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gecko-dev/media/pocketsphinx/pocketsphinx.h

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/* -*- c-basic-offset:4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 1999-2008 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 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 pocketsphinx.h Main header file for the PocketSphinx decoder.
*/
#ifndef __POCKETSPHINX_H__
#define __POCKETSPHINX_H__
#ifdef __cplusplus
extern "C" {
#endif
#if 0
}
#endif
/* System headers we need. */
#include <stdio.h>
/* SphinxBase headers we need. */
#include <sphinxbase/cmd_ln.h>
#include <sphinxbase/logmath.h>
#include <sphinxbase/fe.h>
#include <sphinxbase/feat.h>
/* PocketSphinx headers (not many of them!) */
#include <pocketsphinx_export.h>
#include <cmdln_macro.h>
#include <ps_lattice.h>
#include <ps_mllr.h>
/**
* PocketSphinx speech recognizer object.
*/
typedef struct ps_decoder_s ps_decoder_t;
#include <ps_search.h>
/**
* PocketSphinx N-best hypothesis iterator object.
*/
typedef struct ps_astar_s ps_nbest_t;
/**
* PocketSphinx segmentation iterator object.
*/
typedef struct ps_seg_s ps_seg_t;
/**
* Sets default grammar and language model if they are not set explicitly and
* are present in the default search path.
*/
POCKETSPHINX_EXPORT void
ps_default_search_args(cmd_ln_t *);
/**
* Initialize the decoder from a configuration object.
*
* @note The decoder retains ownership of the pointer
* <code>config</code>, so you must not attempt to free it manually.
* If you wish to reuse it elsewhere, call cmd_ln_retain() on it.
*
* @param config a command-line structure, as created by
* cmd_ln_parse_r() or cmd_ln_parse_file_r().
*/
POCKETSPHINX_EXPORT
ps_decoder_t *ps_init(cmd_ln_t *config);
/**
* Reinitialize the decoder with updated configuration.
*
* This function allows you to switch the acoustic model, dictionary,
* or other configuration without creating an entirely new decoding
* object.
*
* @note The decoder retains ownership of the pointer
* <code>config</code>, so you must not attempt to free it manually.
* If you wish to reuse it elsewhere, call cmd_ln_retain() on it.
*
* @param ps Decoder.
* @param config An optional new configuration to use. If this is
* NULL, the previous configuration will be reloaded,
* with any changes applied.
* @return 0 for success, <0 for failure.
*/
POCKETSPHINX_EXPORT
int ps_reinit(ps_decoder_t *ps, cmd_ln_t *config);
/**
* Returns the argument definitions used in ps_init().
*
* This is here to avoid exporting global data, which is problematic
* on Win32 and Symbian (and possibly other platforms).
*/
POCKETSPHINX_EXPORT
arg_t const *ps_args(void);
/**
* Retain a pointer to the decoder.
*
* This increments the reference count on the decoder, allowing it to
* be shared between multiple parent objects. In general you will not
* need to use this function, ever. It is mainly here for the
* convenience of scripting language bindings.
*
* @return pointer to retained decoder.
*/
POCKETSPHINX_EXPORT
ps_decoder_t *ps_retain(ps_decoder_t *ps);
/**
* Finalize the decoder.
*
* This releases all resources associated with the decoder, including
* any language models or grammars which have been added to it, and
* the initial configuration object passed to ps_init().
*
* @param ps Decoder to be freed.
* @return New reference count (0 if freed).
*/
POCKETSPHINX_EXPORT
int ps_free(ps_decoder_t *ps);
/**
* Get the configuration object for this decoder.
*
* @return The configuration object for this decoder. The decoder
* retains ownership of this pointer, so you should not
* attempt to free it manually. Use cmd_ln_retain() if you
* wish to reuse it elsewhere.
*/
POCKETSPHINX_EXPORT
cmd_ln_t *ps_get_config(ps_decoder_t *ps);
/**
* Get the log-math computation object for this decoder.
