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annotate src/twjit.c @ 15:355de6301404

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twjit: simplify create API, factor out clock & quantum config
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 Jul 2024 21:31:16 +0000
parents 95f6c8ce33b0
children 58e9719d1a84
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1 /*
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2 * Themyscira Wireless jitter buffer implementation: main body.
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3 */
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4
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5 #include <stdint.h>
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6 #include <stdbool.h>
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7 #include <string.h>
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9 #include <osmocom/core/linuxlist.h>
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10 #include <osmocom/core/msgb.h>
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11 #include <osmocom/core/talloc.h>
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12 #include <osmocom/core/utils.h>
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14 #include <themwi/rtp/twjit.h>
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16 void twrtp_jibuf_init_defaults(struct twrtp_jibuf_config *config)
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17 {
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18 memset(config, 0, sizeof(struct twrtp_jibuf_config));
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19 config->bd_start = 2; /* smallest allowed */
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20 config->bd_hiwat = 3; /* Nstart+1 is practically-useful minimum */
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21 config->thinning_int = 17; /* prime number, usually 340 ms */
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22 config->max_future_sec = 10; /* 10 s is a long time for voice */
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23 }
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25 /* create and destroy functions */
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27 struct twrtp_jibuf_inst *
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28 twrtp_jibuf_create(void *ctx, struct twrtp_jibuf_config *config)
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29 {
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30 struct twrtp_jibuf_inst *twjit;
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32 twjit = talloc_zero(ctx, struct twrtp_jibuf_inst);
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33 if (!twjit)
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34 return NULL;
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36 twjit->ext_config = config;
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37 twjit->state = TWJIT_STATE_EMPTY;
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38 INIT_LLIST_HEAD(&twjit->sb[0].queue);
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39 INIT_LLIST_HEAD(&twjit->sb[1].queue);
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40 /* default of 8 kHz clock, 20 ms quantum */
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41 twrtp_jibuf_set_ts_quant(twjit, 8, 20);
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43 return twjit;
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44 }
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46 void twrtp_jibuf_destroy(struct twrtp_jibuf_inst *twjit)
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47 {
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48 msgb_queue_free(&twjit->sb[0].queue);
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49 msgb_queue_free(&twjit->sb[1].queue);
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50 talloc_free(twjit);
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51 }
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53 /* basic housekeeping */
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55 void twrtp_jibuf_set_ts_quant(struct twrtp_jibuf_inst *twjit,
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56 uint16_t clock_khz, uint16_t quantum_ms)
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57 {
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58 twjit->ts_quantum = (uint32_t) quantum_ms * clock_khz;
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59 twjit->quanta_per_sec = 1000 / quantum_ms;
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60 twjit->ts_units_per_ms = clock_khz;
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61 twjit->ts_units_per_sec = (uint32_t) clock_khz * 1000;
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62 twjit->ns_to_ts_units = 1000000 / clock_khz;
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63 }