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annotate libgsmfr2/unpack_frame.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +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 }