FreeCalypso > hg > gsm-codec-lib
annotate libgsmfr2/dec_main.c @ 269:bd2271cb95d4
libgsmfr2: integrate preprocess.c from libgsm
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 14 Apr 2024 01:58:35 +0000 |
parents | 8821ffaa93a5 |
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rev | line source |
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libgsmfr2: integrate decoder main function from libgsm
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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 } |