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annotate libgsmefr/d1035pf.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 6ad363f7ea30
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: dec_10i40_35bits()
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4 *
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5 * PURPOSE: Builds the innovative codevector from the received
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6 * index of algebraic codebook.
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7 *
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8 * See c1035pf.c for more details about the algebraic codebook structure.
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9 *
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10 *************************************************************************/
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11
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12 #include "gsm_efr.h"
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13 #include "typedef.h"
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14 #include "namespace.h"
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15 #include "basic_op.h"
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16 #include "memops.h"
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17 #include "no_count.h"
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18 #include "codec.h"
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20 #define L_CODE 40 /* codevector length */
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21 #define NB_PULSE 10 /* number of pulses */
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22 #define NB_TRACK 5 /* number of track */
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24 void dec_10i40_35bits (
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25 const Word16 index[], /* (i) : index of 10 pulses (sign+position) */
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26 Word16 cod[] /* (o) : algebraic (fixed) codebook excitation */
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27 )
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28 {
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29 static const Word16 dgray[8] = {0, 1, 3, 2, 5, 6, 4, 7};
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30 Word16 i, j, pos1, pos2, sign, tmp;
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32 Set_zero (cod, L_CODE);
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34 /* decode the positions and signs of pulses and build the codeword */
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36 for (j = 0; j < NB_TRACK; j++)
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37 {
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38 /* compute index i */
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40 tmp = index[j]; move16 ();
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41 i = tmp & 7; logic16 ();
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42 i = dgray[i]; move16 ();
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43
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44 i *= 5;
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45 pos1 = i + j; /* position of pulse "j" */
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47 i = shr (tmp, 3) & 1; logic16 ();
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48 if (i == 0)
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49 {
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50 sign = 4096; move16 (); /* +1.0 */
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51 }
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52 else
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53 {
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54 sign = -4096; move16 (); /* -1.0 */
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55 }
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57 cod[pos1] = sign; move16 ();
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59 /* compute index i */
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61 i = index[add (j, 5)] & 7; logic16 ();
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62 i = dgray[i]; move16 ();
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63 i *= 5;
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65 pos2 = i + j; /* position of pulse "j+5" */
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67 if (pos2 < pos1)
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68 {
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69 sign = negate (sign);
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70 }
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71 cod[pos2] = add (cod[pos2], sign); move16 ();
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72 }
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74 return;
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75 }