--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/ph_disp.h	Mon May 06 18:20:22 2024 +0000
@@ -0,0 +1,107 @@
+/*
+********************************************************************************
+*
+*      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             : ph_disp.h
+*      Purpose          : Phase dispersion of excitation signal
+*
+********************************************************************************
+*/
+
+#ifndef ph_disp_h
+#define ph_disp_h "$Id $"
+ 
+/*
+********************************************************************************
+*                         INCLUDE FILES
+********************************************************************************
+*/
+#include "tw_amr.h"
+#include "typedef.h"
+
+/*
+********************************************************************************
+*                         LOCAL VARIABLES AND TABLES
+********************************************************************************
+*/
+#define PHDGAINMEMSIZE 5
+#define PHDTHR1LTP     9830  /* 0.6 in Q14 */
+#define PHDTHR2LTP     14746 /* 0.9 in Q14 */
+#define ONFACTPLUS1    16384 /* 2.0 in Q13   */
+#define ONLENGTH 2
+/*
+********************************************************************************
+*                         DEFINITION OF DATA TYPES
+********************************************************************************
+*/
+typedef struct {
+  Word16 gainMem[PHDGAINMEMSIZE];
+  Word16 prevState;
+  Word16 prevCbGain;
+  Word16 lockFull;
+  Word16 onset;
+} ph_dispState;
+ 
+/*
+********************************************************************************
+*                         DECLARATION OF PROTOTYPES
+********************************************************************************
+*/
+
+/*************************************************************************
+*
+*  Function:   ph_disp_reset
+*  Purpose:    Initializes state memory
+*
+**************************************************************************
+*/
+void ph_disp_reset (ph_dispState *state);
+
+/*************************************************************************
+*
+*  Function:   ph_disp_lock
+*  Purpose:    mark phase dispersion as locked in state struct
+*
+**************************************************************************
+*/
+void ph_disp_lock (ph_dispState *state);
+
+/*************************************************************************
+*
+*  Function:   ph_disp_release
+*  Purpose:    mark phase dispersion as unlocked in state struct
+*
+**************************************************************************
+*/
+void ph_disp_release (ph_dispState *state);
+
+/*************************************************************************
+*
+*  Function:   ph_disp
+*  Purpose:    perform phase dispersion according to the specified codec
+*              mode and computes total excitation for synthesis part
+*              if decoder
+*
+**************************************************************************
+*/
+void ph_disp (
+      ph_dispState *state, /* i/o     : State struct                     */
+      enum Mode mode,      /* i       : codec mode                       */
+      Word16 x[],          /* i/o Q0  : in:  LTP excitation signal       */
+                           /*           out: total excitation signal     */
+      Word16 cbGain,       /* i   Q1  : Codebook gain                    */
+      Word16 ltpGain,      /* i   Q14 : LTP gain                         */
+      Word16 inno[],       /* i   Q13 : Innovation vector (Q12 for 12.2) */
+      Word16 pitch_fac,    /* i   Q14 : pitch factor used to scale the
+                                        LTP excitation (Q13 for 12.2)    */
+      Word16 tmp_shift     /* i   Q0  : shift factor applied to sum of   
+                                        scaled LTP ex & innov. before
+                                        rounding                         */
+);
+
+#endif