*
* @return The log-math object for this decoder. The decoder retains
* ownership of this pointer, so you should not attempt to
* free it manually. Use logmath_retain() if you wish to
* reuse it elsewhere.
*/
POCKETSPHINX_EXPORT
logmath_t *ps_get_logmath(ps_decoder_t *ps);
/**
* Get the feature extraction object for this decoder.
*
* @return The feature extraction object for this decoder. The
* decoder retains ownership of this pointer, so you should
* not attempt to free it manually. Use fe_retain() if you
* wish to reuse it elsewhere.
*/
POCKETSPHINX_EXPORT
fe_t *ps_get_fe(ps_decoder_t *ps);
/**
* Get the dynamic feature computation object for this decoder.
*
* @return The dynamic feature computation object for this decoder. The
* decoder retains ownership of this pointer, so you should
* not attempt to free it manually. Use feat_retain() if you
* wish to reuse it elsewhere.
*/
POCKETSPHINX_EXPORT
feat_t *ps_get_feat(ps_decoder_t *ps);
/**
* Adapt current acoustic model using a linear transform.
*
* @param mllr The new transform to use, or NULL to update the existing
* transform. The decoder retains ownership of this pointer,
* so you should not attempt to free it manually. Use
* ps_mllr_retain() if you wish to reuse it
* elsewhere.
* @return The updated transform object for this decoder, or
* NULL on failure.
*/
POCKETSPHINX_EXPORT
ps_mllr_t *ps_update_mllr(ps_decoder_t *ps, ps_mllr_t *mllr);
/**
* Reload the pronunciation dictionary from a file.
*
* This function replaces the current pronunciation dictionary with
* the one stored in dictfile. This also causes the active search
* module(s) to be reinitialized, in the same manner as calling
* ps_add_word() with update=TRUE.
*
* @param dictfile Path to dictionary file to load.
* @param fdictfile Path to filler dictionary to load, or NULL to keep
* the existing filler dictionary.
* @param format Format of the dictionary file, or NULL to determine
* automatically (currently unused,should be NULL)
*/
POCKETSPHINX_EXPORT
int ps_load_dict(ps_decoder_t *ps, char const *dictfile,
char const *fdictfile, char const *format);
/**
* Dump the current pronunciation dictionary to a file.
*
* This function dumps the current pronunciation dictionary to a tex
*
* @param dictfile Path to file where dictionary will be written.
* @param format Format of the dictionary file, or NULL for the
* default (text) format (currently unused, should be NULL)
*/
POCKETSPHINX_EXPORT
int ps_save_dict(ps_decoder_t *ps, char const *dictfile, char const *format);
/**
* Add a word to the pronunciation dictionary.
*
* This function adds a word to the pronunciation dictionary and the
* current language model (but, obviously, not to the current FSG if
* FSG mode is enabled). If the word is already present in one or the
* other, it does whatever is necessary to ensure that the word can be
* recognized.
*
* @param word Word string to add.
* @param phones Whitespace-separated list of phoneme strings
* describing pronunciation of <code>word</code>.
* @param update If TRUE, update the search module (whichever one is
* currently active) to recognize the newly added word.
* If adding multiple words, it is more efficient to
* pass FALSE here in all but the last word.
* @return The internal ID (>= 0) of the newly added word, or <0 on
* failure.
*/
POCKETSPHINX_EXPORT
int ps_add_word(ps_decoder_t *ps,
char const *word,
char const *phones,
int update);
/**
* Lookup for the word in the dictionary and return phone transcription
* for it.
*
* @param ps Pocketsphinx decoder
* @param word Word to look for
*
* @return Whitespace-spearated phone string describing the pronunciation of the <code>word</code>
* or NULL if word is not present in the dictionary. The string is
* allocated and must be freed by the user.
*/
POCKETSPHINX_EXPORT
char *ps_lookup_word(ps_decoder_t *ps,
const char *word);
/**
* Decode a raw audio stream.
