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annotate libgsmfr2/full_dec.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 3a617e4e9b27
children
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1 /*
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2 * This module implements the "full decoder" functionality of libgsmfr2:
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3 * first the Rx DTX handler, then the regular GSM 06.10 decoder. This full
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4 * decoder also implements the optional homing feature, resetting both
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5 * components upon receiving DHF.
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6 */
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7
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include "tw_gsmfr.h"
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12 #include "typedef.h"
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13 #include "ed_state.h"
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14 #include "pp_state.h"
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15
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16 struct gsmfr_fulldec_state {
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17 struct gsmfr_0610_state dec_0610;
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18 struct gsmfr_preproc_state rx_dtx;
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19 int is_homed;
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20 };
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21
533
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22 const unsigned gsmfr_fulldec_state_size = sizeof(struct gsmfr_fulldec_state);
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23
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24 struct gsmfr_fulldec_state *gsmfr_fulldec_create(void)
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25 {
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26 struct gsmfr_fulldec_state *st;
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27
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28 st = malloc(sizeof(struct gsmfr_fulldec_state));
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29 if (st)
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30 gsmfr_fulldec_reset(st);
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31 return st;
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32 }
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33
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34 void gsmfr_fulldec_reset(struct gsmfr_fulldec_state *st)
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35 {
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36 gsmfr_0610_reset(&st->dec_0610);
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37 gsmfr_preproc_reset(&st->rx_dtx);
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38 st->is_homed = 1;
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39 }
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40
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41 static void emit_ehf_output(int16_t *pcm_out)
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42 {
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43 unsigned n;
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44
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45 for (n = 0; n < 160; n++)
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46 pcm_out[n] = 0x0008;
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47 }
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48
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49 void gsmfr_fulldec_good_frame(struct gsmfr_fulldec_state *st,
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50 const uint8_t *frame_in, int16_t *pcm_out)
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51 {
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52 uint8_t frame_mod[GSMFR_RTP_FRAME_LEN];
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53
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54 if (st->is_homed && !memcmp(frame_in, gsmfr_decoder_homing_frame, 12)) {
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55 emit_ehf_output(pcm_out);
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56 return;
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57 }
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58 memcpy(frame_mod, frame_in, GSMFR_RTP_FRAME_LEN);
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59 gsmfr_preproc_good_frame(&st->rx_dtx, frame_mod);
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60 gsmfr_0610_decode_frame(&st->dec_0610, frame_mod, pcm_out);
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61 if (!memcmp(frame_in, gsmfr_decoder_homing_frame, GSMFR_RTP_FRAME_LEN))
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62 gsmfr_fulldec_reset(st);
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63 else
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64 st->is_homed = 0;
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65 }
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66
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67 void gsmfr_fulldec_bfi(struct gsmfr_fulldec_state *st, int taf,
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68 int16_t *pcm_out)
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69 {
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70 uint8_t frame_mod[GSMFR_RTP_FRAME_LEN];
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71
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72 if (st->is_homed) {
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73 memset(pcm_out, 0, sizeof(int16_t) * 160);
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74 return;
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75 }
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76 gsmfr_preproc_bfi(&st->rx_dtx, taf, frame_mod);
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77 gsmfr_0610_decode_frame(&st->dec_0610, frame_mod, pcm_out);
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78 }
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79
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80 void gsmfr_fulldec_bfi_bits(struct gsmfr_fulldec_state *st,
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81 const uint8_t *bad_frame, int taf, int16_t *pcm_out)
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82 {
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83 uint8_t frame_mod[GSMFR_RTP_FRAME_LEN];
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84
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85 if (st->is_homed) {
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86 memset(pcm_out, 0, sizeof(int16_t) * 160);
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87 return;
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88 }
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89 gsmfr_preproc_bfi_bits(&st->rx_dtx, bad_frame, taf, frame_mod);
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90 gsmfr_0610_decode_frame(&st->dec_0610, frame_mod, pcm_out);
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91 }