playback: add fragmented mp4 extractor

Not adding this broke MP4-AAC files for some insane reason. Google devs
try not to maintain two near-identical products with only slightly
infuriating differences challenge (IMPOSSIBLE)

Resolves #388.

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## dev
 
+#### What's Fixed
+- Fixed MP4-AAC files not playing due to an accidental audio extractor
+deletion
+
 #### What's Improved
 - Accept `REPLAYGAIN_*` adjustment information on OPUS files alongside
 `R128_*` adjustments.

app/src/main/java/org/oxycblt/auxio/music/AudioOnlyExtractors.kt

@@ -21,6 +21,7 @@ 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.FragmentedMp4Extractor
 import com.google.android.exoplayer2.extractor.mp4.Mp4Extractor
 import com.google.android.exoplayer2.extractor.ogg.OggExtractor
 import com.google.android.exoplayer2.extractor.ts.AdtsExtractor
@@ -36,6 +37,7 @@ object AudioOnlyExtractors : ExtractorsFactory {
         arrayOf(
             FlacExtractor(),
             WavExtractor(),
+            FragmentedMp4Extractor(),
             Mp4Extractor(),
             OggExtractor(),
             MatroskaExtractor(),