Integrate with libass-android to support SSA/ASS subtitles in ExoPlayer (#1052)

## Description
Add better ASS/SSA support to ExoPlayer by using
[`libass-android`](https://github.com/peerless2012/libass-android).

This is enabled with the "Use libass for ASS subtitles" advanced
settings for ExoPlayer. It is enabled by default.

### Related issues
Related to #22
Replaces reverted #569
Fixes #1107

app/build.gradle.kts

@@ -171,6 +171,12 @@ android {
             isUniversalApk = true
         }
     }
+    packaging {
+        jniLibs {
+            // Work around because libass-android & wholphin-mpv both (incorrectly) package libc++_shared.so
+            pickFirsts += "lib/*/libc++_shared.so"
+        }
+    }
 
     sourceSets {
         getByName("main") {
@@ -269,6 +275,7 @@ dependencies {
     implementation(libs.androidx.media3.exoplayer.dash)
     implementation(libs.androidx.media3.ui)
     implementation(libs.androidx.media3.ui.compose)
+    implementation(libs.ass.media)
 
     implementation(libs.coil.core)
     implementation(libs.coil.compose)

app/src/main/java/com/github/damontecres/wholphin/preferences/AppPreference.kt

@@ -431,16 +431,18 @@ sealed interface AppPreference<Pref, T> {
                 summaryOn = R.string.enabled,
                 summaryOff = R.string.disabled,
             )
-        val DirectPlayAss =
-            AppSwitchPreference<AppPreferences>(
-                title = R.string.direct_play_ass,
-                defaultValue = true,
-                getter = { it.playbackPreferences.overrides.directPlayAss },
+        val AssSubtitleMode =
+            AppChoicePreference<AppPreferences, AssPlaybackMode>(
+                title = R.string.ass_subtitle_playback,
+                defaultValue = AssPlaybackMode.ASS_LIBASS,
+                getter = { it.playbackPreferences.overrides.assPlaybackMode },
                 setter = { prefs, value ->
-                    prefs.updatePlaybackOverrides { directPlayAss = value }
+                    prefs.updatePlaybackOverrides { assPlaybackMode = value }
                 },
-                summaryOn = R.string.enabled,
-                summaryOff = R.string.disabled,
+                displayValues = R.array.ass_subtitle_modes,
+                subtitles = R.array.ass_subtitle_modes_summary,
+                indexToValue = { AssPlaybackMode.forNumber(it) },
+                valueToIndex = { if (it != AssPlaybackMode.UNRECOGNIZED) it.number else AssPlaybackMode.ASS_LIBASS.number },
             )
         val DirectPlayPgs =
             AppSwitchPreference<AppPreferences>(
@@ -1100,7 +1102,7 @@ private val ExoPlayerSettings =
         AppPreference.FfmpegPreference,
         AppPreference.DownMixStereo,
         AppPreference.Ac3Supported,
-        AppPreference.DirectPlayAss,
+        AppPreference.AssSubtitleMode,
         AppPreference.DirectPlayPgs,
         AppPreference.DirectPlayDoviProfile7,
         AppPreference.DecodeAv1,

app/src/main/java/com/github/damontecres/wholphin/preferences/AppPreferencesSerializer.kt

@@ -61,10 +61,11 @@ class AppPreferencesSerializer
                                         .apply {
                                             ac3Supported = AppPreference.Ac3Supported.defaultValue
                                             downmixStereo = AppPreference.DownMixStereo.defaultValue
-                                            directPlayAss = AppPreference.DirectPlayAss.defaultValue
+//                                            directPlayAss = AppPreference.DirectPlayAss.defaultValue
                                             directPlayPgs = AppPreference.DirectPlayPgs.defaultValue
                                             mediaExtensionsEnabled =
                                                 AppPreference.FfmpegPreference.defaultValue
+                                            assPlaybackMode = AppPreference.AssSubtitleMode.defaultValue
                                         }.build()
 
