FreeCalypso > hg > gsm-codec-lib
diff libtwamr/lpc.h @ 386:9adfe3863a41
libtwamr: integrate lpc.c
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Mon, 06 May 2024 06:24:26 +0000 |
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| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtwamr/lpc.h Mon May 06 06:24:26 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 : lpc.h +* Purpose : 2 LP analyses centered at 2nd and 4th subframe +* for mode 12.2. For all other modes a +* LP analysis centered at 4th subframe is +* performed. +* +******************************************************************************** +*/ +#ifndef lpc_h +#define lpc_h "$Id $" + +/* +******************************************************************************** +* INCLUDE FILES +******************************************************************************** +*/ +#include "tw_amr.h" +#include "typedef.h" +#include "levinson.h" + +/* +******************************************************************************** +* LOCAL VARIABLES AND TABLES +******************************************************************************** +*/ +/* +******************************************************************************** +* DEFINITION OF DATA TYPES +******************************************************************************** +*/ +typedef struct { + LevinsonState levinsonSt; +} lpcState; + +/* +******************************************************************************** +* DECLARATION OF PROTOTYPES +******************************************************************************** +*/ + +void lpc_reset (lpcState *st); +/* reset of pre processing state (i.e. set state memory to zero) + returns 0 on success + */ + +int lpc( + lpcState *st, /* i/o: State struct */ + enum Mode mode, /* i : coder mode */ + Word16 x[], /* i : Input signal Q15 */ + Word16 x_12k2[], /* i : Input signal (EFR) Q15 */ + Word16 a[] /* o : predictor coefficients Q12 */ +); + +#endif