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annotate libgsmfr2/tw_gsmfr.h @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +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 */