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annotate libtwamr/c2_9pf.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 ee64aabcc7a0
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 : c2_9pf.h
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11 * Purpose : Searches a 9 bit algebraic codebook containing
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12 * 2 pulses in a frame of 40 samples.
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13 *
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14 *****************************************************************************
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15 */
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16 #ifndef c2_9pf_h
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17 #define c2_9pf_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 "typedef.h"
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25
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26 /*
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27 *****************************************************************************
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28 * LOCAL VARIABLES AND TABLES
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29 *****************************************************************************
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30 */
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31
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32 /*
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33 *****************************************************************************
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34 * DEFINITION OF DATA TYPES
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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 * DECLARATION OF PROTOTYPES
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41 *****************************************************************************
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42 */
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43 /*************************************************************************
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44 *
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45 * FUNCTION: code_2i40_9bits()
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46 *
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47 * PURPOSE: Searches a 9 bit algebraic codebook containing 2 pulses
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48 * in a frame of 40 samples.
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49 *
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50 * DESCRIPTION:
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51 * The code length is 40, containing 2 nonzero pulses: i0...i1.
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52 * All pulses can have two possible amplitudes: +1 or -1.
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53 * Pulse i0 can have 8 possible positions, pulse i1 can have
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54 * 8 positions. Also coded is which track pair should be used,
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55 * i.e. first or second pair. Where each pair contains 2 tracks.
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56 *
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57 * First subframe:
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58 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
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59 * i1 : 2, 7, 12, 17, 22, 27, 32, 37.
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60 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
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61 * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
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62 *
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63 * Second subframe:
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64 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
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65 * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
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66 * second i0 : 2, 7, 12, 17, 22, 27, 32, 37.
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67 * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
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68 *
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69 * Third subframe:
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70 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
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71 * i1 : 2, 7, 12, 17, 22, 27, 32, 37.
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72 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
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73 * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
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74 *
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75 * Fourth subframe:
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76 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
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77 * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
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78 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
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79 * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
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80 *
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81 *************************************************************************/
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82
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83 Word16 code_2i40_9bits(
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84 Word16 subNr, /* i : subframe number */
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85 Word16 x[], /* i : target vector */
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86 Word16 h[], /* i : impulse response of weighted synthesis filter */
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87 /* h[-L_subfr..-1] must be set to zero. */
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88 Word16 T0, /* i : Pitch lag */
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89 Word16 pitch_sharp, /* i : Last quantized pitch gain */
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90 Word16 code[], /* o : Innovative codebook */
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91 Word16 y[], /* o : filtered fixed codebook excitation */
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92 Word16 * sign /* o : Signs of 2 pulses */
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93 );
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94
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95 #endif