                                 mpvOptions =

app/src/main/java/com/github/damontecres/wholphin/services/AppUpgradeHandler.kt

@@ -141,7 +141,7 @@ class AppUpgradeHandler
                     it.updatePlaybackOverrides {
                         ac3Supported = AppPreference.Ac3Supported.defaultValue
                         downmixStereo = AppPreference.DownMixStereo.defaultValue
-                        directPlayAss = AppPreference.DirectPlayAss.defaultValue
+//                        directPlayAss = AppPreference.DirectPlayAss.defaultValue
                         directPlayPgs = AppPreference.DirectPlayPgs.defaultValue
                     }
                 }
@@ -319,5 +319,13 @@ class AppUpgradeHandler
                     }
                 }
             }
+
+            if (previous.isEqualOrBefore(Version.fromString("0.6.2-1-g0"))) {
+                appPreferences.updateData {
+                    it.updatePlaybackOverrides {
+                        assPlaybackMode = AppPreference.AssSubtitleMode.defaultValue
+                    }
+                }
+            }
         }
     }

app/src/main/java/com/github/damontecres/wholphin/services/DeviceProfileService.kt

@@ -1,6 +1,7 @@
 package com.github.damontecres.wholphin.services
 
 import android.content.Context
+import com.github.damontecres.wholphin.preferences.AssPlaybackMode
 import com.github.damontecres.wholphin.preferences.PlaybackPreferences
 import com.github.damontecres.wholphin.util.profile.MediaCodecCapabilitiesTest
 import com.github.damontecres.wholphin.util.profile.createDeviceProfile
@@ -43,7 +44,7 @@ class DeviceProfileService
                             maxBitrate = prefs.maxBitrate.toInt(),
                             isAC3Enabled = prefs.overrides.ac3Supported,
                             downMixAudio = prefs.overrides.downmixStereo,
-                            assDirectPlay = prefs.overrides.directPlayAss,
+                            assPlaybackMode = prefs.overrides.assPlaybackMode,
                             pgsDirectPlay = prefs.overrides.directPlayPgs,
                             dolbyVisionELDirectPlay = prefs.overrides.directPlayDolbyVisionEL,
                             decodeAv1 = prefs.overrides.decodeAv1,
@@ -58,7 +59,7 @@ class DeviceProfileService
                                 maxBitrate = newConfig.maxBitrate,
                                 isAC3Enabled = newConfig.isAC3Enabled,
                                 downMixAudio = newConfig.downMixAudio,
-                                assDirectPlay = newConfig.assDirectPlay,
+                                assDirectPlay = newConfig.assPlaybackMode != AssPlaybackMode.ASS_TRANSCODE,
                                 pgsDirectPlay = newConfig.pgsDirectPlay,
                                 dolbyVisionELDirectPlay = newConfig.dolbyVisionELDirectPlay,
                                 decodeAv1 = prefs.overrides.decodeAv1,
@@ -77,7 +78,7 @@ data class DeviceProfileConfiguration(
     val maxBitrate: Int,
     val isAC3Enabled: Boolean,
     val downMixAudio: Boolean,
-    val assDirectPlay: Boolean,
+    val assPlaybackMode: AssPlaybackMode,
     val pgsDirectPlay: Boolean,
     val dolbyVisionELDirectPlay: Boolean,
     val decodeAv1: Boolean,

app/src/main/java/com/github/damontecres/wholphin/services/PlayerFactory.kt

@@ -10,22 +10,29 @@ import androidx.datastore.core.DataStore
 import androidx.media3.common.C
 import androidx.media3.common.Player
 import androidx.media3.common.util.UnstableApi
+import androidx.media3.datasource.DefaultDataSource
 import androidx.media3.exoplayer.DefaultRenderersFactory
 import androidx.media3.exoplayer.ExoPlayer
 import androidx.media3.exoplayer.Renderer
+import androidx.media3.exoplayer.RenderersFactory
 import androidx.media3.exoplayer.mediacodec.MediaCodecSelector
+import androidx.media3.exoplayer.source.DefaultMediaSourceFactory
 import androidx.media3.exoplayer.video.MediaCodecVideoRenderer
 import androidx.media3.exoplayer.video.VideoRendererEventListener
-import com.github.damontecres.wholphin.preferences.AppPreference
+import androidx.media3.extractor.DefaultExtractorsFactory
 import com.github.damontecres.wholphin.preferences.AppPreferences
+import com.github.damontecres.wholphin.preferences.AssPlaybackMode
 import com.github.damontecres.wholphin.preferences.MediaExtensionStatus
 import com.github.damontecres.wholphin.preferences.PlaybackPreferences
 import com.github.damontecres.wholphin.preferences.PlayerBackend
 import com.github.damontecres.wholphin.util.mpv.MpvPlayer
 import dagger.hilt.android.qualifiers.ApplicationContext
+import io.github.peerless2012.ass.media.AssHandler
+import io.github.peerless2012.ass.media.factory.AssRenderersFactory
+import io.github.peerless2012.ass.media.kt.withAssMkvSupport
+import io.github.peerless2012.ass.media.parser.AssSubtitleParserFactory
+import io.github.peerless2012.ass.media.type.AssRenderType
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.firstOrNull
-import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 import timber.log.Timber
 import java.lang.reflect.Constructor
@@ -46,71 +53,17 @@ class PlayerFactory
         var currentPlayer: Player? = null
             private set
 
