40 lines
1.8 KiB
C
40 lines
1.8 KiB
C
/*
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* iLBC - a library for the iLBC codec
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*
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* LPCdecode.h - The iLBC low bit rate speech codec.
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*
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* Adapted by Steve Underwood <steveu@coppice.org> from the reference
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* iLBC code supplied in RFC3951.
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*
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* Original code Copyright (C) The Internet Society (2004).
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* All changes to produce this version Copyright (C) 2008 by Steve Underwood
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* All Rights Reserved.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: LPCdecode.h,v 1.2 2008/03/06 12:27:37 steveu Exp $
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*/
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#ifndef __iLBC_LPCDECODE_H
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#define __iLBC_LPCDECODE_H
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void LSFinterpolate2a_dec(float *a, /* (o) lpc coefficients for a sub-frame */
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float *lsf1, /* (i) first lsf coefficient vector */
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float *lsf2, /* (i) second lsf coefficient vector */
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float coef, /* (i) interpolation weight */
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int length); /* (i) length of lsf vectors */
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void SimplelsfDEQ(float *lsfdeq, /* (o) dequantized lsf coefficients */
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int *index, /* (i) quantization index */
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int lpc_n); /* (i) number of LPCs */
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void DecoderInterpolateLSF(float *syntdenum, /* (o) synthesis filter coefficients */
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float *weightdenum, /* (o) weighting denumerator coefficients */
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float *lsfdeq, /* (i) dequantized lsf coefficients */
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int length, /* (i) length of lsf coefficient vector */
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ilbc_decode_state_t *iLBCdec_inst); /* (i) the decoder state structure */
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#endif
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