FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/dtx_dec.c @ 465:026bdc1f0dda
amrefr-tseq-enc: use the new DHF xform that matches T-Mobile
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 May 2024 21:43:35 +0000 |
parents | 17f690749099 |
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rev | line source |
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1 /* |
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2 * This file is a product of splitting ETSI EFR dtx.c into parts; |
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3 * the present module is the decoder-specific part. |
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4 */ |
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5 |
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6 #include "gsm_efr.h" |
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7 #include "typedef.h" |
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8 #include "namespace.h" |
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9 #include "basic_op.h" |
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10 #include "cnst.h" |
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11 #include "sig_proc.h" |
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12 #include "memops.h" |
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13 #include "no_count.h" |
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14 #include "dtx.h" |
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15 #include "dtx_defs.h" |
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16 #include "dec_state.h" |
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17 |
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18 /************************************************************************* |
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19 * |
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20 * FUNCTION NAME: reset_rx_dtx |
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21 * |
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22 * PURPOSE: Resets the static variables of the RX DTX handler to their |
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23 * initial values |
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24 * |
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25 *************************************************************************/ |
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26 |
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27 void reset_rx_dtx (struct EFR_decoder_state *st) |
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28 { |
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29 Word16 i; |
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30 |
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31 /* suppose infinitely long speech period before start */ |
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32 |
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33 st->rxdtx_aver_period = DTX_HANGOVER; |
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34 st->rxdtx_N_elapsed = 0x7fff; |
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35 st->rxdtx_ctrl = RX_SP_FLAG; |
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36 |
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37 for (i = 0; i < DTX_HANGOVER; i++) |
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38 { |
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39 st->lsf_old_rx[i][0] = 1384; |
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40 st->lsf_old_rx[i][1] = 2077; |
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41 st->lsf_old_rx[i][2] = 3420; |
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42 st->lsf_old_rx[i][3] = 5108; |
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43 st->lsf_old_rx[i][4] = 6742; |
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44 st->lsf_old_rx[i][5] = 8122; |
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45 st->lsf_old_rx[i][6] = 9863; |
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46 st->lsf_old_rx[i][7] = 11092; |
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47 st->lsf_old_rx[i][8] = 12714; |
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48 st->lsf_old_rx[i][9] = 13701; |
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49 } |
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50 |
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51 for (i = 0; i < 4 * DTX_HANGOVER; i++) |
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52 { |
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53 st->gain_code_old_rx[i] = 0; |
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54 } |
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55 |
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56 st->L_pn_seed_rx = PN_INITIAL_SEED; |
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57 st->rx_dtx_state = CN_INT_PERIOD - 1; |
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58 |
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59 st->prev_SID_frames_lost = 0; |
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60 st->buf_p_rx = 0; |
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61 |
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62 return; |
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63 } |
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64 |
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65 /************************************************************************* |
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66 * |
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67 * FUNCTION NAME: rx_dtx |
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68 * |
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69 * PURPOSE: DTX handler of the speech decoder. Determines when to update |
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70 * the reference comfort noise parameters (LSF and gain) at the |
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71 * end of the speech burst. Also classifies the incoming frames |
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72 * according to SID flag and BFI flag |
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73 * and determines when the transmission is active during comfort |
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74 * noise insertion. This function also initializes the pseudo |
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75 * noise generator shift register. |
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76 * |
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77 * Operation of the RX DTX handler is based on measuring the |
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78 * lengths of speech bursts and the lengths of the pauses between |
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79 * speech bursts to determine when there exists a hangover period |
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80 * at the end of a speech burst. The idea is to keep in sync with |
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81 * the TX DTX handler to be able to update the reference comfort |
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82 * noise parameters at the same time instances. |
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83 * |
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84 * INPUTS: *rxdtx_ctrl Old decoder DTX control word |
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85 * TAF Time alignment flag |
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86 * bfi Bad frame indicator flag |
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87 * SID_flag Silence descriptor flag |
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88 * |
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89 * OUTPUTS: *rxdtx_ctrl Updated decoder DTX control word |
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90 * rx_dtx_state Updated state of comfort noise interpolation |
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91 * period (global variable) |
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92 * L_pn_seed_rx Initialized pseudo noise generator shift |
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93 * register (global variable) |
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94 * |