-        fun createVideoPlayer(): Player {
-            if (currentPlayer?.isReleased == false) {
-                Timber.w("Player was not released before trying to create a new one!")
-                currentPlayer?.release()
-            }
-
-            val prefs = runBlocking { appPreferences.data.firstOrNull()?.playbackPreferences }
-            val backend = prefs?.playerBackend ?: AppPreference.PlayerBackendPref.defaultValue
-            val newPlayer =
-                when (backend) {
-                    PlayerBackend.PREFER_MPV,
-                    PlayerBackend.MPV,
-                    -> {
-                        val enableHardwareDecoding =
-                            prefs?.mpvOptions?.enableHardwareDecoding
-                                ?: AppPreference.MpvHardwareDecoding.defaultValue
-                        val useGpuNext =
-                            prefs?.mpvOptions?.useGpuNext
-                                ?: AppPreference.MpvGpuNext.defaultValue
-                        MpvPlayer(context, enableHardwareDecoding, useGpuNext)
-                            .apply {
-                                playWhenReady = true
-                            }
-                    }
-
-                    PlayerBackend.EXO_PLAYER,
-                    PlayerBackend.UNRECOGNIZED,
-                    -> {
-                        val extensions = prefs?.overrides?.mediaExtensionsEnabled
-                        val decodeAv1 = prefs?.overrides?.decodeAv1 == true
-                        Timber.v("extensions=$extensions")
-                        val rendererMode =
-                            when (extensions) {
-                                MediaExtensionStatus.MES_FALLBACK -> DefaultRenderersFactory.EXTENSION_RENDERER_MODE_ON
-                                MediaExtensionStatus.MES_PREFERRED -> DefaultRenderersFactory.EXTENSION_RENDERER_MODE_PREFER
-                                MediaExtensionStatus.MES_DISABLED -> DefaultRenderersFactory.EXTENSION_RENDERER_MODE_OFF
-                                else -> DefaultRenderersFactory.EXTENSION_RENDERER_MODE_ON
-                            }
-                        ExoPlayer
-                            .Builder(context)
-                            .setRenderersFactory(
-                                WholphinRenderersFactory(context, decodeAv1)
-                                    .setEnableDecoderFallback(true)
-                                    .setExtensionRendererMode(rendererMode),
-                            ).build()
-                            .apply {
-                                playWhenReady = true
-                            }
-                    }
-                }
-            currentPlayer = newPlayer
-            return newPlayer
-        }
-
         suspend fun createVideoPlayer(
             backend: PlayerBackend,
             prefs: PlaybackPreferences,
-        ): Player {
+        ): PlayerCreation {
             withContext(Dispatchers.Main) {
                 if (currentPlayer?.isReleased == false) {
                     Timber.w("Player was not released before trying to create a new one!")
                     currentPlayer?.release()
                 }
             }
-
+            var assHandler: AssHandler? = null
             val newPlayer =
                 when (backend) {
                     PlayerBackend.PREFER_MPV,
@@ -125,8 +78,14 @@ class PlayerFactory
                     PlayerBackend.UNRECOGNIZED,
                     -> {
                         val extensions = prefs.overrides.mediaExtensionsEnabled
+                        val useLibAss =
+                            prefs.overrides.assPlaybackMode == AssPlaybackMode.ASS_LIBASS
                         val decodeAv1 = prefs.overrides.decodeAv1
-                        Timber.v("extensions=$extensions")
+                        Timber.v(
+                            "extensions=%s, assPlaybackMode=%s",
+                            extensions,
+                            prefs.overrides.assPlaybackMode,
+                        )
                         val rendererMode =
                             when (extensions) {
                                 MediaExtensionStatus.MES_FALLBACK -> DefaultRenderersFactory.EXTENSION_RENDERER_MODE_ON
@@ -134,17 +93,42 @@ class PlayerFactory
                                 MediaExtensionStatus.MES_DISABLED -> DefaultRenderersFactory.EXTENSION_RENDERER_MODE_OFF
                                 else -> DefaultRenderersFactory.EXTENSION_RENDERER_MODE_ON
                             }
-                        ExoPlayer
-                            .Builder(context)
-                            .setRenderersFactory(
+                        val dataSourceFactory = DefaultDataSource.Factory(context)
+                        val extractorsFactory = DefaultExtractorsFactory()
+                        var renderersFactory: RenderersFactory =
                             WholphinRenderersFactory(context, decodeAv1)
                                 .setEnableDecoderFallback(true)
-                                    .setExtensionRendererMode(rendererMode),
-                            ).build()
+                                .setExtensionRendererMode(rendererMode)
+                        val mediaSourceFactory =
+                            if (useLibAss) {
+                                assHandler = AssHandler(AssRenderType.OVERLAY_OPEN_GL)
+                                val assSubtitleParserFactory = AssSubtitleParserFactory(assHandler)
+                                renderersFactory = AssRenderersFactory(assHandler, renderersFactory)
+                                DefaultMediaSourceFactory(
+                                    dataSourceFactory,
+                                    extractorsFactory.withAssMkvSupport(
+                                        assSubtitleParserFactory,
+                                        assHandler,
+                                    ),
+                                ).setSubtitleParserFactory(assSubtitleParserFactory)
+                            } else {
+                                DefaultMediaSourceFactory(
+                                    dataSourceFactory,
+                                    extractorsFactory,
+                                )
+                            }
+                        ExoPlayer
+                            .Builder(context)
+                            .setMediaSourceFactory(mediaSourceFactory)
+                            .setRenderersFactory(renderersFactory)
+                            .build()
+                            .apply {
+                                assHandler?.init(this)
+                            }
                     }
                 }
             currentPlayer = newPlayer
-            return newPlayer
+            return PlayerCreation(newPlayer, assHandler)
         }
     }
 
