jibuf.c File Reference

Osmocom Jitter Buffer helpers. More...

#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/utils.h>
#include <osmocom/netif/amr.h>
#include <osmocom/netif/rtp.h>
#include <osmocom/netif/jibuf.h>
#include <arpa/inet.h>

Data Structures
struct	osmo_jibuf_msgb_cb

Macros
#define	SAMPLES_PER_PKT   160
#define	SAMPLE_RATE   8000
#define	JIBUF_DEFAULT_MIN_DELAY_MS   60
#define	JIBUF_DEFAULT_MAX_DELAY_MS   200
#define	JIBUF_REFERENCE_TS_FREQ   60
#define	JIBUF_BUFFER_RECALC_FREQ   40
#define	JIBUF_ALLOWED_PKT_DROP   3
#define	JIBUF_ALLOWED_PKT_CONSECUTIVE_DROP   1
#define	JIBUF_BUFFER_INC_STEP   20
#define	JIBUF_BUFFER_DEC_STEP   5
#define	JIBUF_SKEW_WEIGHT   ((double)1/32)
#define	JIBUF_MSGB_CB(__msgb)   ((struct osmo_jibuf_msgb_cb *)&((__msgb)->cb[0]))

Functions
static void	ms2timeval (struct timeval *ts, uint32_t ms)
static uint32_t	timeval2ms (const struct timeval *ts)
static int	clock_gettime_timeval (clockid_t clk_id, struct timeval *tp)
static struct timeval *	msgb_scheduled_ts (const struct msgb *msg)
static void	llist_add_sorted (struct msgb *msg, struct llist_head *msg_list)
static void	enqueue_pkt (struct osmo_jibuf *jb, struct msgb *msg, bool is_syncpoint)
static bool	msg_get_marker (struct msgb *msg)
static uint16_t	msg_get_sequence (struct msgb *msg)
static uint32_t	msg_get_timestamp (struct msgb *msg)
static int32_t	samples2ms (int32_t samples)
static int	calc_pkt_rel_delay (struct osmo_jibuf *jb, struct msgb *msg)
static bool	msg_is_in_sequence (struct osmo_jibuf *jb, struct msgb *msg)
static bool	msg_is_syncpoint (struct osmo_jibuf *jb, struct msgb *msg)
static void	msg_set_as_reference (struct osmo_jibuf *jb, struct msgb *msg)
static void	dequeue_msg (struct osmo_jibuf *jb, struct msgb *msg)
static void	timer_expired (void *data)
static void	recalc_clock_skew (struct osmo_jibuf *jb, int32_t rel_delay)
static void	recalc_threshold_delay (struct osmo_jibuf *jb)
struct osmo_jibuf *	osmo_jibuf_alloc (void *talloc_ctx)
	Allocate a new jitter buffer instance. More...
void	osmo_jibuf_delete (struct osmo_jibuf *jb)
	Destroy a previously allocated jitter buffer instance. More...
int	osmo_jibuf_enqueue (struct osmo_jibuf *jb, struct msgb *msg)
	Try to enqueue a packet into the jitter buffer. More...
bool	osmo_jibuf_empty (struct osmo_jibuf *jb)
	Check whether the jitter buffer instance has packets queued or not. More...
void	osmo_jibuf_set_min_delay (struct osmo_jibuf *jb, uint32_t min_delay)
	Set minimum buffer size for the jitter buffer. More...
void	osmo_jibuf_set_max_delay (struct osmo_jibuf *jb, uint32_t max_delay)
	Set maximum buffer size for the jitter buffer. More...
void	osmo_jibuf_enable_skew_compensation (struct osmo_jibuf *jb, bool enable)
	Toggle use of skew detection and compensation mechanism. More...
void	osmo_jibuf_set_dequeue_cb (struct osmo_jibuf *jb, osmo_jibuf_dequeue_cb dequeue_cb, void *cb_data)
	Set dequeue callback for the jitter buffer. More...

Detailed Description

Osmocom Jitter Buffer helpers.