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annotate libgsmefr/dec_rtp_in.c @ 549:d9f6b3125259

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document TW-TS-005 utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 00:58:01 +0000
parents f2d0f2f15d5f
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 full decoder, 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 "gsm_efr.h"
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8
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9 int EFR_decode_rtp(struct EFR_decoder_state *st, const uint8_t *rtp_pl,
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10 unsigned rtp_pl_len, int16_t *pcm)
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11 {
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12 switch (rtp_pl_len) {
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13 case 0:
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14 /* BFI-no-data, but not an invalid RTP input per se */
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15 EFR_decode_bfi_nodata(st, 0, pcm);
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16 return 0;
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17 case 1:
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18 if ((rtp_pl[0] & 0xF6) != 0xE6)
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19 goto bad_rtp_input;
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20 /* TW-TS-001 No_Data frame */
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21 EFR_decode_bfi_nodata(st, rtp_pl[0] & 1, pcm);
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22 return 0;
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23 case EFR_RTP_FRAME_LEN:
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24 if ((rtp_pl[0] & 0xF0) != 0xC0)
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25 goto bad_rtp_input;
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26 /* basic RTP format */
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27 EFR_decode_frame(st, rtp_pl, 0, 0, pcm);
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28 return 0;
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29 case EFR_RTP_FRAME_LEN+1:
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30 if ((rtp_pl[0] & 0xF4) != 0xE0)
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31 goto bad_rtp_input;
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32 if ((rtp_pl[1] & 0xF0) != 0xC0)
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33 goto bad_rtp_input;
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34 /* extended RTP format (TW-TS-001) */
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35 EFR_decode_frame(st, rtp_pl + 1, (rtp_pl[0] & 2) >> 1,
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36 rtp_pl[0] & 1, pcm);
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37 return 0;
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38 default:
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39 bad_rtp_input:
f681fb758041 libgsmfr2: add gsmfr_fulldec_rtp_in()
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40 /*
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41 * Treat it like BFI-no-data, and tell the caller
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42 * that we received an invalid RTP payload.
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43 */
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44 EFR_decode_bfi_nodata(st, 0, pcm);
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45 return -1;
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46 }
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47 }