use SoundCheck/ReplayGain for normalization

package.json

@@ -25,6 +25,7 @@
     "discord-rpc": "^4.0.1",
     "ejs": "^3.1.6",
     "electron-acrylic-window": "^0.5.11",
+    "electron-fetch": "^1.7.4",
     "electron-log": "^4.4.3",
     "electron-store": "^8.0.1",
     "electron-updater": "^4.6.1",
@@ -32,7 +33,9 @@
     "express": "^4.17.2",
     "get-port": "^5.1.1",
     "lastfmapi": "^0.1.1",
+    "media-metadata": "^2.1.0",
     "mpris-service": "^2.1.2",
+    "music-metadata": "^7.11.4",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "source-map-support": "^0.5.21",

src/main/cider-base.js

@@ -9,6 +9,8 @@ const yt = require('youtube-search-without-api-key');
 const discord = require('./discordrpc');
 const lastfm = require('./lastfm');
 const mpris = require('./mpris');
+const mm = require('music-metadata');
+const fetch = require('electron-fetch').default;
 
 // Analytics for debugging.
 const ElectronSentry = require("@sentry/electron");
@@ -216,6 +218,7 @@ const CiderBase = {
             lastfm.scrobbleSong(a)
             lastfm.updateNowPlayingSong(a)
         });
+
         ipcMain.on('nowPlayingItemDidChange', (_event, a) => {
             app.media = a;
             discord.updateActivity(a)
@@ -224,6 +227,21 @@ const CiderBase = {
             lastfm.updateNowPlayingSong(a)
         });
 
+        ipcMain.on("getPreviewURL", (_event, url) => {
+            fetch(url)
+            .then(res => res.buffer())
+            .then(async (buffer) => {
+                try {
+                    const metadata = await mm.parseBuffer(buffer, 'audio/x-m4a');
+                    SoundCheckTag = metadata.native.iTunes[1].value
+                    console.log(SoundCheckTag)
+                    win.webContents.send('SoundCheckTag',SoundCheckTag)
+                  } catch (error) {
+                    console.error(error.message);
+                  }
+            })
+        });
+
         return win
     },
 

src/renderer/audio/audio.js

@@ -28,32 +28,8 @@ var CiderAudio = {
             CiderAudio.normalizerOn()
         }
     },
-    normalizerOn: function (){
-        let tuna = Tuna(CiderAudio.context)
-         if (!CiderAudio.audioNodes.compressorNode){
-         CiderAudio.audioNodes.compressorNode = new tuna.Compressor({
-            threshold: -80,    //-100 to 0
-            makeupGain: 5,     //0 and up (in decibels)
-            attack: 2,         //0 to 1000
-            release: 200,      //0 to 3000
-            ratio: 8,          //1 to 20
-            knee: 0,           //0 to 40
-            automakeup: false, //true/false
-            bypass: 0
-        });
-        }
-        try{
-        CiderAudio.audioNodes.gainNode.disconnect(CiderAudio.context.destination);
-        } catch (e){}
-        CiderAudio.audioNodes.gainNode.connect(CiderAudio.audioNodes.compressorNode);
-        CiderAudio.audioNodes.compressorNode.connect(CiderAudio.context.destination);
-    },
+    normalizerOn: function (){},
     normalizerOff: function (){
-        try{
-        CiderAudio.audioNodes.compressorNode.disconnect();
-        CiderAudio.audioNodes.compressorNode = null
-        } catch (e){}
-        CiderAudio.audioNodes.gainNode.connect(CiderAudio.context.destination);
     }
 
 }

src/renderer/index.js

@@ -463,6 +463,15 @@ const app = new Vue({
 
             MusicKit.getInstance().videoContainerElement = document.getElementById("apple-music-video-player")
 
+            ipcRenderer.on('SoundCheckTag', (event, tag) => {
+               console.log(tag)
+               let replaygain = self.parseSCTagToRG(tag)
+               try {
+                CiderAudio.audioNodes.gainNode.gain.value = (1 - Math.min(Math.pow(10, (replaygain.gain / 20)), (1 / replaygain.peak)))
+               } catch (e){
+                
+               }
+            })
 
             this.mk.addEventListener(MusicKit.Events.playbackTimeDidChange, (a) => {
                 self.lyriccurrenttime = self.mk.currentPlaybackTime
@@ -480,6 +489,10 @@ const app = new Vue({
                 } catch (_) {
                 }
 
+                if (app.cfg.audio.normalization){
+                  try{ ipcRenderer.send('getPreviewURL', self.mk.nowPlayingItem.previewURL)} catch(e){}
+                }
+
                 let type = (self.mk.nowPlayingItem != null) ? self.mk.nowPlayingItem["type"] ?? '' : '';
 
                 if (type.includes("musicVideo") || type.includes("uploadedVideo") || type.includes("music-movie")) {
@@ -2501,6 +2514,22 @@ const app = new Vue({
                     element.innerHTML = `Disconnect\n<p style="font-size: 8px"><i>(Authed: ${lfmAuthKey})</i></p>`;
                     element.onclick = app.LastFMDeauthorize;
                 });
+            },
+            parseSCTagToRG: function(tag){
+                let soundcheck = tag.split(" ")
+                let numbers = []
+                for (item of soundcheck){
+                    numbers.push(parseInt(item, 16))
+                   
+                }
+                numbers.shift()
+                let gain = Math.log10((Math.max(numbers[0],numbers[1]) ?? 1000) / 1000.0) * -10
+                let peak = Math.max(numbers[6],numbers[7]) / 32768.0
+                console.log(gain,peak)
+                return {
+                    gain: gain,
+                    peak: peak
+                }
             }
         
     }