Absolute time reporting. More...

#include <spa/node/io.h>

Data Fields
uint32_t	flags
	clock flags

uint32_t	id
	unique clock id, set by application

uint64_t	nsec
	time in nanoseconds against monotonic clock

struct spa_fraction	rate
	rate for position/duration/delay/xrun

uint64_t	position
	current position

uint64_t	duration
	duration of current cycle

int64_t	delay
	delay between position and hardware, positive for capture, negative for playback

double	rate_diff
	rate difference between clock and monotonic time

uint64_t	next_nsec
	estimated next wakeup time in nanoseconds

struct spa_fraction	target_rate
	target rate of next cycle

uint64_t	target_duration
	target duration of next cycle

uint32_t	target_seq
	seq counter.

uint32_t	padding

uint64_t	xrun
	estimated accumulated xrun duration

Detailed Description

Absolute time reporting.

Nodes that can report clocking information will receive this io block. The application sets the id. This is usually set as part of the position information but can also be set separately.

The clock counts the elapsed time according to the clock provider since the provider was last started.

Field Documentation

◆ flags

uint32_t spa_io_clock::flags

clock flags

◆ id

uint32_t spa_io_clock::id

unique clock id, set by application

◆ nsec

uint64_t spa_io_clock::nsec

time in nanoseconds against monotonic clock

◆ rate

struct spa_fraction spa_io_clock::rate

rate for position/duration/delay/xrun

◆ position

uint64_t spa_io_clock::position

current position

◆ duration

uint64_t spa_io_clock::duration

duration of current cycle

Examples: audio-dsp-filter.c, and audio-dsp-src.c.

◆ delay

int64_t spa_io_clock::delay

delay between position and hardware, positive for capture, negative for playback

◆ rate_diff

double spa_io_clock::rate_diff

rate difference between clock and monotonic time

◆ next_nsec

uint64_t spa_io_clock::next_nsec

estimated next wakeup time in nanoseconds

◆ target_rate

struct spa_fraction spa_io_clock::target_rate

target rate of next cycle

◆ target_duration

uint64_t spa_io_clock::target_duration

target duration of next cycle

◆ target_seq

uint32_t spa_io_clock::target_seq

seq counter.

must be equal at start and end of read and lower bit must be 0

◆ padding

uint32_t spa_io_clock::padding

◆ xrun

uint64_t spa_io_clock::xrun

estimated accumulated xrun duration

The documentation for this struct was generated from the following file:

spa/node/io.h

Data Fields