add API call to properly sum two frames of SLINEAR data

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@6883 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 22 insertions, 0 deletions

diff --git a/frame.c b/frame.c
index 39bed2e01..5952b1d74 100755
--- a/frame.c
+++ b/frame.c
@@ -1271,3 +1271,25 @@ int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
 
 	return 0;
 }
+
+int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
+{
+	int count;
+	short *data1, *data2;
+
+	if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
+		return -1;
+
+	if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
+		return -1;
+
+	if (f1->samples != f2->samples)
+		return -1;
+
+	for (count = 0, data1 = f1->data, data2 = f2->data;
+	     count < f1->samples;
+	     count++, data1++, data2++)
+		ast_slinear_saturated_add(data1, *data2);
+
+	return 0;
+}