validate Replay Gain at api

Author: tamland

src/player/audio.ts

@@ -23,7 +23,6 @@ export class AudioController {
   private statsListener : any = null
   private replayGainMode = ReplayGainMode.None
   private replayGain: ReplayGain | null = null
-  private preAmp = 0.0
 
   ontimeupdate: (value: number) => void = () => { /* do nothing */ }
   ondurationchange: (value: number) => void = () => { /* do nothing */ }
@@ -181,14 +180,9 @@ export class AudioController {
   }
 
   private replayGainFactor(): number {
-    if (this.replayGainMode === ReplayGainMode.None) {
+    if (this.replayGainMode === ReplayGainMode.None || !this.replayGain) {
       return 1.0
     }
-    if (!this.replayGain) {
-      console.warn('AudioController: no ReplayGain information')
-      return 1.0
-    }
-
     const gain = this.replayGainMode === ReplayGainMode.Track
       ? this.replayGain.trackGain
       : this.replayGain.albumGain
@@ -204,7 +198,8 @@ export class AudioController {
 
     // Implementing min(10^((RG + Gpre-amp)/20), 1/peakamplitude)
     // https://wiki.hydrogenaud.io/index.php?title=ReplayGain_2.0_specification
-    const gainFactor = Math.pow(10, (gain + this.preAmp) / 20)
+    const preAmp = 0.0
+    const gainFactor = Math.pow(10, (gain + preAmp) / 20)
     const peakFactor = 1 / peak
     const factor = Math.min(gainFactor, peakFactor)
 

src/shared/api.ts

@@ -24,7 +24,12 @@ export interface Track {
   isPodcast?: boolean
   isUnavailable?: boolean
   playCount?: number
-  replayGain?: {trackGain: number, trackPeak: number, albumGain: number, albumPeak: number}
+  replayGain?: {
+    trackGain: number
+    trackPeak: number
+    albumGain: number
+    albumPeak: number
+  }
 }
 
 export interface Genre {
@@ -529,6 +534,14 @@ export class API {
   }
 
   private normalizeTrack(item: any): Track {
+    const replayGain =
+      Number.isFinite(item.replayGain?.trackGain) &&
+      Number.isFinite(item.replayGain?.albumGain) &&
+      item.replayGain?.trackPeak > 0 &&
+      item.replayGain?.albumPeak > 0
+        ? item.replayGain
+        : null
+
     return {
       id: item.id,
       title: item.title,
@@ -542,7 +555,7 @@ export class API {
         : [{ id: item.artistId, name: item.artist }],
       url: this.getStreamUrl(item.id),
       image: this.getCoverArtUrl(item),
-      replayGain: item.replayGain,
+      replayGain,
     }
   }