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annotate amrconv/if1_unpack.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 934cf92a1c45
children
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934cf92a1c45 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 }