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annotate libtwamr/c_g_aver.h @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents dc3b7caa59c4
children
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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 : c_g_aver.h
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11 * Purpose : Background noise source charateristic detector (SCD)
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef c_g_aver_h
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16 #define c_g_aver_h "$Id $"
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17
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18 /*
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19 ********************************************************************************
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20 * INCLUDE FILES
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21 ********************************************************************************
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22 */
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23 #include "tw_amr.h"
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24 #include "typedef.h"
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25 #include "cnst.h"
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26
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27 /*
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28 ********************************************************************************
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29 * LOCAL VARIABLES AND TABLES
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30 ********************************************************************************
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31 */
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32 #define L_CBGAINHIST 7
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33
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34 /*
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35 ********************************************************************************
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36 * DEFINITION OF DATA TYPES
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37 ********************************************************************************
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38 */
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39 typedef struct{
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40 /* history vector of past synthesis speech energy */
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41 Word16 cbGainHistory[L_CBGAINHIST];
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42
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43 /* state flags */
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44 Word16 hangVar; /* counter; */
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45 Word16 hangCount; /* counter; */
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46
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47 } Cb_gain_averageState;
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48
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49 /*
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50 ********************************************************************************
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51 * DECLARATION OF PROTOTYPES
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52 ********************************************************************************
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53 */
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54 /*
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55 **************************************************************************
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56 *
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57 * Function : Cb_gain_average_reset
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58 * Purpose : Resets state memory
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59 * Returns : 0 on success
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60 *
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61 **************************************************************************
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62 */
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63 void Cb_gain_average_reset (Cb_gain_averageState *st);
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64
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65 /*
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66 **************************************************************************
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67 *
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68 * Function : Cb_gain_average
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69 * Purpose : Charaterice synthesis speech and detect background noise
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70 * Returns : background noise decision; 0 = bgn, 1 = no bgn
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71 *
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72 **************************************************************************
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73 */
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74 Word16 Cb_gain_average (
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75 Cb_gain_averageState *st, /* i/o : State variables for CB gain avergeing */
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76 enum Mode mode, /* i : AMR mode */
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77 Word16 gain_code, /* i : CB gain Q1 */
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78 Word16 lsp[], /* i : The LSP for the current frame Q15 */
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79 Word16 lspAver[], /* i : The average of LSP for 8 frames Q15 */
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80 Word16 bfi, /* i : bad frame indication flag */
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81 Word16 prev_bf, /* i : previous bad frame indication flag */
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82 Word16 pdfi, /* i : potential degraded bad frame ind flag */
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83 Word16 prev_pdf, /* i : prev pot. degraded bad frame ind flag */
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84 Word16 inBackgroundNoise, /* i : background noise decision */
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85 Word16 voicedHangover /* i : # of frames after last voiced frame */
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86 );
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87
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88 #endif