Struct fidl_fuchsia_audio_device::ControlSynchronousProxy

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pub struct ControlSynchronousProxy { /* private fields */ }

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pub fn wait_for_event(&self, deadline: Time) -> Result<ControlEvent, Error>

Waits until an event arrives and returns it. It is safe for other threads to make concurrent requests while waiting for an event.

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pub fn get_elements( &self, ___deadline: Time ) -> Result<ReaderGetElementsResult, Error>

Returns a vector of supported processing elements. Must return one or more processing elements, or ZX_ERR_NOT_SUPPORTED.

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pub fn watch_element_state( &self, processing_element_id: u64, ___deadline: Time ) -> Result<ElementState, Error>

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

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pub fn get_topologies( &self, ___deadline: Time ) -> Result<ReaderGetTopologiesResult, Error>

Returns a vector of supported topologies. Must return one or more topologies, or ZX_ERR_NOT_SUPPORTED. If more than one topology is returned, then the client may choose any of the topologies from the list with SetTopology. If only one topology is returned, then the topology definition is informational only since the one and only topology used can’t be changed with SetTopology. If GetElements returns one or more elements, GetTopologies must return one or more topologies.

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pub fn watch_topology(&self, ___deadline: Time) -> Result<u64, Error>

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, which 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.

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pub fn set_element_state( &self, processing_element_id: u64, state: &ElementState, ___deadline: Time ) -> Result<SignalProcessingSetElementStateResult, Error>

Controls a processing element using a unique id returned by GetElements. Returns ZX_ERR_INVALID_ARGS if the processing_element_id does not match an id returned by GetElements or the type of TypeSpecificElementState does not match the ElementType of the processing element returned by GetElements for this id. The driver may return ZX_ERR_INVALID_ARGS if the state values are invalid, i.e. any of the values violates rules specified in this protocol, e.g. trying to change an EQUALIZER processing element’s EqualizerBandState frequency when this processing element did not advertise CAN_CONTROL_FREQUENCY in its supported_controls.

SetElementState may be called before or after non-SignalProcessing protocol calls. If called after non-SignalProcessing protocol calls then SetElementState may or may not require renegotiation of the driver state as reached with calls of the protocol composing SignalProcessing, e.g. Dai. For instance, SetElementState changing an AGL processing element’s parameters may not require renegotiation of the Dai state because changing a gain parameter usually does not change the set of supported audio formats. By contrast, if SetElementState changes the parameters of a CONNECTION_POINT element, the change may require renegotiation because it may invalidate the set of supported formats returned in a previous GetDaiFormats Dai protocol call.

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

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pub fn set_topology( &self, topology_id: u64, ___deadline: Time ) -> Result<SignalProcessingSetTopologyResult, Error>

Sets the topology to be used using an id to the vector returned by GetTopologies. The current topology is communicated by WatchTopology responses. To change which topology is active, a client uses SetTopology. If the specified topology_id is not within thetopologies returned by GetTopologies, this call will return ZX_ERR_INVALID_ARGS. If GetTopologies returns only one Topology, SetTopology is optional and has no effect.

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.

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pub fn set_gain( &self, payload: &ControlSetGainRequest, ___deadline: Time ) -> Result<ControlSetGainResult, Error>

Change the device’s overall gain state.

Should only be called for StreamConfig devices.

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pub fn create_ring_buffer( &self, payload: ControlCreateRingBufferRequest, ___deadline: Time ) -> Result<ControlCreateRingBufferResult, Error>

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 and StreamConfig devices.

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pub fn set_dai_format( &self, payload: &ControlSetDaiFormatRequest, ___deadline: Time ) -> Result<ControlSetDaiFormatResult, Error>

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.

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pub fn codec_start( &self, ___deadline: Time ) -> Result<ControlCodecStartResult, Error>

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.

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pub fn codec_stop( &self, ___deadline: Time ) -> Result<ControlCodecStopResult, Error>

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.

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pub fn reset(&self, ___deadline: Time) -> Result<ControlResetResult, Error>

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.