--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/d_plsf.c	Fri Apr 19 01:08:39 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             : d_plsf.c
+*      Purpose          : common part (init, exit, reset) of LSF decoder
+*                         module (rest in d_plsf_3.c and d_plsf_5.c)
+*
+*****************************************************************************
+*/
+ 
+ 
+/*
+*****************************************************************************
+*                         MODULE INCLUDE FILE AND VERSION ID
+*****************************************************************************
+*/
+#include "namespace.h"
+#include "d_plsf.h"
+ 
+/*
+*****************************************************************************
+*                         INCLUDE FILES
+*****************************************************************************
+*/
+#include "typedef.h"
+#include "basic_op.h"
+#include "no_count.h"
+#include "cnst.h"
+#include "memops.h"
+#include "q_plsf5_tab.h"
+
+/*
+*--------------------------------------------------*
+* Constants (defined in cnst.h)                    *
+*--------------------------------------------------*
+*  M                    : LPC order
+*--------------------------------------------------*
+*/
+ 
+/*
+*****************************************************************************
+*                         PUBLIC PROGRAM CODE
+*****************************************************************************
+*/
+ 
+/*
+**************************************************************************
+*
+*  Function    : D_plsf_reset
+*  Purpose     : Resets state memory
+*
+**************************************************************************
+*/
+void D_plsf_reset (D_plsfState *state)
+{
+  Word16 i;
+  
+  for (i = 0; i < M; i++){
+      state->past_r_q[i] = 0;             /* Past quantized prediction error */
+  }
+  
+  /* Past dequantized lsfs */
+  Copy(mean_lsf, &state->past_lsf_q[0], M);
+}