FreeCalypso > hg > gsm-codec-lib
view libtwamr/pstfilt.h @ 441:ebe499058c63
libtwamr: implement API functions for RFC 4867 I/O
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 09 May 2024 07:06:31 +0000 |
parents | 59655481e45b |
children |
line wrap: on
line source
/* ******************************************************************************** * * 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 : pstfilt.h * Purpose : Performs adaptive postfiltering on the synthesis * : speech * ******************************************************************************** */ #ifndef pstfilt_h #define pstfilt_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" #include "cnst.h" #include "preemph.h" #include "agc.h" /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ typedef struct{ Word16 res2[L_SUBFR]; Word16 mem_syn_pst[M]; preemphasisState preemph_state; agcState agc_state; Word16 synth_buf[M + L_FRAME]; } Post_FilterState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ void Post_Filter_reset (Post_FilterState *st); /* reset post filter (i.e. set state memory to zero) returns 0 on success */ int Post_Filter ( Post_FilterState *st, /* i/o : post filter states */ enum Mode mode, /* i : AMR mode */ Word16 *syn, /* i/o : synthesis speech (postfiltered is output) */ Word16 *Az_4 /* i : interpolated LPC parameters in all subfr. */ ); /* filters the signal syn using the parameters in Az_4 to calculate filter coefficients. The filter must be set up using Post_Filter_init prior to the first call to Post_Filter. Post_FilterState is updated to mirror the current state of the filter return 0 on success */ #endif