spa_io_clock Struct Reference

Absolute time reporting. More...

Data Fields
uint32_t	flags
	clock flags More...
uint32_t	id
	unique clock id, set by application More...
char	name [64]
	clock name prefixed with API, set by node. More...
uint64_t	nsec
	time in nanoseconds against monotonic clock More...
struct spa_fraction	rate
	rate for position/duration/delay More...
uint64_t	position
	current position More...
uint64_t	duration
	duration of current cycle More...
int64_t	delay
	delay between position and hardware, positive for capture, negative for playback More...
double	rate_diff
	rate difference between clock and monotonic time More...
uint64_t	next_nsec
	estimated next wakeup time in nanoseconds More...
uint32_t	padding [8]

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

delay

int64_t spa_io_clock::delay

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

duration

uint64_t spa_io_clock::duration

duration of current cycle

flags

uint32_t spa_io_clock::flags

clock flags

id

uint32_t spa_io_clock::id

unique clock id, set by application

name

char spa_io_clock::name[64]

clock name prefixed with API, set by node.

The clock name is unique per clock and can be used to check if nodes share the same clock.

next_nsec

uint64_t spa_io_clock::next_nsec

estimated next wakeup time in nanoseconds

nsec

uint64_t spa_io_clock::nsec

time in nanoseconds against monotonic clock

padding

uint32_t spa_io_clock::padding[8]

position

uint64_t spa_io_clock::position

current position

rate

struct spa_fraction spa_io_clock::rate

rate for position/duration/delay

rate_diff

double spa_io_clock::rate_diff

rate difference between clock and monotonic time

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

• io.h