProcessorNode);
+    scriptProcessorNode.connect(audioContext.destination);
+  }
+
+  function disconnect() {
+    scriptProcessorNode.disconnect();
+  }
+
+  function destroy() {
+    captureTimeout && clearTimeout(captureTimeout);
+    disconnect();
+    analyser.disconnect();
+    source.disconnect();
+    source.mediaStream.getTracks().forEach(track => track.stop());
+  }
+
+  function monitor() {
+    var frequencies = new Uint8Array(analyser.frequencyBinCount);
+    analyser.getByteFrequencyData(frequencies);
+
+    var average = analyserFrequency(analyser, frequencies, options.minCaptureFreq, options.maxCaptureFreq);
+    if (isNoiseCapturing) {
+      envFreqRange.push(average);
+      return;
+    }
+
+    if (average >= baseLevel && activityCounter < activityCounterMax) {
+      activityCounter++;
+    } else if (average < baseLevel && activityCounter > activityCounterMin) {
+      activityCounter--;
+    }
+    vadState = activityCounter > activityCounterThresh;
+
+    if (prevVadState !== vadState) {
+      vadState ? onVoiceStart() : onVoiceStop();
+      prevVadState = vadState;
+    }
+
+    options.onUpdate(Math.max(0, average - baseLevel) / voiceScale);
+  }
+
+  function onVoiceStart() {
+    options.onVoiceStart();
+  }
+
+  function onVoiceStop() {
+    options.onVoiceStop();
+  }
+
+  return {connect: connect, disconnect: disconnect, destroy: destroy};
+};