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annotate dev/pack_gsmfr_rtp.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +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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11
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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 }