FreeCalypso > hg > gsm-codec-lib
view libtwamr/lsp_avg.c @ 480:332397bc80aa
doc/AMR-library-API: document public const data items
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 19 May 2024 23:18:17 +0000 |
parents | 9cd332a94c97 |
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 : lsp_avg.c * Purpose: : LSP averaging and history * ***************************************************************************** */ /* ***************************************************************************** * MODULE INCLUDE FILE AND VERSION ID ***************************************************************************** */ #include "namespace.h" #include "lsp_avg.h" /* ***************************************************************************** * INCLUDE FILES ***************************************************************************** */ #include "basic_op.h" #include "oper_32b.h" #include "no_count.h" #include "q_plsf5_tab.h" #include "memops.h" /* ***************************************************************************** * LOCAL VARIABLES AND TABLES ***************************************************************************** */ /* ***************************************************************************** * PUBLIC PROGRAM CODE ***************************************************************************** */ /* ************************************************************************** * * Function : lsp_avg_reset * Purpose : Resets state memory * ************************************************************************** */ void lsp_avg_reset (lsp_avgState *st) { Copy(mean_lsf, &st->lsp_meanSave[0], M); } /* ************************************************************************** * * Function : lsp_avg * Purpose : Calculate the LSP averages * ************************************************************************** */ void lsp_avg ( lsp_avgState *st, /* i/o : State struct Q15 */ Word16 *lsp /* i : state of the state machine Q15 */ ) { Word16 i; Word32 L_tmp; /* Q31 */ for (i = 0; i < M; i++) { /* mean = 0.84*mean */ L_tmp = L_deposit_h(st->lsp_meanSave[i]); L_tmp = L_msu(L_tmp, EXPCONST, st->lsp_meanSave[i]); /* Add 0.16 of newest LSPs to mean */ L_tmp = L_mac(L_tmp, EXPCONST, lsp[i]); /* Save means */ st->lsp_meanSave[i] = round(L_tmp); move16(); /* Q15 */ } return; }