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annotate dev/efr-bit-packing.c @ 605:63f774192906

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gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents 9639a44ae2e7
children
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1 /*
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2 * We would like to generate our EFR RTP frame packing and unpacking code
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3 * using bitter and sweet utilities from libgsm, so we'll end up packing
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4 * and unpacking EFR just like good old FR. However, because of our
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5 * slightly different approach, entering the spec file for bitter and sweet
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6 * manually would be tedious and error-prone, hence we are going to
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7 * generate it with this program.
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8 */
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12
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13 #define PRM_NO 57
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15 /* table from ETSI EFR code */
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16 static const unsigned bitno[PRM_NO] =
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17 {
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18 7, 8, 9, 8, 6, /* LSP VQ */
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19 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* first subframe */
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20 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* second subframe */
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21 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* third subframe */
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22 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5 /* fourth subframe */
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23 };
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25 main(argc, argv)
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26 char **argv;
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27 {
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28 unsigned n;
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30 printf("EFR_MAGIC\t4\n");
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31 for (n = 0; n < PRM_NO; n++)
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32 printf("params[%u]\t%u\n", n, bitno[n]);
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33 exit(0);
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34 }