--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/sid_sync.h	Mon May 06 19:58:22 2024 +0000
@@ -0,0 +1,74 @@
+/*
+*****************************************************************************
+*
+*      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             : sid_sync.h
+*      Purpose          : To ensure that the mode only switches to a
+*                         neighbouring mode
+*
+*****************************************************************************
+*/
+#ifndef sid_sync_h
+#define sid_sync_h "$Id $"
+ 
+/*
+*****************************************************************************
+*                         INCLUDE FILES
+*****************************************************************************
+*/
+#include "tw_amr.h"
+#include "typedef.h"
+ 
+/*
+******************************************************************************
+*                         CONSTANTS
+******************************************************************************
+*/
+
+/*
+******************************************************************************
+*                         DEFINITION OF DATA TYPES
+******************************************************************************
+*/
+typedef struct {
+    Word16 sid_update_rate;  /* Send SID Update every sid_update_rate frame */
+    Word16 sid_update_counter; /* Number of frames since last SID          */
+    Word16 sid_handover_debt;  /* Number of extra SID_UPD frames to schedule*/
+    enum TXFrameType prev_ft;
+} sid_syncState;
+ 
+/*
+*****************************************************************************
+*                         LOCAL VARIABLES AND TABLES
+*****************************************************************************
+*/
+ 
+/*
+*****************************************************************************
+*                         DECLARATION OF PROTOTYPES
+*****************************************************************************
+*/
+ 
+void sid_sync_reset (sid_syncState *st);
+/* reset of sid_sync module (i.e. set state memory to zero)
+   returns 0 on success
+ */
+
+int sid_sync_set_handover_debt (sid_syncState *st, /* i/o: sid_sync state  */
+                                Word16 debtFrames);
+/*  update handover debt 
+    debtFrames extra SID_UPD are scheduled .
+    to update remote decoder CNI states, right after an handover.
+    (primarily for use on MS UL side )  
+*/ 
+
+void sid_sync(sid_syncState *st , /* i/o: sid_sync state      */
+              enum Mode mode,
+              enum TXFrameType *tx_frame_type); 
+
+#endif