playback: specify audio extractors only

Only specify audio extractors to reduce APK size.

app/build.gradle

@@ -102,9 +102,7 @@ dependencies {
 
     // --- THIRD PARTY ---
 
-    // Exoplayer
-    // WARNING: THE EXOPLAYER VERSION MUST BE KEPT IN LOCK-STEP WITH THE PRE-BUILD SCRIPT.
-    // IF NOT, VERY UNFRIENDLY BUILD FAILURES AND CRASHES MAY ENSUE.
+    // Exoplayer (Vendored)
     implementation project(":exoplayer-library-core")
     implementation project(":exoplayer-extension-ffmpeg")
 

app/src/main/java/org/oxycblt/auxio/playback/system/PlaybackService.kt

@@ -35,7 +35,14 @@ import com.google.android.exoplayer2.audio.AudioAttributes
 import com.google.android.exoplayer2.audio.AudioCapabilities
 import com.google.android.exoplayer2.audio.MediaCodecAudioRenderer
 import com.google.android.exoplayer2.ext.ffmpeg.FfmpegAudioRenderer
-import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory
+import com.google.android.exoplayer2.extractor.ExtractorsFactory
+import com.google.android.exoplayer2.extractor.flac.FlacExtractor
+import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor
+import com.google.android.exoplayer2.extractor.mp3.Mp3Extractor
+import com.google.android.exoplayer2.extractor.mp4.Mp4Extractor
+import com.google.android.exoplayer2.extractor.ogg.OggExtractor
+import com.google.android.exoplayer2.extractor.ts.AdtsExtractor
+import com.google.android.exoplayer2.extractor.wav.WavExtractor
 import com.google.android.exoplayer2.mediacodec.MediaCodecSelector
 import com.google.android.exoplayer2.source.DefaultMediaSourceFactory
 import dagger.hilt.android.AndroidEntryPoint
@@ -115,8 +122,20 @@ class PlaybackService :
     override fun onCreate() {
         super.onCreate()
 
-        // Enable constant bitrate seeking so that certain MP3s/AACs are seekable
-        val extractorsFactory = DefaultExtractorsFactory().setConstantBitrateSeekingEnabled(true)
+        // Define our own extractors so we can exclude non-audio parsers.
+        // Ordering is derived from the DefaultExtractorsFactory's optimized ordering:
+        // https://docs.google.com/document/d/1w2mKaWMxfz2Ei8-LdxqbPs1VLe_oudB-eryXXw9OvQQ.
+        val extractorsFactory = ExtractorsFactory {
+            arrayOf(
+                FlacExtractor(),
+                WavExtractor(),
+                Mp4Extractor(),
+                OggExtractor(),
+                MatroskaExtractor(),
+                // Enable constant bitrate seeking so that certain MP3s/AACs are seekable
+                AdtsExtractor(AdtsExtractor.FLAG_ENABLE_CONSTANT_BITRATE_SEEKING),
+                Mp3Extractor(Mp3Extractor.FLAG_ENABLE_CONSTANT_BITRATE_SEEKING))
+        }
         // Since Auxio is a music player, only specify an audio renderer to save
         // battery/apk size/cache size
         val audioRenderer = RenderersFactory { handler, _, audioListener, _, _ ->
@@ -170,7 +189,7 @@ class PlaybackService :
     }
 
     override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
-        // Forward system media button sent by MediaButtonReciever to MediaSessionComponent
+        // Forward system media button sent by MediaButtonReceiver to MediaSessionComponent
         if (intent.action == Intent.ACTION_MEDIA_BUTTON) {
             mediaSessionComponent.handleMediaButtonIntent(intent)
         }

gradle.properties

@@ -17,7 +17,5 @@ org.gradle.jvmargs=-Xmx2048m
 android.useAndroidX=true
 # Automatically convert third-party libraries to use AndroidX
 android.enableJetifier=true
-# Stop ExoPlayer AARs from being mangled
-android.enableDexingArtifactTransform=false
 # Kotlin code style for this project: "official" or "obsolete":
 kotlin.code.style=official