FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/dec_main.c @ 390:bde9f5804670
libtwamr: integrate ph_disp.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 06 May 2024 18:20:22 +0000 |
parents | 18866c0354ef |
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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 } |