Add iLBC codec

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@852 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/ilbc/LPCdecode.h

@@ -0,0 +1,42 @@
+ 
+/****************************************************************** 
+ 
+    iLBC Speech Coder ANSI-C Source Code 
+ 
+    LPC_decode.h      
+ 
+    Copyright (c) 2001, 
+    Global IP Sound AB. 
+    All rights reserved. 
+ 
+******************************************************************/ 
+ 
+#ifndef __iLBC_LPC_DECODE_H 
+#define __iLBC_LPC_DECODE_H 
+ 
+void LSFinterpolate2a_dec(  
+    float *a,           /* (o) lpc coefficients for a sub frame */ 
+    float *lsf1,    /* (i) first lsf coefficient vector */ 
+    float *lsf2,    /* (i) second lsf coefficient vector */ 
+    float coef,         /* (i) interpolation weight */ 
+    int length          /* (i) length of lsf vectors */ 
+); 
+       
+void SimplelsfDEQ(  
+    float *lsfdeq,      /* (o) dequantized lsf coefficients */ 
+    int *index          /* (i) quantization index */ 
+); 
+ 
+void DecoderInterpolateLSF(  
+    float *syntdenum,   /* (o) synthesis filter coefficients */ 
+    float *weightdenum, /* (o) weighting denumerator  
+                               coefficients */ 
+    float *lsfdeq,      /* (i) dequantized lsf coefficients */ 
+    int length,         /* (i) length of lsf coefficient vector */ 
+    iLBC_Dec_Inst_t *iLBCdec_inst  
+                        /* (i) the decoder state structure */ 
+); 
+ 
+#endif 
+ 
+