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annotate libgsmfr2/dec_main.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 8821ffaa93a5
children
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1 /*
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2 * This C source file has been adapted from TU-Berlin libgsm source
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3 * (src/decode.c), original notice follows:
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4 *
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5 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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6 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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7 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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8 */
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9
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10 #include <stdint.h>
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11 #include "tw_gsmfr.h"
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12 #include "typedef.h"
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13 #include "ed_state.h"
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14 #include "ed_internal.h"
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15
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16 /*
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17 * 4.3 FIXED POINT IMPLEMENTATION OF THE RPE-LTP DECODER
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18 */
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19
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20 static void Postprocessing (
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21 struct gsmfr_0610_state * S,
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22 register word * s)
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23 {
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24 register int k;
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25 register word msr = S->msr;
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26 register longword ltmp; /* for GSM_ADD */
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27 register word tmp;
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28
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29 for (k = 160; k--; s++) {
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30 tmp = GSM_MULT_R( msr, 28180 );
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31 msr = GSM_ADD(*s, tmp); /* Deemphasis */
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32 *s = GSM_ADD(msr, msr) & 0xFFF8; /* Truncation & Upscaling */
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33 }
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34 S->msr = msr;
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35 }
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36
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37 void gsmfr_0610_decode_params(struct gsmfr_0610_state *S,
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38 const struct gsmfr_param_frame *inp, int16_t *s)
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39 {
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40 int j, k;
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41 word erp[40], wt[160];
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42 word * drp = S->dp0 + 120;
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43
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44 for (j=0; j <= 3; j++) {
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45 Gsm_RPE_Decoding(S, inp->xmaxc[j], inp->Mc[j], inp->xMc[j],
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46 erp);
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47 Gsm_Long_Term_Synthesis_Filtering(S, inp->Nc[j], inp->bc[j],
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48 erp, drp);
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49
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50 for (k = 0; k <= 39; k++) wt[ j * 40 + k ] = drp[ k ];
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51 }
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52
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53 Gsm_Short_Term_Synthesis_Filter(S, inp->LARc, wt, s);
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54 Postprocessing(S, s);
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55 }