Struct alsa::direct::pcm::Control

pub struct Control(/* private fields */);

Write PCM appl ptr directly, bypassing alsa-lib.

Provides direct access to appl ptr and avail min, without the overhead of alsa-lib or a syscall. Caveats that apply to Status applies to this struct too.

Implementations

impl Control

pub fn new(p: &PCM) -> Result<Self>

pub fn from_fd(fd: RawFd) -> Result<Self>

pub fn appl_ptr(&self) -> Frames

Read number of frames application has read or written

This value wraps at “boundary” (a large value you can read from SwParams).

pub fn set_appl_ptr(&self, value: Frames)

Set number of frames application has read or written

When the kernel wakes up due to a period interrupt, this value will be checked by the kernel. An XRUN will happen in case the application has not read or written enough data.

pub fn avail_min(&self) -> Frames

Read minimum number of frames in buffer in order to wakeup process

pub fn set_avail_min(&self, value: Frames)

Write minimum number of frames in buffer in order to wakeup process

Trait Implementations

impl Debug for Control

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.