FreeCalypso > hg > gsm-codec-lib
annotate libgsmfr2/tw_gsmfr.h @ 495:aee13079db3c
libgsmhr1: implement SID reset
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 17 Jun 2024 23:25:19 +0000 |
parents | bebae251e5ee |
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rev | line source |
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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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17 |
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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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20 |
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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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28 |
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29 struct gsmfr_0610_state; /* opaque to external users */ |
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30 |
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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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36 |
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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 |
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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_bfi(struct gsmfr_preproc_state *state, int taf, |
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88 uint8_t *frame_out); |
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89 |
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90 /* utility function */ |
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91 int gsmfr_preproc_sid_classify(const uint8_t *frame); |
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92 |
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93 /* utility datum */ |
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94 extern const uint8_t gsmfr_preproc_silence_frame[GSMFR_RTP_FRAME_LEN]; |
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95 |
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96 /* |
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97 * Full GSM-FR decoder: Rx DTX handler followed by 06.10 decoder, |
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98 * plus the decoder homing function. |
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99 */ |
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100 |
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101 struct gsmfr_fulldec_state; /* opaque to external users */ |
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102 |
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103 struct gsmfr_fulldec_state *gsmfr_fulldec_create(void); |
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104 /* use standard free() call to free it afterward */ |
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105 |
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106 /* reset state to initial */ |
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107 void gsmfr_fulldec_reset(struct gsmfr_fulldec_state *state); |
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108 |
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109 /* main processing functions */ |
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110 void gsmfr_fulldec_good_frame(struct gsmfr_fulldec_state *state, |
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111 const uint8_t *frame, int16_t *pcm); |
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112 void gsmfr_fulldec_bfi(struct gsmfr_fulldec_state *state, int taf, |
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113 int16_t *pcm); |
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114 |
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115 /* utility datum */ |
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116 extern const uint8_t gsmfr_decoder_homing_frame[GSMFR_RTP_FRAME_LEN]; |
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117 |
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118 #endif /* include guard */ |