1 files changed, 138 insertions, 0 deletions
diff --git a/Src/h264dec/ldecod/src/errorconcealment.c b/Src/h264dec/ldecod/src/errorconcealment.c
new file mode 100644
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+++ b/Src/h264dec/ldecod/src/errorconcealment.c
@@ -0,0 +1,138 @@
+
+/*!
+ ***********************************************************************
+ * \file errorconcealment.c
+ *
+ * \brief
+ *    Implements error concealment scheme for H.264 decoder
+ *
+ * \date
+ *    6.10.2000
+ *
+ * \version
+ *    1.0
+ *
+ * \note
+ *    This simple error concealment implemented in this decoder uses
+ *    the existing dependencies of syntax elements.
+ *    In case that an element is detected as false this elements and all
+ *    dependend elements are marked as elements to conceal in the p_Vid->ec_flag[]
+ *    array. If the decoder requests a new element by the function
+ *    readSyntaxElement_xxxx() this array is checked first if an error concealment has
+ *    to be applied on this element.
+ *    In case that an error occured a concealed element is given to the
+ *    decoding function in macroblock().
+ *
+ * \author
+ *    Main contributors (see contributors.h for copyright, address and affiliation details)
+ *    - Sebastian Purreiter   <sebastian.purreiter@mch.siemens.de>
+ ***********************************************************************
+ */
+
+#include "contributors.h"
+#include "global.h"
+#include "elements.h"
+
+
+
+/*!
+ ***********************************************************************
+ * \brief
+ *    set concealment for all elements in same partition
+ *    and dependend syntax elements
+ * \param p_Vid
+ *      image encoding parameters for current picture
+ * \param se
+ *      type of syntax element to conceal
+ * \return
+ *    EC_REQ, elements of same type or depending type need error concealment. \n
+ *    EX_SYNC   sync on next header
+ ***********************************************************************
+ */
+int set_ec_flag(VideoParameters *p_Vid, int se)
+{
+
+  /*
+  if (p_Vid->ec_flag[se] == NO_EC)
+    printf("Error concealment on element %s\n",SEtypes[se]);
+  */
+  switch (se)
+  {
+  case SE_HEADER :
+    p_Vid->ec_flag[SE_HEADER] = EC_REQ;
+  case SE_PTYPE :
+    p_Vid->ec_flag[SE_PTYPE] = EC_REQ;
+  case SE_MBTYPE :
+    p_Vid->ec_flag[SE_MBTYPE] = EC_REQ;
+
+  case SE_REFFRAME :
+    p_Vid->ec_flag[SE_REFFRAME] = EC_REQ;
+    p_Vid->ec_flag[SE_MVD] = EC_REQ; // set all motion vectors to zero length
+    se = SE_CBP_INTER;      // conceal also Inter texture elements
+    break;
+
+  case SE_INTRAPREDMODE :
+    p_Vid->ec_flag[SE_INTRAPREDMODE] = EC_REQ;
+    se = SE_CBP_INTRA;      // conceal also Intra texture elements
+    break;
+  case SE_MVD :
+    p_Vid->ec_flag[SE_MVD] = EC_REQ;
+    se = SE_CBP_INTER;      // conceal also Inter texture elements
+    break;
+
+  default:
+    break;
+  }
+
+  switch (se)
+  {
+  case SE_CBP_INTRA :
+    p_Vid->ec_flag[SE_CBP_INTRA] = EC_REQ;
+  case SE_LUM_DC_INTRA :
+    p_Vid->ec_flag[SE_LUM_DC_INTRA] = EC_REQ;
+  case SE_CHR_DC_INTRA :
+    p_Vid->ec_flag[SE_CHR_DC_INTRA] = EC_REQ;
+  case SE_LUM_AC_INTRA :
+    p_Vid->ec_flag[SE_LUM_AC_INTRA] = EC_REQ;
+  case SE_CHR_AC_INTRA :
+    p_Vid->ec_flag[SE_CHR_AC_INTRA] = EC_REQ;
+    break;
+
+  case SE_CBP_INTER :
+    p_Vid->ec_flag[SE_CBP_INTER] = EC_REQ;
+  case SE_LUM_DC_INTER :
+    p_Vid->ec_flag[SE_LUM_DC_INTER] = EC_REQ;
+  case SE_CHR_DC_INTER :
+    p_Vid->ec_flag[SE_CHR_DC_INTER] = EC_REQ;
+  case SE_LUM_AC_INTER :
+    p_Vid->ec_flag[SE_LUM_AC_INTER] = EC_REQ;
+  case SE_CHR_AC_INTER :
+    p_Vid->ec_flag[SE_CHR_AC_INTER] = EC_REQ;
+    break;
+  case SE_DELTA_QUANT_INTER :
+    p_Vid->ec_flag[SE_DELTA_QUANT_INTER] = EC_REQ;
+    break;
+  case SE_DELTA_QUANT_INTRA :
+    p_Vid->ec_flag[SE_DELTA_QUANT_INTRA] = EC_REQ;
+    break;
+  default:
+    break;
+
+  }
+  return EC_REQ;
+}
+
+/*!
+ ***********************************************************************
+ * \brief
+ *    resets EC_Flags called at the start of each slice
+ *
+ ***********************************************************************
+ */
+void reset_ec_flags(VideoParameters *p_Vid)
+{
+  int i;
+  for (i=0; i<SE_MAX_ELEMENTS; i++)
+    p_Vid->ec_flag[i] = NO_EC;
+}
+