--- a/libgsmefr/codec.h	Sat Nov 26 17:56:24 2022 +0000
+++ b/libgsmefr/codec.h	Sat Nov 26 18:52:49 2022 +0000
@@ -10,10 +10,10 @@
 
 void Decoder_12k2 (
     struct EFR_decoder_state *st,
-    Word16 bfi,        /* input : Bad Frame Indication                */
-    Word16 parm[],     /* input : vector of synthesis parameters      */
-    Word16 synth[],    /* output: synthesis speech                    */
-    Word16 A_t[],      /* output: decoded LP filter in 4 subframes    */
+    Word16 bfi,          /* input : Bad Frame Indication                */
+    const Word16 parm[], /* input : vector of synthesis parameters      */
+    Word16 synth[],      /* output: synthesis speech                    */
+    Word16 A_t[],        /* output: decoded LP filter in 4 subframes    */
     Word16 TAF,
     Word16 SID_flag
 );
@@ -36,8 +36,8 @@
     Word16 indx[]      /* (o)   : index of 10 pulses (sign + position)      */
 );
 void dec_10i40_35bits (
-    Word16 index[],    /* (i)   : index of 10 pulses (sign+position)        */
-    Word16 cod[]       /* (o)   : algebraic (fixed) codebook excitation     */
+    const Word16 index[],/* (i)   : index of 10 pulses (sign+position)        */
+    Word16 cod[]         /* (o)   : algebraic (fixed) codebook excitation     */
 );
 
 Word16 Dec_lag6 (      /* output: return integer pitch lag                  */
@@ -77,11 +77,11 @@
 );
 void D_plsf_5 (
     struct EFR_decoder_state *st,
-    Word16 *indice,    /* input : quantization indices of 5 submatrices     */
-    Word16 *lsp1_q,    /* output: quantized 1st LSP vector                  */
-    Word16 *lsp2_q,    /* output: quantized 2nd LSP vector                  */
-    Word16 bfi,        /* input : bad frame indicator (set to 1 if a bad
-                                  frame is received)                        */
+    const Word16 *indice,/* input : quantization indices of 5 submatrices     */
+    Word16 *lsp1_q,      /* output: quantized 1st LSP vector                  */
+    Word16 *lsp2_q,      /* output: quantized 2nd LSP vector                  */
+    Word16 bfi,          /* input : bad frame indicator (set to 1 if a bad
+                                    frame is received)                        */
     Word16 rxdtx_ctrl,
     Word16 rx_dtx_state
 );