FreeCalypso > hg > gsm-codec-lib
annotate libgsmfrp/good_frame.c @ 181:3a0ee08a3b9d
doc/EFR-rationale: typo fix
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 02 Jan 2023 20:09:07 +0000 |
parents | 4812e00bc100 |
children | f081a6850fb5 |
rev | line source |
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libgsmfrp: implement handling of good frames
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1 /* |
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2 * In this module we implement preprocessing of received good frames. |
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3 */ |
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4 |
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5 #include <stdint.h> |
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6 #include <string.h> |
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7 #include "gsm_fr_preproc.h" |
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8 #include "internal.h" |
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9 |
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10 void gsmfr_preproc_good_frame(struct gsmfr_preproc_state *st, gsm_byte *frame) |
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11 { |
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12 int sid; |
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13 |
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14 /* always set correct magic */ |
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15 frame[0] = 0xD0 | frame[0] & 0x0F; |
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16 /* now classify by SID */ |
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17 sid = gsmfr_preproc_sid_classify(frame); |
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18 switch (sid) { |
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19 case 0: /* good speech frame */ |
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20 memcpy(&st->speech_frame, frame, sizeof(gsm_frame)); |
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21 st->rx_state = SPEECH; |
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22 return; |
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23 case 1: /* invalid SID frame */ |
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24 if (st->got_valid_sid) { |
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25 st->rx_state = COMFORT_NOISE; |
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26 gsmfr_preproc_gen_cn(st, frame); |
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27 } else { |
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28 st->rx_state = NO_DATA; |
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29 memcpy(frame, &gsmfr_preproc_silence_frame, |
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30 sizeof(gsm_frame)); |
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31 } |
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32 return; |
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33 case 2: /* valid SID frame */ |
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34 st->got_valid_sid = 1; |
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35 memcpy(st->sid_prefix, frame, 5); |
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36 st->sid_xmaxc[0] = ((frame[6] & 0x1F) << 1) | (frame[7] >> 7); |
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37 st->sid_xmaxc[1] = ((frame[13] & 0x1F) << 1) | (frame[14] >> 7); |
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38 st->sid_xmaxc[2] = ((frame[20] & 0x1F) << 1) | (frame[21] >> 7); |
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39 st->sid_xmaxc[3] = ((frame[27] & 0x1F) << 1) | (frame[28] >> 7); |
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40 st->rx_state = COMFORT_NOISE; |
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41 gsmfr_preproc_gen_cn(st, frame); |
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42 return; |
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43 } |
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44 } |