FreeCalypso > hg > gsm-codec-lib

annotate libgsmfrp/good_frame.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 f081a6850fb5
children
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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 st->rx_state = SPEECH;
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21 memcpy(&st->speech_frame, frame, sizeof(gsm_frame));
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22 return;
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23 case 1: /* invalid SID frame */
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24 /* state-dependent handling, similar to BFI */
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25 gsmfr_preproc_invalid_sid(st, frame);
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26 return;
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27 case 2: /* valid SID frame */
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28 st->rx_state = COMFORT_NOISE;
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29 gsmfr_preproc_sid2cn(st, frame);
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30 return;
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31 }
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32 }