FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/sid_sync.c @ 449:2af2b5c12268
Library-versions: libtwamr is officially version 1.0.0
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 01:43:05 +0000 |
parents | a8b73b1c5b19 |
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1 /* |
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2 ***************************************************************************** |
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3 * |
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 |
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5 * R99 Version 3.3.0 |
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6 * REL-4 Version 4.1.0 |
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7 * |
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8 ***************************************************************************** |
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9 * |
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10 * File : sid_sync.c |
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11 * |
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12 ***************************************************************************** |
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13 */ |
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14 /* |
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15 ***************************************************************************** |
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16 * MODULE INCLUDE FILE AND VERSION ID |
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17 ***************************************************************************** |
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18 */ |
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19 #include "namespace.h" |
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20 #include "sid_sync.h" |
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21 |
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22 /* |
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23 ***************************************************************************** |
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24 * INCLUDE FILES |
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25 ***************************************************************************** |
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26 */ |
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27 #include "tw_amr.h" |
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28 #include "typedef.h" |
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29 #include "basic_op.h" |
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30 #include "no_count.h" |
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31 |
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32 /* |
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33 ***************************************************************************** |
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34 * LOCAL VARIABLES AND TABLES |
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35 ***************************************************************************** |
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36 */ |
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37 |
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38 /* |
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39 ***************************************************************************** |
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40 * PUBLIC PROGRAM CODE |
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41 ***************************************************************************** |
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42 */ |
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43 |
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44 void sid_sync_reset (sid_syncState *st) |
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45 { |
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46 st->sid_update_rate = 8; |
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47 st->sid_update_counter = 3; |
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48 st->sid_handover_debt = 0; |
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49 st->prev_ft = TX_SPEECH_GOOD; |
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50 } |
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51 |
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52 int sid_sync_set_handover_debt (sid_syncState *st, |
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53 Word16 debtFrames) |
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54 { |
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55 /* debtFrames >= 0 */ |
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56 st->sid_handover_debt = debtFrames; |
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57 return 0; |
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58 } |
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59 |
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60 void sid_sync (sid_syncState *st, enum Mode mode, |
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61 enum TXFrameType *tx_frame_type) |
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62 { |
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63 if (mode == MRDTX) |
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64 { |
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65 st->sid_update_counter--; |
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66 if (st->prev_ft == TX_SPEECH_GOOD) |
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67 { |
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68 *tx_frame_type = TX_SID_FIRST; |
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69 st->sid_update_counter = 3; |
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70 } |
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71 else |
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72 { |
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73 /* TX_SID_UPDATE or TX_NO_DATA */ |
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74 if ((st->sid_handover_debt > 0) && |
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75 (st->sid_update_counter > 2) ) |
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76 { |
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77 /* ensure extra updates are properly delayed after |
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78 a possible SID_FIRST */ |
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79 *tx_frame_type = TX_SID_UPDATE; |
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80 st->sid_handover_debt--; |
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81 } |
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82 else |
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83 { |
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84 if (st->sid_update_counter == 0) |
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85 { |
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86 *tx_frame_type = TX_SID_UPDATE; |
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87 st->sid_update_counter = st->sid_update_rate; |
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88 } else { |
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89 *tx_frame_type = TX_NO_DATA; |
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90 } |
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91 } |
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92 } |
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93 } |
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94 else |
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95 { |
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96 st->sid_update_counter = st->sid_update_rate ; |
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97 *tx_frame_type = TX_SPEECH_GOOD; |
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98 } |
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99 st->prev_ft = *tx_frame_type; |
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100 } |