[Asterisk-cvs] asterisk frame.c,1.65,1.66

[kpfleming]

Update of /usr/cvsroot/asterisk
In directory mongoose.digium.com:/tmp/cvs-serv665

Modified Files:
	frame.c 
Log Message:
add API function to perform volume adjustment on a frame of SLINEAR data
documentation cleanup


Index: frame.c
===================================================================
RCS file: /usr/cvsroot/asterisk/frame.c,v
retrieving revision 1.65
retrieving revision 1.66
diff -u -d -r1.65 -r1.66
--- frame.c	24 Oct 2005 20:12:05 -0000	1.65
+++ frame.c	28 Oct 2005 16:20:44 -0000	1.66
@@ -1252,3 +1252,22 @@
 
 	return len;
 }
+
+int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
+{
+	int count;
+	short *fdata = f->data;
+
+	if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
+		return -1;
+
+	for (count = 0; count < f->samples; count++) {
+		if (adjustment > 0) {
+			fdata[count] *= abs(adjustment);
+		} else if (adjustment < 0) {
+			fdata[count] /= abs(adjustment);
+		}
+	}
+
+	return 0;
+}