*
* No headers are recognized in this files. The configuration
* parameters <tt>-samprate</tt> and <tt>-input_endian</tt> are used
* to determine the sampling rate and endianness of the stream,
* respectively. Audio is always assumed to be 16-bit signed PCM.
*
* @param ps Decoder.
* @param rawfh Previously opened file stream.
* @param maxsamps Maximum number of samples to read from rawfh, or -1
* to read until end-of-file.
* @return Number of samples of audio.
*/
POCKETSPHINX_EXPORT
long ps_decode_raw(ps_decoder_t *ps, FILE *rawfh,
long maxsamps);
/**
* Decode a senone score dump file.
*
* @param ps Decoder
* @param fh Previously opened file handle positioned at start of file.
* @return Number of frames read.
*/
POCKETSPHINX_EXPORT
int ps_decode_senscr(ps_decoder_t *ps, FILE *senfh);
/**
* Start processing of the stream of speech. Channel parameters like
* noise-level are maintained for the stream and reused among utterances.
* Times returned in segment iterators are also stream-wide.
*
* @return 0 for success, <0 on error.
*/
POCKETSPHINX_EXPORT
int ps_start_stream(ps_decoder_t *ps);
/**
* Start utterance processing.
*
* This function should be called before any utterance data is passed
* to the decoder. It marks the start of a new utterance and
* reinitializes internal data structures.
*
* @param ps Decoder to be started.
* @return 0 for success, <0 on error.
*/
POCKETSPHINX_EXPORT
int ps_start_utt(ps_decoder_t *ps);
/**
* Decode raw audio data.
*
* @param ps Decoder.
* @param no_search If non-zero, perform feature extraction but don't
* do any recognition yet. This may be necessary if
* your processor has trouble doing recognition in
* real-time.
* @param full_utt If non-zero, this block of data is a full utterance
* worth of data. This may allow the recognizer to
* produce more accurate results.
* @return Number of frames of data searched, or <0 for error.
*/
POCKETSPHINX_EXPORT
int ps_process_raw(ps_decoder_t *ps,
int16 const *data,
size_t n_samples,
int no_search,
int full_utt);
/**
* Decode acoustic feature data.
*
* @param ps Decoder.
* @param no_search If non-zero, perform feature extraction but don't
* do any recognition yet. This may be necessary if
* your processor has trouble doing recognition in
* real-time.
* @param full_utt If non-zero, this block of data is a full utterance
* worth of data. This may allow the recognizer to
* produce more accurate results.
* @return Number of frames of data searched, or <0 for error.
*/
POCKETSPHINX_EXPORT
int ps_process_cep(ps_decoder_t *ps,
mfcc_t **data,
int n_frames,
int no_search,
int full_utt);
/**
* Get the number of frames of data searched.
*
* Note that there is a delay between this and the number of frames of
* audio which have been input to the system. This is due to the fact
* that acoustic features are computed using a sliding window of
* audio, and dynamic features are computed over a sliding window of
* acoustic features.
*
* @param ps Decoder.
* @return Number of frames of speech data which have been recognized
* so far.
*/
POCKETSPHINX_EXPORT
int ps_get_n_frames(ps_decoder_t *ps);
/**
* End utterance processing.
*
* @param ps Decoder.
* @return 0 for success, <0 on error
*/
POCKETSPHINX_EXPORT
int ps_end_utt(ps_decoder_t *ps);
/**
* Get hypothesis string and path score.
*
* @param ps Decoder.
* @param out_best_score Output: path score corresponding to returned string.
* @return String containing best hypothesis at this point in
* decoding. NULL if no hypothesis is available.
*/
POCKETSPHINX_EXPORT
char const *ps_get_hyp(ps_decoder_t *ps, int32 *out_best_score);
/**
* Get hypothesis string and final flag.
*
* @param ps Decoder.
* @param out_is_best_score Output: if hypothesis is reached final state in the grammar.
* @return String containing best hypothesis at this point in
* decoding. NULL if no hypothesis is available.
*/
POCKETSPHINX_EXPORT
char const *ps_get_hyp_final(ps_decoder_t *ps, int32 *out_is_final);
/**
* Get posterior probability.
