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annotate libtwamr/if1_unpack.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 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 "tw_amr.h"
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8 #include "typedef.h"
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9 #include "namespace.h"
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10 #include "int_defs.h"
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11 #include "if1_func.h"
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12
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13 static inline Word16 msb_get_bit(const uint8_t *buf, Word16 bn)
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14 {
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15 Word16 pos_byte = bn >> 3;
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16 Word16 pos_bit = 7 - (bn & 7);
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17
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18 return (buf[pos_byte] >> pos_bit) & 1;
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19 }
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20
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21 static void unpack_bits(const uint8_t *if1_bytes, Word16 *codec_bits,
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22 Word16 nbits, const uint8_t *table)
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23 {
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24 Word16 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 void if1_unpack_bytes(enum Mode mode, const uint8_t *if1_bytes,
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36 Word16 *serial_bits)
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37 {
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38 switch (mode) {
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39 case MR475:
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40 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_475, sort_475);
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41 return;
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42 case MR515:
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43 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_515, sort_515);
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44 return;
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45 case MR59:
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46 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_59, sort_59);
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47 return;
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48 case MR67:
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49 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_67, sort_67);
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50 return;
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51 case MR74:
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52 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_74, sort_74);
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53 return;
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54 case MR795:
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55 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_795, sort_795);
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56 return;
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57 case MR102:
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58 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_102, sort_102);
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59 return;
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60 case MR122:
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61 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_122, sort_122);
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62 return;
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63 case MRDTX:
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64 unpack_bits(if1_bytes, serial_bits, AMR_NBITS_SID,
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65 (const uint8_t *) 0);
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66 return;
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67 }
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68 }