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annotate libgsmfr2/enc_main.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +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 }