diff options
Diffstat (limited to 'pjmedia/src/pjmedia-codec/ilbc/anaFilter.c')
-rw-r--r-- | pjmedia/src/pjmedia-codec/ilbc/anaFilter.c | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/pjmedia/src/pjmedia-codec/ilbc/anaFilter.c b/pjmedia/src/pjmedia-codec/ilbc/anaFilter.c deleted file mode 100644 index c161f98a..00000000 --- a/pjmedia/src/pjmedia-codec/ilbc/anaFilter.c +++ /dev/null @@ -1,72 +0,0 @@ - - /****************************************************************** - - iLBC Speech Coder ANSI-C Source Code - - anaFilter.c - - Copyright (C) The Internet Society (2004). - All Rights Reserved. - - ******************************************************************/ - - #include <string.h> - #include "iLBC_define.h" - - /*----------------------------------------------------------------* - * LP analysis filter. - *---------------------------------------------------------------*/ - - void anaFilter( - float *In, /* (i) Signal to be filtered */ - float *a, /* (i) LP parameters */ - int len,/* (i) Length of signal */ - float *Out, /* (o) Filtered signal */ - float *mem /* (i/o) Filter state */ - ){ - int i, j; - float *po, *pi, *pm, *pa; - - po = Out; - - /* Filter first part using memory from past */ - - for (i=0; i<LPC_FILTERORDER; i++) { - pi = &In[i]; - pm = &mem[LPC_FILTERORDER-1]; - pa = a; - *po=0.0; - - - - - - for (j=0; j<=i; j++) { - *po+=(*pa++)*(*pi--); - } - for (j=i+1; j<LPC_FILTERORDER+1; j++) { - - *po+=(*pa++)*(*pm--); - } - po++; - } - - /* Filter last part where the state is entirely - in the input vector */ - - for (i=LPC_FILTERORDER; i<len; i++) { - pi = &In[i]; - pa = a; - *po=0.0; - for (j=0; j<LPC_FILTERORDER+1; j++) { - *po+=(*pa++)*(*pi--); - } - po++; - } - - /* Update state vector */ - - memcpy(mem, &In[len-LPC_FILTERORDER], - LPC_FILTERORDER*sizeof(float)); - } - |