FreeCalypso > hg > gsm-codec-lib
view libgsmfr2/dec_main.c @ 378:ccba5812fa44
libtwamr: integrate gain_q.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 06 May 2024 04:38:55 +0000 |
parents | 8821ffaa93a5 |
children |
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/* * This C source file has been adapted from TU-Berlin libgsm source * (src/decode.c), original notice follows: * * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische * Universitaet Berlin. See the accompanying file "COPYRIGHT" for * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE. */ #include <stdint.h> #include "tw_gsmfr.h" #include "typedef.h" #include "ed_state.h" #include "ed_internal.h" /* * 4.3 FIXED POINT IMPLEMENTATION OF THE RPE-LTP DECODER */ static void Postprocessing ( struct gsmfr_0610_state * S, register word * s) { register int k; register word msr = S->msr; register longword ltmp; /* for GSM_ADD */ register word tmp; for (k = 160; k--; s++) { tmp = GSM_MULT_R( msr, 28180 ); msr = GSM_ADD(*s, tmp); /* Deemphasis */ *s = GSM_ADD(msr, msr) & 0xFFF8; /* Truncation & Upscaling */ } S->msr = msr; } void gsmfr_0610_decode_params(struct gsmfr_0610_state *S, const struct gsmfr_param_frame *inp, int16_t *s) { int j, k; word erp[40], wt[160]; word * drp = S->dp0 + 120; for (j=0; j <= 3; j++) { Gsm_RPE_Decoding(S, inp->xmaxc[j], inp->Mc[j], inp->xMc[j], erp); Gsm_Long_Term_Synthesis_Filtering(S, inp->Nc[j], inp->bc[j], erp, drp); for (k = 0; k <= 39; k++) wt[ j * 40 + k ] = drp[ k ]; } Gsm_Short_Term_Synthesis_Filter(S, inp->LARc, wt, s); Postprocessing(S, s); }