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annotate libtwamr/if1_pack.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents ebe499058c63
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 "tw_amr.h"
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9 #include "typedef.h"
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10 #include "namespace.h"
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11 #include "int_defs.h"
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12 #include "if1_func.h"
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14 static inline void msb_set_bit(uint8_t *buf, Word16 bn, Word16 bit)
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15 {
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16 Word16 pos_byte = bn >> 3;
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17 Word16 pos_bit = 7 - (bn & 7);
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18
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19 if (bit)
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20 buf[pos_byte] |= (1 << pos_bit);
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21 else
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22 buf[pos_byte] &= ~(1 << pos_bit);
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23 }
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24
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25 static void pack_bits(uint8_t *if1_bytes, const Word16 *src_bits, Word16 nbits,
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26 const uint8_t *table)
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27 {
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28 Word16 n, nb;
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29
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30 for (n = 0; n < nbits; n++) {
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31 if (table)
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32 nb = table[n];
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33 else
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34 nb = n;
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35 msb_set_bit(if1_bytes, n, src_bits[nb]);
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36 }
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37 }
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38
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39 void if1_pack_bytes(enum Mode mode, const Word16 *serial_bits,
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40 uint8_t *if1_bytes)
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41 {
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42 switch (mode) {
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43 case MR475:
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44 pack_bits(if1_bytes, serial_bits, AMR_NBITS_475, sort_475);
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45 if1_bytes[11] &= 0xFE;
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46 return;
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47 case MR515:
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48 pack_bits(if1_bytes, serial_bits, AMR_NBITS_515, sort_515);
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49 if1_bytes[12] &= 0xFE;
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50 return;
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51 case MR59:
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52 pack_bits(if1_bytes, serial_bits, AMR_NBITS_59, sort_59);
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53 if1_bytes[14] &= 0xFC;
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54 return;
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55 case MR67:
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56 pack_bits(if1_bytes, serial_bits, AMR_NBITS_67, sort_67);
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57 if1_bytes[16] &= 0xFC;
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58 return;
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59 case MR74:
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60 pack_bits(if1_bytes, serial_bits, AMR_NBITS_74, sort_74);
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61 if1_bytes[18] &= 0xF0;
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62 return;
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63 case MR795:
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64 pack_bits(if1_bytes, serial_bits, AMR_NBITS_795, sort_795);
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65 if1_bytes[19] &= 0xFE;
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66 return;
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67 case MR102:
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68 pack_bits(if1_bytes, serial_bits, AMR_NBITS_102, sort_102);
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69 if1_bytes[25] &= 0xF0;
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70 return;
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71 case MR122:
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72 pack_bits(if1_bytes, serial_bits, AMR_NBITS_122, sort_122);
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73 if1_bytes[30] &= 0xF0;
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74 return;
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75 case MRDTX:
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76 pack_bits(if1_bytes, serial_bits, AMR_NBITS_SID,
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77 (const uint8_t *) 0);
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78 if1_bytes[4] &= 0xE0;
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79 return;
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80 }
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81 }