libwebm: added BlockEntry::GetKind op

Change-Id: I7d7daac0d3b8be1b8839f96503250170f675e34d

mkvparser.cpp

@@ -5145,11 +5145,18 @@ long Track::GetNext(
 }
 
 
-Track::EOSBlock::EOSBlock() : BlockEntry(NULL, LONG_MIN)
+Track::EOSBlock::EOSBlock() :
+    BlockEntry(NULL, LONG_MIN)
 {
 }
 
 
+BlockEntry::Kind Track::EOSBlock::GetKind() const
+{
+    return kBlockEOS;
+}
+
+
 const Block* Track::EOSBlock::GetBlock() const
 {
     return NULL;
@@ -7802,6 +7809,12 @@ SimpleBlock::SimpleBlock(
 }
 
 
+BlockEntry::Kind SimpleBlock::GetKind() const
+{
+    return kBlockSimple;
+}
+
+
 const Block* SimpleBlock::GetBlock() const
 {
     return &m_block;
@@ -7841,6 +7854,12 @@ void BlockGroup::ParseBlock(long long start, long long size)
 #endif
 
 
+BlockEntry::Kind BlockGroup::GetKind() const
+{
+    return kBlockGroup;
+}
+
+
 const Block* BlockGroup::GetBlock() const
 {
     return &m_block;

mkvparser.hpp

@@ -121,6 +121,9 @@ public:
     long GetIndex() const;
     virtual const Block* GetBlock() const = 0;
 
+    enum Kind { kBlockEOS, kBlockSimple, kBlockGroup };
+    virtual Kind GetKind() const = 0;
+
 protected:
     Cluster* const m_pCluster;
     const long m_index;
@@ -139,6 +142,7 @@ public:
     //bool EOS() const;
     //const Cluster* GetCluster() const;
     //long GetIndex() const;
+    Kind GetKind() const;
     const Block* GetBlock() const;
 
 protected:
@@ -164,6 +168,7 @@ public:
     //bool EOS() const;
     //const Cluster* GetCluster() const;
     //long GetIndex() const;
+    Kind GetKind() const;
     const Block* GetBlock() const;
 
     short GetPrevTimeCode() const;  //relative to block's time
@@ -246,6 +251,7 @@ protected:
         //bool EOS() const;
         //const Cluster* GetCluster() const;
         //long GetIndex() const;
+        Kind GetKind() const;
         const Block* GetBlock() const;
     };