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annotate dev/pack_gsmfr_rtp.c @ 312:78739fda2856

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doc/AMR-EFR-conversion: update for current understanding
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 17 Apr 2024 22:08:49 +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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9
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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 }