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95 * RETURN VALUE: none |
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96 * |
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97 *************************************************************************/ |
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98 |
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99 void rx_dtx ( |
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100 struct EFR_decoder_state *st, |
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101 Word16 TAF, |
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102 Word16 bfi, |
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103 Word16 SID_flag |
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104 ) |
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105 { |
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106 Word16 frame_type; |
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107 |
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108 /* Frame classification according to bfi-flag and ternary-valued |
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109 SID flag. The frames between SID updates (not actually trans- |
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libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
110 mitted) are also classified here; they will be discarded later |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
111 and provided with "NO TRANSMISSION"-flag */ |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
112 |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
113 if ((SID_flag == 2) && (bfi == 0)) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
114 { |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
115 frame_type = VALID_SID_FRAME; move16 (); |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
116 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
117 else if ((SID_flag == 0) && (bfi == 0)) |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
118 { |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
119 frame_type = GOOD_SPEECH_FRAME; move16 (); |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
120 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
121 else if ((SID_flag == 0) && (bfi != 0)) |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
122 { |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
123 frame_type = UNUSABLE_FRAME; move16 (); |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
124 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
125 else |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
126 { |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
127 frame_type = INVALID_SID_FRAME; move16 (); |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
128 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
129 |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
130 /* Update of decoder state */ |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
131 /* Previous frame was classified as a speech frame */ |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
132 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
133 { |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
134 if (frame_type == VALID_SID_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
135 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
136 st->rxdtx_ctrl = RX_FIRST_SID_UPDATE; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
137 } |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
138 else if (frame_type == INVALID_SID_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
139 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
140 st->rxdtx_ctrl = RX_FIRST_SID_UPDATE |
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
141 | RX_INVALID_SID_FRAME; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
142 } |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
143 else if (frame_type == UNUSABLE_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
144 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
145 st->rxdtx_ctrl = RX_SP_FLAG; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
146 } |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
147 else if (frame_type == GOOD_SPEECH_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
148 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
149 st->rxdtx_ctrl = RX_SP_FLAG; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
150 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
151 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
152 else |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
153 { |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
154 if (frame_type == VALID_SID_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
155 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
156 st->rxdtx_ctrl = RX_CONT_SID_UPDATE; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
157 } |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
158 else if (frame_type == INVALID_SID_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
159 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
160 st->rxdtx_ctrl = RX_CONT_SID_UPDATE |
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
161 | RX_INVALID_SID_FRAME; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
162 } |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
163 else if (frame_type == UNUSABLE_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
164 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
165 st->rxdtx_ctrl = RX_CNI_BFI; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
166 } |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
167 else if (frame_type == GOOD_SPEECH_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
168 { |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
169 /* If the previous frame (during CNI period) was muted, |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
170 raise the RX_PREV_DTX_MUTING flag */ |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
171 if ((st->rxdtx_ctrl & RX_DTX_MUTING) != 0) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
172 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
173 st->rxdtx_ctrl = RX_SP_FLAG | RX_FIRST_SP_FLAG |
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
174 | RX_PREV_DTX_MUTING; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
175 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
176 else |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
177 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
178 st->rxdtx_ctrl = RX_SP_FLAG | RX_FIRST_SP_FLAG; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
179 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
180 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
181 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
182 |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
183 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
184 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
185 st->prev_SID_frames_lost = 0; |
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
186 st->rx_dtx_state = CN_INT_PERIOD - 1; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
187 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
188 else |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
189 { |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
190 /* First SID frame */ |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
191 if ((st->rxdtx_ctrl & RX_FIRST_SID_UPDATE) != 0) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
192 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
193 st->prev_SID_frames_lost = 0; |
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
194 st->rx_dtx_state = CN_INT_PERIOD - 1; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
195 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
196 |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
197 /* SID frame detected, but not the first SID */ |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
198 if ((st->rxdtx_ctrl & RX_CONT_SID_UPDATE) != 0) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
199 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
200 st->prev_SID_frames_lost = 0; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
201 |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
202 if (frame_type == VALID_SID_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
203 { |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
