Add support for MP4 H263 atom type

#minor-release
Issue:#9158
PiperOrigin-RevId: 383660258

RELEASENOTES.md

@@ -25,6 +25,8 @@
         is malformed and should be re-encoded.
     *   Improve support for truncated Ogg streams
         ([#7608](https://github.com/google/ExoPlayer/issues/7608)).
+    *   Add support for MP4 H263 atom type
+        ([#9158](https://github.com/google/ExoPlayer/issues/9158)).
 *   HLS:
     *   Fix issue where playback of a live event could become stuck rather than
         transitioning to `STATE_ENDED` when the event ends

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Atom.java

@@ -106,6 +106,8 @@ import java.util.List;
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_s263 = 0x73323633;
 
+  public static final int TYPE_H263 = 0x48323633;
+
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_d263 = 0x64323633;
 

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java

@@ -915,6 +915,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
           || childAtomType == Atom.TYPE_hvc1
           || childAtomType == Atom.TYPE_hev1
           || childAtomType == Atom.TYPE_s263
+          || childAtomType == Atom.TYPE_H263
           || childAtomType == Atom.TYPE_vp08
           || childAtomType == Atom.TYPE_vp09
           || childAtomType == Atom.TYPE_av01
@@ -1056,6 +1057,8 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     @Nullable String mimeType = null;
     if (atomType == Atom.TYPE_m1v_) {
       mimeType = MimeTypes.VIDEO_MPEG;
+    } else if (atomType == Atom.TYPE_H263) {
+      mimeType = MimeTypes.VIDEO_H263;
     }
 
     @Nullable List<byte[]> initializationData = null;