Bug 1133478: Postpone parsing TRUN atom until we have all dependent atoms. r=k17e

Atoms may be out of order inside MOOF, in particular the TFDT may only be
defined after TRUN.

media/libstagefright/binding/MoofParser.cpp

@@ -301,8 +301,6 @@ Moof::ParseTraf(Box& aBox, Trex& aTrex, Mdhd& aMdhd, Edts& aEdts, Sinf& aSinf)
     } else if (!aTrex.mTrackId || tfhd.mTrackId == aTrex.mTrackId) {
       if (box.IsType("tfdt")) {
         tfdt = Tfdt(box);
-      } else if (box.IsType("trun")) {
-        ParseTrun(box, tfhd, tfdt, aMdhd, aEdts);
       } else if (box.IsType("saiz")) {
         mSaizs.AppendElement(Saiz(box, aSinf.mDefaultEncryptionType));
       } else if (box.IsType("saio")) {
@@ -310,6 +308,18 @@ Moof::ParseTraf(Box& aBox, Trex& aTrex, Mdhd& aMdhd, Edts& aEdts, Sinf& aSinf)
       }
     }
   }
+  if (aTrex.mTrackId && tfhd.mTrackId != aTrex.mTrackId) {
+    return;
+  }
+  // Now search for TRUN box.
+  for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
+    if (box.IsType("trun")) {
+      ParseTrun(box, tfhd, tfdt, aMdhd, aEdts);
+      if (IsValid()) {
+        break;
+      }
+    }
+  }
 }
 
 void