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Diffstat (limited to 'media/libstagefright/codecs/amrnb/common/include/vad1.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/common/include/vad1.h | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/common/include/vad1.h b/media/libstagefright/codecs/amrnb/common/include/vad1.h new file mode 100644 index 0000000..c144ea0 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/common/include/vad1.h @@ -0,0 +1,197 @@ +/* ------------------------------------------------------------------ + * 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_ */ + + |