feat: Enhance PlaybackService with proactive buffering and queue management for improved background playback

ios/Gemfile.lock

@@ -111,17 +111,16 @@ GEM
       ffi (>= 1.15.0)
     event_emitter (0.2.6)
     excon (0.112.0)
-    faraday (1.10.4)
+    faraday (1.8.0)
       faraday-em_http (~> 1.0)
       faraday-em_synchrony (~> 1.0)
       faraday-excon (~> 1.1)
-      faraday-httpclient (~> 1.0)
-      faraday-multipart (~> 1.0)
+      faraday-httpclient (~> 1.0.1)
       faraday-net_http (~> 1.0)
-      faraday-net_http_persistent (~> 1.0)
+      faraday-net_http_persistent (~> 1.1)
       faraday-patron (~> 1.0)
       faraday-rack (~> 1.0)
-      faraday-retry (~> 1.0)
+      multipart-post (>= 1.2, < 3)
       ruby2_keywords (>= 0.0.4)
     faraday-cookie_jar (0.0.7)
       faraday (>= 0.8.0)
@@ -130,13 +129,10 @@ GEM
     faraday-em_synchrony (1.0.0)
     faraday-excon (1.1.0)
     faraday-httpclient (1.0.1)
-    faraday-multipart (1.1.0)
-      multipart-post (~> 2.0)
     faraday-net_http (1.0.2)
     faraday-net_http_persistent (1.2.0)
     faraday-patron (1.0.0)
     faraday-rack (1.0.0)
-    faraday-retry (1.0.3)
     faraday_middleware (1.2.1)
       faraday (~> 1.0)
     fastimage (2.4.0)
@@ -255,7 +251,8 @@ GEM
     mime-types-data (3.2025.0610)
     mini_magick (4.13.2)
     mini_mime (1.1.5)
-    minitest (5.25.5)
+    minitest (6.0.1)
+      prism (~> 1.5)
     molinillo (0.8.0)
     multi_json (1.15.0)
     multipart-post (2.4.1)
@@ -270,6 +267,7 @@ GEM
       ffi
     os (1.1.4)
     plist (3.7.2)
+    prism (1.7.0)
     public_suffix (4.0.7)
     rake (13.3.0)
     rbnacl (3.4.0)

ios/Podfile.lock

@@ -3598,7 +3598,7 @@ SPEC CHECKSUMS:
   Gifu: 9f7e52357d41c0739709019eb80a71ad9aab1b6d
   glog: 5683914934d5b6e4240e497e0f4a3b42d1854183
   google-cast-sdk: 32f65af50d164e3c475e79ad123db3cc26fbcd37
-  hermes-engine: 83ac7cadb2a3a158ae6d9e4192417c5232065e99
+  hermes-engine: 6c2b048484247d03ebf5a9bbe01dd70c28654a1e
   MMKVCore: f2dd4c9befea04277a55e84e7812f930537993df
   NitroFetch: 660adfb47f84b28db664f97b50e5dc28506ab6c1
   NitroMmkv: 8ed7ef6f41b91785fc580c975f68d6d675214767

src/player/index.ts

@@ -1,12 +1,18 @@
 import TrackPlayer, { Event } from 'react-native-track-player'
 import { CarPlay } from 'react-native-carplay'
 import { previous, skip } from '../hooks/player/functions/controls'
+import { usePlayerQueueStore } from '../stores/player/queue'
+import { optimizePlayerQueue } from './helpers/gapless'
+import { PREFETCH_THRESHOLD_SECONDS } from '../configs/gapless.config'
 
 /**
  * Jellify Playback Service.
  *
  * Sets up event listeners for remote control events and
- * runs for the duration of the app lifecycle
+ * runs for the duration of the app lifecycle.
+ *
+ * Also handles background queue optimization to ensure tracks
+ * are buffered before they're needed (fixes iOS background playback).
  */
 export async function PlaybackService() {
 	TrackPlayer.addEventListener(Event.RemotePlay, async () => {
@@ -23,6 +29,49 @@ export async function PlaybackService() {
 	TrackPlayer.addEventListener(Event.RemoteSeek, async (event) => {
 		await TrackPlayer.seekTo(event.position)
 	})
+
+	/**
+	 * Monitor playback progress to proactively buffer upcoming tracks.
+	 * This runs even when the app is backgrounded, ensuring the next track
+	 * is ready before the current one ends.
+	 */
+	TrackPlayer.addEventListener(Event.PlaybackProgressUpdated, async (event) => {
+		const { position, duration } = event
+
+		if (!duration || duration <= 0) return
+
+		const remainingSeconds = duration - position
+
+		// When approaching the end of a track, ensure upcoming tracks are in the queue
+		if (remainingSeconds <= PREFETCH_THRESHOLD_SECONDS && remainingSeconds > 0) {
+			const queue = usePlayerQueueStore.getState().queue
+			const currentIndex = usePlayerQueueStore.getState().currentIndex
+
+			if (queue.length > 0 && currentIndex !== undefined) {
+				await optimizePlayerQueue(queue, currentIndex)
+			}
+		}
+	})
+
+	/**
+	 * Handle the case where the player queue ends unexpectedly.
+	 * This can happen if iOS throttles network requests for backgrounded apps.
+	 * When the app queue has more tracks, add them and resume playback.
+	 */
+	TrackPlayer.addEventListener(Event.PlaybackQueueEnded, async () => {
+		const queue = usePlayerQueueStore.getState().queue
+		const currentIndex = usePlayerQueueStore.getState().currentIndex
+
+		// If there are more tracks in the app queue that aren't in the player queue
+		if (currentIndex !== undefined && currentIndex < queue.length - 1) {
+			const remainingTracks = queue.slice(currentIndex + 1)
+
+			if (remainingTracks.length > 0) {
+				await TrackPlayer.add(remainingTracks)
+				await TrackPlayer.play()
+			}
+		}
+	})
 }
 
 export function registerAutoService(onConnect: () => void, onDisconnect: () => void) {