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Diffstat (limited to 'media/pocketsphinx/src/phone_loop_search.h')
| -rw-r--r-- | media/pocketsphinx/src/phone_loop_search.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/media/pocketsphinx/src/phone_loop_search.h b/media/pocketsphinx/src/phone_loop_search.h new file mode 100644 index 000000000..db776e9b1 --- /dev/null +++ b/media/pocketsphinx/src/phone_loop_search.h @@ -0,0 +1,102 @@ +/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */ +/* ==================================================================== + * Copyright (c) 2008 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 phone_loop_search.h Fast and rough context-independent + * phoneme loop search. + * + * This exists for the purposes of phoneme lookahead, and thus it + * actually does not do phoneme recognition (it wouldn't be very + * accurate anyway). + */ + +#ifndef __PHONE_LOOP_SEARCH_H__ +#define __PHONE_LOOP_SEARCH_H__ + +/* SphinxBase headers. */ +#include <sphinxbase/cmd_ln.h> +#include <sphinxbase/logmath.h> +#include <sphinxbase/ngram_model.h> +#include <sphinxbase/listelem_alloc.h> + +/* Local headers. */ +#include "pocketsphinx_internal.h" +#include "hmm.h" + +/** + * Renormalization event. + */ +struct phone_loop_renorm_s { + int frame_idx; /**< Frame of renormalization. */ + int32 norm; /**< Normalization constant. */ +}; +typedef struct phone_loop_renorm_s phone_loop_renorm_t; + +/** + * Phone loop search structure. + */ +struct phone_loop_search_s { + ps_search_t base; /**< Base search structure. */ + hmm_t *hmms; /**< Basic HMM structures for CI phones. */ + hmm_context_t *hmmctx; /**< HMM context structure. */ + int16 frame; /**< Current frame being searched. */ + int16 n_phones; /**< Size of phone array. */ + int32 **pen_buf; /**< Penalty buffer */ + int16 pen_buf_ptr; /**< Pointer for frame to fill in penalty buffer */ + int32 *penalties; /**< Penalties for CI phones in current frame */ + float64 penalty_weight; /**< Weighting factor for penalties */ + + int32 best_score; /**< Best Viterbi score in current frame. */ + int32 beam; /**< HMM pruning beam width. */ + int32 pbeam; /**< Phone exit pruning beam width. */ + int32 pip; /**< Phone insertion penalty ("language score"). */ + int window; /**< Window size for phoneme lookahead */ + glist_t renorm; /**< List of renormalizations. */ +}; +typedef struct phone_loop_search_s phone_loop_search_t; + +ps_search_t *phone_loop_search_init(cmd_ln_t *config, + acmod_t *acmod, + dict_t *dict); + +/** + * Return lookahead heuristic score for a specific phone. + */ +#define phone_loop_search_score(pls,ci) \ + ((pls == NULL) ? 0 : (pls->penalties[ci])) + +#endif /* __PHONE_LOOP_SEARCH_H__ */ |