Struct AlsaBackend 

pub struct AlsaBackend { /* private fields */ }

ALSA host backend with provider-supplied deterministic PCM devices.

Implementations

impl AlsaBackend

pub fn new(devices: Vec<AlsaPcmDevice>) -> Self

Builds a hardware-required backend over the supplied PCM devices.

Capabilities are derived from the devices’ directions; the backend reports that real audio hardware is required.

pub fn fake() -> Self

Builds an offline backend with a deterministic set of fake PCM devices.

The backend reports that hardware is not required and carries the Offline and Fake capabilities, so it can drive validation without an ALSA development package or sound hardware. It exposes a default playback, a default capture, a hw:0,0 playback, and a plughw:1,0 capture device.

Examples

use sim_lib_stream_alsa::AlsaBackend;

let backend = AlsaBackend::fake();
assert_eq!(backend.list_devices().len(), 4);
assert!(backend.default_playback().is_some());
assert!(backend.default_capture().is_some());

pub fn list_devices(&self) -> &[AlsaPcmDevice]

Returns the backend’s PCM devices in registration order.

pub fn default_playback(&self) -> Option<&AlsaPcmDevice>

Returns the first default device that can serve output, if any.

pub fn default_capture(&self) -> Option<&AlsaPcmDevice>

Returns the first default device that can serve input, if any.

pub fn open_default_playback(&self, capacity: usize) -> Result<HostOpenStream>

Opens an output stream on the default playback device.

Errors when no default playback device is present, or when the open request cannot be satisfied. capacity bounds the stream buffer.

pub fn open_default_capture(&self, capacity: usize) -> Result<HostOpenStream>

Opens an input stream on the default capture device.

Errors when no default capture device is present, or when the open request cannot be satisfied. capacity bounds the stream buffer.

Trait Implementations

impl Clone for AlsaBackend

fn clone(&self) -> AlsaBackend

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AlsaBackend

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

Formats the value using the given formatter.

impl Default for AlsaBackend

fn default() -> Self

Returns the “default value” for a type.

impl HostBackend for AlsaBackend

fn info(&self) -> &HostBackendInfo

Stable backend metadata.

fn enumerate(&self) -> Result<HostDeviceInventory>

Enumerates available devices and ports without opening hardware streams.

fn open(&self, request: HostStreamConfigRequest) -> Result<HostOpenStream>

Opens a stream according to the requested host configuration.