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annotate libgsmhr1/rtp_in_direct.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 5bf71b091323
children
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510
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1 /*
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2 * The function implemented in this module takes whatever HRv1 payload format
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3 * came in from RTP (can be RFC 5993 with or without TW-TS-002 extensions,
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4 * can be bare TS 101 318, can be zero-length or missing payload) and turns it
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5 * into the internal input form for the HRv1 decoder. It is logically
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6 * equivalent to calling gsmhr_rtp_in_preen() followed by
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7 * gsmhr_decoder_twts002_in(), but is more efficient by avoiding the extra
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8 * intermediate buffer and copying.
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9 */
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10
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11 #include <stdint.h>
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12 #include <string.h>
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13 #include "tw_gsmhr.h"
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14
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15 static void emit_bfi_nodata(int16_t *params)
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16 {
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17 memset(params, 0, sizeof(int16_t) * GSMHR_NUM_PARAMS);
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18 params[18] = 2; /* BFI with no data */
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19 params[19] = 0; /* UFI */
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20 params[20] = 0; /* SID */
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21 params[21] = 0; /* TAF */
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22 }
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23
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24 int gsmhr_rtp_in_direct(const uint8_t *rtp_in, unsigned rtp_in_len,
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25 int16_t *params)
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26 {
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27 int ft;
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28
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29 switch (rtp_in_len) {
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30 case 0:
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31 /* BFI-no-data, but not an invalid RTP input per se */
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32 emit_bfi_nodata(params);
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33 return 0;
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34 case 1:
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35 /*
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36 * This length is valid only if the payload is in
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37 * RFC 5993 or TW-TS-002 format with FT=1 or FT=7.
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38 */
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39 if (rtp_in[0] & 0x80)
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40 goto bad_rtp_input;
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41 ft = rtp_in[0] >> 4;
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42 if (ft == 1 || ft == 7) {
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43 gsmhr_decoder_twts002_in(rtp_in, params);
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44 return 0;
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45 } else
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46 goto bad_rtp_input;
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47 case GSMHR_FRAME_LEN_RPF:
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48 /*
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49 * The length is that of a TS 101 318 payload.
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50 * No further checks can be done: every possible
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51 * bit pattern is a valid payload in this format.
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52 * But we do need to check for a perfect SID
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53 * (the only kind of SID this format allows)
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54 * and mark it accordingly in the output.
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55 */
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56 gsmhr_unpack_ts101318(rtp_in, params);
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57 params[18] = 0; /* BFI */
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58 params[19] = 0; /* UFI */
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59 params[20] = gsmhr_ts101318_is_perfect_sid(rtp_in);
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60 params[21] = 0; /* TAF */
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61 return 0;
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62 case GSMHR_FRAME_LEN_5993:
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63 /*
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64 * This length is valid only if the payload is in
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65 * RFC 5993 or TW-TS-002 format with FT=0, FT=2 or FT=6.
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66 */
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67 if (rtp_in[0] & 0x80)
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68 goto bad_rtp_input;
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69 ft = rtp_in[0] >> 4;
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70 if (ft == 0 || ft == 2 || ft == 6) {
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71 gsmhr_decoder_twts002_in(rtp_in, params);
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72 return 0;
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73 } else
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74 goto bad_rtp_input;
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75 default:
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76 bad_rtp_input:
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77 /*
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78 * Treat it like BFI-no-data, and tell the caller
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79 * that we received an invalid RTP payload.
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80 */
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81 emit_bfi_nodata(params);
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82 return -1;
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83 }
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84 }