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annotate libgsmefr/dec_main.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 18866c0354ef
children
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1 /*
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2 * This module contains our GSM EFR decoder main function, EFR_decode_params(),
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3 * that stands at the boundary between our public interface and the guts of
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4 * ETSI-based codec.
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5 */
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6
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7 #include "gsm_efr.h"
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8 #include "typedef.h"
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9 #include "namespace.h"
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10 #include "basic_op.h"
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11 #include "cnst.h"
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12 #include "codec.h"
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13 #include "sig_proc.h"
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14 #include "memops.h"
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15 #include "dec_state.h"
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16 #include "d_homing.h"
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17
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18 /* These constants define the number of consecutive parameters
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19 that function decoder_homing_frame_test() checks */
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20
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21 #define WHOLE_FRAME 57
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22 #define TO_FIRST_SUBFRAME 18
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23
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24 void EFR_decode_params(struct EFR_decoder_state *st, const int16_t *params,
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25 int bfi, int SID_flag, int TAF, int16_t *pcm_out)
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26 {
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27 Word16 *synth = st->synth_buf + M;
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28 Word16 Az_dec[AZ_SIZE];
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29 Word16 i, temp;
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30 Word16 reset_flag;
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31
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32 if (!bfi) /* BFI == 0, perform DHF check */
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33 {
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34 if (st->reset_flag_old) /* Check for second and further
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35 successive DHF (to first subfr.) */
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36 {
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37 reset_flag = decoder_homing_frame_test (params,
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38 TO_FIRST_SUBFRAME);
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39 }
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40 else
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41 {
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42 reset_flag = 0;
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43 }
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44 }
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45 else /* BFI==1, bypass DHF check (frame
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46 is taken as not being a DHF) */
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47 {
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48 reset_flag = 0;
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49 }
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50
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51 if (reset_flag && st->reset_flag_old)
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52 {
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53 /* Force the output to be the encoder homing frame pattern */
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54
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55 for (i = 0; i < L_FRAME; i++)
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56 {
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57 synth[i] = EHF_MASK;
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58 }
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59 }
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60 else
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61 {
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62 /* Synthesis */
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63 Decoder_12k2 (st, bfi, params, synth, Az_dec, TAF, SID_flag);
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64
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65 Post_Filter (st, synth, Az_dec); /* Post-filter */
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66
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67 for (i = 0; i < L_FRAME; i++)
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68 /* Upscale the 15 bit linear PCM to 16 bits,
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69 then truncate to 13 bits */
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70 {
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71 temp = shl (synth[i], 1);
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72 synth[i] = temp & 0xfff8;
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73 }
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74 } /* else */
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75
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76 Copy (synth, pcm_out, L_FRAME);
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77
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78 /* BFI == 0, perform check for first DHF (whole frame) */
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79 if (!bfi && !st->reset_flag_old)
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80 {
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81 reset_flag = decoder_homing_frame_test (params, WHOLE_FRAME);
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82 }
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83
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84 if (reset_flag)
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85 {
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86 /* Bring the decoder and receive DTX to the home state */
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87 EFR_decoder_reset(st);
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88 } else {
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89 st->reset_flag_old = 0;
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90 }
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91 }