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annotate libgsmfr2/tw_gsmfr.h @ 258:c344b4f35eb7

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libgsmfr2: implement gsmfr_pack_frame()
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Apr 2024 22:30:24 +0000
parents a33edf624061
children bebae251e5ee
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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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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 /* Rx DTX handler preprocessor portion of the library */
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70
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71 struct gsmfr_preproc_state; /* opaque to external users */
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72
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73 struct gsmfr_preproc_state *gsmfr_preproc_create(void);
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74 /* use standard free() call to free it afterward */
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75
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76 /* reset state to initial */
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77 void gsmfr_preproc_reset(struct gsmfr_preproc_state *state);
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78
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79 /* main processing functions */
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80 void gsmfr_preproc_good_frame(struct gsmfr_preproc_state *state,
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81 uint8_t *frame);
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82 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *state, int taf,
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83 uint8_t *frame_out);
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84
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85 /* utility function */
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86 int gsmfr_preproc_sid_classify(const uint8_t *frame);
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87
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88 /* utility datum */
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89 extern const uint8_t gsmfr_preproc_silence_frame[GSMFR_RTP_FRAME_LEN];
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90
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91 /*
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92 * Full GSM-FR decoder: Rx DTX handler followed by 06.10 decoder,
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93 * plus the decoder homing function.
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94 */
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95
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96 struct gsmfr_fulldec_state; /* opaque to external users */
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97
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98 struct gsmfr_fulldec_state *gsmfr_fulldec_create(void);
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99 /* use standard free() call to free it afterward */
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100
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101 /* reset state to initial */
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102 void gsmfr_fulldec_reset(struct gsmfr_fulldec_state *state);
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103
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104 /* main processing functions */
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105 void gsmfr_fulldec_good_frame(struct gsmfr_fulldec_state *state,
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106 const uint8_t *frame, int16_t *pcm);
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107 void gsmfr_fulldec_bfi(struct gsmfr_fulldec_state *state, int taf,
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108 int16_t *pcm);
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109
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110 /* utility datum */
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111 extern const uint8_t gsmfr_decoder_homing_frame[GSMFR_RTP_FRAME_LEN];
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112
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113 #endif /* include guard */