From 365b434ae956d192f2983ed9b2d863caa7d2ad75 Mon Sep 17 00:00:00 2001 From: icculus Date: Sun, 1 Jun 2008 18:53:28 +0000 Subject: Added libspeex to revision control, and updated Makefile to use it. git-svn-id: svn://svn.icculus.org/quake3/trunk@1352 edf5b092-35ff-0310-97b2-ce42778d08ea --- code/libspeex/lpc.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 code/libspeex/lpc.h (limited to 'code/libspeex/lpc.h') diff --git a/code/libspeex/lpc.h b/code/libspeex/lpc.h new file mode 100644 index 0000000..952ecdd --- /dev/null +++ b/code/libspeex/lpc.h @@ -0,0 +1,53 @@ +/* Copyright (C) 2002 Jean-Marc Valin */ +/** + @file lpc.h + @brief Functions for LPC (Linear Prediction Coefficients) analysis +*/ +/* + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + - Neither the name of the Xiph.org Foundation nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR + CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#ifndef LPC_H +#define LPC_H + +#include "arch.h" + +void _spx_autocorr( + const spx_word16_t * x, /* in: [0...n-1] samples x */ + spx_word16_t *ac, /* out: [0...lag-1] ac values */ + int lag, int n); + +spx_word32_t /* returns minimum mean square error */ +_spx_lpc( + spx_coef_t * lpc, /* [0...p-1] LPC coefficients */ + const spx_word16_t * ac, /* in: [0...p] autocorrelation values */ + int p + ); + + +#endif -- cgit v1.2.3