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annotate libtwamr/lsp.h @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 550d3594c878
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 : lsp.h
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11 * Purpose : Conversion from A(z) to LSP. Quantization and
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12 * interpolation of LSPs.
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef lsp_h
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17 #define lsp_h "$Id $"
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18
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19 /*
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20 ********************************************************************************
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21 * INCLUDE FILES
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22 ********************************************************************************
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23 */
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24 #include "tw_amr.h"
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25 #include "typedef.h"
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26 #include "q_plsf.h"
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27
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28 /*
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29 ********************************************************************************
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30 * LOCAL VARIABLES AND TABLES
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31 ********************************************************************************
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32 */
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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 /* Past LSPs */
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41 Word16 lsp_old[M];
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42 Word16 lsp_old_q[M];
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43
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44 /* Quantization state */
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45 Q_plsfState qSt;
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46 } lspState;
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47
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48 /*
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49 ********************************************************************************
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50 * DECLARATION OF PROTOTYPES
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51 ********************************************************************************
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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 : lsp_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 lsp_reset (lspState *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 : lsp
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69 * Purpose : Conversion from LP coefficients to LSPs.
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70 * Quantization of LSPs.
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71 * Description : Generates 2 sets of LSPs from 2 sets of
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72 * LP coefficients for mode 12.2. For the other
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73 * modes 1 set of LSPs is generated from 1 set of
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74 * LP coefficients. These LSPs are quantized with
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75 * Matrix/Vector quantization (depending on the mode)
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76 * and interpolated for the subframes not yet having
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77 * their own LSPs.
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78 *
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79 **************************************************************************
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80 */
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81 int lsp(lspState *st, /* i/o : State struct */
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82 enum Mode req_mode, /* i : requested coder mode */
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83 enum Mode used_mode, /* i : used coder mode */
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84 Word16 az[], /* i/o : interpolated LP parameters Q12 */
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85 Word16 azQ[], /* o : quantization interpol. LP parameters Q12*/
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86 Word16 lsp_new[], /* o : new lsp vector */
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87 Word16 **anap /* o : analysis parameters */
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88 );
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89
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90 #endif