diff options
Diffstat (limited to 'media/sphinxbase/src/libsphinxbase/fe/fe_internal.h')
| -rw-r--r-- | media/sphinxbase/src/libsphinxbase/fe/fe_internal.h | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/media/sphinxbase/src/libsphinxbase/fe/fe_internal.h b/media/sphinxbase/src/libsphinxbase/fe/fe_internal.h deleted file mode 100644 index f6c943c72..000000000 --- a/media/sphinxbase/src/libsphinxbase/fe/fe_internal.h +++ /dev/null @@ -1,216 +0,0 @@ -/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */ -/* ==================================================================== - * Copyright (c) 1996-2004 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. - * - * ==================================================================== - * - */ - -#ifndef __FE_INTERNAL_H__ -#define __FE_INTERNAL_H__ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif - -#include "sphinxbase/fe.h" -#include "sphinxbase/fixpoint.h" - -#include "fe_noise.h" -#include "fe_prespch_buf.h" -#include "fe_type.h" - -#ifdef __cplusplus -extern "C" { -#endif -#if 0 -/* Fool Emacs. */ -} -#endif - -/* Values for the 'logspec' field. */ -enum { - RAW_LOG_SPEC = 1, - SMOOTH_LOG_SPEC = 2 -}; - -/* Values for the 'transform' field. */ -enum { - LEGACY_DCT = 0, - DCT_II = 1, - DCT_HTK = 2 -}; - -typedef struct melfb_s melfb_t; -/** Base Struct to hold all structure for MFCC computation. */ -struct melfb_s { - float32 sampling_rate; - int32 num_cepstra; - int32 num_filters; - int32 fft_size; - float32 lower_filt_freq; - float32 upper_filt_freq; - /* DCT coefficients. */ - mfcc_t **mel_cosine; - /* Filter coefficients. */ - mfcc_t *filt_coeffs; - int16 *spec_start; - int16 *filt_start; - int16 *filt_width; - /* Luxury mobile home. */ - int32 doublewide; - char const *warp_type; - char const *warp_params; - uint32 warp_id; - /* Precomputed normalization constants for unitary DCT-II/DCT-III */ - mfcc_t sqrt_inv_n, sqrt_inv_2n; - /* Value and coefficients for HTK-style liftering */ - int32 lifter_val; - mfcc_t *lifter; - /* Normalize filters to unit area */ - int32 unit_area; - /* Round filter frequencies to DFT points (hurts accuracy, but is - useful for legacy purposes) */ - int32 round_filters; -}; - -typedef struct ringbuf_s { - powspec_t** bufs; - int16 buf_num; - int32 buf_len; - int16 start; - int16 end; - int32 recs; -} ringbuf_t; - -/* sqrt(1/2), also used for unitary DCT-II/DCT-III */ -#define SQRT_HALF FLOAT2MFCC(0.707106781186548) - -typedef struct vad_data_s { - uint8 global_state; - uint8 state_changed; - uint8 store_pcm; - int16 prespch_num; - int16 postspch_num; - prespch_buf_t* prespch_buf; -} vad_data_t; - -/** Structure for the front-end computation. */ -struct fe_s { - cmd_ln_t *config; - int refcount; - - int16 prespch_len; - int16 postspch_len; - float32 vad_threshold; - - float32 sampling_rate; - int16 frame_rate; - int16 frame_shift; - - float32 window_length; - int16 frame_size; - int16 fft_size; - - uint8 fft_order; - uint8 feature_dimension; - uint8 num_cepstra; - uint8 remove_dc; - uint8 log_spec; - uint8 swap; - uint8 dither; - uint8 transform; - uint8 remove_noise; - uint8 remove_silence; - - float32 pre_emphasis_alpha; - int32 seed; - - size_t sample_counter; - uint8 start_flag; - uint8 reserved; - - /* Twiddle factors for FFT. */ - frame_t *ccc, *sss; - /* Mel filter parameters. */ - melfb_t *mel_fb; - /* Half of a Hamming Window. */ - window_t *hamming_window; - /* Storage for noise removal */ - noise_stats_t *noise_stats; - - /* Storage for VAD variables */ - vad_data_t *vad_data; - - /* Temporary buffers for processing. */ - /* FIXME: too many of these. */ - int16 *spch; - frame_t *frame; - powspec_t *spec, *mfspec; - int16 *overflow_samps; - int16 num_overflow_samps; - int16 prior; -}; - -void fe_init_dither(int32 seed); - -/* Apply 1/2 bit noise to a buffer of audio. */ -int32 fe_dither(int16 *buffer, int32 nsamps); - -/* Load a frame of data into the fe. */ -int fe_read_frame(fe_t *fe, int16 const *in, int32 len); - -/* Shift the input buffer back and read more data. */ -int fe_shift_frame(fe_t *fe, int16 const *in, int32 len); - -/* Process a frame of data into features. */ -void fe_write_frame(fe_t *fe, mfcc_t *fea); - -/* Initialization functions. */ -int32 fe_build_melfilters(melfb_t *MEL_FB); -int32 fe_compute_melcosine(melfb_t *MEL_FB); -void fe_create_hamming(window_t *in, int32 in_len); -void fe_create_twiddle(fe_t *fe); - -fixed32 fe_log_add(fixed32 x, fixed32 y); -fixed32 fe_log_sub(fixed32 x, fixed32 y); - -/* Miscellaneous processing functions. */ -void fe_spec2cep(fe_t * fe, const powspec_t * mflogspec, mfcc_t * mfcep); -void fe_dct2(fe_t *fe, const powspec_t *mflogspec, mfcc_t *mfcep, int htk); -void fe_dct3(fe_t *fe, const mfcc_t *mfcep, powspec_t *mflogspec); - -#ifdef __cplusplus -} -#endif - -#endif /* __FE_INTERNAL_H__ */ |