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annotate amrconv/if1_pack.c @ 481:cc0c244bd233

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doc/AMR-library-tests: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:02:37 +0000
parents 4c4649a5fec3
children
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1 /*
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2 * In this module we implement our function for packing AMR codec bits
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3 * from an array containing them in the codec's natural bit order
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4 * into the octet form of AMR IF1 and RFC 4867.
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5 */
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6
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7 #include <stdint.h>
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8 #include "amr_defs.h"
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9
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10 extern const uint8_t amr_475_bit_order[95];
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11 extern const uint8_t amr_515_bit_order[103];
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12 extern const uint8_t amr_59_bit_order[118];
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13 extern const uint8_t amr_67_bit_order[134];
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14 extern const uint8_t amr_74_bit_order[148];
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15 extern const uint8_t amr_795_bit_order[159];
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16 extern const uint8_t amr_102_bit_order[204];
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17 extern const uint8_t amr_122_bit_order[244];
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18
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19 static void
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20 pack_bits(if1_bytes, codec_bits, nbits, table)
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21 uint8_t *if1_bytes, *codec_bits;
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22 unsigned nbits;
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23 const uint8_t *table;
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24 {
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25 unsigned n, nb;
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26
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27 for (n = 0; n < nbits; n++) {
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28 if (table)
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29 nb = table[n];
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30 else
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31 nb = n;
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32 msb_set_bit(if1_bytes, n, codec_bits[nb]);
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33 }
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34 }
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35
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36 amr_if1_pack(if1_bytes, codec_bits, mode)
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37 uint8_t *if1_bytes, *codec_bits;
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38 unsigned mode;
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39 {
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40 switch (mode) {
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41 case MR475:
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42 pack_bits(if1_bytes, codec_bits, AMR_NBITS_475,
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43 amr_475_bit_order);
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44 if1_bytes[11] &= 0xFE;
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45 return(0);
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46 case MR515:
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47 pack_bits(if1_bytes, codec_bits, AMR_NBITS_515,
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48 amr_515_bit_order);
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49 if1_bytes[12] &= 0xFE;
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50 return(0);
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51 case MR59:
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52 pack_bits(if1_bytes, codec_bits, AMR_NBITS_59,
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53 amr_59_bit_order);
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54 if1_bytes[14] &= 0xFC;
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55 return(0);
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56 case MR67:
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57 pack_bits(if1_bytes, codec_bits, AMR_NBITS_67,
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58 amr_67_bit_order);
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59 if1_bytes[16] &= 0xFC;
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60 return(0);
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61 case MR74:
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62 pack_bits(if1_bytes, codec_bits, AMR_NBITS_74,
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63 amr_74_bit_order);
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64 if1_bytes[18] &= 0xF0;
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65 return(0);
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66 case MR795:
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67 pack_bits(if1_bytes, codec_bits, AMR_NBITS_795,
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68 amr_795_bit_order);
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69 if1_bytes[19] &= 0xFE;
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70 return(0);
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71 case MR102:
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72 pack_bits(if1_bytes, codec_bits, AMR_NBITS_102,
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73 amr_102_bit_order);
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74 if1_bytes[25] &= 0xF0;
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75 return(0);
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76 case MR122:
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77 pack_bits(if1_bytes, codec_bits, AMR_NBITS_122,
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78 amr_122_bit_order);
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79 if1_bytes[30] &= 0xF0;
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80 return(0);
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81 case MRDTX:
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82 pack_bits(if1_bytes, codec_bits, AMR_NBITS_SID,
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83 (const uint8_t *) 0);
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84 if1_bytes[4] &= 0xE0;
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85 return(0);
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86 default:
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87 return(-1);
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88 }
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89 }