--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/qgain475.h	Mon May 06 04:14:52 2024 +0000
@@ -0,0 +1,92 @@
+/*
+********************************************************************************
+*
+*      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             : qgain475.h
+*      Purpose          : Quantization of pitch and codebook gains for MR475.
+*
+********************************************************************************
+*/
+#ifndef qgain475_h
+#define qgain475_h "$Id $"
+ 
+/*
+********************************************************************************
+*                         INCLUDE FILES
+********************************************************************************
+*/
+#include "typedef.h"
+#include "gc_pred.h"
+
+/*
+********************************************************************************
+*                         DECLARATION OF PROTOTYPES
+********************************************************************************
+*/
+
+/*************************************************************************
+ *
+ * FUNCTION:  MR475_update_unq_pred()
+ *
+ * PURPOSE:   use optimum codebook gain and update "unquantized"
+ *            gain predictor with the (bounded) prediction error
+ *
+ *************************************************************************/
+void 
+MR475_update_unq_pred(
+    gc_predState *pred_st, /* i/o: gain predictor state struct            */
+    Word16 exp_gcode0,     /* i  : predicted CB gain (exponent),      Q0  */
+    Word16 frac_gcode0,    /* i  : predicted CB gain (fraction),      Q15 */
+    Word16 cod_gain_exp,   /* i  : optimum codebook gain (exponent),  Q0  */
+    Word16 cod_gain_frac   /* i  : optimum codebook gain (fraction),  Q15 */
+);
+
+/*************************************************************************
+ *
+ * FUNCTION:  MR475_gain_quant()
+ *
+ * PURPOSE: Quantization of pitch and codebook gains for two subframes
+ *          (using predicted codebook gain)
+ *
+ *************************************************************************/
+
+Word16
+MR475_gain_quant(              /* o  : index of quantization.                 */
+    gc_predState *pred_st,     /* i/o: gain predictor state struct            */
+      
+                               /* data from subframe 0 (or 2) */
+    Word16 sf0_exp_gcode0,     /* i  : predicted CB gain (exponent),      Q0  */
+    Word16 sf0_frac_gcode0,    /* i  : predicted CB gain (fraction),      Q15 */
+    Word16 sf0_exp_coeff[],    /* i  : energy coeff. (5), exponent part,  Q0  */
+    Word16 sf0_frac_coeff[],   /* i  : energy coeff. (5), fraction part,  Q15 */
+                               /*      (frac_coeff and exp_coeff computed in  */
+                               /*       calc_filt_energies())                 */
+    Word16 sf0_exp_target_en,  /* i  : exponent of target energy,         Q0  */
+    Word16 sf0_frac_target_en, /* i  : fraction of target energy,         Q15 */
+      
+                               /* data from subframe 1 (or 3) */
+    Word16 sf1_code_nosharp[], /* i  : innovative codebook vector (L_SUBFR)   */
+                               /*      (whithout pitch sharpening)            */
+    Word16 sf1_exp_gcode0,     /* i  : predicted CB gain (exponent),      Q0  */
+    Word16 sf1_frac_gcode0,    /* i  : predicted CB gain (fraction),      Q15 */
+    Word16 sf1_exp_coeff[],    /* i  : energy coeff. (5), exponent part,  Q0  */
+    Word16 sf1_frac_coeff[],   /* i  : energy coeff. (5), fraction part,  Q15 */
+                               /*      (frac_coeff and exp_coeff computed in  */
+                               /*       calc_filt_energies())                 */
+    Word16 sf1_exp_target_en,  /* i  : exponent of target energy,         Q0  */
+    Word16 sf1_frac_target_en, /* i  : fraction of target energy,         Q15 */
+
+    Word16 gp_limit,           /* i  : pitch gain limit                       */
+
+    Word16 *sf0_gain_pit,      /* o  : Pitch gain,                        Q14 */
+    Word16 *sf0_gain_cod,      /* o  : Code gain,                         Q1  */
+      
+    Word16 *sf1_gain_pit,      /* o  : Pitch gain,                        Q14 */
+    Word16 *sf1_gain_cod       /* o  : Code gain,                         Q1  */
+);
+#endif