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annotate libgsmefr/lsp_lsf.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 bcd337afa0f1
children
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1 /*************************************************************************
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2 *
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3 * FUNCTIONS: Lsp_lsf and Lsf_lsp
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4 *
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5 * PURPOSE:
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6 * Lsp_lsf: Transformation lsp to lsf
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7 * Lsf_lsp: Transformation lsf to lsp
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8 *
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9 * DESCRIPTION:
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10 * lsp[i] = cos(2*pi*lsf[i]) and lsf[i] = arccos(lsp[i])/(2*pi)
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11 *
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12 * The transformation from lsp[i] to lsf[i] and lsf[i] to lsp[i] are
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13 * approximated by a look-up table and interpolation.
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14 *
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15 *************************************************************************/
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16
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17 #include "gsm_efr.h"
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18 #include "typedef.h"
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19 #include "namespace.h"
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20 #include "basic_op.h"
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21 #include "no_count.h"
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22 #include "sig_proc.h"
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24 #include "lsp_lsf.tab" /* Look-up table for transformations */
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26 void Lsf_lsp (
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27 Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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28 Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */
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29 Word16 m /* (i) : LPC order */
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30 )
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31 {
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32 Word16 i, ind, offset;
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33 Word32 L_tmp;
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34
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35 for (i = 0; i < m; i++)
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36 {
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37 ind = shr (lsf[i], 8); /* ind = b8-b15 of lsf[i] */
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38 offset = lsf[i] & 0x00ff; logic16 (); /* offset = b0-b7 of lsf[i] */
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40 /* lsp[i] = table[ind]+ ((table[ind+1]-table[ind])*offset) / 256 */
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42 L_tmp = L_mult (sub (table[ind + 1], table[ind]), offset);
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43 lsp[i] = add (table[ind], extract_l (L_shr (L_tmp, 9)));
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44 move16 ();
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45 }
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46 return;
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47 }
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49 void Lsp_lsf (
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50 Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */
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51 Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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52 Word16 m /* (i) : LPC order */
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53 )
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54 {
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55 Word16 i, ind;
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56 Word32 L_tmp;
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58 ind = 63; /* begin at end of table -1 */
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60 for (i = m - 1; i >= 0; i--)
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61 {
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62 /* find value in table that is just greater than lsp[i] */
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63 test ();
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64 while (table[ind] < lsp[i])
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65 {
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66 ind--;
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67 test ();
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68 }
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70 /* acos(lsp[i])= ind*256 + ( ( lsp[i]-table[ind] ) *
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71 slope[ind] )/4096 */
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73 L_tmp = L_mult (sub (lsp[i], table[ind]), slope[ind]);
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74 /*(lsp[i]-table[ind])*slope[ind])>>12*/
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75 lsf[i] = round (L_shl (L_tmp, 3)); move16 ();
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76 lsf[i] = add (lsf[i], shl (ind, 8)); move16 ();
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77 }
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78 return;
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79 }