FreeCalypso > hg > gsm-codec-lib

annotate libgsmfr2/full_dec.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents 4db5fc10fd1a
children f3246d109e2d
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4db5fc10fd1a libgsmfr2: implement full decoder
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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
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22 struct gsmfr_fulldec_state *gsmfr_fulldec_create(void)
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23 {
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24 struct gsmfr_fulldec_state *st;
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25
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26 st = malloc(sizeof(struct gsmfr_fulldec_state));
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27 if (st)
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28 gsmfr_fulldec_reset(st);
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29 return st;
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30 }
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31
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32 void gsmfr_fulldec_reset(struct gsmfr_fulldec_state *st)
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33 {
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34 gsmfr_0610_reset(&st->dec_0610);
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35 gsmfr_preproc_reset(&st->rx_dtx);
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36 st->is_homed = 1;
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37 }
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38
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39 static void emit_ehf_output(int16_t *pcm_out)
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40 {
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41 unsigned n;
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42
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43 for (n = 0; n < 160; n++)
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44 pcm_out[n] = 0x0008;
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45 }
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46
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47 void gsmfr_fulldec_good_frame(struct gsmfr_fulldec_state *st,
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48 const uint8_t *frame_in, int16_t *pcm_out)
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49 {
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50 uint8_t frame_mod[GSMFR_RTP_FRAME_LEN];
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51
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52 if (st->is_homed && !memcmp(frame_in, gsmfr_decoder_homing_frame, 12)) {
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53 emit_ehf_output(pcm_out);
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54 return;
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55 }
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56 memcpy(frame_mod, frame_in, GSMFR_RTP_FRAME_LEN);
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57 gsmfr_preproc_good_frame(&st->rx_dtx, frame_mod);
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58 gsmfr_0610_decode_frame(&st->dec_0610, frame_mod, pcm_out);
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59 if (!memcmp(frame_in, gsmfr_decoder_homing_frame, GSMFR_RTP_FRAME_LEN))
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60 gsmfr_fulldec_reset(st);
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61 else
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62 st->is_homed = 0;
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63 }
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64
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65 void gsmfr_fulldec_bfi(struct gsmfr_fulldec_state *st, int taf,
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66 int16_t *pcm_out)
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67 {
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68 uint8_t frame_mod[GSMFR_RTP_FRAME_LEN];
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69
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70 if (st->is_homed) {
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71 memset(pcm_out, 0, sizeof(int16_t) * 160);
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72 return;
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73 }
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74 gsmfr_preproc_bfi(&st->rx_dtx, taf, frame_mod);
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75 gsmfr_0610_decode_frame(&st->dec_0610, frame_mod, pcm_out);
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76 }