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annotate libgsmfr2/enc_main.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents a7b593e68ac3
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/code.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 <string.h>
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12 #include "tw_gsmfr.h"
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13 #include "typedef.h"
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14 #include "ed_state.h"
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15 #include "ed_internal.h"
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16
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17 /*
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18 * 4.2 FIXED POINT IMPLEMENTATION OF THE RPE-LTP CODER
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19 */
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20
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21 void gsmfr_0610_encode_params(struct gsmfr_0610_state *S, const int16_t *s,
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22 struct gsmfr_param_frame *outp)
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23 {
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24 int k;
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25 word * dp = S->dp0 + 120; /* [ -120...-1 ] */
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26 word * dpp = dp; /* [ 0...39 ] */
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27
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28 word so[160];
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29
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30 Gsm_Preprocess (S, s, so);
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31 Gsm_LPC_Analysis (S, so, outp->LARc);
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32 Gsm_Short_Term_Analysis_Filter (S, outp->LARc, so);
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33
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34 for (k = 0; k <= 3; k++) {
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35
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36 Gsm_Long_Term_Predictor ( S,
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37 so+k*40, /* d [0..39] IN */
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38 dp, /* dp [-120..-1] IN */
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39 S->e + 5, /* e [0..39] OUT */
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40 dpp, /* dpp [0..39] OUT */
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41 &outp->Nc[k],
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42 &outp->bc[k]);
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43
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44 Gsm_RPE_Encoding ( S,
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45 S->e + 5,/* e ][0..39][ IN/OUT */
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46 &outp->xmaxc[k], &outp->Mc[k],
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47 outp->xMc[k] );
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48 /*
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49 * Gsm_Update_of_reconstructed_short_time_residual_signal
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50 * ( dpp, S->e + 5, dp );
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51 */
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52
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53 { register int i;
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54 register longword ltmp;
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55 for (i = 0; i <= 39; i++)
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56 dp[ i ] = GSM_ADD( S->e[5 + i], dpp[i] );
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57 }
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58 dp += 40;
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59 dpp += 40;
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60
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61 }
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62 (void)memcpy( (char *)S->dp0, (char *)(S->dp0 + 160),
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63 120 * sizeof(*S->dp0) );
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64 }