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doc/Calypso-TCH-downlink: update for FR1 BFI-with-data
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 11 Oct 2024 01:54:00 +0000
parents e4ca04586118
children
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6780b23654bd libgsmfrp: starting with the silence frame
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1 /*
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2 * This program is meant to be run only once by the developer - it uses
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3 * libgsm function gsm_implode() to transform the idle frame of GSM 06.11
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4 * (3GPP TS 46.011) from the table format given in the spec into
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5 * libgsm/RTP format.
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6 *
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7 * Later update: this program has been reworked to use the local function
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8 * in pack_gsmfr_rtp.c instead of gsm_implode(), in order to eliminate
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9 * all build dependencies on old libgsm.
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10 */
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12 #include <stdio.h>
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13 #include <stdint.h>
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14 #include <stdlib.h>
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15 #include <string.h>
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16 #include <strings.h>
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18 extern void gsmfr_pack_to_rtp(const int16_t *params, uint8_t *frame);
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19
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20 static const int16_t lar_params[8] = {42, 39, 21, 10, 9, 4, 3, 2};
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21 static const int16_t subframe_params[17] =
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61cb83bd11ec GSM 06.11 silence frame: it's Nc=40 first, then bc=0
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22 {40, 0, 1, 0, 3, 4, 3, 4, 4, 3, 3, 3, 3, 4, 4, 3, 3};
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24 main(argc, argv)
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25 char **argv;
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26 {
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27 int16_t params[76];
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28 uint8_t frame[33];
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29 unsigned n;
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30
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31 /* gather params */
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32 bcopy(lar_params, params, sizeof(int16_t) * 8);
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33 bcopy(subframe_params, params + 8, sizeof(int16_t) * 17);
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34 bcopy(subframe_params, params + 25, sizeof(int16_t) * 17);
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35 bcopy(subframe_params, params + 42, sizeof(int16_t) * 17);
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36 bcopy(subframe_params, params + 59, sizeof(int16_t) * 17);
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37 /* generate frame */
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38 gsmfr_pack_to_rtp(params, frame);
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39 /* print the frame */
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40 for (n = 0; n < 33; n++) {
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41 printf("0x%02X,", frame[n]);
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42 if (n == 4 || n == 11 || n == 18 || n == 25 || n == 32)
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43 putchar('\n');
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44 else
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45 putchar(' ');
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46 }
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47 exit(0);
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48 }