FreeCalypso > hg > gsm-codec-lib

annotate libgsmfr2/unpack_frame.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents f0220c141d2c
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_unpack_frame() function: unpacking a single
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3 * GSM-FR frame from libgsm/RTP format into a broken-down struct of params.
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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 void gsmfr_unpack_frame(const uint8_t *frame, struct gsmfr_param_frame *param)
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10 {
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11 const uint8_t *c = frame;
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12 unsigned sub;
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13
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14 param->LARc[0] = (*c++ & 0xF) << 2;
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15 param->LARc[0] |= (*c >> 6) & 0x3;
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16 param->LARc[1] = *c++ & 0x3F;
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17 param->LARc[2] = (*c >> 3) & 0x1F;
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18 param->LARc[3] = (*c++ & 0x7) << 2;
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19 param->LARc[3] |= (*c >> 6) & 0x3;
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20 param->LARc[4] = (*c >> 2) & 0xF;
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21 param->LARc[5] = (*c++ & 0x3) << 2;
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22 param->LARc[5] |= (*c >> 6) & 0x3;
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23 param->LARc[6] = (*c >> 3) & 0x7;
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24 param->LARc[7] = *c++ & 0x7;
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25 for (sub = 0; sub < 4; sub++) {
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26 param->Nc[sub] = (*c >> 1) & 0x7F;
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27 param->bc[sub] = (*c++ & 0x1) << 1;
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28 param->bc[sub] |= (*c >> 7) & 0x1;
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29 param->Mc[sub] = (*c >> 5) & 0x3;
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30 param->xmaxc[sub] = (*c++ & 0x1F) << 1;
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31 param->xmaxc[sub] |= (*c >> 7) & 0x1;
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32 param->xMc[sub][0] = (*c >> 4) & 0x7;
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33 param->xMc[sub][1] = (*c >> 1) & 0x7;
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34 param->xMc[sub][2] = (*c++ & 0x1) << 2;
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35 param->xMc[sub][2] |= (*c >> 6) & 0x3;
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36 param->xMc[sub][3] = (*c >> 3) & 0x7;
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37 param->xMc[sub][4] = *c++ & 0x7;
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38 param->xMc[sub][5] = (*c >> 5) & 0x7;
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39 param->xMc[sub][6] = (*c >> 2) & 0x7;
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40 param->xMc[sub][7] = (*c++ & 0x3) << 1;
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41 param->xMc[sub][7] |= (*c >> 7) & 0x1;
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42 param->xMc[sub][8] = (*c >> 4) & 0x7;
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43 param->xMc[sub][9] = (*c >> 1) & 0x7;
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44 param->xMc[sub][10] = (*c++ & 0x1) << 2;
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45 param->xMc[sub][10] |= (*c >> 6) & 0x3;
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46 param->xMc[sub][11] = (*c >> 3) & 0x7;
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47 param->xMc[sub][12] = *c++ & 0x7;
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48 }
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49 }