diff options
author | Mark Spencer <markster@digium.com> | 2003-04-15 04:36:52 +0000 |
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committer | Mark Spencer <markster@digium.com> | 2003-04-15 04:36:52 +0000 |
commit | c4da749362b2842ba0478dcdb309c29dd353c795 (patch) | |
tree | 468bcd1944564d1b84b5a9d46b2eb437fe3c73a3 /codecs/ilbc/hpOutput.c | |
parent | dbe00ec2d2029c61ffb7b58ee6184274058767f4 (diff) |
Add iLBC codec
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@852 65c4cc65-6c06-0410-ace0-fbb531ad65f3
Diffstat (limited to 'codecs/ilbc/hpOutput.c')
-rwxr-xr-x | codecs/ilbc/hpOutput.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/codecs/ilbc/hpOutput.c b/codecs/ilbc/hpOutput.c new file mode 100755 index 000000000..fa75f2578 --- /dev/null +++ b/codecs/ilbc/hpOutput.c @@ -0,0 +1,58 @@ + +/****************************************************************** + + iLBC Speech Coder ANSI-C Source Code + + hpOutput.c + + Copyright (c) 2001, + Global IP Sound AB. + All rights reserved. + +******************************************************************/ + +#include "constants.h" + +/*----------------------------------------------------------------* + * Output high-pass filter + *---------------------------------------------------------------*/ + +void hpOutput( + 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 = hpo_zero_coefsTbl[0] * (*pi); + *po += hpo_zero_coefsTbl[1] * mem[0]; + *po += hpo_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 -= hpo_pole_coefsTbl[1] * mem[2]; + *po -= hpo_pole_coefsTbl[2] * mem[3]; + + mem[3] = mem[2]; + mem[2] = *po; + po++; + } +} + + |