/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */ /* ==================================================================== * Copyright (c) 1999-2010 Carnegie Mellon University. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. 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. * * This work was supported in part by funding from the Defense Advanced * Research Projects Agency and the National Science Foundation of the * United States of America, and the CMU Sphinx Speech Consortium. * * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND * ANY EXPRESSED 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 CARNEGIE MELLON UNIVERSITY * NOR ITS EMPLOYEES 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. * * ==================================================================== * */ /** * @file tied_mgau_common.h * @brief Common code shared between SC and PTM (tied-state) models. */ #ifndef __TIED_MGAU_COMMON_H__ #define __TIED_MGAU_COMMON_H__ #include <sphinxbase/logmath.h> #include <sphinxbase/fixpoint.h> #define MGAU_MIXW_VERSION "1.0" /* Sphinx-3 file format version for mixw */ #define MGAU_PARAM_VERSION "1.0" /* Sphinx-3 file format version for mean/var */ #define NONE -1 #define WORST_DIST (int32)(0x80000000) /** Subtract GMM component b (assumed to be positive) and saturate */ #ifdef FIXED_POINT #define GMMSUB(a,b) \ (((a)-(b) > a) ? (INT_MIN) : ((a)-(b))) /** Add GMM component b (assumed to be positive) and saturate */ #define GMMADD(a,b) \ (((a)+(b) < a) ? (INT_MAX) : ((a)+(b))) #else #define GMMSUB(a,b) ((a)-(b)) #define GMMADD(a,b) ((a)+(b)) #endif #ifndef MIN #define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) #define LOGMATH_INLINE static inline #elif defined(_MSC_VER) #define LOGMATH_INLINE __inline #else #define LOGMATH_INLINE static #endif /* Allocate 0..159 for negated quantized mixture weights and 0..96 for * negated normalized acoustic scores, so that the combination of the * two (for a single mixture) can never exceed 255. */ #define MAX_NEG_MIXW 159 /**< Maximum negated mixture weight value. */ #define MAX_NEG_ASCR 96 /**< Maximum negated acoustic score value. */ /** * Quickly log-add two negated log probabilities. * * @param lmath The log-math object * @param mlx A negative log probability (0 < mlx < 255) * @param mly A negative log probability (0 < mly < 255) * @return -log(exp(-mlx)+exp(-mly)) * * We can do some extra-fast log addition since we know that * mixw+ascr is always less than 256 and hence x-y is also always less * than 256. This relies on some cooperation from logmath_t which * will never produce a logmath table smaller than 256 entries. * * Note that the parameters are *negated* log probabilities (and * hence, are positive numbers), as is the return value. This is the * key to the "fastness" of this function. */ LOGMATH_INLINE int fast_logmath_add(logmath_t *lmath, int mlx, int mly) { logadd_t *t = LOGMATH_TABLE(lmath); int d, r; /* d must be positive, obviously. */ if (mlx > mly) { d = (mlx - mly); r = mly; } else { d = (mly - mlx); r = mlx; } return r - (((uint8 *)t->table)[d]); } #endif /* __TIED_MGAU_COMMON_H__ */