fe_prespch_buf.h

/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 2013 Carnegie Mellon University.  All rights 
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 * 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.
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/* Buffer that maintains both features and raw audio for the VAD implementation */

#ifndef FE_INTERNAL_H
#define FE_INTERNAL_H

#include "sphinxbase/fe.h"

typedef struct prespch_buf_s prespch_buf_t;

/* Creates prespeech buffer */
prespch_buf_t *fe_prespch_init(int num_frames, int num_cepstra,
                               int num_samples);

/* Reads mfcc frame from prespeech buffer */
int fe_prespch_read_cep(prespch_buf_t * prespch_buf, mfcc_t * fea);

/* Writes mfcc frame to prespeech buffer */
void fe_prespch_write_cep(prespch_buf_t * prespch_buf, mfcc_t * fea);

/* Reads pcm frame from prespeech buffer */
void fe_prespch_read_pcm(prespch_buf_t * prespch_buf, int16 *samples,
                         int32 * samples_num);

/* Writes pcm frame to prespeech buffer */
void fe_prespch_write_pcm(prespch_buf_t * prespch_buf, int16 * samples);

/* Resets read/write pointers for cepstrum buffer */
void fe_prespch_reset_cep(prespch_buf_t * prespch_buf);

/* Resets read/write pointer for pcm audio buffer */
void fe_prespch_reset_pcm(prespch_buf_t * prespch_buf);

/* Releases prespeech buffer */
void fe_prespch_free(prespch_buf_t * prespch_buf);

/* Returns number of accumulated frames */
int32 fe_prespch_ncep(prespch_buf_t * prespch_buf);

#endif                          /* FE_INTERNAL_H */