FreeCalypso > hg > gsm-codec-lib

annotate libgsmfrp/good_frame.c @ 251:946849291027

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CHANGES: document changes since gsm-codec-lib-r1
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 May 2023 06:13:56 +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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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 }