Struct devices::virtio::snd::vios_backend::VioSClient

pub struct VioSClient {

    config: VioSConfig,
    jacks: Vec<virtio_snd_jack_info>,
    streams: Vec<virtio_snd_pcm_info>,
    chmaps: Vec<virtio_snd_chmap_info>,
    control_socket: Mutex<UnixSeqpacket>,
    event_socket: UnixSeqpacket,
    tx: IoBufferQueue,
    rx: IoBufferQueue,
    events: Arc<Mutex<VecDeque<virtio_snd_event>>>,
    event_notifier: Event,
    tx_subscribers: Arc<Mutex<HashMap<usize, Sender<BufferReleaseMsg>>>>,
    rx_subscribers: Arc<Mutex<HashMap<usize, Sender<BufferReleaseMsg>>>>,
    recv_thread_state: Arc<Mutex<ThreadFlags>>,
    recv_thread: Mutex<Option<WorkerThread<Result<(), Error>>>>,
    params: HashMap<u32, virtio_snd_pcm_set_params>,
}

The client for the VioS backend

Uses a protocol equivalent to virtio-snd over a shared memory file and a unix socket for notifications. It’s thread safe, it can be encapsulated in an Arc smart pointer and shared between threads.

Fields

config: VioSConfig

jacks: Vec<virtio_snd_jack_info>

streams: Vec<virtio_snd_pcm_info>

chmaps: Vec<virtio_snd_chmap_info>

control_socket: Mutex<UnixSeqpacket>

event_socket: UnixSeqpacket

tx: IoBufferQueue

rx: IoBufferQueue

events: Arc<Mutex<VecDeque<virtio_snd_event>>>

event_notifier: Event

tx_subscribers: Arc<Mutex<HashMap<usize, Sender<BufferReleaseMsg>>>>

rx_subscribers: Arc<Mutex<HashMap<usize, Sender<BufferReleaseMsg>>>>

recv_thread_state: Arc<Mutex<ThreadFlags>>

recv_thread: Mutex<Option<WorkerThread<Result<(), Error>>>>

params: HashMap<u32, virtio_snd_pcm_set_params>

Implementations

impl VioSClient

pub fn try_new<P: AsRef<Path>>(server: P) -> Result<VioSClient, Error>

Create a new client given the path to the audio server’s socket.

pub fn num_jacks(&self) -> u32

Get the number of jacks

pub fn num_streams(&self) -> u32

Get the number of pcm streams

pub fn num_chmaps(&self) -> u32

Get the number of channel maps

pub fn jack_info(&self, idx: u32) -> Option<virtio_snd_jack_info>

Get the configuration information on a jack

pub fn stream_info(&self, idx: u32) -> Option<virtio_snd_pcm_info>

Get the configuration information on a pcm stream

pub fn chmap_info(&self, idx: u32) -> Option<virtio_snd_chmap_info>

Get the configuration information on a channel map

pub fn start_bg_thread(&self) -> Result<(), Error>

Starts the background thread that receives release messages from the server. If the thread was already started this function does nothing. This thread must be started prior to attempting any stream IO operation or the calling thread would block.

pub fn stop_bg_thread(&self) -> Result<(), Error>

Stops the background thread.

pub fn get_event_notifier(&self) -> Result<Event, Error>

Gets an Event object that will trigger every time an event is received from the server

pub fn pop_event(&self) -> Option<virtio_snd_event>

Retrieves one event. Callers should have received a notification through the event notifier before calling this function.

pub fn remap_jack( &self, jack_id: u32, association: u32, sequence: u32 ) -> Result<(), Error>

Remap a jack. This should only be called if the jack announces support for the operation through the features field in the corresponding virtio_snd_jack_info struct.

pub fn set_stream_parameters( &mut self, stream_id: u32, params: VioSStreamParams ) -> Result<(), Error>

Configures a stream with the given parameters.

pub fn set_stream_parameters_raw( &mut self, raw_params: virtio_snd_pcm_set_params ) -> Result<(), Error>

Configures a stream with the given parameters.

pub fn prepare_stream(&self, stream_id: u32) -> Result<(), Error>

Send the PREPARE_STREAM command to the server.

pub fn release_stream(&self, stream_id: u32) -> Result<(), Error>

Send the RELEASE_STREAM command to the server.

pub fn start_stream(&self, stream_id: u32) -> Result<(), Error>

Send the START_STREAM command to the server.

pub fn stop_stream(&self, stream_id: u32) -> Result<(), Error>

Send the STOP_STREAM command to the server.

pub fn inject_audio_data<R, Cb: FnOnce(VolatileSlice<'_>) -> R>( &self, stream_id: u32, size: usize, callback: Cb ) -> Result<(u32, R), Error>

Send audio frames to the server. Blocks the calling thread until the server acknowledges the data.

pub fn request_audio_data<R, Cb: FnOnce(&VolatileSlice<'_>) -> R>( &self, stream_id: u32, size: usize, callback: Cb ) -> Result<(u32, R), Error>

Request audio frames from the server. It blocks until the data is available.

pub fn keep_rds(&self) -> Vec<RawDescriptor>

Get a list of file descriptors used by the implementation.

fn common_stream_op(&self, stream_id: u32, op: u32) -> Result<(), Error>

fn request_and_cache_info(&mut self) -> Result<(), Error>

fn request_info<T: AsBytes + FromBytes + Default + Copy + Clone>( &self, req_code: u32, count: usize ) -> Result<Vec<T>, Error>

fn request_and_cache_jacks_info(&mut self) -> Result<(), Error>

fn request_and_cache_streams_info(&mut self) -> Result<(), Error>

fn request_and_cache_chmaps_info(&mut self) -> Result<(), Error>

pub fn snapshot(&self) -> VioSClientSnapshot

pub fn restore(&mut self, data: VioSClientSnapshot) -> Result<()>

pub fn restore_stream( &mut self, stream_id: u32, state: StreamState ) -> Result<(), Error>