[libvidcap-commit] SF.net SVN: libvidcap: [30] trunk/src/conv_to_yuy2.c

[libvidcap c. m. <lib...@li...>]

Revision: 30
          http://libvidcap.svn.sourceforge.net/libvidcap/?rev=30&view=rev
Author:   bcholew
Date:     2007-09-25 06:15:23 -0700 (Tue, 25 Sep 2007)

Log Message:
-----------
Add function to convert from i420 to yuy2.

Modified Paths:
--------------
    trunk/src/conv_to_yuy2.c

Modified: trunk/src/conv_to_yuy2.c
===================================================================
--- trunk/src/conv_to_yuy2.c	2007-09-24 18:49:27 UTC (rev 29)
+++ trunk/src/conv_to_yuy2.c	2007-09-25 13:15:23 UTC (rev 30)
@@ -38,8 +38,44 @@
 int
 vidcap_i420_to_yuy2(int width, int height, const char * src, char * dest)
 {
-	log_error("vidcap_i420_to_yuy2() not implemented\n");
-	return -1;
+	/* convert from a planar structure to a packed structure */
+	const char * src_y_even = src;
+	const char * src_y_odd = src + width;
+	const char * src_u = src + width * height;
+	const char * src_v = src_u + width * height / 4;
+	char * dst_even = dest;
+	char * dst_odd = dest + width * 2;
+
+	int i, j;
+
+	/* i420 has a vertical sampling period (for u and v)
+	 * double that for yuy2. Will re-use
+	 * U and V data during repackaging.
+	 */
+	for ( i = 0; i < height / 2; ++i )
+	{
+		for ( j = 0; j < width / 2; ++j )
+		{
+			*dst_even++ = *src_y_even++;
+			*dst_odd++  = *src_y_odd++;
+
+			*dst_even++ = *src_u;
+			*dst_odd++  = *src_u++;
+
+			*dst_even++ = *src_y_even++;
+			*dst_odd++  = *src_y_odd++;
+
+			*dst_even++ = *src_v;
+			*dst_odd++  = *src_v++;
+		}
+
+		src_y_even += width;
+		src_y_odd += width;
+		dst_even += width * 2;
+		dst_odd += width * 2;
+	}
+
+	return 0;
 }
 
 int


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