FreeCalypso > hg > gsm-codec-lib
view libtwamr/lflg_upd.c @ 440:bc736a8654af
.hgignore: add amrefr-decode-r
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 09 May 2024 00:13:05 +0000 |
parents | bd5614fc780a |
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 : lflg_upd.c * Purpose : LTP_flag update for AMR VAD option 2 * ***************************************************************************** */ #include "tw_amr.h" #include "namespace.h" #include "typedef.h" #include "cnst.h" #include "basic_op.h" #include "oper_32b.h" #include "no_count.h" #include "vad2.h" /*************************************************************************** * * FUNCTION NAME: LTP_flag_update * * PURPOSE: * Set LTP_flag if the LTP gain > LTP_THRESHOLD, where the value of * LTP_THRESHOLD depends on the LTP analysis window length. * * INPUTS: * * mode * AMR mode * vadState->L_R0 * LTP energy * vadState->L_Rmax * LTP maximum autocorrelation * OUTPUTS: * * vadState->LTP_flag * Set if LTP gain > LTP_THRESHOLD * * RETURN VALUE: * * none * *************************************************************************/ void LTP_flag_update (vadState2 * st, Word16 mode) { Word16 thresh; Word16 hi1; Word16 lo1; Word32 Ltmp; test(); test(); if ((sub(mode, MR475) == 0) || (sub(mode, MR515) == 0)) { thresh = (Word16)(32768.0*0.55); move16(); } else if (sub(mode, MR102) == 0) { thresh = (Word16)(32768.0*0.60); move16(); } else { thresh = (Word16)(32768.0*0.65); move16(); } L_Extract (st->L_R0, &hi1, &lo1); Ltmp = Mpy_32_16(hi1, lo1, thresh); test(); if (L_sub(st->L_Rmax, Ltmp) > 0) { st->LTP_flag = TRUE; move16(); } else { st->LTP_flag = FALSE; move16(); } return; }