204 st->rx_dtx_state = 0; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
205 } |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
206 else if (frame_type == INVALID_SID_FRAME) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
207 { |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
208 if (st->rx_dtx_state < (CN_INT_PERIOD - 1)) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
209 { |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
210 st->rx_dtx_state++; |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
211 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
212 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
213 } |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
214 |
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
215 /* Bad frame received in CNI mode */ |
67
58b64224d4ac
libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
216 if ((st->rxdtx_ctrl & RX_CNI_BFI) != 0) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
217 { |
192
0303ba213e1c
libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents:
119
diff
changeset
|
218 if (st->rx_dtx_state < (CN_INT_PERIOD - 1)) |
66
824ff833bda9
libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
219 { |
192
0303ba213e1c
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220 st->rx_dtx_state++; |
66
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221 } |
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222 |
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223 /* If an unusable frame is received during CNI period |
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224 when TAF == 1, the frame is classified as a lost |
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225 SID frame */ |
205
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226 if (TAF) |
66
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227 { |
67
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228 st->rxdtx_ctrl = st->rxdtx_ctrl | RX_LOST_SID_FRAME; |
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229 st->prev_SID_frames_lost = add (st->prev_SID_frames_lost, 1); |
66
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230 } |
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231 else /* No transmission occurred */ |
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232 { |
67
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233 st->rxdtx_ctrl = st->rxdtx_ctrl | RX_NO_TRANSMISSION; |
66
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234 } |
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235 |
192
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236 if (st->prev_SID_frames_lost > 1) |
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237 { |
67
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238 st->rxdtx_ctrl = st->rxdtx_ctrl | RX_DTX_MUTING; |
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239 } |
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240 } |
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241 } |
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242 |
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243 /* N_elapsed (frames since last SID update) is incremented. If SID |
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244 is updated N_elapsed is cleared later in this function */ |
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245 |
67
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246 st->rxdtx_N_elapsed = add (st->rxdtx_N_elapsed, 1); |
66
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247 |
67
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248 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0) |
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249 { |
67
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250 st->rxdtx_aver_period = DTX_HANGOVER; |
66
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251 } |
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252 else |
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253 { |
192
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254 if (st->rxdtx_N_elapsed > DTX_ELAPSED_THRESHOLD) |
66
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255 { |
67
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256 st->rxdtx_ctrl |= RX_UPD_SID_QUANT_MEM; |
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diff
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|
257 st->rxdtx_N_elapsed = 0; |
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diff
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258 st->rxdtx_aver_period = 0; |
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66
diff
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259 st->L_pn_seed_rx = PN_INITIAL_SEED; |
66
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260 } |
67
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261 else if (st->rxdtx_aver_period == 0) |
66
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262 { |
67
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263 st->rxdtx_N_elapsed = 0; |
66
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264 } |
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265 else |
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266 { |
192
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119
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|
267 st->rxdtx_aver_period--; |
66
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268 } |
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269 } |
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270 |
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271 return; |
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272 } |
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273 |
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274 /************************************************************************* |
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275 * |
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276 * FUNCTION NAME: update_gain_code_history_rx |
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277 * |
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278 * PURPOSE: Update the fixed codebook gain parameter history of the |
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279 * decoder. The fixed codebook gain parameters kept in the buffer |
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280 * are used later for computing the reference fixed codebook |
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281 * gain parameter value. |
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282 * |
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283 * INPUTS: new_gain_code New fixed codebook gain value |
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284 * |
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285 * gain_code_old_tx[0..4*DTX_HANGOVER-1] |
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286 * Old fixed codebook gain history of decoder |
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287 * |
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288 * OUTPUTS: gain_code_old_tx[0..4*DTX_HANGOVER-1] |
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289 * Updated fixed codebk gain history of decoder |
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290 * |
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291 * RETURN VALUE: none |
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292 * |
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293 *************************************************************************/ |
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294 |
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|
295 void update_gain_code_history_rx ( |
67
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66
diff
changeset
|
296 struct EFR_decoder_state *st, |
58b64224d4ac
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66
diff
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|
297 Word16 new_gain_code |
66
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|
298 ) |
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|
299 { |
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|
300 /* Circular buffer */ |
67
58b64224d4ac
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66
diff
changeset
|
301 st->gain_code_old_rx[st->buf_p_rx] = new_gain_code; |