@@ -157,6 +141,11 @@ val Player.isReleased: Boolean
         }
     }
 
+data class PlayerCreation(
+    val player: Player,
+    val assHandler: AssHandler? = null,
+)
+
 // Code is adapted from https://github.com/androidx/media/blob/release/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/DefaultRenderersFactory.java#L436
 class WholphinRenderersFactory(
     context: Context,

app/src/main/java/com/github/damontecres/wholphin/ui/playback/PlaybackPage.kt

@@ -1,5 +1,8 @@
 package com.github.damontecres.wholphin.ui.playback
 
+import android.view.Gravity
+import android.view.ViewGroup
+import android.widget.FrameLayout
 import androidx.activity.compose.BackHandler
 import androidx.annotation.Dimension
 import androidx.annotation.OptIn
@@ -40,16 +43,18 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.RectangleShape
 import androidx.compose.ui.input.key.onKeyEvent
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.layout.onSizeChanged
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.intl.Locale
+import androidx.compose.ui.unit.IntSize
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.compose.ui.window.Dialog
 import androidx.compose.ui.window.DialogProperties
+import androidx.core.view.children
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.LifecycleStartEffect
-import androidx.media3.common.Player
 import androidx.media3.common.util.UnstableApi
 import androidx.media3.ui.SubtitleView
 import androidx.media3.ui.compose.PlayerSurface
@@ -61,6 +66,7 @@ import androidx.tv.material3.MaterialTheme
 import androidx.tv.material3.surfaceColorAtElevation
 import com.github.damontecres.wholphin.data.model.ItemPlayback
 import com.github.damontecres.wholphin.data.model.Playlist
+import com.github.damontecres.wholphin.preferences.AssPlaybackMode
 import com.github.damontecres.wholphin.preferences.PlayerBackend
 import com.github.damontecres.wholphin.preferences.UserPreferences
 import com.github.damontecres.wholphin.preferences.skipBackOnResume
@@ -79,6 +85,7 @@ import com.github.damontecres.wholphin.util.ExceptionHandler
 import com.github.damontecres.wholphin.util.LoadingState
 import com.github.damontecres.wholphin.util.Media3SubtitleOverride
 import com.github.damontecres.wholphin.util.mpv.MpvPlayer
+import io.github.peerless2012.ass.media.widget.AssSubtitleView
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
@@ -123,8 +130,7 @@ fun PlaybackPage(
         LoadingState.Success -> {
             val playerState by viewModel.currentPlayer.collectAsState()
             PlaybackPageContent(
-                player = playerState!!.player,
-                playerBackend = playerState!!.backend,
+                playerState = playerState!!,
                 preferences = preferences,
                 destination = destination,
                 viewModel = viewModel,
@@ -137,13 +143,15 @@ fun PlaybackPage(
 @OptIn(UnstableApi::class)
 @Composable
 fun PlaybackPageContent(
-    player: Player,
-    playerBackend: PlayerBackend,
+    playerState: PlayerState,
     preferences: UserPreferences,
     destination: Destination,
     modifier: Modifier = Modifier,
     viewModel: PlaybackViewModel,
 ) {
+    val player = playerState.player
+    val playerBackend = playerState.backend
+
     val prefs = preferences.appPreferences.playbackPreferences
     val scope = rememberCoroutineScope()
     val configuration = LocalConfiguration.current
@@ -316,10 +324,14 @@ fun PlaybackPageContent(
                     .focusRequester(focusRequester)
                     .focusable(),
         ) {
+            var playerSurfaceSize by remember { mutableStateOf(IntSize.Zero) }
