FreeCalypso > hg > gsm-codec-lib

annotate libgsmfr2/tfo_main.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 c7b1e796e91b
children
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f681fb758041 libgsmfr2: add gsmfr_fulldec_rtp_in()
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1 /*
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2 * This module implements a wrapper around the main processing functions
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3 * of our Rx DTX or TFO preprocessor, handling RTP input per TW-TS-001.
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4 */
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5
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6 #include <stdint.h>
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7 #include <string.h>
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8 #include "tw_gsmfr.h"
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9
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10 int gsmfr_tfo_xfrm_main(struct gsmfr_preproc_state *st, const uint8_t *rtp_pl,
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11 unsigned rtp_pl_len, uint8_t *out)
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12 {
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13 switch (rtp_pl_len) {
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14 case 0:
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15 /* BFI-no-data, but not an invalid RTP input per se */
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16 gsmfr_preproc_bfi(st, 0, out);
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17 return 0;
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18 case 1:
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19 if ((rtp_pl[0] & 0xF6) != 0xE6)
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20 goto bad_rtp_input;
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21 /* TW-TS-001 No_Data frame */
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22 gsmfr_preproc_bfi(st, rtp_pl[0] & 1, out);
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23 return 0;
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24 case GSMFR_RTP_FRAME_LEN:
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25 if ((rtp_pl[0] & 0xF0) != 0xD0)
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26 goto bad_rtp_input;
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27 /* basic RTP format */
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28 memcpy(out, rtp_pl, GSMFR_RTP_FRAME_LEN);
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29 gsmfr_preproc_good_frame_hm(st, out);
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30 return 0;
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31 case GSMFR_RTP_FRAME_LEN+1:
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32 if ((rtp_pl[0] & 0xF4) != 0xE0)
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33 goto bad_rtp_input;
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34 if ((rtp_pl[1] & 0xF0) != 0xD0)
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35 goto bad_rtp_input;
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36 /* extended RTP format (TW-TS-001) */
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37 if (rtp_pl[0] & 0x02)
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38 gsmfr_preproc_bfi_bits(st, rtp_pl + 1, rtp_pl[0] & 1,
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39 out);
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40 else {
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41 memcpy(out, rtp_pl + 1, GSMFR_RTP_FRAME_LEN);
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42 gsmfr_preproc_good_frame_hm(st, out);
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43 }
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44 return 0;
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45 default:
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46 bad_rtp_input:
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47 /*
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48 * Treat it like BFI-no-data, and tell the caller
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49 * that we received an invalid RTP payload.
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50 */
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51 gsmfr_preproc_bfi(st, 0, out);
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52 return -1;
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53 }
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54 }