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annotate libgsmfr2/tw_gsmfr.h @ 542:f2d0f2f15d5f

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libgsmefr: add wrapper for TW-TS-001 RTP input
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 28 Sep 2024 06:38:08 +0000
parents 3a617e4e9b27
children
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1 /*
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2 * This header file is the external public interface to libgsmfr2:
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3 * Themyscira Wireless implementation of GSM FRv1 speech codec
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4 * that includes not only the core transcoding functions of GSM 06.10,
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5 * but also Rx DTX functions (substitution and muting per GSM 06.11,
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6 * comfort noise per GSM 06.12, overall Rx DTX control per GSM 06.31)
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7 * in the decoder direction and the optional homing frame mechanism.
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8 *
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9 * This header file should be installed in some system include directory
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10 * such that it can be included by C sources as <tw_gsmfr.h>.
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11 */
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12
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13 #ifndef __THEMWI_GSMFR_H
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14 #define __THEMWI_GSMFR_H
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15
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16 #include <stdint.h>
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18 #define GSMFR_RTP_FRAME_LEN 33
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19 #define GSMFR_NUM_PARAMS 76
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21 /*
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22 * GSM 06.10 encoder & decoder portion of the library
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23 *
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24 * This part is peculiar in that the same state structure is used for
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25 * both the encoder and the decoder - however, each given instance
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26 * of this state structure must be used for only one of the two.
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27 */
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29 struct gsmfr_0610_state; /* opaque to external users */
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31 struct gsmfr_0610_state *gsmfr_0610_create(void);
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32 /* use standard free() call to free it afterward */
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33
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34 /* reset state to initial */
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35 void gsmfr_0610_reset(struct gsmfr_0610_state *state);
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37 /* interface structure for passing frames of codec parameters */
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38
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39 struct gsmfr_param_frame {
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40 int16_t LARc[8];
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41 int16_t Nc[4];
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42 int16_t bc[4];
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43 int16_t Mc[4];
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44 int16_t xmaxc[4];
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45 int16_t xMc[4][13];
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46 };
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47
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48 /* encoder public functions */
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49
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50 void gsmfr_0610_encode_params(struct gsmfr_0610_state *st, const int16_t *pcm,
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51 struct gsmfr_param_frame *param);
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52 void gsmfr_0610_encode_frame(struct gsmfr_0610_state *st, const int16_t *pcm,
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53 uint8_t *frame);
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54 void gsmfr_0610_encoder_homing(struct gsmfr_0610_state *st, const int16_t *pcm);
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55
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56 /* decoder public functions */
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57
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58 void gsmfr_0610_decode_params(struct gsmfr_0610_state *st,
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59 const struct gsmfr_param_frame *param,
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60 int16_t *pcm);
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61 void gsmfr_0610_decode_frame(struct gsmfr_0610_state *st, const uint8_t *frame,
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62 int16_t *pcm);
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63
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64 /* conversion between RTP packed format and struct gsmfr_param_frame */
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65
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66 void gsmfr_pack_frame(const struct gsmfr_param_frame *param, uint8_t *frame);
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67 void gsmfr_unpack_frame(const uint8_t *frame, struct gsmfr_param_frame *param);
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68
259
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69 /* similar conversions with a linear array of params */
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70
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71 void gsmfr_pack_from_array(const int16_t *params, uint8_t *frame);
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72 void gsmfr_unpack_to_array(const uint8_t *frame, int16_t *params);
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73
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74 /* Rx DTX handler preprocessor portion of the library */
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75
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76 struct gsmfr_preproc_state; /* opaque to external users */
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77
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78 struct gsmfr_preproc_state *gsmfr_preproc_create(void);
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79 /* use standard free() call to free it afterward */
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80
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81 /* reset state to initial */
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82 void gsmfr_preproc_reset(struct gsmfr_preproc_state *state);
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83
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84 /* main processing functions */
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85 void gsmfr_preproc_good_frame(struct gsmfr_preproc_state *state,
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86 uint8_t *frame);
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87 void gsmfr_preproc_good_frame_hm(struct gsmfr_preproc_state *state,
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88 uint8_t *frame);
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89 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *state, int taf,
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90 uint8_t *frame_out);
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91 void gsmfr_preproc_bfi_bits(struct gsmfr_preproc_state *state,
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92 const uint8_t *bad_frame, int taf,
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93 uint8_t *frame_out);
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94
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95 /* utility function */
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96 int gsmfr_preproc_sid_classify(const uint8_t *frame);
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97
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98 /* utility datum */
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99 extern const uint8_t gsmfr_preproc_silence_frame[GSMFR_RTP_FRAME_LEN];
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100
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101 /*
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102 * Full GSM-FR decoder: Rx DTX handler followed by 06.10 decoder,
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103 * plus the decoder homing function.
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104 */
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105
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106 struct gsmfr_fulldec_state; /* opaque to external users */
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107
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108 struct gsmfr_fulldec_state *gsmfr_fulldec_create(void);
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109 /* use standard free() call to free it afterward */
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110
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111 /* reset state to initial */
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112 void gsmfr_fulldec_reset(struct gsmfr_fulldec_state *state);
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113
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114 /* main processing functions */
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115 void gsmfr_fulldec_good_frame(struct gsmfr_fulldec_state *state,
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116 const uint8_t *frame, int16_t *pcm);
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117 void gsmfr_fulldec_bfi(struct gsmfr_fulldec_state *state, int taf,
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118 int16_t *pcm);
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119 void gsmfr_fulldec_bfi_bits(struct gsmfr_fulldec_state *state,
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120 const uint8_t *bad_frame, int taf, int16_t *pcm);
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121
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122 /* handling of TW-TS-001 RTP input */
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123 int gsmfr_fulldec_rtp_in(struct gsmfr_fulldec_state *state,
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124 const uint8_t *rtp_pl, unsigned rtp_pl_len,
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125 int16_t *pcm);
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126
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127 /* utility datum */
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128 extern const uint8_t gsmfr_decoder_homing_frame[GSMFR_RTP_FRAME_LEN];
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129
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130 /* TFO transform API based on the preprocessor part of the library */
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131
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132 int gsmfr_tfo_xfrm_main(struct gsmfr_preproc_state *state,
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133 const uint8_t *rtp_in, unsigned rtp_in_len,
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134 uint8_t *frame_out);
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135 int gsmfr_tfo_xfrm_dtxd(struct gsmfr_preproc_state *state, uint8_t *frame_out);
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136
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137 /* sizes of state structures, to support alternative malloc schemes */
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138
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139 extern const unsigned gsmfr_0610_state_size;
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140 extern const unsigned gsmfr_preproc_state_size;
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141 extern const unsigned gsmfr_fulldec_state_size;
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142
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143 #endif /* include guard */