--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/e_homing.c	Mon May 06 01:57:25 2024 +0000
@@ -0,0 +1,70 @@
+/*
+*****************************************************************************
+*
+*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
+*                                R99   Version 3.3.0                
+*                                REL-4 Version 4.1.0                
+*
+*****************************************************************************
+*
+*      File             : e_homing.c
+*
+*****************************************************************************
+*/
+
+/*
+*****************************************************************************
+*                         MODULE INCLUDE FILE AND VERSION ID
+*****************************************************************************
+*/
+
+#include "namespace.h"
+#include "e_homing.h"
+
+/*
+*****************************************************************************
+*                         INCLUDE FILES
+*****************************************************************************
+*/
+
+#include "typedef.h"
+#include "cnst.h"
+
+/*
+*****************************************************************************
+*                         PUBLIC PROGRAM CODE
+*****************************************************************************
+*/
+
+/*
+********************************************************************************
+*
+*     Function        : encoder_homing_frame_test
+*     In              : input_frame[]  one frame of speech samples
+*     Out             : none
+*     Calls           : none
+*     Tables          : none
+*     Compile Defines : none
+*     Return          : 0  input frame does not match the encoder homing frame pattern
+*                       1  input frame matches the encoder homing frame pattern
+*     Information     : Checks if all samples of the input frame matches the encoder
+*                       homing frame pattern, which is 0x0008 for all samples.
+*
+********************************************************************************
+*/
+
+Word16 encoder_homing_frame_test (Word16 input_frame[])
+{
+    Word16 i, j;
+
+    /* check 160 input samples for matching EHF_MASK: defined in e_homing.h */
+    for (i = 0; i < L_FRAME; i++)
+    {
+        j = input_frame[i] ^ EHF_MASK;
+
+        if (j)
+            break;
+    }
+
+    return !j;
+}