*
* @note Unless the -bestpath option is enabled, this function will
* always return zero (corresponding to a posterior probability of
* 1.0). Even if -bestpath is enabled, it will also return zero when
* called on a partial result. Ongoing research into effective
* confidence annotation for partial hypotheses may result in these
* restrictions being lifted in future versions.
*
* @param ps Decoder.
* @return Posterior probability of the best hypothesis.
*/
POCKETSPHINX_EXPORT
int32 ps_get_prob(ps_decoder_t *ps);
/**
* Get word lattice.
*
* There isn't much you can do with this so far, a public API will
* appear in the future.
*
* @param ps Decoder.
* @return Word lattice object containing all hypotheses so far. NULL
* if no hypotheses are available. This pointer is owned by
* the decoder and you should not attempt to free it manually.
* It is only valid until the next utterance, unless you use
* ps_lattice_retain() to retain it.
*/
POCKETSPHINX_EXPORT
ps_lattice_t *ps_get_lattice(ps_decoder_t *ps);
/**
* Get an iterator over the word segmentation for the best hypothesis.
*
* @param ps Decoder.
* @param out_best_score Output: path score corresponding to hypothesis.
* @return Iterator over the best hypothesis at this point in
* decoding. NULL if no hypothesis is available.
*/
POCKETSPHINX_EXPORT
ps_seg_t *ps_seg_iter(ps_decoder_t *ps, int32 *out_best_score);
/**
* Get the next segment in a word segmentation.
*
* @param seg Segment iterator.
* @return Updated iterator with the next segment. NULL at end of
* utterance (the iterator will be freed in this case).
*/
POCKETSPHINX_EXPORT
ps_seg_t *ps_seg_next(ps_seg_t *seg);
/**
* Get word string from a segmentation iterator.
*
* @param seg Segment iterator.
* @return Read-only string giving string name of this segment. This
* is only valid until the next call to ps_seg_next().
*/
POCKETSPHINX_EXPORT
char const *ps_seg_word(ps_seg_t *seg);
/**
* Get inclusive start and end frames from a segmentation iterator.
*
* @note These frame numbers are inclusive, i.e. the end frame refers
* to the last frame in which the given word or other segment was
* active. Therefore, the actual duration is *out_ef - *out_sf + 1.
*
* @param seg Segment iterator.
* @param out_sf Output: First frame index in segment.
* @param out_sf Output: Last frame index in segment.
*/
POCKETSPHINX_EXPORT
void ps_seg_frames(ps_seg_t *seg, int *out_sf, int *out_ef);
/**
* Get language, acoustic, and posterior probabilities from a
* segmentation iterator.
*
* @note Unless the -bestpath option is enabled, this function will
* always return zero (corresponding to a posterior probability of
* 1.0). Even if -bestpath is enabled, it will also return zero when
* called on a partial result. Ongoing research into effective
* confidence annotation for partial hypotheses may result in these
* restrictions being lifted in future versions.
*
* @param out_ascr Output: acoustic model score for this segment.
* @param out_lscr Output: language model score for this segment.
* @param out_lback Output: language model backoff mode for this
* segment (i.e. the number of words used in
* calculating lscr). This field is, of course, only
* meaningful for N-Gram models.
* @return Log posterior probability of current segment. Log is
* expressed in the log-base used in the decoder. To convert
* to linear floating-point, use logmath_exp(ps_get_logmath(),
* pprob).
*/
POCKETSPHINX_EXPORT
int32 ps_seg_prob(ps_seg_t *seg, int32 *out_ascr, int32 *out_lscr, int32 *out_lback);
/**
* Finish iterating over a word segmentation early, freeing resources.
*/
POCKETSPHINX_EXPORT
void ps_seg_free(ps_seg_t *seg);
/**
* Get an iterator over the best hypotheses, optionally within a
* selected region of the utterance. Iterator is empty now, it must
* be advanced with ps_nbest_next first. The function may also
* return a NULL which means that there is no hypothesis available for this
* utterance.
