16adf6de8c
This patch includes the iLBC source code for distribution with Asterisk. Clarification regarding the iLBC source code was provided by Google, and the appropriate licenses have been included in the codecs/ilbc folder. Review: https://reviewboard.asterisk.org/r/1675 Review: https://reviewboard.asterisk.org/r/1649 (closes issue: ASTERISK-18943) Reporter: Leif Madsen Tested by: Matt Jordan ........ Merged revisions 351450 from http://svn.asterisk.org/svn/asterisk/branches/1.8 ........ Merged revisions 351451 from http://svn.asterisk.org/svn/asterisk/branches/10 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@351452 65c4cc65-6c06-0410-ace0-fbb531ad65f3
81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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filter.h
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Copyright (C) The Internet Society (2004).
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All Rights Reserved.
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******************************************************************/
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#ifndef __iLBC_FILTER_H
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#define __iLBC_FILTER_H
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void AllPoleFilter(
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float *InOut, /* (i/o) on entrance InOut[-orderCoef] to
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InOut[-1] contain the state of the
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filter (delayed samples). InOut[0] to
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InOut[lengthInOut-1] contain the filter
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input, on en exit InOut[-orderCoef] to
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InOut[-1] is unchanged and InOut[0] to
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InOut[lengthInOut-1] contain filtered
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samples */
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float *Coef,/* (i) filter coefficients, Coef[0] is assumed
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to be 1.0 */
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int lengthInOut,/* (i) number of input/output samples */
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int orderCoef /* (i) number of filter coefficients */
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);
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void AllZeroFilter(
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float *In, /* (i) In[0] to In[lengthInOut-1] contain
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filter input samples */
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float *Coef,/* (i) filter coefficients (Coef[0] is assumed
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to be 1.0) */
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int lengthInOut,/* (i) number of input/output samples */
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int orderCoef, /* (i) number of filter coefficients */
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float *Out /* (i/o) on entrance Out[-orderCoef] to Out[-1]
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contain the filter state, on exit Out[0]
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to Out[lengthInOut-1] contain filtered
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samples */
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);
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void ZeroPoleFilter(
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float *In, /* (i) In[0] to In[lengthInOut-1] contain filter
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input samples In[-orderCoef] to In[-1]
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contain state of all-zero section */
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float *ZeroCoef,/* (i) filter coefficients for all-zero
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section (ZeroCoef[0] is assumed to
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be 1.0) */
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float *PoleCoef,/* (i) filter coefficients for all-pole section
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(ZeroCoef[0] is assumed to be 1.0) */
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int lengthInOut,/* (i) number of input/output samples */
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int orderCoef, /* (i) number of filter coefficients */
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float *Out /* (i/o) on entrance Out[-orderCoef] to Out[-1]
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contain state of all-pole section. On
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exit Out[0] to Out[lengthInOut-1]
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contain filtered samples */
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);
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void DownSample (
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float *In, /* (i) input samples */
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float *Coef, /* (i) filter coefficients */
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int lengthIn, /* (i) number of input samples */
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float *state, /* (i) filter state */
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float *Out /* (o) downsampled output */
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);
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#endif
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