66
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|
302 |
192
0303ba213e1c
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119
diff
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|
303 if (st->buf_p_rx == (4 * DTX_HANGOVER - 1)) |
66
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|
304 { |
67
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66
diff
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|
305 st->buf_p_rx = 0; |
66
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|
306 } |
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|
307 else |
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|
308 { |
192
0303ba213e1c
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119
diff
changeset
|
309 st->buf_p_rx++; |
66
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|
310 } |
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|
311 |
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|
312 return; |
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|
313 } |
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|
314 |
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|
315 /************************************************************************* |
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|
316 * |
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|
317 * FUNCTION NAME: interpolate_CN_param |
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|
318 * |
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319 * PURPOSE: Interpolate a comfort noise parameter value over the comfort |
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|
320 * noise update period. |
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diff
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|
321 * |
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|
322 * INPUTS: old_param The older parameter of the interpolation |
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323 * (the endpoint the interpolation is started |
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|
324 * from) |
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|
325 * new_param The newer parameter of the interpolation |
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|
326 * (the endpoint the interpolation is ended to) |
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327 * rx_dtx_state State of the comfort noise insertion period |
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|
328 * |
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329 * OUTPUTS: none |
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330 * |
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331 * RETURN VALUE: Interpolated CN parameter value |
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332 * |
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333 *************************************************************************/ |
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334 |
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335 Word16 interpolate_CN_param ( |
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336 Word16 old_param, |
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337 Word16 new_param, |
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338 Word16 rx_dtx_state |
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339 ) |
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340 { |
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341 static const Word16 interp_factor[CN_INT_PERIOD] = |
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342 { |
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343 0x0555, 0x0aaa, 0x1000, 0x1555, 0x1aaa, 0x2000, |
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344 0x2555, 0x2aaa, 0x3000, 0x3555, 0x3aaa, 0x4000, |
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345 0x4555, 0x4aaa, 0x5000, 0x5555, 0x5aaa, 0x6000, |
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346 0x6555, 0x6aaa, 0x7000, 0x7555, 0x7aaa, 0x7fff}; |
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347 Word16 temp; |
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348 Word32 L_temp; |
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349 |
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350 L_temp = L_mult (interp_factor[rx_dtx_state], new_param); |
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351 temp = sub (0x7fff, interp_factor[rx_dtx_state]); |
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352 temp = add (temp, 1); |
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353 L_temp = L_mac (L_temp, temp, old_param); |
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354 temp = round (L_temp); |
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355 |
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356 return temp; |
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357 } |
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358 |
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359 /************************************************************************* |
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360 * |
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361 * FUNCTION NAME: interpolate_CN_lsf |
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362 * |
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363 * PURPOSE: Interpolate comfort noise LSF parameter vector over the comfort |
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364 * noise update period. |
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365 * |
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366 * INPUTS: lsf_old_CN[0..9] |
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367 * The older LSF parameter vector of the |
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368 * interpolation (the endpoint the interpolation |
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369 * is started from) |
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370 * lsf_new_CN[0..9] |
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371 * The newer LSF parameter vector of the |
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372 * interpolation (the endpoint the interpolation |
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373 * is ended to) |
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374 * rx_dtx_state State of the comfort noise insertion period |
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375 * |
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376 * OUTPUTS: lsf_interp_CN[0..9] |
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377 * Interpolated LSF parameter vector |
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378 * |
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379 * RETURN VALUE: none |
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380 * |
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381 *************************************************************************/ |
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382 |
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383 void interpolate_CN_lsf ( |
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384 Word16 lsf_old_CN[M], |
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385 Word16 lsf_new_CN[M], |
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386 Word16 lsf_interp_CN[M], |
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387 Word16 rx_dtx_state |
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388 ) |
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389 { |
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390 Word16 i; |
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391 |
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392 for (i = 0; i < M; i++) |
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393 { |
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394 lsf_interp_CN[i] = interpolate_CN_param (lsf_old_CN[i], |
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395 lsf_new_CN[i], |
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396 rx_dtx_state); move16 (); |
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397 } |
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398 |
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399 return; |
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400 } |