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annotate libgsmhr1/unpack_frame.c @ 508:c275e57132f8

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libgsmhr1/{pack,unpack}_frame.c: comment fix there is only one unvoiced mode, hence it should be singular
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 17 Aug 2024 21:45:34 +0000
parents 4d80730683d4
children
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4d80730683d4 libgsmhr1: implement TS 101 318 packing and unpacking
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1 /*
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2 * This module holds our gsmhr_unpack_ts101318() function: unpacking a single
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3 * GSM-HR codec frame from TS 101 318 packed format into the codec's native
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4 * array of parameters.
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5 */
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6
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7 #include <stdint.h>
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8 #include "tw_gsmhr.h"
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9
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10 void gsmhr_unpack_ts101318(const uint8_t *payload, int16_t *params)
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11 {
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12 const uint8_t *c = payload;
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13
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14 params[0] = (*c >> 3) & 0x1F;
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15 params[1] = (*c++ & 0x7) << 8;
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16 params[1] |= *c++;
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17 params[2] = (*c++ & 0xFF) << 1;
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18 params[2] |= (*c >> 7) & 0x1;
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19 params[3] = (*c++ & 0x7F) << 1;
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20 params[3] |= (*c >> 7) & 0x1;
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21 params[4] = (*c >> 6) & 0x1;
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22 params[5] = (*c >> 4) & 0x3;
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23 if (params[5]) {
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24 /* voiced modes */
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25 params[6] = (*c++ & 0xF) << 4;
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26 params[6] |= (*c >> 4) & 0xF;
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27 params[7] = (*c++ & 0xF) << 5;
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28 params[7] |= (*c >> 3) & 0x1F;
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29 params[8] = (*c++ & 0x7) << 2;
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30 params[8] |= (*c >> 6) & 0x3;
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31 params[9] = (*c >> 2) & 0xF;
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32 params[10] = (*c++ & 0x3) << 7;
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33 params[10] |= (*c >> 1) & 0x7F;
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34 params[11] = (*c++ & 0x1) << 4;
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35 params[11] |= (*c >> 4) & 0xF;
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36 params[12] = *c++ & 0xF;
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37 params[13] = (*c++ & 0xFF) << 1;
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38 params[13] |= (*c >> 7) & 0x1;
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39 params[14] = (*c >> 2) & 0x1F;
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40 params[15] = (*c++ & 0x3) << 2;
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41 params[15] |= (*c >> 6) & 0x3;
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42 params[16] = (*c++ & 0x3F) << 3;
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43 params[16] |= (*c >> 5) & 0x7;
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44 params[17] = *c++ & 0x1F;
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45 } else {
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46 /* unvoiced mode */
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47 params[6] = (*c++ & 0xF) << 3;
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48 params[6] |= (*c >> 5) & 0x7;
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49 params[7] = (*c++ & 0x1F) << 2;
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50 params[7] |= (*c >> 6) & 0x3;
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51 params[8] = (*c >> 1) & 0x1F;
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52 params[9] = (*c++ & 0x1) << 6;
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53 params[9] |= (*c >> 2) & 0x3F;
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54 params[10] = (*c++ & 0x3) << 5;
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55 params[10] |= (*c >> 3) & 0x1F;
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56 params[11] = (*c++ & 0x7) << 2;
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57 params[11] |= (*c >> 6) & 0x3;
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58 params[12] = (*c++ & 0x3F) << 1;
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59 params[12] |= (*c >> 7) & 0x1;
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60 params[13] = *c++ & 0x7F;
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61 params[14] = (*c >> 3) & 0x1F;
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62 params[15] = (*c++ & 0x7) << 4;
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63 params[15] |= (*c >> 4) & 0xF;
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64 params[16] = (*c++ & 0xF) << 3;
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65 params[16] |= (*c >> 5) & 0x7;
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66 params[17] = *c++ & 0x1F;
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67 }
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68 }