Struct ControlProxy 

pub struct ControlProxy { /* private fields */ }

Implementations

impl ControlProxy

pub fn new(channel: AsyncChannel) -> Self

Create a new Proxy for fuchsia.audio.device/Control.

pub fn take_event_stream(&self) -> ControlEventStream

Get a Stream of events from the remote end of the protocol.

Panics

Panics if the event stream was already taken.

pub fn get_elements( &self, ) -> QueryResponseFut<ReaderGetElementsResult, DefaultFuchsiaResourceDialect>

Returns a vector of supported processing elements. This vector must include one or more processing elements.

pub fn watch_element_state( &self, processing_element_id: u64, ) -> QueryResponseFut<ElementState, DefaultFuchsiaResourceDialect>

Get the processing element state via a hanging get. For a given processing_element_id, the driver will immediately reply to the first WatchElementState sent by the client. The driver will not respond to subsequent client WatchElementState calls for that processing_element_id until any portion of the ElementState has changed from what was most recently reported for that element.

The driver will close the protocol channel with an error of ZX_ERR_INVALID_ARGS, if processing_element_id does not match an ElementId returned by GetElements.

The driver will close the protocol channel with an error of ZX_ERR_BAD_STATE, if this method is called again while there is already a pending WatchElementState for this client and processing_element_id.

pub fn get_topologies( &self, ) -> QueryResponseFut<ReaderGetTopologiesResult, DefaultFuchsiaResourceDialect>

Returns a vector of supported topologies. This vector must include one or more topologies. If more than one topology is returned, then the client may select any topology from the list by calling SetTopology. If only one topology is returned, SetTopology can still be called but causes no change.

Each Element must be included in at least one Topology, but need not be included in every Topology.

pub fn watch_topology( &self, ) -> QueryResponseFut<u64, DefaultFuchsiaResourceDialect>

Get the current topology via a hanging get. The driver will immediately reply to the first WatchTopology sent by each client. The driver will not respond to subsequent WatchTopology calls from that client until the signal processing topology changes; this occurs as a result of a SetTopology call.

The driver will close the protocol channel with an error of ZX_ERR_BAD_STATE, if this method is called again while there is already a pending WatchTopology for this client.

pub fn set_topology( &self, topology_id: u64, ) -> QueryResponseFut<SignalProcessingSetTopologyResult, DefaultFuchsiaResourceDialect>

Sets the currently active topology by specifying a topology_id, which matches to an entry in the vector returned by GetTopologies. The currently active topology is communicated by WatchTopology responses. To change which topology is active, a client uses SetTopology.

If GetTopologies returns only one Topology, SetTopology is optional and has no effect.

This call will fail and return ZX_ERR_INVALID_ARGS if the specified topology_id is not found within thetopologies returned by GetTopologies.

SetTopology may be called before or after non-SignalProcessing protocol calls. If called after non-SignalProcessing protocol calls, then SetTopology may return ZX_ERR_BAD_STATE to indicate that the operation can not proceed without renegotiation of the driver state. See SetElementState for further discussion.

pub fn set_element_state( &self, processing_element_id: u64, state: &SettableElementState, ) -> QueryResponseFut<SignalProcessingSetElementStateResult, DefaultFuchsiaResourceDialect>

Controls the processing element specified by processing_element_id, a unique ElementId returned by GetElements. The state specified in calls to SetElementState is a SettableElementState. This is a subset of ElementState because some fields returned by WatchElementState (e.g. latency or plug_state) can only be observed (not set) by the client.

Returns ZX_ERR_INVALID_ARGS if processing_element_id does not match a known ElementId returned by GetElements, or if state is not valid for the element. This entails any violation of the rules specified in this protocol.

Examples: state specifies that an element should be stopped or bypassed, but the corresponding element does not specify (or explicitly set to false) can_stop or can_bypass. state includes a type_specific entry, but that SettableTypeSpecificElementState does not match the ElementType of the element corresponding to processing_element_id. state changes an EqualizerBandState for an EQUALIZER element (so far so good), but specifies a change to frequency when this element did not set CAN_CONTROL_FREQUENCY in its supported_controls. state specifies a GainElementState for a GAIN element with a gain value that is -infinity, NAN, or outside the Element’s stated [min_gain, max_gain] range.

Callers may intersperse method calls to the SignalProcessing protocol with calls to other driver protocols. Some non-SignalProcessing configuration changes may require a renegotiation of the driver state before certain elements can receive a SetElementState. For example, if a DaiFormat is changed, then SetElementState changing an AGL element’s parameters may not require renegotiation of driver state because changing gain parameters usually does not change the set of supported audio formats. By contrast, following the same DaiFormat change, before SetElementState can be called on a CONNECTION_POINT element, the driver state may need to be reestablished because the format change may invalidate the set of supported formats returned in a previous GetDaiFormats protocol call for another part of the Topology.

It is the driver’s job to determine when renegotiation is required. When this is needed, the related SetElementState call must return ZX_ERR_BAD_STATE and the client must close the protocol channel entirely, such that the protocol negotiations are started over. The client then must re-invoke the SetElementState call that returned ZX_ERR_BAD_STATE before any non-SignalProcessing protocol calls.

pub fn create_ring_buffer( &self, payload: ControlCreateRingBufferRequest, ) -> QueryResponseFut<ControlCreateRingBufferResult, DefaultFuchsiaResourceDialect>

Create the ring buffer used to pass audio to/from this device. If the device is Composite, then the targeted RING_BUFFER ENDPOINT must be identified by element_id.