             PlayerSurface(
                 player = player,
                 surfaceType = SURFACE_TYPE_SURFACE_VIEW,
-                modifier = scaledModifier,
+                modifier =
+                    scaledModifier.onSizeChanged {
+                        playerSurfaceSize = it
+                    },
             )
             if (presentationState.coverSurface) {
                 Box(
@@ -415,7 +427,7 @@ fun PlaybackPageContent(
                 remember(subtitleSettings) { subtitleSettings.imageSubtitleOpacity / 100f }
 
             // Subtitles
-            if (skipIndicatorDuration == 0L && currentItemPlayback.subtitleIndexEnabled) {
+            if (skipIndicatorDuration == 0L && currentItemPlayback.subtitleIndexEnabled && !presentationState.coverSurface) {
                 val maxSize by animateFloatAsState(if (controllerViewState.controlsVisible) .7f else 1f)
                 val isImageSubtitles = remember(cues) { cues.firstOrNull()?.bitmap != null }
                 AndroidView(
@@ -426,12 +438,42 @@ fun PlaybackPageContent(
                                 setFixedTextSize(Dimension.SP, it.fontSize.toFloat())
                                 setBottomPaddingFraction(it.margin.toFloat() / 100f)
                             }
+                            playerState.assHandler?.let { assHandler ->
+                                if (prefs.overrides.assPlaybackMode == AssPlaybackMode.ASS_LIBASS) {
+                                    Timber.v("Adding AssSubtitleView")
+                                    addView(
+                                        AssSubtitleView(context, assHandler).apply {
+                                            layoutParams =
+                                                FrameLayout
+                                                    .LayoutParams(
+                                                        ViewGroup.LayoutParams.MATCH_PARENT,
+                                                        ViewGroup.LayoutParams.MATCH_PARENT,
+                                                    ).apply { gravity = Gravity.CENTER }
+                                        },
+                                    )
+                                }
+                            }
                         }
                     },
                     update = {
                         it.setCues(cues)
                         Media3SubtitleOverride(subtitleSettings.calculateEdgeSize(density))
                             .apply(it)
+                        it.children.firstOrNull { it is AssSubtitleView }?.let {
+                            (it as? AssSubtitleView)?.apply {
+                                val resized =
+                                    layoutParams.let { it.width != playerSurfaceSize.width || it.height != playerSurfaceSize.height }
+                                if (resized) {
+                                    Timber.v("Resizing AssSubtitleView: $playerSurfaceSize")
+                                    layoutParams =
+                                        FrameLayout
+                                            .LayoutParams(
+                                                playerSurfaceSize.width,
+                                                playerSurfaceSize.height,
+                                            ).apply { gravity = Gravity.CENTER }
+                                }
+                            }
+                        }
                     },
                     onReset = {
                         it.setCues(null)

