Revert "[FragmentedSampleReader] Create senc when saio/saiz/senc are …

…missing"

This reverts commit c4d224c.

src/samplereader/FragmentedSampleReader.cpp

@@ -22,8 +22,6 @@
 #include "utils/Utils.h"
 #include "utils/log.h"
 
-#include <bento4/Ap4SencAtom.h>
-
 using namespace UTILS;
 
 namespace
@@ -388,14 +386,6 @@ AP4_Result CFragmentedSampleReader::ProcessMoof(AP4_ContainerAtom* moof,
       if (!m_protectedDesc || !traf)
         return AP4_ERROR_INVALID_FORMAT;
 
-      // If the boxes saiz, saio, senc are missing, the stream does not conform to the specs and
-      // may not be decrypted, so try create an empty senc where all samples will use the same default IV
-      if (!traf->GetChild(AP4_ATOM_TYPE_SAIO) && !traf->GetChild(AP4_ATOM_TYPE_SAIZ) &&
-          !traf->GetChild(AP4_ATOM_TYPE_SENC))
-      {
-        traf->AddChild(new AP4_SencAtom());
-      }
-
       bool reset_iv(false);
       if (AP4_FAILED(result = AP4_CencSampleInfoTable::Create(m_protectedDesc, traf, algorithm_id,
                                                               reset_iv, *m_FragmentStream,