FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/if1_unpack.c @ 504:024615de06fe
libgsmhr1: compile mathdp31.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 19 Jun 2024 01:19:41 +0000 |
parents | ebe499058c63 |
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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 } |