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Diffstat (limited to 'media/pocketsphinx/src/tied_mgau_common.h')
| -rw-r--r-- | media/pocketsphinx/src/tied_mgau_common.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/media/pocketsphinx/src/tied_mgau_common.h b/media/pocketsphinx/src/tied_mgau_common.h new file mode 100644 index 000000000..c8c532084 --- /dev/null +++ b/media/pocketsphinx/src/tied_mgau_common.h @@ -0,0 +1,121 @@ +/* -*- 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__ */ |