Add iLBC codec

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@852 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 58 insertions, 0 deletions

diff --git a/codecs/ilbc/hpInput.c b/codecs/ilbc/hpInput.c
new file mode 100755
index 000000000..1599c2923
--- /dev/null
+++ b/codecs/ilbc/hpInput.c
@@ -0,0 +1,58 @@
+ 
+/****************************************************************** 
+ 
+    iLBC Speech Coder ANSI-C Source Code 
+ 
+    hpInput.c  
+ 
+    Copyright (c) 2001, 
+    Global IP Sound AB. 
+    All rights reserved. 
+ 
+******************************************************************/ 
+ 
+#include "constants.h" 
+ 
+/*----------------------------------------------------------------* 
+ *  Input high-pass filter                           
+ *---------------------------------------------------------------*/ 
+ 
+void hpInput(  
+    float *In,  /* (i) vector to filter */ 
+    int len,    /* (i) length of vector to filter */ 
+    float *Out, /* (o) the resulting filtered vector */ 
+    float *mem  /* (i/o) the filter state */ 
+){ 
+    int i; 
+    float *pi, *po; 
+ 
+    /* all-zero section*/ 
+ 
+    pi = &In[0]; 
+    po = &Out[0]; 
+    for (i=0; i<len; i++) { 
+        *po = hpi_zero_coefsTbl[0] * (*pi); 
+        *po += hpi_zero_coefsTbl[1] * mem[0]; 
+        *po += hpi_zero_coefsTbl[2] * mem[1]; 
+ 
+        mem[1] = mem[0]; 
+        mem[0] = *pi; 
+        po++; 
+        pi++; 
+ 
+    } 
+ 
+    /* all-pole section*/ 
+ 
+    po = &Out[0]; 
+    for (i=0; i<len; i++) { 
+        *po -= hpi_pole_coefsTbl[1] * mem[2]; 
+        *po -= hpi_pole_coefsTbl[2] * mem[3]; 
+ 
+        mem[3] = mem[2]; 
+        mem[2] = *po; 
+        po++; 
+    } 
+} 
+ 
+