Trait jack::ProcessHandler

pub trait ProcessHandler: Send {
    const SLOW_SYNC: bool = false;

    // Required method
    fn process(&mut self, _: &Client, _process_scope: &ProcessScope) -> Control;

    // Provided methods
    fn buffer_size(&mut self, _: &Client, _size: Frames) -> Control { ... }
    fn sync(
        &mut self,
        _: &Client,
        _state: TransportState,
        _pos: &TransportPosition
    ) -> bool { ... }
}

Specifies real-time processing.

Provided Associated Constants

const SLOW_SYNC: bool = false

Indicates whether or not this process handler represents a slow-sync client

Required Methods

fn process(&mut self, _: &Client, _process_scope: &ProcessScope) -> Control

Called whenever there is work to be done.

It needs to be suitable for real-time execution. That means that it cannot call functions that might block for a long time. This includes all I/O functions (disk, TTY, network), malloc, free, printf, pthread_mutex_lock, sleep, wait, poll, select, pthread_join, pthread_cond_wait, etc, etc.

Should return Control::Continue on success, and Control::Quit on error.

Provided Methods

fn buffer_size(&mut self, _: &Client, _size: Frames) -> Control

Called whenever the size of the buffer that will be passed to process is about to change, and once before the first call to process.

It is called on the same thread as process, but as an exception, does not need to be suitable for real-time execution, so it is allowed to allocate new buffers to accomodate the buffer size for example.

fn sync(
&mut self,
_: &Client,
_state: TransportState,
_pos: &TransportPosition
) -> bool

For slow-sync clients, called periodically when the transport position is changed. The transport will not start rolling until all clients indicate they are ready, or a timeout occurs.

It should return false until the handler is ready process audio.

Ignored unless Self::SLOW_SYNC == true.

Implementations on Foreign Types

impl ProcessHandler for ()

A trivial handler that does nothing.

fn process(&mut self, _: &Client, _: &ProcessScope) -> Control

Return Control::Continue so that the client stays activated.

Implementors

impl<F> ProcessHandler for ClosureProcessHandler<F>where
F: 'static + Send + FnMut(&Client, &ProcessScope) -> Control,