FreeCalypso > hg > gsm-codec-lib
diff libtwamr/int_lsf.h @ 382:693ea1d5cf1e
libtwamr: integrate int_lsf.c
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Mon, 06 May 2024 05:45:31 +0000 |
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| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtwamr/int_lsf.h Mon May 06 05:45:31 2024 +0000 @@ -0,0 +1,63 @@ +/* +******************************************************************************** +* +* 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 : int_lsf.h +* Purpose : Interpolates the LSFs +* +******************************************************************************** +*/ +#ifndef int_lsf_h +#define int_lsf_h "$Id $" + +/* +******************************************************************************** +* INCLUDE FILES +******************************************************************************** +*/ +#include "typedef.h" + +/* +******************************************************************************** +* DEFINITION OF DATA TYPES +******************************************************************************** +*/ + +/* +******************************************************************************** +* DECLARATION OF PROTOTYPES +******************************************************************************** +*/ + +/* +************************************************************************** +* +* Function : Int_lsf +* Purpose : Interpolates the LSFs for selected subframe +* Description : The 20 ms speech frame is divided into 4 subframes. +* The LSFs are interpolated at the 1st, 2nd and 3rd +* subframe and only forwarded at the 4th subframe. +* +* |------|------|------|------| +* sf1 sf2 sf3 sf4 +* F0 F1 +* +* sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 +* sf2: 1/2 F0 + 1/2 F1 sf4: F1 +* Returns : void +* +************************************************************************** +*/ +void Int_lsf ( + Word16 lsf_old[], /* i : LSF vector at the 4th SF of past frame */ + Word16 lsf_new[], /* i : LSF vector at the 4th SF of present frame */ + Word16 i_subfr, /* i : Pointer to current sf (equal to 0,40,80 or 120) */ + Word16 lsf_out[] /* o : interpolated LSF parameters for current sf */ +); + +#endif