app/src/main/java/com/github/damontecres/wholphin/ui/playback/PlaybackViewModel.kt

@@ -75,6 +75,7 @@ import dagger.assisted.AssistedFactory
 import dagger.assisted.AssistedInject
 import dagger.hilt.android.lifecycle.HiltViewModel
 import dagger.hilt.android.qualifiers.ApplicationContext
+import io.github.peerless2012.ass.media.AssHandler
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
@@ -221,7 +222,8 @@ class PlaybackViewModel
             isHdr: Boolean,
             is4k: Boolean,
         ) {
-            val softwareDecoding = !preferences.appPreferences.playbackPreferences.mpvOptions.enableHardwareDecoding
+            val softwareDecoding =
+                !preferences.appPreferences.playbackPreferences.mpvOptions.enableHardwareDecoding
             val playerBackend =
                 when (preferences.appPreferences.playbackPreferences.playerBackend) {
                     PlayerBackend.UNRECOGNIZED,
@@ -240,13 +242,14 @@ class PlaybackViewModel
                     disconnectPlayer()
                 }
 
-                player =
+                val playerCreation =
                     playerFactory.createVideoPlayer(
                         playerBackend,
                         preferences.appPreferences.playbackPreferences,
                     )
+                this.player = playerCreation.player
                 currentPlayer.update {
-                    PlayerState(player, playerBackend)
+                    PlayerState(playerCreation.player, playerBackend, playerCreation.assHandler)
                 }
                 configurePlayer()
             }
@@ -1450,6 +1453,7 @@ class PlaybackViewModel
 data class PlayerState(
     val player: Player,
     val backend: PlayerBackend,
+    val assHandler: AssHandler?,
 )
 
 data class MediaSegmentState(

app/src/main/java/com/github/damontecres/wholphin/ui/slideshow/SlideshowPage.kt

@@ -69,6 +69,7 @@ import com.github.damontecres.wholphin.ui.playback.isDirectionalDpad
 import com.github.damontecres.wholphin.ui.playback.isDpad
 import com.github.damontecres.wholphin.ui.playback.isEnterKey
 import com.github.damontecres.wholphin.ui.tryRequestFocus
+import com.github.damontecres.wholphin.util.LoadingState
 import org.jellyfin.sdk.model.api.MediaType
 import timber.log.Timber
 import kotlin.math.abs
@@ -92,7 +93,20 @@ fun SlideshowPage(
         ),
 ) {
     val context = LocalContext.current
+    val loading by viewModel.loading.collectAsState()
 
+    when (val st = loading) {
+        is LoadingState.Error -> {
+            ErrorMessage(st, modifier)
+        }
+
+        LoadingState.Loading,
+        LoadingState.Pending,
+        -> {
+            LoadingPage(modifier)
+        }
+
+        LoadingState.Success -> {
             val loadingState by viewModel.loadingState.observeAsState(ImageLoadingState.Loading)
             val imageFilter by viewModel.imageFilter.observeAsState(VideoFilter())
             val position by viewModel.position.observeAsState(0)
@@ -389,15 +403,15 @@ fun SlideshowPage(
                                                 )
                                             }
 
