feat: translate subtitles with an OpenAI-compatible LLM

src/qml/PlayerPage.qml

@@ -10,8 +10,10 @@ Kirigami.Page {
 
     property url initialUrl
     readonly property alias mediaTitle: mpv.mediaTitle
+    readonly property alias translator: translator
 
     signal aboutRequested()
+    signal settingsRequested()
     signal fullScreenToggled()
 
     title: KI18n.i18nc("@title", "Player")
@@ -31,6 +33,13 @@ Kirigami.Page {
             shortcut: "F"
             onTriggered: page.fullScreenToggled()
         },
+        Kirigami.Action {
+            icon.name: "configure"
+            text: KI18n.i18nc("@action", "Settings")
+            displayHint: Kirigami.DisplayHint.AlwaysHide
+            shortcut: StandardKey.Preferences
+            onTriggered: page.settingsRequested()
+        },
         Kirigami.Action {
             icon.name: "help-about"
             text: KI18n.i18nc("@action", "About QtPotato")
@@ -83,6 +92,25 @@ Kirigami.Page {
         mpv.showText(KI18n.i18nc("@info:osd", "Subtitle delay: %1 ms", Math.round(delay * 1000)))
     }
 
+    TranslationService {
+        id: translator
+        onTranslated: (subtitleUrl, fromCache) => {
+            mpv.showSecondarySubtitleFile(subtitleUrl,
+                KI18n.i18nc("@item:inlistbox subtitle track, %1 is a language", "%1 (translated)", QtPotatoSettings.targetLanguage))
+            mpv.showText(fromCache
+                ? KI18n.i18nc("@info:osd", "Loaded the saved translation")
+                : KI18n.i18nc("@info:osd", "Translation ready"))
+        }
+    }
+
+    Connections {
+        target: mpv
+        // A translation belongs to the file it was started for.
+        function onCurrentUrlChanged() {
+            translator.cancel()
+        }
+    }
+
     function isSubtitleFile(url: url): bool {
         return /\.(srt|ass|ssa|vtt|sub|sup)$/i.test(url.toString())
     }
@@ -212,6 +240,8 @@ Kirigami.Page {
                         id: subtitlePopup
                         objectName: "subtitlePopup"
                         mpv: mpv
+                        translator: translator
+                        onSettingsRequested: page.settingsRequested()
                         x: subtitleButton.width - width
                         y: -height - Kirigami.Units.smallSpacing
                     }