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annotate libgsmefr/g_code.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 9dac98926a2d
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: G_code
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4 *
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5 * PURPOSE: Compute the innovative codebook gain.
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6 *
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7 * DESCRIPTION:
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8 * The innovative codebook gain is given by
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9 *
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10 * g = <x[], y[]> / <y[], y[]>
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11 *
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12 * where x[] is the target vector, y[] is the filtered innovative
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13 * codevector, and <> denotes dot product.
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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 "cnst.h"
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23 #include "codec.h"
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25 Word16 G_code ( /* out : Gain of innovation code */
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26 Word16 xn2[], /* in : target vector */
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27 Word16 y2[] /* in : filtered innovation vector */
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28 )
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29 {
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30 Word16 i;
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31 Word16 xy, yy, exp_xy, exp_yy, gain;
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32 Word16 scal_y2[L_SUBFR];
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33 Word32 s;
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34
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35 /* Scale down Y[] by 2 to avoid overflow */
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37 for (i = 0; i < L_SUBFR; i++)
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38 {
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39 scal_y2[i] = shr (y2[i], 1); move16 ();
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40 }
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42 /* Compute scalar product <X[],Y[]> */
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44 s = 1L; move32 (); /* Avoid case of all zeros */
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45 for (i = 0; i < L_SUBFR; i++)
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46 {
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47 s = L_mac (s, xn2[i], scal_y2[i]);
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48 }
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49 exp_xy = norm_l (s);
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50 xy = extract_h (L_shl (s, exp_xy));
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52 /* If (xy < 0) gain = 0 */
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54 test ();
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55 if (xy <= 0)
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56 return ((Word16) 0);
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58 /* Compute scalar product <Y[],Y[]> */
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59
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60 s = 0L; move32 ();
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61 for (i = 0; i < L_SUBFR; i++)
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62 {
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63 s = L_mac (s, scal_y2[i], scal_y2[i]);
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64 }
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65 exp_yy = norm_l (s);
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66 yy = extract_h (L_shl (s, exp_yy));
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68 /* compute gain = xy/yy */
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70 xy = shr (xy, 1); /* Be sure xy < yy */
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71 gain = div_s (xy, yy);
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72
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73 /* Denormalization of division */
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74 i = add (exp_xy, 5); /* 15-1+9-18 = 5 */
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75 i = sub (i, exp_yy);
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77 gain = shr (gain, i);
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78
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79 return (gain);
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80 }