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annotate trau-decode/extr-efr.c @ 72:afebef67e8d4 default tip

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tmo/CSD-tests: document Experiment 7
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Nov 2024 02:53:59 +0000
parents 0565aaa84b17
children
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1 /*
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2 * This module implements the EFR decoding part of trau-extr.
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdint.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <gsm_efr.h>
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11 #include "osmo_bits.h"
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12
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13 static void
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14 dbits_to_frame(d_bits, frame)
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15 ubit_t *d_bits;
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16 uint8_t *frame;
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17 {
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18 ubit_t intermed[248], *ip;
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19 uint8_t *op, mask;
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20 unsigned nb;
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21
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22 intermed[0] = 1;
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23 intermed[1] = 1;
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24 intermed[2] = 0;
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25 intermed[3] = 0;
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26 bcopy(d_bits + 1, intermed + 4, 38);
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27 bcopy(d_bits + 42, intermed + 42, 53);
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28 bcopy(d_bits + 98, intermed + 95, 50);
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29 bcopy(d_bits + 151, intermed + 145, 53);
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30 bcopy(d_bits + 207, intermed + 198, 50);
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31 ip = intermed;
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32 op = frame;
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33 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
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34 *op = 0;
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35 for (mask = 0x80; mask; mask >>= 1) {
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36 if (*ip)
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37 *op |= mask;
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38 ip++;
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39 }
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40 op++;
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41 }
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42 }
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43
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44 void
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45 convert_efr_frame(d_bits, outf)
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46 ubit_t *d_bits;
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47 FILE *outf;
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48 {
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49 uint8_t frame[EFR_RTP_FRAME_LEN];
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50
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51 dbits_to_frame(d_bits, frame);
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52 fwrite(frame, 1, EFR_RTP_FRAME_LEN, outf);
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53 }