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annotate libgsmfr2/pack_frame.c @ 481:cc0c244bd233

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doc/AMR-library-tests: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:02:37 +0000
parents c344b4f35eb7
children
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c344b4f35eb7 libgsmfr2: implement gsmfr_pack_frame()
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1 /*
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2 * This module holds our gsmfr_pack_frame() function: packing a single GSM-FR
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3 * frame from a struct of broken-down parameters into libgsm/RTP format.
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4 */
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5
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6 #include <stdint.h>
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7 #include "tw_gsmfr.h"
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8
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9 #define GSM_FR_MAGIC 0xD
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10
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11 void gsmfr_pack_frame(const struct gsmfr_param_frame *param, uint8_t *frame)
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12 {
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13 uint8_t *c = frame;
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14 unsigned sub;
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15
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16 *c++ = (GSM_FR_MAGIC << 4)
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17 | ((param->LARc[0] >> 2) & 0xF);
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18 *c++ = ((param->LARc[0] & 0x3) << 6)
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19 | (param->LARc[1] & 0x3F);
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20 *c++ = ((param->LARc[2] & 0x1F) << 3)
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21 | ((param->LARc[3] >> 2) & 0x7);
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22 *c++ = ((param->LARc[3] & 0x3) << 6)
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23 | ((param->LARc[4] & 0xF) << 2)
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24 | ((param->LARc[5] >> 2) & 0x3);
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25 *c++ = ((param->LARc[5] & 0x3) << 6)
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26 | ((param->LARc[6] & 0x7) << 3)
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27 | (param->LARc[7] & 0x7);
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28 for (sub = 0; sub < 4; sub++) {
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29 *c++ = ((param->Nc[sub] & 0x7F) << 1)
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30 | ((param->bc[sub] >> 1) & 0x1);
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31 *c++ = ((param->bc[sub] & 0x1) << 7)
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32 | ((param->Mc[sub] & 0x3) << 5)
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33 | ((param->xmaxc[sub] >> 1) & 0x1F);
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34 *c++ = ((param->xmaxc[sub] & 0x1) << 7)
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35 | ((param->xMc[sub][0] & 0x7) << 4)
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36 | ((param->xMc[sub][1] & 0x7) << 1)
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37 | ((param->xMc[sub][2] >> 2) & 0x1);
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38 *c++ = ((param->xMc[sub][2] & 0x3) << 6)
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39 | ((param->xMc[sub][3] & 0x7) << 3)
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40 | (param->xMc[sub][4] & 0x7);
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41 *c++ = ((param->xMc[sub][5] & 0x7) << 5)
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42 | ((param->xMc[sub][6] & 0x7) << 2)
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43 | ((param->xMc[sub][7] >> 1) & 0x3);
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44 *c++ = ((param->xMc[sub][7] & 0x1) << 7)
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45 | ((param->xMc[sub][8] & 0x7) << 4)
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46 | ((param->xMc[sub][9] & 0x7) << 1)
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47 | ((param->xMc[sub][10] >> 2) & 0x1);
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48 *c++ = ((param->xMc[sub][10] & 0x3) << 6)
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49 | ((param->xMc[sub][11] & 0x7) << 3)
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50 | (param->xMc[sub][12] & 0x7);
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51 }
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52 }