Parse "f800" as channel count of 5 for Dolby in DASH manifest

Issue: androidx/media#688
PiperOrigin-RevId: 581908905

RELEASENOTES.md

@@ -63,6 +63,8 @@
     *   Extend experimental support for parsing subtitles during extraction to
         work with standalone text files (previously it only worked with
         subtitles muxed into MP4 segments).
+    *   Parse "f800" as channel count of 5 for Dolby in DASH manifest
+        ([#688](https://github.com/androidx/media/issues/688)).
 *   Smooth Streaming Extension:
 *   RTSP Extension:
 *   Decoder Extensions (FFmpeg, VP9, AV1, MIDI, etc.):

libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/DashManifestParser.java

@@ -2020,6 +2020,8 @@ public class DashManifestParser extends DefaultHandler
         return 1;
       case "a000":
         return 2;
+      case "f800":
+        return 5;
       case "f801":
         return 6;
       case "fa01":