FreeCalypso > hg > themwi-rtp-lib

annotate include/twjit.h @ 12:323957bebd53

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twjit: smarter counting of underruns
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 Jul 2024 02:47:21 +0000
parents 4f82b9c07ddb
children 355de6301404
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1 /*
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2 * Themyscira Wireless jitter buffer implementation: definition of
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3 * structures and API functions.
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4 */
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5
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6 #pragma once
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7
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8 #include <stdint.h>
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9 #include <stdbool.h>
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11 #include <osmocom/core/linuxlist.h>
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12 #include <osmocom/core/timer.h>
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13
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14 /*
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15 * twjit configuration tunings, usually set via vty.
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16 */
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17 struct twrtp_jibuf_config {
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18 /* buffer depth: starting minimum and high watermark */
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19 uint16_t bd_start;
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20 uint16_t bd_hiwat;
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21 /* interval for thinning of too-deep standing queue */
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22 uint16_t thinning_int;
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23 /* guard against time traveler RTP packets */
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24 uint16_t max_future_sec;
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25 /* min and max time delta in starting state, 0 means not set */
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26 uint16_t start_min_delta;
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27 uint16_t start_max_delta;
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28 };
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29
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30 /*
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31 * Stats collected during the lifetime of a twjit instance.
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32 */
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33 struct twrtp_jibuf_stats {
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34 /* normal operation */
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35 uint32_t rx_packets;
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36 uint32_t delivered_pkt;
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37 uint32_t handovers_in;
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38 uint32_t handovers_out;
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39 /* undesirable, but not totally unexpected */
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40 uint32_t too_old;
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41 uint32_t underruns;
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42 uint32_t ho_underruns;
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43 uint32_t output_gaps;
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44 uint32_t thinning_drops;
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45 /* unusual error events */
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46 uint32_t bad_packets;
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47 uint32_t duplicate_ts;
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48 /* independent analysis of Rx packet stream */
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49 uint32_t ssrc_changes;
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50 uint32_t seq_skips;
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51 uint32_t seq_backwards;
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52 uint32_t seq_repeats;
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53 uint32_t intentional_gaps;
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54 uint32_t ts_resets;
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55 uint32_t jitter_max;
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56 };
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58 /*
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59 * Info collected from the incoming RTP data stream
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60 * for the purpose of generating RTCP reception report blocks.
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61 */
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62 struct twrtp_jibuf_rr_info {
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63 uint32_t rx_packets;
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64 uint32_t base_seq;
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65 uint32_t max_seq_ext;
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66 uint32_t expected_pkt;
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67 uint32_t jitter_accum;
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68 };
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69
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70 /*
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71 * Each twjit instance has two sub-buffers; each subbuf is a queue of
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72 * received RTP packets that have the same SSRC and whose timestamps
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73 * increment in the expected cadence, with each ts delta being an
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74 * integral multiple of the samples-per-quantum constant.
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75 */
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76 struct twrtp_jibuf_sub {
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77 uint32_t ssrc;
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78 uint32_t head_ts;
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79 struct llist_head queue;
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80 uint32_t depth;
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81 uint32_t delta_ms; /* used only in starting state */
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82 /* thinning mechanism */
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83 uint16_t drop_int_count;
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84 /* running config for this subbuf */
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85 struct twrtp_jibuf_config conf;
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86 };
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87
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88 /*
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89 * Each twjit instance is in one of 4 fundamental states at any moment,
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90 * as enumerated here.
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91 */
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92 enum twrtp_jibuf_state {
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93 TWJIT_STATE_EMPTY,
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94 TWJIT_STATE_HUNT,
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95 TWJIT_STATE_FLOWING,
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96 TWJIT_STATE_HANDOVER,
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97 };
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98
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99 /* Main structure for one instance of twjit */
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100 struct twrtp_jibuf_inst {
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101 /* pointer to config structure given to twrtp_jibuf_create(),
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102 * memory must remain valid, but content can change at any time. */
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103 struct twrtp_jibuf_config *ext_config;
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104 /* count of RTP timestamp units per quantum */
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105 uint32_t ts_quantum;
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106 /* quanta per second, used to scale max_future_sec */
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107 uint16_t quanta_per_sec;
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108 /* scaling factors for time delta conversions */
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109 uint16_t ts_units_per_ms;
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110 uint32_t ts_units_per_sec;
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111 uint32_t ns_to_ts_units;
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112 /* operational state */
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113 enum twrtp_jibuf_state state;
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114 struct twrtp_jibuf_sub sb[2];
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115 uint8_t read_sb; /* 0 or 1 */
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116 uint8_t write_sb; /* ditto */
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117 /* info about the most recent Rx packet */
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118 uint32_t last_ssrc;
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119 uint32_t last_ts;
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120 uint16_t last_seq;
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121 bool got_first_packet;
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122 struct timespec last_arrival;
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123 uint32_t last_arrival_delta;
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124 /* analytics for RTCP RR */
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125 struct twrtp_jibuf_rr_info rr_info;
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126 /* stats over lifetime of this instance */
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127 struct twrtp_jibuf_stats stats;
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128 };
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129
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130 /* twjit module API functions */
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131
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132 struct twrtp_jibuf_inst *twrtp_jibuf_create(void *ctx, uint16_t quantum_ms,
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133 uint16_t clock_khz,
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134 struct twrtp_jibuf_config *config);
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135
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136 void twrtp_jibuf_destroy(struct twrtp_jibuf_inst *twjit);
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137
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138 struct msgb;
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139
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140 /* RTP input, takes ownership of msgb */
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141 void twrtp_jibuf_input(struct twrtp_jibuf_inst *twjit, struct msgb *msg);
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142
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143 /* output function, to be called by TDM/GSM/etc fixed-timing side */
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144 struct msgb *twrtp_jibuf_output(struct twrtp_jibuf_inst *twjit);
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145
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146 /* vty configuration functions */
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147
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148 void twrtp_jibuf_init_defaults(struct twrtp_jibuf_config *config);
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149
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150 void twrtp_jibuf_vty_init(int twjit_node);
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151
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152 struct vty;
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153
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154 int twrtp_jibuf_config_write(struct vty *vty,
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Mychaela Falconia <falcon@freecalypso.org>
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155 const struct twrtp_jibuf_config *conf,
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156 const char *name, const char *prefix);