Handle non-standard MIME type on LG AC3 decoder

PiperOrigin-RevId: 437057336

RELEASENOTES.md

@@ -15,6 +15,8 @@
 *   Track selection:
     *   Flatten `TrackSelectionOverrides` class into `TrackSelectionParameters`,
         and promote `TrackSelectionOverride` to a top level class.
+*   Audio:
+    *   Use LG AC3 audio decoder advertising non-standard MIME type.
 *   Extractors:
     *   Matroska: Parse `DiscardPadding` for Opus tracks.
 *   UI:

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/mediacodec/MediaCodecUtil.java

@@ -443,6 +443,8 @@ public final class MediaCodecUtil {
       return "audio/x-lg-alac";
     } else if (mimeType.equals(MimeTypes.AUDIO_FLAC) && "OMX.lge.flac.decoder".equals(name)) {
       return "audio/x-lg-flac";
+    } else if (mimeType.equals(MimeTypes.AUDIO_AC3) && "OMX.lge.ac3.decoder".equals(name)) {
+      return "audio/lg-ac3";
     }
 
     return null;