FreeCalypso > hg > gsm-codec-lib
annotate amrconv/if1_pack.c @ 480:332397bc80aa
doc/AMR-library-API: document public const data items
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 19 May 2024 23:18:17 +0000 |
parents | 4c4649a5fec3 |
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rev | line source |
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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 } |