79 lines
3.6 KiB
C
79 lines
3.6 KiB
C
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/*
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** Copyright 2003-2010, VisualOn, Inc.
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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/*-------------------------------------------------------------------*
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* WB_VAD.H *
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*-------------------------------------------------------------------*
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* Functions and static memory for Voice Activity Detection. *
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*-------------------------------------------------------------------*/
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#ifndef __WB_VAD_H__
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#define __WB_VAD_H__
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/******************************************************************************
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* INCLUDE FILES
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******************************************************************************/
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#include "typedef.h"
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#include "wb_vad_c.h"
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#include "voMem.h"
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/******************************************************************************
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* DEFINITION OF DATA TYPES
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******************************************************************************/
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typedef struct
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{
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Word16 bckr_est[COMPLEN]; /* background noise estimate */
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Word16 ave_level[COMPLEN]; /* averaged input components for stationary */
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/* estimation */
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Word16 old_level[COMPLEN]; /* input levels of the previous frame */
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Word16 sub_level[COMPLEN]; /* input levels calculated at the end of a frame (lookahead) */
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Word16 a_data5[F_5TH_CNT][2]; /* memory for the filter bank */
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Word16 a_data3[F_3TH_CNT]; /* memory for the filter bank */
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Word16 burst_count; /* counts length of a speech burst */
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Word16 hang_count; /* hangover counter */
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Word16 stat_count; /* stationary counter */
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/* Note that each of the following two variables holds 15 flags. Each flag reserves 1 bit of the
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* variable. The newest flag is in the bit 15 (assuming that LSB is bit 1 and MSB is bit 16). */
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Word16 vadreg; /* flags for intermediate VAD decisions */
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Word16 tone_flag; /* tone detection flags */
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Word16 sp_est_cnt; /* counter for speech level estimation */
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Word16 sp_max; /* maximum level */
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Word16 sp_max_cnt; /* counts frames that contains speech */
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Word16 speech_level; /* estimated speech level */
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Word32 prev_pow_sum; /* power of previous frame */
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} VadVars;
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/********************************************************************************
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*
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* DECLARATION OF PROTOTYPES
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********************************************************************************/
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Word16 wb_vad_init(VadVars ** st, VO_MEM_OPERATOR *pMemOP);
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Word16 wb_vad_reset(VadVars * st);
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void wb_vad_exit(VadVars ** st, VO_MEM_OPERATOR *pMemOP);
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void wb_vad_tone_detection(VadVars * st, Word16 p_gain);
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Word16 wb_vad(VadVars * st, Word16 in_buf[]);
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#endif //__WB_VAD_H__
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