gecko/media/pocketsphinx/ps_search.h

297 lines
8.6 KiB
C

/* -*- c-basic-offset:4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 2014 Alpha Cephei Inc.. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
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*
* 1. Redistributions of source code must retain the above copyright
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*
* 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 SOFTWARE IS PROVIDED BY ALPHA CEPHEI INC. ``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
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* ====================================================================
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/**
* @file ps_search.h User can configure several "search" objects with
* different grammars and langauge models and switch them in runtime to
* provide interactive experience for the user.
*
* There are different possible search modes:
*
* <ul>
* <li>keyword - efficiently looks for keyphrase and ignores other speech. allows to configure detection threshold.</li>
* <li>grammar - recognizes speech according to JSGF grammar. Unlike keyphrase grammar search doesn't ignore words which are not in grammar but tries to recognize them.</li>
* <li>ngram/lm - recognizes natural speech with a language model.</li>
* <li>allphone - recognizes phonemes with a phonetic language model.</li>
* </ul>
*
* Each search has a name and can be referenced by a name, names are
* application-specific. The function ps_set_search allows to activate
* the search previously added by a name.
*
* To add the search one needs to point to the grammar/language model
* describing the search. The location of the grammar is specific to the
* application.
*
* The exact design of a searches depends on your application. For
* example, you might want to listen for activation keyword first and once
* keyword is recognized switch to ngram search to recognize actual
* command. Once you recognized the command you can switch to grammar
* search to recognize the confirmation and then switch back to keyword listening
* mode to wait for another command.
*
* If only a simple recognition is required it is sufficient to add a single search or
* just configure the required mode with configuration options.
*/
#ifndef __PS_SEARCH_H__
#define __PS_SEARCH_H__
#ifdef __cplusplus
extern "C" {
#endif
#include <sphinxbase/fsg_model.h>
#include <sphinxbase/ngram_model.h>
/**
* PocketSphinx search iterator.
*/
typedef struct ps_search_iter_s ps_search_iter_t;
/**
* Actives search with the provided name.
*
* Activates search with the provided name. The search must be added before
* using either ps_set_fsg(), ps_set_lm() or ps_set_kws().
*
* @return 0 on success, 1 on failure
*/
POCKETSPHINX_EXPORT
int ps_set_search(ps_decoder_t *ps, const char *name);
/**
* Returns name of curent search in decoder
*
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
const char* ps_get_search(ps_decoder_t *ps);
/**
* Unsets the search and releases related resources.
*
* Unsets the search previously added with
* using either ps_set_fsg(), ps_set_lm() or ps_set_kws().
*
* @see ps_set_fsg
* @see ps_set_lm
* @see ps_set_kws
*/
POCKETSPHINX_EXPORT
int ps_unset_search(ps_decoder_t *ps, const char *name);
/**
* Returns iterator over current searches
*
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
ps_search_iter_t *ps_search_iter(ps_decoder_t *ps);
/**
* Updates search iterator to point to the next position.
*
* This function automatically frees the iterator object upon reaching
* the final entry.
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
ps_search_iter_t *ps_search_iter_next(ps_search_iter_t *itor);
/**
* Retrieves the name of the search the iterator points to.
*
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
const char* ps_search_iter_val(ps_search_iter_t *itor);
/**
* Delete an unfinished search iterator
*
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
void ps_search_iter_free(ps_search_iter_t *itor);
/**
* Updates search iterator to point to the next position.
*
* This function automatically frees the iterator object upon reaching
* the final entry.
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
const char* ps_search_iter_val(ps_search_iter_t *itor);
/**
* Get the language model set object for this decoder.
*
* If N-Gram decoding is not enabled, this will return NULL. You will
* need to enable it using ps_set_lmset().
*
* @return The language model set object for this decoder. The
* decoder retains ownership of this pointer, so you should
* not attempt to free it manually. Use ngram_model_retain()
* if you wish to reuse it elsewhere.
*/
POCKETSPHINX_EXPORT
ngram_model_t *ps_get_lm(ps_decoder_t *ps, const char *name);
/**
* Adds new search based on N-gram language model.
*
* Associates N-gram search with the provided name. The search can be activated
* using ps_set_search().
*
* @see ps_set_search.
*/
POCKETSPHINX_EXPORT
int ps_set_lm(ps_decoder_t *ps, const char *name, ngram_model_t *lm);
/**
* Adds new search based on N-gram language model.
*
* Convenient method to load N-gram model and create a search.
*
* @see ps_set_lm
*/
POCKETSPHINX_EXPORT
int ps_set_lm_file(ps_decoder_t *ps, const char *name, const char *path);
/**
* Get the finite-state grammar set object for this decoder.
*
* If FSG decoding is not enabled, this returns NULL. Call
* ps_set_fsgset() to enable it.
*
* @return The current FSG set object for this decoder, or
* NULL if none is available.
*/
POCKETSPHINX_EXPORT
fsg_model_t *ps_get_fsg(ps_decoder_t *ps, const char *name);
/**
* Adds new search based on finite state grammar.
*
* Associates FSG search with the provided name. The search can be activated
* using ps_set_search().
*
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
int ps_set_fsg(ps_decoder_t *ps, const char *name, fsg_model_t *fsg);
/**
* Adds new search using JSGF model.
*
* Convenient method to load JSGF model and create a search.
*
* @see ps_set_fsg
*/
POCKETSPHINX_EXPORT
int ps_set_jsgf_file(ps_decoder_t *ps, const char *name, const char *path);
/**
* Adds new search using JSGF model.
*
* Convenience method to parse JSGF model from string and create a search.
*
* @see ps_set_fsg
*/
POCKETSPHINX_EXPORT
int ps_set_jsgf_string(ps_decoder_t *ps, const char *name, const char *jsgf_string);
/**
* Get the current Key phrase to spot
*
* If KWS is not enabled, this returns NULL. Call
* ps_update_kws() to enable it.
*
* @return The current keyphrase to spot
*/
POCKETSPHINX_EXPORT
const char* ps_get_kws(ps_decoder_t *ps, const char *name);
/**
* Adds keywords from a file to spotting
*
* Associates KWS search with the provided name. The search can be activated
* using ps_set_search().
*
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
int ps_set_kws(ps_decoder_t *ps, const char *name, const char *keyfile);
/**
* Adds new keyword to spot
*
* Associates KWS search with the provided name. The search can be activated
* using ps_set_search().
*
* @see ps_set_search
*/
POCKETSPHINX_EXPORT
int ps_set_keyphrase(ps_decoder_t *ps, const char *name, const char *keyphrase);
/**
* Adds new search based on phone N-gram language model.
*
* Associates N-gram search with the provided name. The search can be activated
* using ps_set_search().
*
* @see ps_set_search.
*/
POCKETSPHINX_EXPORT
int ps_set_allphone(ps_decoder_t *ps, const char *name, ngram_model_t *lm);
/**
* Adds new search based on phone N-gram language model.
*
* Convenient method to load N-gram model and create a search.
*
* @see ps_set_allphone
*/
POCKETSPHINX_EXPORT
int ps_set_allphone_file(ps_decoder_t *ps, const char *name, const char *path);
#ifdef __cplusplus
}
#endif
#endif /* __PS_SEARCH_H__ */