FreeCalypso > hg > gsm-codec-lib
diff libtwamr/preemph.h @ 399:3618b5cf25a6
libtwamr: integrate preemph.c
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Mon, 06 May 2024 19:19:27 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtwamr/preemph.h Mon May 06 19:19:27 2024 +0000 @@ -0,0 +1,53 @@ +/* +******************************************************************************** +* +* 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 : preemph.h +* Purpose : Preemphasis filtering +* Description : Filtering through 1 - g z^-1 +* +******************************************************************************** +*/ +#ifndef preemph_h +#define preemph_h "$Id $" + +/* +******************************************************************************** +* INCLUDE FILES +******************************************************************************** +*/ +#include "typedef.h" + +/* +******************************************************************************** +* DEFINITION OF DATA TYPES +******************************************************************************** +*/ +typedef struct { + Word16 mem_pre; /* filter state */ +} preemphasisState; + +/* +******************************************************************************** +* DECLARATION OF PROTOTYPES +******************************************************************************** +*/ + +void preemphasis_reset (preemphasisState *st); +/* reset of preemphasis filter (i.e. set state memory to zero) + returns 0 on success + */ + +int preemphasis ( + preemphasisState *st, /* (i/o): preemphasis filter state */ + Word16 *signal, /* (i/o): input signal overwritten by the output */ + Word16 g, /* (i) : preemphasis coefficient */ + Word16 L /* (i) : size of filtering */ +); + +#endif