FreeCalypso > hg > gsm-codec-lib

annotate libgsmfrp/good_frame.c @ 237:e4a4bf11f37c

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doc/PCM8-conversions: document command line utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 08 May 2023 04:29:05 +0000
parents 4812e00bc100
children f081a6850fb5
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4812e00bc100 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 }