Add support to identify (E)AC3 streams via TS descriptor tag

library/src/main/java/com/google/android/exoplayer/extractor/ts/TsExtractor.java

@@ -392,7 +392,14 @@ public final class TsExtractor implements Extractor {
             streamType = TS_STREAM_TYPE_H265;
             streamType = TS_STREAM_TYPE_H265;
           }
           }
           break;
           break;
+        } else if (descriptorTag == 0x6a) {
+          streamType = TS_STREAM_TYPE_AC3;
+        } else if (descriptorTag == 0x7a) {
+          streamType = TS_STREAM_TYPE_E_AC3;
+        } else if (descriptorTag == 0x7b) {
+          // TODO: TS_STREAM_TYPE_DTS;
         }
         }
+
         data.skipBytes(descriptorLength);
         data.skipBytes(descriptorLength);
       }
       }
       data.setPosition(descriptorsEndPosition);
       data.setPosition(descriptorsEndPosition);