FreeCalypso > hg > gsm-codec-lib
view libtwamr/lpc.h @ 434:ba5031723ab6
implement amrefr-tseq-enc test program
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 08 May 2024 02:17:08 +0000 |
parents | 9adfe3863a41 |
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 : 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