| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| * express or implied. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * ------------------------------------------------------------------- |
| */ |
| /**************************************************************************************** |
| Portions of this file are derived from the following 3GPP standard: |
| |
| 3GPP TS 26.073 |
| ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec |
| Available from http://www.3gpp.org |
| |
| (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) |
| Permission to distribute, modify and use this file under the standard license |
| terms listed above has been obtained from the copyright holder. |
| ****************************************************************************************/ |
| /* |
| |
| Filename: /audio/gsm_amr/c/include/vad_1.h |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Placed header file in the proper template format. Added |
| parameter pOverflow for the basic math ops. |
| |
| Description: Replaced "int" and/or "char" with OSCL defined types. |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| This file contains all the constant definitions, prototype and structure |
| definitions needed by vad_1.c |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; CONTINUE ONLY IF NOT ALREADY DEFINED |
| ----------------------------------------------------------------------------*/ |
| #ifndef vad_1_h |
| #define vad_1_h "$Id $" |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "typedef.h" |
| #include "cnst_vad.h" |
| |
| /*--------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL VARIABLES REFERENCES |
| ; Declare variables used in this module but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; SIMPLE TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; ENUMERATED TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; STRUCTURES TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| /* state variable */ |
| typedef struct |
| { |
| |
| Word16 bckr_est[COMPLEN]; /* background noise estimate */ |
| Word16 ave_level[COMPLEN]; /* averaged input components for stationary */ |
| /* estimation */ |
| Word16 old_level[COMPLEN]; /* input levels of the previous frame */ |
| Word16 sub_level[COMPLEN]; /* input levels calculated at the end of |
| a frame (lookahead) */ |
| Word16 a_data5[3][2]; /* memory for the filter bank */ |
| Word16 a_data3[5]; /* memory for the filter bank */ |
| |
| Word16 burst_count; /* counts length of a speech burst */ |
| Word16 hang_count; /* hangover counter */ |
| Word16 stat_count; /* stationary counter */ |
| |
| /* Note that each of the following three variables (vadreg, pitch and tone) |
| holds 15 flags. Each flag reserves 1 bit of the variable. The newest |
| flag is in the bit 15 (assuming that LSB is bit 1 and MSB is bit 16). */ |
| Word16 vadreg; /* flags for intermediate VAD decisions */ |
| Word16 pitch; /* flags for pitch detection */ |
| Word16 tone; /* flags for tone detection */ |
| Word16 complex_high; /* flags for complex detection */ |
| Word16 complex_low; /* flags for complex detection */ |
| |
| Word16 oldlag_count, oldlag; /* variables for pitch detection */ |
| |
| Word16 complex_hang_count; /* complex hangover counter, used by VAD */ |
| Word16 complex_hang_timer; /* hangover initiator, used by CAD */ |
| |
| Word16 best_corr_hp; /* FIP filtered value Q15 */ |
| |
| Word16 speech_vad_decision; /* final decision */ |
| Word16 complex_warning; /* complex background warning */ |
| |
| Word16 sp_burst_count; /* counts length of a speech burst incl */ |
| Word16 corr_hp_fast; /* filtered value */ |
| } vadState1; |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| Word16 vad1_init(vadState1 **st); |
| /* initialize one instance of the pre processing state. |
| Stores pointer to filter status struct in *st. This pointer has to |
| be passed to vad in each call. |
| returns 0 on success |
| */ |
| |
| Word16 vad1_reset(vadState1 *st); |
| /* reset of pre processing state (i.e. set state memory to zero) |
| returns 0 on success |
| */ |
| |
| void vad1_exit(vadState1 **st); |
| /* de-initialize pre processing state (i.e. free status struct) |
| stores NULL in *st |
| */ |
| |
| void vad_complex_detection_update(vadState1 *st, /* i/o : State struct */ |
| Word16 best_corr_hp /* i : best Corr Q15 */ |
| ); |
| |
| void vad_tone_detection(vadState1 *st, /* i/o : State struct */ |
| Word32 t0, /* i : autocorrelation maxima */ |
| Word32 t1, /* i : energy */ |
| Flag *pOverflow |
| ); |
| |
| void vad_tone_detection_update( |
| vadState1 *st, /* i/o : State struct */ |
| Word16 one_lag_per_frame, /* i : 1 if one open-loop lag is |
| calculated per each frame, |
| otherwise 0 */ |
| Flag *pOverflow |
| ); |
| |
| void vad_pitch_detection(vadState1 *st, /* i/o : State struct */ |
| Word16 lags[], /* i : speech encoder open loop lags */ |
| Flag *pOverflow |
| ); |
| |
| Word16 vad1(vadState1 *st, /* i/o : State struct */ |
| Word16 in_buf[], /* i : samples of the input frame |
| inbuf[159] is the very last sample, |
| incl lookahead */ |
| Flag *pOverflow |
| ); |
| |
| /*---------------------------------------------------------------------------- |
| ; END |
| ----------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _VAD1_H_ */ |
| |
| |
