SphinxBase 5prealpha
fe_prespch_buf.h
1/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
2/* ====================================================================
3 * Copyright (c) 2013 Carnegie Mellon University. All rights
4 * reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * This work was supported in part by funding from the Defense Advanced
19 * Research Projects Agency and the National Science Foundation of the
20 * United States of America, and the CMU Sphinx Speech Consortium.
21 *
22 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
23 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
26 * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * ====================================================================
35 *
36 */
37
38/* Buffer that maintains both features and raw audio for the VAD implementation */
39
40#ifndef FE_INTERNAL_H
41#define FE_INTERNAL_H
42
43#include "sphinxbase/fe.h"
44
45typedef struct prespch_buf_s prespch_buf_t;
46
47/* Creates prespeech buffer */
48prespch_buf_t *fe_prespch_init(int num_frames, int num_cepstra,
49 int num_samples);
50
51/* Reads mfcc frame from prespeech buffer */
52int fe_prespch_read_cep(prespch_buf_t * prespch_buf, mfcc_t * fea);
53
54/* Writes mfcc frame to prespeech buffer */
55void fe_prespch_write_cep(prespch_buf_t * prespch_buf, mfcc_t * fea);
56
57/* Reads pcm frame from prespeech buffer */
58void fe_prespch_read_pcm(prespch_buf_t * prespch_buf, int16 *samples,
59 int32 * samples_num);
60
61/* Writes pcm frame to prespeech buffer */
62void fe_prespch_write_pcm(prespch_buf_t * prespch_buf, int16 * samples);
63
64/* Resets read/write pointers for cepstrum buffer */
65void fe_prespch_reset_cep(prespch_buf_t * prespch_buf);
66
67/* Resets read/write pointer for pcm audio buffer */
68void fe_prespch_reset_pcm(prespch_buf_t * prespch_buf);
69
70/* Releases prespeech buffer */
71void fe_prespch_free(prespch_buf_t * prespch_buf);
72
73/* Returns number of accumulated frames */
74int32 fe_prespch_ncep(prespch_buf_t * prespch_buf);
75
76#endif /* FE_INTERNAL_H */