add API call to properly sum two frames of SLINEAR data

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6883 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 11 insertions, 0 deletions

diff --git a/include/asterisk/frame.h b/include/asterisk/frame.h
index c17e2eecb..551138005 100755
--- a/include/asterisk/frame.h
+++ b/include/asterisk/frame.h
@@ -427,6 +427,17 @@ static inline int ast_codec_interp_len(int format)
  */
 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment);
 
+/*!
+  \brief Sums two frames of audio samples.
+  \param f1 The first frame (which will contain the result)
+  \param f2 The second frame
+  \return 0 for success, non-zero for an error
+
+  The frames must be AST_FRAME_VOICE and must contain AST_FORMAT_SLINEAR samples,
+  and must contain the same number of samples.
+ */
+int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2);
+
 #if defined(__cplusplus) || defined(c_plusplus)
 }
 #endif