logmath.h

Go to the documentation of this file.

/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 2007 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.
 *
 * ====================================================================
 *
 */
#ifndef __LOGMATH_H__
#define __LOGMATH_H__
 
#include <pocketsphinx/export.h>
#include <pocketsphinx/prim_type.h>
 
#ifdef __cplusplus
extern "C" {
#endif
#if 0
/* Fool Emacs. */
}
#endif
 
typedef struct logadd_s logadd_t;
struct logadd_s {
    void *table;
    uint32 table_size;
    uint8 width;
    int8 shift;
};
 
typedef struct logmath_s logmath_t;
 
#define LOGMATH_TABLE(lm) ((logadd_t *)lm)
 
POCKETSPHINX_EXPORT
logmath_t *logmath_init(float64 base, int shift, int use_table);
 
POCKETSPHINX_EXPORT
logmath_t *logmath_read(const char *filename);
 
POCKETSPHINX_EXPORT
int32 logmath_write(logmath_t *lmath, const char *filename);
 
POCKETSPHINX_EXPORT
int32 logmath_get_table_shape(logmath_t *lmath, uint32 *out_size,
                              uint32 *out_width, uint32 *out_shift);
 
POCKETSPHINX_EXPORT
float64 logmath_get_base(logmath_t *lmath);
 
POCKETSPHINX_EXPORT
int logmath_get_zero(logmath_t *lmath);
 
POCKETSPHINX_EXPORT
int logmath_get_width(logmath_t *lmath);
 
POCKETSPHINX_EXPORT
int logmath_get_shift(logmath_t *lmath);
 
POCKETSPHINX_EXPORT
logmath_t *logmath_retain(logmath_t *lmath);
 
POCKETSPHINX_EXPORT
int logmath_free(logmath_t *lmath);
 
POCKETSPHINX_EXPORT
int logmath_add_exact(logmath_t *lmath, int logb_p, int logb_q);
 
POCKETSPHINX_EXPORT
int logmath_add(logmath_t *lmath, int logb_p, int logb_q);
 
POCKETSPHINX_EXPORT
int logmath_log(logmath_t *lmath, float64 p);
 
POCKETSPHINX_EXPORT
float64 logmath_exp(logmath_t *lmath, int logb_p);
 
POCKETSPHINX_EXPORT
int logmath_ln_to_log(logmath_t *lmath, float64 log_p);
 
POCKETSPHINX_EXPORT
float64 logmath_log_to_ln(logmath_t *lmath, int logb_p);
 
POCKETSPHINX_EXPORT
int logmath_log10_to_log(logmath_t *lmath, float64 log_p);
 
POCKETSPHINX_EXPORT
float logmath_log10_to_log_float(logmath_t *lmath, float64 log_p);
 
POCKETSPHINX_EXPORT
float64 logmath_log_to_log10(logmath_t *lmath, int logb_p);
 
POCKETSPHINX_EXPORT
float64 logmath_log_float_to_log10(logmath_t *lmath, float log_p);
 
#ifdef __cplusplus
}
#endif
 
 
#endif /*  __LOGMATH_H__ */