FreeCalypso > hg > gsm-codec-lib
annotate libgsmfr2/full_dec.c @ 417:f17e42c63058
libtwamr: integrate ol_ltp.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 07 May 2024 03:21:14 +0000 |
parents | 4db5fc10fd1a |
children | f3246d109e2d |
rev | line source |
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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 } |