1 files changed, 156 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_CheckVLCEscapeMode.c b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_CheckVLCEscapeMode.c
new file mode 100644
index 0000000..94e8639
--- /dev/null
+++ b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_CheckVLCEscapeMode.c
@@ -0,0 +1,156 @@
+/**
+ * 
+ * File Name:  armVCM4P2_CheckVLCEscapeMode.c
+ * OpenMAX DL: v1.0.2
+ * Revision:   9641
+ * Date:       Thursday, February 7, 2008
+ * 
+ * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
+ * 
+ * 
+ * 
+ * Description:
+ * Contains module for VLC escape mode check 
+ *
+ */ 
+ 
+#include "omxtypes.h"
+#include "armOMX.h"
+
+#include "armVC.h"
+#include "armCOMM.h"
+
+/**
+ * Function: armVCM4P2_CheckVLCEscapeMode
+ *
+ * Description:
+ * Performs escape mode decision based on the run, run+, level, level+ and 
+ * last combinations.
+ *
+ * Remarks:
+ *
+ * Parameters:
+ * [in] run             Run value (count of zeros) to be encoded  
+ * [in] level           Level value (non-zero value) to be encoded
+ * [in] runPlus         Calculated as runPlus = run - (RMAX + 1)  
+ * [in] levelPlus       Calculated as 
+ *                      levelPlus = sign(level)*[abs(level) - LMAX]
+ * [in] maxStoreRun     Max store possible (considering last and inter/intra)
+ * [in] maxRunForMultipleEntries 
+ *                      The run value after which level 
+ *                      will be equal to 1: 
+ *                      (considering last and inter/intra status)
+ * [in] pRunIndexTable  Run Index table defined in 
+ *                      armVCM4P2_Huff_Tables_VLC.c
+ *                      (considering last and inter/intra status)
+ *
+ *                      
+ * Return Value:
+ * Returns an Escape mode which can take values from 0 to 3
+ * 0 --> no escape mode, 1 --> escape type 1,
+ * 1 --> escape type 2, 3 --> escape type 3, check section 7.4.1.3
+ * in the MPEG ISO standard.
+ *
+ */
+
+OMX_U8 armVCM4P2_CheckVLCEscapeMode(
+     OMX_U32 run,
+     OMX_U32 runPlus,
+     OMX_S16 level,
+     OMX_S16 levelPlus,
+     OMX_U8  maxStoreRun,
+     OMX_U8  maxRunForMultipleEntries,
+     OMX_INT shortVideoHeader,
+     const OMX_U8  *pRunIndexTable
+)
+{
+    OMX_U8 escape = 0, fMode = 0, entries;
+    
+    level = armAbs (level);
+    levelPlus = armAbs (levelPlus);
+    
+    /* Check for a valid entry with run, level and Last combination 
+       Mode 0 check */
+    if (run <= maxStoreRun)
+    {
+        entries = pRunIndexTable[run + 1]
+                  - pRunIndexTable[run];
+        if (run > maxRunForMultipleEntries)
+        {
+            entries = 1;
+        }
+        if (level > entries)
+        {
+            escape = 1;
+        }
+    }
+    else
+    {
+        escape = 1;
+    }
+    if(escape && shortVideoHeader)
+    {
+        escape = 0;
+        fMode = 4;
+    }
+    /* Check for a valid entry with run, levelPlus and Last combination 
+       Mode 1 check */    
+    if (escape)
+    {
+        escape = 0;
+        fMode = 1;
+        if (run <= maxStoreRun)
+        {
+            entries = pRunIndexTable[run + 1]
+                      - pRunIndexTable[run];
+            if (run > maxRunForMultipleEntries)
+            {
+                entries = 1;
+            }
+            if (levelPlus > entries)
+            {
+                escape = 1;
+            }
+        }
+        else
+        {
+            escape = 1;
+        }
+    }
+    
+    /* Check for a valid entry with runPlus, level and Last combination 
+       Mode 2 check */    
+    if (escape)
+    {
+        escape = 0;
+        fMode = 2;
+        if (runPlus <= maxStoreRun)
+        {
+            entries = pRunIndexTable[runPlus + 1]
+                      - pRunIndexTable[runPlus];
+            if (runPlus > maxRunForMultipleEntries)
+            {
+                entries = 1;
+            }
+            if (level > entries)
+            {
+                escape = 1;
+            }
+        }
+        else
+        {
+            escape = 1;
+        }
+    }
+    
+    /* select mode 3 --> FLC */
+    if (escape)
+    {
+        fMode = 3;
+    }
+    
+    return fMode;
+}
+
+/*End of File*/
+