FreeCalypso > hg > gsm-codec-lib
view libtwamr/preemph.h @ 602:72cdae602d6e
libgsmhr1/dec_func.c: rm unused static functions
In the original code, sp_dec.c held two kinds of functions: those
needed only as part of the decoder, and those used by both decoder
and encoder engines. In this library, we have moved the latter
class of functions to dec_func.c module. Almost all static functions
from the original sp_dec.c, with the exception of aToRc(), are
needed only on sp_dec.c side of the new divide - remove them from
dec_func.c, where they became dead code.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 04 Dec 2025 18:58:22 +0000 |
| parents | 3618b5cf25a6 |
| 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 : 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