add auto seekback

android/app/src/main/java/com/audiobookshelf/app/PlayerNotificationService.kt

@@ -488,6 +488,19 @@ class PlayerNotificationService : MediaBrowserServiceCompat()  {
     return lastPauseTime
   }
 
+  fun calcPauseSeekBackTime() : Long {
+    if (lastPauseTime <= 0) return 0
+    var time: Long = System.currentTimeMillis() - lastPauseTime
+    var seekback: Long = 0
+    if (time < 3) seekback = 0
+    else if (time < 60000) seekback = time / 6
+    else if (time < 300000) seekback = 15000
+    else if (time < 1800000) seekback = 20000
+    else if (time < 3600000) seekback = 25000
+    else seekback = 29500
+    return seekback
+  }
+
   fun getPlayStatus() : Boolean {
     return mPlayer.isPlaying
   }
@@ -501,6 +514,12 @@ class PlayerNotificationService : MediaBrowserServiceCompat()  {
       Log.d(tag, "Already playing")
       return
     }
+    if (lastPauseTime > 0) {
+      var backTime = calcPauseSeekBackTime()
+      if (backTime >= mPlayer.currentPosition) backTime = mPlayer.currentPosition - 500
+      Log.d(tag, "SeekBackTime $backTime")
+      seekBackward(backTime)
+    }
     mPlayer.play()
   }
 

components/AudioPlayerMini.vue

@@ -198,6 +198,17 @@ export default {
         this.pause()
       }
     },
+    calcSeekBackTime(lastUpdate) {
+      var time = Date.now() - lastUpdate
+      var seekback = 0
+      if (time < 3) seekback = 0
+      else if (time < 60000) seekback = time / 6
+      else if (time < 300000) seekback = 15000
+      else if (time < 1800000) seekback = 20000
+      else if (time < 3600000) seekback = 25000
+      else seekback = 29500
+      return seekback
+    },
     async set(audiobookStreamData, stream, fromAppDestroy) {
       this.isResetting = false
       this.initObject = { ...audiobookStreamData }
@@ -222,6 +233,17 @@ export default {
           init = false
           this.initObject.startTime = String(Math.floor(this.currentTime * 1000))
         }
+        //new audiobook stream or sync from other client
+        else if (stream.clientCurrentTime > 0) {
+          console.log('new audiobook stream or sync from other client')
+          if (!!stream.lastUpdate) {
+            var backTime = this.calcSeekBackTime(stream.lastUpdate)
+            var currentTime = Math.floor(stream.clientCurrentTime * 1000)
+            if (backTime >= currentTime) backTime = currentTime - 500
+            console.log('SeekBackTime', backTime)
+            this.initObject.startTime = String(Math.floor(currentTime - backTime))
+          }
+        }
       }
       this.currentPlaybackRate = this.initObject.playbackSpeed
       if (init) MyNativeAudio.initPlayer(this.initObject).then((res) => {