FreeCalypso > hg > gsm-codec-lib

annotate amrconv/if1_unpack.c @ 500:66fb1fd032e6

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libgsmhr1/mathhalf.[ch]: import original
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 19 Jun 2024 00:51:26 +0000
parents 934cf92a1c45
children
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934cf92a1c45 amrconv: new program amr-ietf-parse
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1 /*
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2 * In this module we implement our function for unpacking bits from AMR IF1
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3 * and reshuffling them into the codec's natural bit order.
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4 */
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5
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6 #include <stdint.h>
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7 #include "amr_defs.h"
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8
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9 extern const uint8_t amr_475_bit_order[95];
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10 extern const uint8_t amr_515_bit_order[103];
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11 extern const uint8_t amr_59_bit_order[118];
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12 extern const uint8_t amr_67_bit_order[134];
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13 extern const uint8_t amr_74_bit_order[148];
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14 extern const uint8_t amr_795_bit_order[159];
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15 extern const uint8_t amr_102_bit_order[204];
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16 extern const uint8_t amr_122_bit_order[244];
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17
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18 static void
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19 unpack_bits(if1_bytes, codec_bits, nbits, table)
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20 uint8_t *if1_bytes, *codec_bits;
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21 unsigned nbits;
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22 const uint8_t *table;
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23 {
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24 unsigned n, nb;
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25
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26 for (n = 0; n < nbits; n++) {
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27 if (table)
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28 nb = table[n];
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29 else
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30 nb = n;
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31 codec_bits[nb] = msb_get_bit(if1_bytes, n);
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32 }
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33 }
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34
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35 amr_if1_unpack(if1_bytes, codec_bits, mode)
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36 uint8_t *if1_bytes, *codec_bits;
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37 unsigned mode;
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38 {
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39 switch (mode) {
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40 case MR475:
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41 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_475,
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42 amr_475_bit_order);
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43 return(0);
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44 case MR515:
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45 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_515,
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46 amr_515_bit_order);
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47 return(0);
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48 case MR59:
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49 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_59,
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50 amr_59_bit_order);
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51 return(0);
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52 case MR67:
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53 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_67,
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54 amr_67_bit_order);
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55 return(0);
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56 case MR74:
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57 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_74,
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58 amr_74_bit_order);
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59 return(0);
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60 case MR795:
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61 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_795,
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62 amr_795_bit_order);
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63 return(0);
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64 case MR102:
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65 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_102,
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66 amr_102_bit_order);
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67 return(0);
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68 case MR122:
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69 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_122,
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70 amr_122_bit_order);
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71 return(0);
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72 case MRDTX:
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73 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_SID,
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74 (const uint8_t *) 0);
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75 return(0);
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76 default:
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77 return(-1);
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78 }
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79 }