FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/d1035pf.c @ 85:db8e0b69a6bb
libgsmefr: pred_lt6.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 08:59:34 +0000 |
parents | d273a77d5523 |
children | d80e9f12a1d1 |
rev | line source |
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libgsmefr: import most *.c files from ETSI source
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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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19 |
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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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23 |
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24 void dec_10i40_35bits ( |
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25 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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31 |
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32 Set_zero (cod, L_CODE); |
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33 |
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34 /* decode the positions and signs of pulses and build the codeword */ |
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35 |
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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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39 |
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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 = extract_l (L_shr (L_mult (i, 5), 1)); |
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45 pos1 = add (i, j); /* position of pulse "j" */ |
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46 |
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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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56 |
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57 cod[pos1] = sign; move16 (); |
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58 |
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59 /* compute index i */ |
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60 |
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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 = extract_l (L_shr (L_mult (i, 5), 1)); |
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64 |
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65 pos2 = add (i, j); /* position of pulse "j+5" */ |
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66 |
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67 if (sub (pos2, pos1) < 0) |
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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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73 |
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74 return; |
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75 } |