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annotate dev/pack_gsmfr_rtp.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 e4ca04586118
children
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1 /*
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2 * The function in this development-only module is a copy of
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3 * gsmfr_pack_from_array() from work-in-progress libgsmfr2, which in turn
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4 * was created to serve as a drop-in replacement for gsm_implode()
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5 * from classic libgsm. The function is copied here to avoid the
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6 * philosophical problem of libgsmfr2 being a dependency for developer aid
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7 * programs used in the development of that library.
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8 */
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10 #include <stdint.h>
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12 #define GSM_FR_MAGIC 0xD
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13
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14 void gsmfr_pack_to_rtp(const int16_t *params, uint8_t *frame)
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15 {
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16 uint8_t *c = frame;
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17 unsigned sub;
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18
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19 *c++ = (GSM_FR_MAGIC << 4)
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20 | ((params[0] >> 2) & 0xF);
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21 *c++ = ((params[0] & 0x3) << 6)
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22 | (params[1] & 0x3F);
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23 *c++ = ((params[2] & 0x1F) << 3)
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24 | ((params[3] >> 2) & 0x7);
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25 *c++ = ((params[3] & 0x3) << 6)
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26 | ((params[4] & 0xF) << 2)
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27 | ((params[5] >> 2) & 0x3);
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28 *c++ = ((params[5] & 0x3) << 6)
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29 | ((params[6] & 0x7) << 3)
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30 | (params[7] & 0x7);
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31 params += 8;
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32 for (sub = 0; sub < 4; sub++) {
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33 *c++ = ((params[0] & 0x7F) << 1)
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34 | ((params[1] >> 1) & 0x1);
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35 *c++ = ((params[1] & 0x1) << 7)
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36 | ((params[2] & 0x3) << 5)
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37 | ((params[3] >> 1) & 0x1F);
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38 *c++ = ((params[3] & 0x1) << 7)
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39 | ((params[4] & 0x7) << 4)
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40 | ((params[5] & 0x7) << 1)
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41 | ((params[6] >> 2) & 0x1);
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42 *c++ = ((params[6] & 0x3) << 6)
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43 | ((params[7] & 0x7) << 3)
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44 | (params[8] & 0x7);
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45 *c++ = ((params[9] & 0x7) << 5)
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46 | ((params[10] & 0x7) << 2)
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47 | ((params[11] >> 1) & 0x3);
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48 *c++ = ((params[11] & 0x1) << 7)
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49 | ((params[12] & 0x7) << 4)
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50 | ((params[13] & 0x7) << 1)
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51 | ((params[14] >> 2) & 0x1);
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52 *c++ = ((params[14] & 0x3) << 6)
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53 | ((params[15] & 0x7) << 3)
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54 | (params[16] & 0x7);
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55 params += 17;
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56 }
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57 }