Add iLBC codec

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@852 65c4cc65-6c06-0410-ace0-fbb531ad65f3
2025-09-04 20:04:50 +00:00 · 2003-04-15 04:36:52 +00:00
parent dbe00ec2d2
commit c4da749362
58 changed files with 6857 additions and 1 deletions
--- a/codecs/ilbc/helpfun.h
+++ b/codecs/ilbc/helpfun.h
@@ -0,0 +1,93 @@
+ 
+/****************************************************************** 
+ 
+    iLBC Speech Coder ANSI-C Source Code 
+ 
+    helpfun.h          
+ 
+    Copyright (c) 2001, 
+    Global IP Sound AB. 
+    All rights reserved. 
+ 
+******************************************************************/ 
+ 
+#ifndef __iLBC_HELPFUN_H 
+#define __iLBC_HELPFUN_H 
+ 
+void autocorr(  
+    float *r,       /* (o) autocorrelation vector */ 
+    const float *x, /* (i) data vector */ 
+    int N,          /* (i) length of data vector */ 
+    int order       /* largest lag for calculated autocorrelations */ 
+); 
+ 
+void window(  
+    float *z,       /* (o) the windowed data */ 
+    const float *x, /* (i) the original data vector */ 
+    const float *y, /* (i) the window */ 
+    int N           /* (i) length of all vectors */ 
+); 
+ 
+void levdurb(  
+    float *a,       /* (o) lpc coefficient vector starting  
+                           with 1.0 */ 
+    float *k,       /* (o) reflection coefficients */ 
+    float *r,       /* (i) autocorrelation vector */ 
+    int order       /* (i) order of lpc filter */ 
+); 
+ 
+void interpolate(  
+    float *out,     /* (o) the interpolated vector */ 
+    float *in1,     /* (i) the first vector for the interpolation */ 
+    float *in2,     /* (i) the second vector for the interpolation */ 
+    float coef,     /* (i) interpolation weights */ 
+    int length      /* (i) length of all vectors */ 
+); 
+            
+void bwexpand(  
+    float *out,     /* (o) the bandwidth expanded lpc coefficients */ 
+    float *in,      /* (i) the lpc coefficients before bandwidth  
+                           expansion */ 
+    float coef,     /* (i) the bandwidth expansion factor */ 
+    int length      /* (i) the length of lpc coefficient vectors */ 
+); 
+ 
+void vq(  
+    float *Xq,      /* (o) the quantized vector */ 
+    int *index,     /* (o) the quantization index */ 
+    const float *CB,/* (i) the vector quantization codebook */ 
+    float *X,       /* (i) the vector to quantize */ 
+    int n_cb,       /* (i) the number of vectors in the codebook */ 
+    int dim         /* (i) the dimension of all vectors */ 
+);   
+ 
+void SplitVQ(  
+    float *qX,      /* (o) the quantized vector */ 
+    int *index,     /* (o) a vector of indexes for all vector 
+                           codebooks in the split */ 
+    float *X,       /* (i) the vector to quantize */ 
+    const float *CB,/* (i) the quantizer codebook */ 
+    int nsplit,     /* the number of vector splits */ 
+    const int *dim, /* the dimension of X and qX */ 
+    const int *cbsize /* the number of vectors in the codebook */ 
+); 
+ 
+ 
+void sort_sq(  
+    float *xq,      /* (o) the quantized value */ 
+    int *index,     /* (o) the quantization index */ 
+    float x,    /* (i) the value to quantize */ 
+    const float *cb,/* (i) the quantization codebook */ 
+    int cb_size     /* (i) the size of the quantization codebook */ 
+); 
+ 
+int LSF_check(      /* (o) 1 for stable lsf vectors and 0 for  
+                           nonstable ones */ 
+    float *lsf,     /* (i) a table of lsf vectors */ 
+    int dim,    /* (i) the dimension of each lsf vector */ 
+    int NoAn    /* (i) the number of lsf vectors in the table */ 
+); 
+ 
+#endif 
+ 
+