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annotate dev/gsm0611-silence-fr.c @ 152:a217a6eacbad

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doc/PCM-file-formats: establish "robe" format
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 14 Dec 2022 22:40:31 +0000
parents 61cb83bd11ec
children e4ca04586118
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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
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include <gsm.h>
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13
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14 static const gsm_signal lar_params[8] = {42, 39, 21, 10, 9, 4, 3, 2};
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15 static const gsm_signal 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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16 {40, 0, 1, 0, 3, 4, 3, 4, 4, 3, 3, 3, 3, 4, 4, 3, 3};
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17
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18 main(argc, argv)
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19 char **argv;
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20 {
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21 gsm state;
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22 gsm_signal params[76];
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23 gsm_byte frame[33];
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24 unsigned n;
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25
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26 /* gsm_implode() requires dummy state */
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27 state = gsm_create();
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28 if (!state) {
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29 fprintf(stderr, "gsm_create() failed!\n");
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30 exit(1);
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31 }
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32 /* gather params */
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33 bcopy(lar_params, params, sizeof(gsm_signal) * 8);
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34 bcopy(subframe_params, params + 8, sizeof(gsm_signal) * 17);
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35 bcopy(subframe_params, params + 25, sizeof(gsm_signal) * 17);
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36 bcopy(subframe_params, params + 42, sizeof(gsm_signal) * 17);
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37 bcopy(subframe_params, params + 59, sizeof(gsm_signal) * 17);
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38 /* generate frame */
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39 gsm_implode(state, params, frame);
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40 /* print the frame */
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41 for (n = 0; n < 33; n++) {
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42 printf("0x%02X,", frame[n]);
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43 if (n == 4 || n == 11 || n == 18 || n == 25 || n == 32)
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44 putchar('\n');
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45 else
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46 putchar(' ');
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47 }
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48 exit(0);
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49 }