Support parsing of sgpd and sbgp boxes

media/formats/mp4/box_reader.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/formats/mp4/box_reader.h"
 
 #include <string.h>
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 165 matching lines @@
     if (!child.ReadHeader(&err)) break;
 
     children_.insert(std::pair<FourCC, BoxReader>(child.type(), child));
     pos_ += child.size();
   }
 
   DCHECK(!err);
   return !err && pos() == size();
 }
 
+bool BoxReader::HasChild(Box* child) {
+  DCHECK(scanned_);
+  DCHECK(child);
+  return children_.count(child->BoxType()) > 0;
+}
+
 bool BoxReader::ReadChild(Box* child) {
   DCHECK(scanned_);
   FourCC child_type = child->BoxType();
 
   ChildMap::iterator itr = children_.find(child_type);
   RCHECK(itr != children_.end());
   DVLOG(2) << "Found a " << FourCCToString(child_type) << " box.";
   RCHECK(child->Parse(&itr->second));
   children_.erase(itr);
   return true;
@@ skipping 37 matching lines @@
   }
 
   // Note that the pos_ head has advanced to the byte immediately after the
   // header, which is where we want it.
   size_ = size;
   return true;
 }
 
 }  // namespace mp4
 }  // namespace media