fix(playback): prevent native subtitle autoselect

android/app/src/main/kotlin/com/edde746/plezy/exoplayer/ExoPlayerCore.kt

@@ -440,7 +440,6 @@ class ExoPlayerCore(private val activity: Activity) : Player.Listener {
             // encoded audio track when capabilities come back. See androidx/media#2258.
             .setAllowInvalidateSelectionsOnRendererCapabilitiesChange(true)
             .setTrackTypeDisabled(C.TRACK_TYPE_TEXT, false)
-            .setPreferredTextLanguage("en")
         )
       }
 
@@ -2279,7 +2278,7 @@ class ExoPlayerCore(private val activity: Activity) : Player.Listener {
     startPositionMs: Long,
     autoPlay: Boolean,
     isLive: Boolean = false,
-    externalSubtitleList: List<Map<String, String?>>? = null
+    externalSubtitleList: List<Map<String, Any?>>? = null
   ) {
     if (!isInitialized) return
 
@@ -2330,12 +2329,22 @@ class ExoPlayerCore(private val activity: Activity) : Player.Listener {
 
     // Build external subtitle configurations (attached to MediaItem before prepare)
     externalSubtitleList?.forEachIndexed { index, sub ->
-      val subUri = sub["uri"] ?: return@forEachIndexed
+      val subUri = sub["uri"] as? String ?: return@forEachIndexed
+      val title = sub["title"] as? String
+      val language = sub["language"] as? String
+      val codec = sub["codec"] as? String
+      val mimeType = sub["mimeType"] as? String
+      val isDefault = sub["isDefault"] as? Boolean ?: false
+      val isForced = sub["isForced"] as? Boolean ?: false
+      val selectionFlags =
+        (if (isDefault) C.SELECTION_FLAG_DEFAULT else 0) or
+          (if (isForced) C.SELECTION_FLAG_FORCED else 0)
       val config = MediaItem.SubtitleConfiguration.Builder(Uri.parse(subUri))
         .setId("external_$index")
-        .setLabel(sub["title"] ?: "External")
-        .setLanguage(sub["language"])
-        .setMimeType(sub["mimeType"] ?: detectSubtitleMimeType(subUri))
+        .setLabel(title ?: "External")
+        .setLanguage(language)
+        .setMimeType(mimeType ?: subtitleMimeTypeForCodec(codec) ?: detectSubtitleMimeType(subUri))
+        .setSelectionFlags(selectionFlags)
         .build()
       externalSubtitles.add(config)
       externalSubtitleUris.add(subUri)
@@ -2351,7 +2360,8 @@ class ExoPlayerCore(private val activity: Activity) : Player.Listener {
       reason = "open",
       forceSelector = true,
       clearAudioOverrides = true,
-      clearTextOverrides = true
+      clearTextOverrides = true,
+      textDisabled = true
     )
     emitSeekable(false, force = true)
 
@@ -2618,6 +2628,14 @@ class ExoPlayerCore(private val activity: Activity) : Player.Listener {
     }
   }
 
+  private fun subtitleMimeTypeForCodec(codec: String?): String? = when (codec?.lowercase()) {
+    "srt", "subrip" -> MimeTypes.APPLICATION_SUBRIP
+    "ass", "ssa" -> MimeTypes.TEXT_SSA
+    "webvtt", "vtt" -> MimeTypes.TEXT_VTT
+    "ttml" -> MimeTypes.APPLICATION_TTML
+    else -> null
+  }
+
   fun setVisible(visible: Boolean) {
     if (disposing) return
     currentVisible = visible

android/app/src/main/kotlin/com/edde746/plezy/exoplayer/ExoPlayerPlugin.kt

@@ -240,7 +240,7 @@ class ExoPlayerPlugin :
     val startPositionMs = call.argument<Number>("startPositionMs")?.toLong() ?: 0L
     val autoPlay = call.argument<Boolean>("autoPlay") ?: true
     val isLive = call.argument<Boolean>("isLive") ?: false
-    val externalSubtitles = call.argument<List<Map<String, String?>>>("externalSubtitles")
+    val externalSubtitles = call.argument<List<Map<String, Any?>>>("externalSubtitles")
 
     if (uri == null) {
       result.error("INVALID_ARGS", "Missing 'uri'", null)
@@ -260,6 +260,8 @@ class ExoPlayerPlugin :
         val options = mutableListOf<String>()
         options.add("start=$startSeconds")
         if (!autoPlay) options.add("pause=yes")
+        options.add("sid=no")
+        options.add("secondary-sid=no")
         headers?.forEach { (key, value) ->
           options.add("http-header-fields-append=$key: $value")
         }