[Feature] Filter subtitle using 'preferred media' language

app/src/main/java/com/lagradost/cloudstream3/ui/player/GeneratorPlayer.kt

@@ -1004,12 +1004,25 @@ class GeneratorPlayer : FullScreenPlayer() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+        var langFilterList = listOf<String>()
+        var filterSubByLang = false
 
         context?.let { ctx ->
             val settingsManager = PreferenceManager.getDefaultSharedPreferences(ctx)
             titleRez = settingsManager.getInt(ctx.getString(R.string.prefer_limit_title_rez_key), 3)
             limitTitle = settingsManager.getInt(ctx.getString(R.string.prefer_limit_title_key), 0)
             updateForcedEncoding(ctx)
+
+            filterSubByLang = settingsManager.getBoolean(getString(R.string.filter_sub_lang_key), false)
+            if (filterSubByLang) {
+                val langFromPrefMedia = settingsManager.getStringSet(
+                    this.getString(R.string.provider_lang_key),
+                    mutableSetOf("en")
+                )
+                langFilterList = langFromPrefMedia?.mapNotNull {
+                    fromTwoLettersToLanguage(it)?.lowercase() ?: return@mapNotNull null
+                } ?: listOf()
+            }
         }
 
         unwrapBundle(savedInstanceState)
@@ -1062,7 +1075,18 @@ class GeneratorPlayer : FullScreenPlayer() {
         }
 
         observe(viewModel.currentSubs) { set ->
+            val setOfSub = mutableSetOf<SubtitleData>()
+            if (langFilterList.isNotEmpty() && filterSubByLang) {
+                Log.i("subfilter", "Filtering subtitle")
+                langFilterList.forEach { lang ->
+                    Log.i("subfilter", "Lang: $lang")
+                    setOfSub += set.filter { it.name.contains(lang, ignoreCase = true) }
+                        .toMutableSet()
+                }
+                currentSubs = setOfSub
+            } else {
                 currentSubs = set
+            }
             player.setActiveSubtitles(set)
 
             autoSelectSubtitles()

app/src/main/java/com/lagradost/cloudstream3/ui/subtitles/SubtitlesFragment.kt

@@ -16,6 +16,7 @@ import android.widget.Toast
 import androidx.annotation.FontRes
 import androidx.core.content.res.ResourcesCompat
 import androidx.fragment.app.Fragment
+import androidx.preference.PreferenceManager
 import com.fasterxml.jackson.annotation.JsonProperty
 import com.google.android.exoplayer2.text.Cue
 import com.google.android.exoplayer2.ui.CaptionStyleCompat
@@ -415,6 +416,20 @@ class SubtitlesFragment : Fragment() {
             return@setOnLongClickListener true
         }
 
+        //Fetch current value from preference
+        context?.let { ctx ->
+            subtitles_filter_sub_lang?.isChecked = PreferenceManager.getDefaultSharedPreferences(ctx)
+                .getBoolean(getString(R.string.filter_sub_lang_key), false)
+        }
+        subtitles_filter_sub_lang?.setOnCheckedChangeListener { _, b ->
+            context?.let { ctx ->
+                PreferenceManager.getDefaultSharedPreferences(ctx)
+                    .edit()
+                    .putBoolean(getString(R.string.filter_sub_lang_key), b)
+                    .apply()
+            }
+        }
+
         subs_font.setFocusableInTv()
         subs_font.setOnClickListener { textView ->
             val fontTypes = listOf(

app/src/main/res/layout/subtitle_settings.xml

@@ -169,6 +169,19 @@
                 android:layout_width="match_parent"
                 android:layout_height="match_parent" />
 
+        <com.google.android.material.switchmaterial.SwitchMaterial
+            android:nextFocusUp="@id/subtitles_remove_captions"
+            android:nextFocusDown="@id/apply_btt"
+            android:nextFocusLeft="@id/apply_btt"
+            android:nextFocusRight="@id/cancel_btt"
+            android:fontFamily="@font/google_sans"
+            style="@style/SettingsItem"
+            app:drawableEndCompat="@null"
+            android:id="@+id/subtitles_filter_sub_lang"
+            android:text="@string/subtitles_filter_lang"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
         <TextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"

app/src/main/res/values/strings.xml

@@ -53,6 +53,7 @@
     <string name="subtitles_encoding_key" translatable="false">subtitles_encoding_key</string>
     <string name="override_site_key" translatable="false">override_site_key</string>
     <string name="redo_setup_key" translatable="false">redo_setup_key</string>
+    <string name="filter_sub_lang_key" translatable="false">filter_sub_lang_key</string>
 
     <!-- FORMAT MIGHT TRANSLATE, WILL CAUSE CRASH IF APPLIED WRONG -->
     <string name="extra_info_format" formatted="true" translatable="false">%d %s | %sMB</string>
@@ -561,6 +562,7 @@
     <string name="error">Error</string>
     <string name="subtitles_remove_captions">Remove closed captions from subtitles</string>
     <string name="subtitles_remove_bloat">Remove bloat from subtitles</string>
+    <string name="subtitles_filter_lang">Filter by preferred media language</string>
     <string name="extras">Extras</string>
     <string name="trailer">Trailer</string>
     <string name="network_adress_example">Link to stream</string>