FreeCalypso > hg > gsm-codec-lib
annotate amrconv/if1_unpack.c @ 449:2af2b5c12268
Library-versions: libtwamr is officially version 1.0.0
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 01:43:05 +0000 |
parents | 934cf92a1c45 |
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rev | line source |
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amrconv: new program amr-ietf-parse
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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 "amr_defs.h" |
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8 |
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9 extern const uint8_t amr_475_bit_order[95]; |
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10 extern const uint8_t amr_515_bit_order[103]; |
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11 extern const uint8_t amr_59_bit_order[118]; |
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12 extern const uint8_t amr_67_bit_order[134]; |
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13 extern const uint8_t amr_74_bit_order[148]; |
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14 extern const uint8_t amr_795_bit_order[159]; |
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15 extern const uint8_t amr_102_bit_order[204]; |
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16 extern const uint8_t amr_122_bit_order[244]; |
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17 |
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18 static void |
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19 unpack_bits(if1_bytes, codec_bits, nbits, table) |
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20 uint8_t *if1_bytes, *codec_bits; |
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21 unsigned nbits; |
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22 const uint8_t *table; |
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23 { |
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24 unsigned 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 amr_if1_unpack(if1_bytes, codec_bits, mode) |
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36 uint8_t *if1_bytes, *codec_bits; |
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37 unsigned mode; |
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38 { |
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39 switch (mode) { |
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40 case MR475: |
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41 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_475, |
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42 amr_475_bit_order); |
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43 return(0); |
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44 case MR515: |
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45 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_515, |
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46 amr_515_bit_order); |
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47 return(0); |
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48 case MR59: |
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49 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_59, |
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50 amr_59_bit_order); |
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51 return(0); |
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52 case MR67: |
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53 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_67, |
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54 amr_67_bit_order); |
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55 return(0); |
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56 case MR74: |
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57 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_74, |
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58 amr_74_bit_order); |
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59 return(0); |
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60 case MR795: |
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61 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_795, |
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62 amr_795_bit_order); |
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63 return(0); |
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64 case MR102: |
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65 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_102, |
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66 amr_102_bit_order); |
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67 return(0); |
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68 case MR122: |
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69 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_122, |
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70 amr_122_bit_order); |
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71 return(0); |
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72 case MRDTX: |
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73 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_SID, |
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74 (const uint8_t *) 0); |
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75 return(0); |
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76 default: |
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77 return(-1); |
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78 } |
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79 } |