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annotate libtwamr/tw_amr.h @ 553:ebcf414b7d99

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doc/TFO-transform: describe details for FRv1, both modes
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 07 Oct 2024 08:24:24 +0000
parents fa0652115168
children
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1 /*
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2 * This header file is the external public interface to libtwamr;
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3 * it should be installed in the same system include directory
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4 * as <tw_gsmfr.h> and <gsm_efr.h> for more classic GSM codecs.
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5 */
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6
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7 #ifndef __THEMWI_AMR_H
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8 #define __THEMWI_AMR_H
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9
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10 #include <stdint.h>
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11
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12 /* AMR definitions that matter for the public interface */
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13
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14 #define AMR_MAX_PRM 57 /* max. num. of params */
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15 #define AMR_IETF_MAX_PL 32 /* max bytes in RFC 4867 frame */
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16 #define AMR_IETF_HDR_LEN 6 /* .amr file header bytes */
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17 #define AMR_COD_WORDS 250 /* # of words in 3GPP test seq format */
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18
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19 enum RXFrameType {
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20 RX_SPEECH_GOOD = 0,
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21 RX_SPEECH_DEGRADED,
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22 RX_ONSET,
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23 RX_SPEECH_BAD,
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24 RX_SID_FIRST,
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25 RX_SID_UPDATE,
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26 RX_SID_BAD,
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27 RX_NO_DATA,
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28 RX_N_FRAMETYPES /* number of frame types */
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29 };
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30
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31 enum TXFrameType {
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32 TX_SPEECH_GOOD = 0,
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33 TX_SID_FIRST,
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34 TX_SID_UPDATE,
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35 TX_NO_DATA,
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36 TX_SPEECH_DEGRADED,
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37 TX_SPEECH_BAD,
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38 TX_SID_BAD,
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39 TX_ONSET,
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40 TX_N_FRAMETYPES /* number of frame types */
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41 };
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42
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43 enum Mode {
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44 MR475 = 0,
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45 MR515,
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46 MR59,
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47 MR67,
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48 MR74,
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49 MR795,
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50 MR102,
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51 MR122,
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52 MRDTX
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53 };
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54
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55 #define AMR_FT_NODATA 15
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56
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57 /* libtwamr encoder and decoder state */
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58
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59 struct amr_encoder_state; /* opaque to external users */
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60 struct amr_decoder_state; /* ditto */
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61
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62 struct amr_encoder_state *amr_encoder_create(int dtx, int use_vad2);
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63 struct amr_decoder_state *amr_decoder_create(void);
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64
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65 /* reset state to initial */
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66 void amr_encoder_reset(struct amr_encoder_state *st, int dtx, int use_vad2);
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67 void amr_decoder_reset(struct amr_decoder_state *st);
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68
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69 /* interface structure for passing frames of codec parameters */
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70
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71 struct amr_param_frame {
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72 uint8_t type;
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73 uint8_t mode;
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74 int16_t param[AMR_MAX_PRM];
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75 };
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76
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77 /* encoder and decoder main functions */
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78
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79 void amr_encode_frame(struct amr_encoder_state *st, enum Mode mode,
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80 const int16_t *pcm, struct amr_param_frame *frame);
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81
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82 void amr_decode_frame(struct amr_decoder_state *st,
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83 const struct amr_param_frame *frame, int16_t *pcm);
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84
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85 /* stateless utility functions: format conversions */
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86
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87 int amr_txtype_to_rxtype(enum TXFrameType tx_type, enum RXFrameType *rx_type);
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88
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89 unsigned amr_frame_to_ietf(const struct amr_param_frame *frame, uint8_t *bytes);
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90 int amr_frame_from_ietf(const uint8_t *bytes, struct amr_param_frame *frame);
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91 int amr_ietf_grok_first_octet(uint8_t fo);
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92
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93 void amr_frame_to_tseq(const struct amr_param_frame *frame, uint16_t *cod);
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94 int amr_frame_from_tseq(const uint16_t *cod, int use_rxtype,
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95 struct amr_param_frame *frame);
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96
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97 /* stateless function and const data for DHF detection */
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98
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99 int amr_check_dhf(const struct amr_param_frame *frame, int first_sub_only);
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100
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101 extern const int16_t amr_dhf_mr475[AMR_MAX_PRM];
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102 extern const int16_t amr_dhf_mr515[AMR_MAX_PRM];
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103 extern const int16_t amr_dhf_mr59[AMR_MAX_PRM];
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104 extern const int16_t amr_dhf_mr67[AMR_MAX_PRM];
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105 extern const int16_t amr_dhf_mr74[AMR_MAX_PRM];
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106 extern const int16_t amr_dhf_mr795[AMR_MAX_PRM];
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107 extern const int16_t amr_dhf_mr102[AMR_MAX_PRM];
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108 extern const int16_t amr_dhf_mr122[AMR_MAX_PRM];
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109 extern const int16_t amr_dhf_gsmefr[AMR_MAX_PRM];
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110
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111 /* DHF transformation on encoder output, for AMR-EFR emulation */
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112
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113 void amr_dhf_subst_efr(struct amr_param_frame *frame);
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114 void amr_dhf_subst_efr2(struct amr_param_frame *frame, const int16_t *pcm);
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115
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116 /* public const datum: RFC 4867 file header */
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117
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118 extern const uint8_t amr_file_header_magic[AMR_IETF_HDR_LEN];
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119
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120 #endif /* include guard */