Struct devices::virtio::snd::common_backend::stream_info::StreamInfo

pub struct StreamInfo {

    pub(crate) stream_source: Option<Box<dyn StreamSource>>,
    stream_source_generator: Arc<Box<dyn StreamSourceGenerator>>,
    pub(crate) channels: u8,
    pub(crate) format: SampleFormat,
    pub(crate) frame_rate: u32,
    buffer_bytes: usize,
    pub(crate) period_bytes: usize,
    direction: u8,
    pub state: u32,
    pub(crate) effects: Vec<StreamEffect>,
    pub just_reset: bool,
    pub status_mutex: Rc<RwLock<WorkerStatus>>,
    pub sender: Option<UnboundedSender<DescriptorChain>>,
    worker_future: Option<Box<dyn Future<Output = Result<(), Error>> + Unpin>>,
    release_signal: Option<Rc<(RwLock<bool>, Condvar)>>,
    card_index: usize,
    ex: Option<Executor>,
}

StreamInfo represents a virtio snd stream.

To create a StreamInfo, see StreamInfo::builder() and StreamInfoBuilder::build().

Fields

stream_source: Option<Box<dyn StreamSource>>

stream_source_generator: Arc<Box<dyn StreamSourceGenerator>>

channels: u8

format: SampleFormat

frame_rate: u32

buffer_bytes: usize

period_bytes: usize

direction: u8

state: u32

effects: Vec<StreamEffect>

just_reset: bool

status_mutex: Rc<RwLock<WorkerStatus>>

sender: Option<UnboundedSender<DescriptorChain>>

worker_future: Option<Box<dyn Future<Output = Result<(), Error>> + Unpin>>

release_signal: Option<Rc<(RwLock<bool>, Condvar)>>

card_index: usize

ex: Option<Executor>

Implementations

impl StreamInfo

async fn set_up_async_playback_stream( &mut self, frame_size: usize, ex: &Executor ) -> Result<Box<dyn AsyncPlaybackBufferStream>, Error>

(*) buffer_size in audio_streams API indicates the buffer size in bytes that the stream consumes (or transmits) each time (next_playback/capture_buffer). period_bytes in virtio-snd device (or ALSA) indicates the device transmits (or consumes) for each PCM message. Therefore, buffer_size in audio_streams == period_bytes in virtio-snd.

pub(crate) async fn set_up_async_capture_stream( &mut self, frame_size: usize, ex: &Executor ) -> Result<UnixBufferReader, Error>

pub(crate) async fn create_directionstream_output( &mut self, frame_size: usize, ex: &Executor ) -> Result<DirectionalStream, Error>

impl StreamInfo

pub fn builder( stream_source_generator: Arc<Box<dyn StreamSourceGenerator>>, card_index: usize ) -> StreamInfoBuilder

Creates a minimal StreamInfoBuilder. See StreamInfoBuilder::new() for the description of each parameter.

pub async fn set_params(&mut self, params: SetParams) -> Result<(), Error>

Sets parameters of the stream, putting it into VIRTIO_SND_R_PCM_SET_PARAMS state.

• params: SetParams for the pcm stream runtime configuration.

pub async fn prepare( &mut self, ex: &Executor, tx_send: &UnboundedSender<PcmResponse>, rx_send: &UnboundedSender<PcmResponse> ) -> Result<(), Error>

Prepares the stream, putting it into VIRTIO_SND_R_PCM_PREPARE state.

• ex: Executor to run the pcm worker.
• tx_send: Sender for sending PcmResponse for tx queue. (playback stream)
• rx_send: Sender for sending PcmResponse for rx queue. (capture stream)

pub async fn start(&mut self) -> Result<(), Error>

Starts the stream, putting it into VIRTIO_SND_R_PCM_START state.

pub async fn stop(&mut self) -> Result<(), Error>

Stops the stream, putting it into VIRTIO_SND_R_PCM_STOP state.

pub async fn release(&mut self) -> Result<(), Error>

Releases the stream, putting it into VIRTIO_SND_R_PCM_RELEASE state.

async fn release_worker(&mut self)

pub fn snapshot(&self) -> StreamInfoSnapshot

pub fn restore(&mut self, state: &StreamInfoSnapshot)

Trait Implementations

impl Debug for StreamInfo

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

Formats the value using the given formatter.

impl Drop for StreamInfo

fn drop(&mut self)

Executes the destructor for this type.

impl From<StreamInfoBuilder> for StreamInfo

fn from(builder: StreamInfoBuilder) -> Self

Converts to this type from the input type.