FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/sid_sync.c @ 470:ea89eb8291bf

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libgsmefr: add RTP-encoded DHF const datum to public API
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 14 May 2024 07:13:59 +0000
parents a8b73b1c5b19
children
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a8b73b1c5b19 libtwamr: integrate sid_sync.c
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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 }