FreeCalypso > hg > gsm-codec-lib

annotate libgsmfr2/pp_good.c @ 556:18aca50d68df default tip

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doc/Calypso-TCH-downlink: update for FR1 BFI-with-data
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 11 Oct 2024 01:54:00 +0000
parents 96c4ed5529bf
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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5 #include <stdint.h>
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6 #include <string.h>
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a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
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7 #include "tw_gsmfr.h"
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573afa985df6 libgsmfr2: split pp_state.h from pp_internal.h
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8 #include "pp_state.h"
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9 #include "pp_internal.h"
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11 void gsmfr_preproc_good_frame(struct gsmfr_preproc_state *st, uint8_t *frame)
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12 {
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13 int sid;
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14
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15 /* always set correct magic */
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16 frame[0] = 0xD0 | frame[0] & 0x0F;
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17 /* now classify by SID */
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18 sid = gsmfr_preproc_sid_classify(frame);
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19 switch (sid) {
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20 case 0: /* good speech frame */
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21 st->rx_state = SPEECH;
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22 st->dtxd_sid_flag = 0;
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23 memcpy(&st->speech_frame, frame, GSMFR_RTP_FRAME_LEN);
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24 return;
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25 case 1: /* invalid SID frame */
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26 /* state-dependent handling, similar to BFI */
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27 gsmfr_preproc_invalid_sid(st, frame);
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28 return;
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29 case 2: /* valid SID frame */
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30 st->rx_state = COMFORT_NOISE;
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31 st->dtxd_sid_flag = 1;
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32 gsmfr_preproc_sid2cn(st, frame);
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33 return;
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34 }
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35 }