[Opalvoip-svn] SF.net SVN: opalvoip:[34715] ptlib/trunk

[<rjo...@us...>]

Revision: 34715
          http://sourceforge.net/p/opalvoip/code/34715
Author:   rjongbloed
Date:     2016-03-22 13:47:56 +0000 (Tue, 22 Mar 2016)
Log Message:
-----------
Added PColourConverter::YUVtoRGB()

Modified Paths:
--------------
    ptlib/trunk/include/ptlib/vconvert.h
    ptlib/trunk/src/ptlib/common/vconvert.cxx

Modified: ptlib/trunk/include/ptlib/vconvert.h
===================================================================
--- ptlib/trunk/include/ptlib/vconvert.h	2016-03-21 19:18:02 UTC (rev 34714)
+++ ptlib/trunk/include/ptlib/vconvert.h	2016-03-22 13:47:56 UTC (rev 34715)
@@ -285,6 +285,13 @@
       BYTE   & y, BYTE   & u, BYTE   & v
     );
 
+    /**Convert YUV to RGB.
+      */
+    static void YUVtoRGB(
+      unsigned y, unsigned u, unsigned v,
+      BYTE   & r, BYTE   & g, BYTE   & b
+    );
+
     /**Copy a section of the source frame to a section of the destination
        frame with scaling/cropping as required.
       */

Modified: ptlib/trunk/src/ptlib/common/vconvert.cxx
===================================================================
--- ptlib/trunk/src/ptlib/common/vconvert.cxx	2016-03-21 19:18:02 UTC (rev 34714)
+++ ptlib/trunk/src/ptlib/common/vconvert.cxx	2016-03-22 13:47:56 UTC (rev 34715)
@@ -1868,6 +1868,25 @@
  * B = Y + 1.772 (Cb-128)
  * 
  */
+
+void PColourConverter::YUVtoRGB(unsigned y, unsigned u, unsigned v,
+                                BYTE   & r, BYTE   & g, BYTE   & b)
+{
+    FixedPoint cb = u - 128;
+    FixedPoint cr = v - 128;
+    FixedPoint rd = ROUND(YUVtoR_Coeff * cr);
+    FixedPoint gd = ROUND(YUVtoG_Coeff1 * cb - YUVtoG_Coeff2 * cr);
+    FixedPoint bd = ROUND(YUVtoB_Coeff * cb);
+    FixedPoint yvalue = y << ScaleBitShift;
+    FixedPoint rvalue = yvalue + rd;
+    FixedPoint gvalue = yvalue + gd;
+    FixedPoint bvalue = yvalue + bd;
+    r = CLAMP(rvalue);
+    g = CLAMP(gvalue);
+    b = CLAMP(bvalue);
+}
+
+
 bool PStandardColourConverter::YUV420PtoRGB(const BYTE * srcFrameBuffer,
                                             BYTE * dstFrameBuffer,
                                             PINDEX * bytesReturned,

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