FreeCalypso > hg > gsm-codec-lib

annotate libgsmfr2/unpack_frame2.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents cfcb3ce9c778
children
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1 /*
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2 * This module holds our gsmfr_unpack_to_array() function: a drop-in
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3 * replacement for gsm_explode() from classic libgsm.
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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_to_array(const uint8_t *frame, int16_t *params)
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10 {
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f0220c141d2c libgsmfr2: implement gsmfr_unpack_frame()
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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 params[0] = (*c++ & 0xF) << 2;
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15 params[0] |= (*c >> 6) & 0x3;
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16 params[1] = *c++ & 0x3F;
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17 params[2] = (*c >> 3) & 0x1F;
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18 params[3] = (*c++ & 0x7) << 2;
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19 params[3] |= (*c >> 6) & 0x3;
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20 params[4] = (*c >> 2) & 0xF;
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21 params[5] = (*c++ & 0x3) << 2;
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22 params[5] |= (*c >> 6) & 0x3;
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23 params[6] = (*c >> 3) & 0x7;
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24 params[7] = *c++ & 0x7;
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25 params += 8;
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26 for (sub = 0; sub < 4; sub++) {
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27 params[0] = (*c >> 1) & 0x7F;
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28 params[1] = (*c++ & 0x1) << 1;
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29 params[1] |= (*c >> 7) & 0x1;
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30 params[2] = (*c >> 5) & 0x3;
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31 params[3] = (*c++ & 0x1F) << 1;
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32 params[3] |= (*c >> 7) & 0x1;
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33 params[4] = (*c >> 4) & 0x7;
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34 params[5] = (*c >> 1) & 0x7;
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35 params[6] = (*c++ & 0x1) << 2;
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36 params[6] |= (*c >> 6) & 0x3;
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37 params[7] = (*c >> 3) & 0x7;
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38 params[8] = *c++ & 0x7;
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39 params[9] = (*c >> 5) & 0x7;
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40 params[10] = (*c >> 2) & 0x7;
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41 params[11] = (*c++ & 0x3) << 1;
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42 params[11] |= (*c >> 7) & 0x1;
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43 params[12] = (*c >> 4) & 0x7;
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44 params[13] = (*c >> 1) & 0x7;
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45 params[14] = (*c++ & 0x1) << 2;
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46 params[14] |= (*c >> 6) & 0x3;
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47 params[15] = (*c >> 3) & 0x7;
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48 params[16] = *c++ & 0x7;
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49 params += 17;
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50 }
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51 }