-                                    transformOrigin = TransformOrigin(xTransform, yTransform)
+                                            transformOrigin =
+                                                TransformOrigin(xTransform, yTransform)
                                         }.rotate(rotateAnimation),
                                 model =
                                     ImageRequest
                                         .Builder(LocalContext.current)
                                         .data(imageState.url)
-                                .apply {
-                                    if (isZoomed) size(Size.ORIGINAL)
-                                }.transitionFactory(CrossFadeFactory(750.milliseconds))
+                                        .size(Size.ORIGINAL)
+                                        .transitionFactory(CrossFadeFactory(750.milliseconds))
                                         .useExistingImageAsPlaceholder(true)
                                         .build(),
                                 contentDescription = null,
@@ -492,3 +506,5 @@ fun SlideshowPage(
                 }
             }
         }
+    }
+}

app/src/main/java/com/github/damontecres/wholphin/ui/slideshow/SlideshowViewModel.kt

@@ -16,6 +16,7 @@ import com.github.damontecres.wholphin.data.model.BaseItem
 import com.github.damontecres.wholphin.data.model.PlaybackEffect
 import com.github.damontecres.wholphin.data.model.VideoFilter
 import com.github.damontecres.wholphin.preferences.AppPreference
+import com.github.damontecres.wholphin.preferences.PlayerBackend
 import com.github.damontecres.wholphin.services.ImageUrlService
 import com.github.damontecres.wholphin.services.PlayerFactory
 import com.github.damontecres.wholphin.services.ScreensaverService
@@ -30,6 +31,7 @@ import com.github.damontecres.wholphin.ui.util.ThrottledLiveData
 import com.github.damontecres.wholphin.util.ApiRequestPager
 import com.github.damontecres.wholphin.util.ExceptionHandler
 import com.github.damontecres.wholphin.util.GetItemsRequestHandler
+import com.github.damontecres.wholphin.util.LoadingState
 import dagger.assisted.Assisted
 import dagger.assisted.AssistedFactory
 import dagger.assisted.AssistedInject
@@ -77,9 +79,8 @@ class SlideshowViewModel
             fun create(slideshow: Destination.Slideshow): SlideshowViewModel
         }
 
-        val player by lazy {
-            playerFactory.createVideoPlayer()
-        }
+        lateinit var player: Player
+            private set
 
         private var saveFilters = true
 
@@ -96,7 +97,6 @@ class SlideshowViewModel
 
         var slideshowDelay by Delegates.notNull<Long>()
 
-        //        private val album = MutableLiveData<BaseItem>()
         private val _pager = MutableLiveData<ApiRequestPager<GetItemsRequest>>()
         val pager: LiveData<List<BaseItem?>> = _pager.map { it }
         val position = MutableLiveData(0)
@@ -104,6 +104,8 @@ class SlideshowViewModel
         private val _image = MutableLiveData<ImageState>()
         val image: LiveData<ImageState> = _image
 
+        val loading = MutableStateFlow<LoadingState>(LoadingState.Pending)
+
         val loadingState = MutableLiveData<ImageLoadingState>(ImageLoadingState.Loading)
         private val _imageFilter = MutableLiveData(VideoFilter())
         val imageFilter = ThrottledLiveData(_imageFilter, 500L)
@@ -113,22 +115,26 @@ class SlideshowViewModel
         init {
             addCloseable {
                 screensaverService.keepScreenOn(false)
+                if (this@SlideshowViewModel::player.isInitialized) {
                     player.removeListener(this@SlideshowViewModel)
                     player.release()
                 }
-            player.addListener(this@SlideshowViewModel)
+            }
             viewModelScope.launchIO {
-                val photoPrefs = userPreferencesService.getCurrent().appPreferences.photoPreferences
+                try {
+                    val appPreferences = userPreferencesService.getCurrent().appPreferences
+                    val playerCreation =
+                        playerFactory.createVideoPlayer(
+                            backend = PlayerBackend.EXO_PLAYER,
+                            appPreferences.playbackPreferences,
+                        )
+                    player = playerCreation.player
+                    player.addListener(this@SlideshowViewModel)
+
+                    val photoPrefs = appPreferences.photoPreferences
                     slideshowDelay =
                         photoPrefs.slideshowDuration.takeIf { it >= AppPreference.SlideshowDuration.min }
                             ?: AppPreference.SlideshowDuration.defaultValue
-//                val album =
-//                    api.userLibraryApi
-//                        .getItem(
-//                            itemId = slideshowSettings.parentId,
-//                        ).content
-//                        .let { BaseItem(it, false) }
-//                this@SlideshowViewModel.album.setValueOnMain(album)
                     val includeItemTypes =
                         if (photoPrefs.slideshowPlayVideos) {
                             listOf(BaseItemKind.PHOTO, BaseItemKind.VIDEO)
@@ -163,8 +169,13 @@ class SlideshowViewModel
                         ApiRequestPager(api, request, GetItemsRequestHandler, viewModelScope)
                             .init(slideshowSettings.index)
                     this@SlideshowViewModel._pager.setValueOnMain(pager)
+                    loading.update { LoadingState.Success }
                     updatePosition(slideshowSettings.index)?.join()
                     if (slideshowSettings.startSlideshow) onMain { startSlideshow() }
+                } catch (ex: Exception) {
+                    Timber.e(ex, "Error")
+                    loading.update { LoadingState.Error(ex) }
+                }
             }
         }
 

