198 lines
8.5 KiB
C
198 lines
8.5 KiB
C
/* ------------------------------------------------------------------
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* Copyright (C) 1998-2009 PacketVideo
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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
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* express or implied.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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* -------------------------------------------------------------------
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*/
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/****************************************************************************************
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Portions of this file are derived from the following 3GPP standard:
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3GPP TS 26.073
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ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
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Available from http://www.3gpp.org
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(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
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Permission to distribute, modify and use this file under the standard license
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terms listed above has been obtained from the copyright holder.
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****************************************************************************************/
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/*
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Filename: /audio/gsm_amr/c/include/vad_1.h
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------------------------------------------------------------------------------
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REVISION HISTORY
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Description: Placed header file in the proper template format. Added
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parameter pOverflow for the basic math ops.
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Description: Replaced "int" and/or "char" with OSCL defined types.
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Description: Moved _cplusplus #ifdef after Include section.
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Description:
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------------------------------------------------------------------------------
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INCLUDE DESCRIPTION
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This file contains all the constant definitions, prototype and structure
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definitions needed by vad_1.c
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------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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; CONTINUE ONLY IF NOT ALREADY DEFINED
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----------------------------------------------------------------------------*/
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#ifndef vad_1_h
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#define vad_1_h "$Id $"
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/*----------------------------------------------------------------------------
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; INCLUDES
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----------------------------------------------------------------------------*/
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#include "typedef.h"
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#include "cnst_vad.h"
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/*--------------------------------------------------------------------------*/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*----------------------------------------------------------------------------
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; MACROS
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; Define module specific macros here
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; DEFINES
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; Include all pre-processor statements here.
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; EXTERNAL VARIABLES REFERENCES
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; Declare variables used in this module but defined elsewhere
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; SIMPLE TYPEDEF'S
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; ENUMERATED TYPEDEF'S
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; STRUCTURES TYPEDEF'S
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----------------------------------------------------------------------------*/
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/* state variable */
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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
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a frame (lookahead) */
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Word16 a_data5[3][2]; /* memory for the filter bank */
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Word16 a_data3[5]; /* 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 three variables (vadreg, pitch and tone)
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holds 15 flags. Each flag reserves 1 bit of the variable. The newest
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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 pitch; /* flags for pitch detection */
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Word16 tone; /* flags for tone detection */
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Word16 complex_high; /* flags for complex detection */
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Word16 complex_low; /* flags for complex detection */
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Word16 oldlag_count, oldlag; /* variables for pitch detection */
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Word16 complex_hang_count; /* complex hangover counter, used by VAD */
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Word16 complex_hang_timer; /* hangover initiator, used by CAD */
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Word16 best_corr_hp; /* FIP filtered value Q15 */
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Word16 speech_vad_decision; /* final decision */
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Word16 complex_warning; /* complex background warning */
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Word16 sp_burst_count; /* counts length of a speech burst incl */
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Word16 corr_hp_fast; /* filtered value */
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} vadState1;
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/*----------------------------------------------------------------------------
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; GLOBAL FUNCTION DEFINITIONS
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; Function Prototype declaration
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----------------------------------------------------------------------------*/
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Word16 vad1_init(vadState1 **st);
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/* initialize one instance of the pre processing state.
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Stores pointer to filter status struct in *st. This pointer has to
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be passed to vad in each call.
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returns 0 on success
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*/
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Word16 vad1_reset(vadState1 *st);
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/* reset of pre processing state (i.e. set state memory to zero)
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returns 0 on success
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*/
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void vad1_exit(vadState1 **st);
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/* de-initialize pre processing state (i.e. free status struct)
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stores NULL in *st
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*/
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void vad_complex_detection_update(vadState1 *st, /* i/o : State struct */
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Word16 best_corr_hp /* i : best Corr Q15 */
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);
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void vad_tone_detection(vadState1 *st, /* i/o : State struct */
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Word32 t0, /* i : autocorrelation maxima */
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Word32 t1, /* i : energy */
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Flag *pOverflow
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);
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void vad_tone_detection_update(
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vadState1 *st, /* i/o : State struct */
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Word16 one_lag_per_frame, /* i : 1 if one open-loop lag is
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calculated per each frame,
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otherwise 0 */
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Flag *pOverflow
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);
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void vad_pitch_detection(vadState1 *st, /* i/o : State struct */
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Word16 lags[], /* i : speech encoder open loop lags */
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Flag *pOverflow
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);
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Word16 vad1(vadState1 *st, /* i/o : State struct */
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Word16 in_buf[], /* i : samples of the input frame
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inbuf[159] is the very last sample,
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incl lookahead */
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Flag *pOverflow
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);
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/*----------------------------------------------------------------------------
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; END
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----------------------------------------------------------------------------*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* _VAD1_H_ */
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