*
* @param ps Decoder.
* @param sf Start frame for N-best search (0 for whole utterance)
* @param ef End frame for N-best search (-1 for whole utterance)
* @param ctx1 First word of trigram context (NULL for whole utterance)
* @param ctx2 First word of trigram context (NULL for whole utterance)
* @return Iterator over N-best hypotheses or NULL if no hypothesis is available
*/
POCKETSPHINX_EXPORT
ps_nbest_t *ps_nbest(ps_decoder_t *ps, int sf, int ef,
char const *ctx1, char const *ctx2);
/**
* Move an N-best list iterator forward.
*
* @param nbest N-best iterator.
* @return Updated N-best iterator, or NULL if no more hypotheses are
* available (iterator is freed ni this case).
*/
POCKETSPHINX_EXPORT
ps_nbest_t *ps_nbest_next(ps_nbest_t *nbest);
/**
* Get the hypothesis string from an N-best list iterator.
*
* @param nbest N-best iterator.
* @param out_score Output: Path score for this hypothesis.
* @return String containing next best hypothesis.
*/
POCKETSPHINX_EXPORT
char const *ps_nbest_hyp(ps_nbest_t *nbest, int32 *out_score);
/**
* Get the word segmentation from an N-best list iterator.
*
* @param nbest N-best iterator.
* @param out_score Output: Path score for this hypothesis.
* @return Iterator over the next best hypothesis.
*/
POCKETSPHINX_EXPORT
ps_seg_t *ps_nbest_seg(ps_nbest_t *nbest, int32 *out_score);
/**
* Finish N-best search early, releasing resources.
*
* @param nbest N-best iterator.
*/
POCKETSPHINX_EXPORT
void ps_nbest_free(ps_nbest_t *nbest);
/**
* Get performance information for the current utterance.
*
* @param ps Decoder.
* @param out_nspeech Output: Number of seconds of speech.
* @param out_ncpu Output: Number of seconds of CPU time used.
* @param out_nwall Output: Number of seconds of wall time used.
*/
POCKETSPHINX_EXPORT
void ps_get_utt_time(ps_decoder_t *ps, double *out_nspeech,
double *out_ncpu, double *out_nwall);
/**
* Get overall performance information.
*
* @param ps Decoder.
* @param out_nspeech Output: Number of seconds of speech.
* @param out_ncpu Output: Number of seconds of CPU time used.
* @param out_nwall Output: Number of seconds of wall time used.
*/
POCKETSPHINX_EXPORT
void ps_get_all_time(ps_decoder_t *ps, double *out_nspeech,
double *out_ncpu, double *out_nwall);
/**
* Checks if the last feed audio buffer contained speech
*
* @param ps Decoder.
* @return 1 if last buffer contained speech, 0 - otherwise
*/
POCKETSPHINX_EXPORT
uint8 ps_get_in_speech(ps_decoder_t *ps);
/**
* Sets the limit of the raw audio data to store in decoder
* to retrieve it later on ps_get_rawdata.
*
* @param ps Decoder
* @param size bytes of the utterance to store
*/
POCKETSPHINX_EXPORT
void ps_set_rawdata_size(ps_decoder_t *ps, int32 size);
/**
* Retrieves the raw data collected during utterance decoding.
*
* @param ps Decoder
* @param buffer preallocated buffer to store the data, must be within the limit
* set before
* @param size size of the data collected in samples (not bytes).
*/
POCKETSPHINX_EXPORT
void ps_get_rawdata(ps_decoder_t *ps, int16 **buffer, int32 *size);
/**
* @mainpage PocketSphinx API Documentation
* @author David Huggins-Daines <dhuggins@cs.cmu.edu>
* @version 0.6
* @date March, 2010
*
* @section intro_sec Introduction
*
* This is the API documentation for the PocketSphinx speech
* recognition engine. The main API calls are documented in
* <pocketsphinx.h>.
*/
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* __POCKETSPHINX_H__ */
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