app/src/main/proto/WholphinDataStore.proto

@@ -40,14 +40,21 @@ message MpvOptions{
   bool use_gpu_next = 2;
 }
 
+enum AssPlaybackMode{
+  ASS_LIBASS = 0;
+  ASS_EXO_PLAYER = 1;
+  ASS_TRANSCODE = 2;
+}
+
 message PlaybackOverrides{
   bool ac3_supported = 1;
   bool downmix_stereo = 2;
-  bool direct_play_ass = 3;
+  bool direct_play_ass = 3 [deprecated = true];
   bool direct_play_pgs = 4;
   MediaExtensionStatus media_extensions_enabled = 5;
   bool direct_play_dolby_vision_e_l = 6;
   bool decode_av1 = 7;
+  AssPlaybackMode ass_playback_mode = 8;
 }
 
 message PlaybackPreferences {

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

@@ -312,7 +312,7 @@
     <string name="check_for_updates">Check for updates</string>
     <string name="combine_continue_next_summary">Applies to TV Series only</string>
     <string name="combine_continue_next"><![CDATA[Combine Continue Watching & Next Up]]></string>
-    <string name="direct_play_ass">Direct play ASS subtitles</string>
+    <string name="direct_play_ass">Use libass for ASS subtitles</string>
     <string name="direct_play_pgs">Direct play PGS subtitles</string>
     <string name="downmix_stereo">Always downmix to stereo</string>
     <string name="ffmpeg_extension_pref">Use FFmpeg decoder module</string>
@@ -757,4 +757,18 @@
     <string name="discover_movies">Discover Movies</string>
     <string name="studios_in">Studios in %1$s</string>
 
+    <string name="ass_subtitle_mode_libass">Direct play with libass</string>
+    <string name="ass_subtitle_mode_exoplayer">Direct play with ExoPlayer built-in</string>
+    <string name="ass_subtitle_mode_transcode">Burn in/transcode on server</string>
+    <string name="ass_subtitle_playback">SSA/ASS subtitle playback</string>
+    <array name="ass_subtitle_modes">
+        <item>@string/ass_subtitle_mode_libass</item>
+        <item>@string/ass_subtitle_mode_exoplayer</item>
+        <item>@string/ass_subtitle_mode_transcode</item>
+    </array>
+    <array name="ass_subtitle_modes_summary">
+        <item>@string/default_track</item>
+        <item></item><!-- Intentionally blank -->
+        <item></item><!-- Intentionally blank -->
+    </array>
 </resources>

gradle/libs.versions.toml

@@ -40,6 +40,7 @@ preferenceKtx = "1.2.1"
 tvprovider = "1.1.0"
 workRuntimeKtx = "2.11.2"
 paletteKtx = "1.0.0"
+assMedia = "0.4.0"
 kotlinxCoroutinesTest = "1.10.2"
 coreTesting = "2.2.0"
 openapi-generator = "7.21.0"
@@ -139,6 +140,8 @@ kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-t
 androidx-core-testing = { module = "androidx.arch.core:core-testing", version.ref = "coreTesting" }
 androidx-runner = { group = "androidx.test", name = "runner", version.ref = "runner" }
 
+ass-media = { group = "io.github.peerless2012", name = "ass-media", version.ref = "assMedia" }
+
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }