1 files changed, 117 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_QuantInter_I.c b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_QuantInter_I.c
new file mode 100644
index 0000000..5964f73
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+++ b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_QuantInter_I.c
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+/**
+ * 
+ * File Name:  omxVCM4P2_QuantInter_I.c
+ * OpenMAX DL: v1.0.2
+ * Revision:   9641
+ * Date:       Thursday, February 7, 2008
+ * 
+ * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
+ * 
+ * 
+ *
+ * Description:
+ * Contains modules for inter Quantization
+ * 
+ */
+ 
+#include "omxtypes.h"
+#include "armOMX.h"
+#include "omxVC.h"
+
+#include "armCOMM.h"
+
+/**
+ * Function:  omxVCM4P2_QuantInter_I   (6.2.4.4.3)
+ *
+ * Description:
+ * Performs quantization on an inter coefficient block; supports 
+ * bits_per_pixel == 8. 
+ *
+ * Input Arguments:
+ *   
+ *   pSrcDst - pointer to the input inter block coefficients; must be aligned 
+ *            on a 16-byte boundary. 
+ *   QP - quantization parameter (quantizer_scale) 
+ *   shortVideoHeader - binary flag indicating presence of short_video_header; 
+ *            shortVideoHeader==1 selects linear intra DC mode, and 
+ *            shortVideoHeader==0 selects non linear intra DC mode. 
+ *
+ * Output Arguments:
+ *   
+ *   pSrcDst - pointer to the output (quantized) interblock coefficients.  
+ *            When shortVideoHeader==1, AC coefficients are saturated on the 
+ *            interval [-127, 127], and DC coefficients are saturated on the 
+ *            interval [1, 254].  When shortVideoHeader==0, AC coefficients 
+ *            are saturated on the interval [-2047, 2047]. 
+ *
+ * Return Value:
+ *    
+ *    OMX_Sts_NoErr - no error 
+ *    OMX_Sts_BadArgErr - bad arguments:
+ *    -    pSrcDst is NULL. 
+ *    -    QP <= 0 or QP >= 32. 
+ *
+ */
+
+OMXResult omxVCM4P2_QuantInter_I(
+     OMX_S16 * pSrcDst,
+     OMX_U8 QP,
+	 OMX_INT shortVideoHeader
+)
+{
+
+    /* Definitions and Initializations*/
+    OMX_INT coeffCount;
+    OMX_INT fSign;
+    OMX_INT maxClpAC = 0, minClpAC = 0;
+    OMX_INT maxClpDC = 0, minClpDC = 0;
+    
+    /* Argument error checks */
+    armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr);
+    armRetArgErrIf(((QP <= 0) || (QP >= 32)), OMX_Sts_BadArgErr);
+   /* One argument check is delayed until we have ascertained that  */
+   /* pQMatrix is not NULL.                                         */
+                
+    /* Set the Clip Range based on SVH on/off */
+    if(shortVideoHeader == 1)
+    {
+       maxClpDC = 254;
+       minClpDC = 1;
+       maxClpAC = 127;
+       minClpAC = -127;        
+    }
+    else
+    {
+        maxClpDC = 2047;
+        minClpDC = -2047;
+        maxClpAC = 2047;
+        minClpAC = -2047;   
+    }
+                
+    /* Second Inverse quantisation method */
+    for (coeffCount = 0; coeffCount < 64; coeffCount++)
+    {
+        fSign =  armSignCheck (pSrcDst[coeffCount]);  
+        pSrcDst[coeffCount] = (armAbs(pSrcDst[coeffCount]) 
+                              - (QP/2))/(2 * QP);
+        pSrcDst[coeffCount] *= fSign;
+        
+        /* Clip */
+        if (coeffCount == 0)
+        {
+           pSrcDst[coeffCount] =
+           (OMX_S16) armClip (minClpDC, maxClpDC, pSrcDst[coeffCount]);
+        }
+        else
+        {
+           pSrcDst[coeffCount] =
+           (OMX_S16) armClip (minClpAC, maxClpAC, pSrcDst[coeffCount]);
+        }
+    }
+    return OMX_Sts_NoErr;
+
+}
+
+/* End of file */
+
+