Should only be called for Composite devices.

pub fn set_dai_format( &self, payload: &ControlSetDaiFormatRequest, ) -> QueryResponseFut<ControlSetDaiFormatResult, DefaultFuchsiaResourceDialect>

Set the wire format for the digital interconnect connected to this Codec endpoint. This method returns information related to the format that was set, including delay values. If the device is Composite, then the targeted DAI_INTERCONNECT ENDPOINT must be identified by element_id.

Should only be called for Codec and Composite devices.

pub fn codec_start( &self, ) -> QueryResponseFut<ControlCodecStartResult, DefaultFuchsiaResourceDialect>

Start the Codec hardware. If successful, this returns after the Codec was started and start_time indicates the time when the hardware started. Note that the Codec’s DaiFormat must be set (by a successful SetDaiFormat call) before calling this method.

Should only be called for Codec devices.

pub fn codec_stop( &self, ) -> QueryResponseFut<ControlCodecStopResult, DefaultFuchsiaResourceDialect>

Stop the Codec hardware. If successful, this returns after the Codec was stopped and stop_time indicates the time when the hardware stopped. Note that the Codec’s DaiFormat must be set (by a successful SetDaiFormat call) before calling this method.

Should only be called for Codec devices.

pub fn reset( &self, ) -> QueryResponseFut<ControlResetResult, DefaultFuchsiaResourceDialect>

Reset the hardware – stopping the hardware, releasing any ring buffers, and clearing any DaiFormats or RingBufferFormats that were set.

This method returns when the hardware reset is complete. After calling this method, the device is still controlled, but any ring buffers must be re-created and re-started. For devices with DAI_INTERCONNECTs (such as Codecs and some Composites), SetDaiFormat and CodecStart must be called again (in that order) to return the interconnect to the active operational mode. As applicable, SetTopology and SetElementState must also be called.

Should only be called for Codec and Composite devices.

Trait Implementations

impl Clone for ControlProxy

fn clone(&self) -> ControlProxy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl ControlProxyInterface for ControlProxy

type GetElementsResponseFut = QueryResponseFut<Result<Vec<Element>, i32>>

type WatchElementStateResponseFut = QueryResponseFut<ElementState>

type GetTopologiesResponseFut = QueryResponseFut<Result<Vec<Topology>, i32>>

type WatchTopologyResponseFut = QueryResponseFut<u64>

type SetTopologyResponseFut = QueryResponseFut<Result<(), i32>>

type SetElementStateResponseFut = QueryResponseFut<Result<(), i32>>

type CreateRingBufferResponseFut = QueryResponseFut<Result<ControlCreateRingBufferResponse, ControlCreateRingBufferError>>

type SetDaiFormatResponseFut = QueryResponseFut<Result<ControlSetDaiFormatResponse, ControlSetDaiFormatError>>

type CodecStartResponseFut = QueryResponseFut<Result<ControlCodecStartResponse, ControlCodecStartError>>

type CodecStopResponseFut = QueryResponseFut<Result<ControlCodecStopResponse, ControlCodecStopError>>

type ResetResponseFut = QueryResponseFut<Result<ControlResetResponse, ControlResetError>>

fn get_elements(&self) -> Self::GetElementsResponseFut

fn watch_element_state( &self, processing_element_id: u64, ) -> Self::WatchElementStateResponseFut

fn get_topologies(&self) -> Self::GetTopologiesResponseFut

fn watch_topology(&self) -> Self::WatchTopologyResponseFut

fn set_topology(&self, topology_id: u64) -> Self::SetTopologyResponseFut

fn set_element_state( &self, processing_element_id: u64, state: &SettableElementState, ) -> Self::SetElementStateResponseFut

fn create_ring_buffer( &self, payload: ControlCreateRingBufferRequest, ) -> Self::CreateRingBufferResponseFut

fn set_dai_format( &self, payload: &ControlSetDaiFormatRequest, ) -> Self::SetDaiFormatResponseFut

fn codec_start(&self) -> Self::CodecStartResponseFut

fn codec_stop(&self) -> Self::CodecStopResponseFut

fn reset(&self) -> Self::ResetResponseFut

impl Debug for ControlProxy

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

Formats the value using the given formatter.

impl Proxy for ControlProxy

type Protocol = ControlMarker

The protocol which this Proxy controls.

fn from_channel(inner: AsyncChannel) -> Self

Create a proxy over the given channel.

fn into_channel(self) -> Result<AsyncChannel, Self>

Attempt to convert the proxy back into a channel.

fn as_channel(&self) -> &AsyncChannel

Get a reference to the proxy’s underlying channel.

fn into_client_end(self) -> Result<ClientEnd<Self::Protocol>, Self>

Attempt to convert the proxy back into a client end.

fn is_closed(&self) -> bool

Returns true if the proxy has received the PEER_CLOSED signal.

fn on_closed(&self) -> OnSignals<'_, Unowned<'_, Handle>>

Returns a future that completes when the proxy receives the PEER_CLOSED signal.