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view libtwamr/vad1.h @ 480:332397bc80aa
doc/AMR-library-API: document public const data items
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 19 May 2024 23:18:17 +0000 |
parents | 8847c1740e78 |
children |
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/* ******************************************************************************** **-------------------------------------------------------------------------** ** ** ** GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 ** ** R99 Version 3.3.0 ** ** REL-4 Version 4.1.0 ** ** ** **-------------------------------------------------------------------------** ******************************************************************************** * * File : vad1.h * Purpose : Voice Activity Detection (VAD) for AMR (option 1) * ******************************************************************************** */ #ifndef vad1_h #define vad1_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "typedef.h" #include "cnst_vad.h" /* ******************************************************************************** * LOCAL VARIABLES AND TABLES ******************************************************************************** */ /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ /* 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 HO addition */ Word16 corr_hp_fast; /* filtered value */ } vadState1; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ void vad1_reset (vadState1 *st); /* reset of pre processing state (i.e. set state memory to zero) returns 0 on success */ 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 */ ); 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 */ ); void vad_pitch_detection (vadState1 *st, /* i/o : State struct */ Word16 lags[] /* i : speech encoder open loop lags */ ); 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 */ ); #endif