sdk/fidl/fuchsia.hardware.audio/composite.fidl

// Copyright 2023 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.hardware.audio;

using fuchsia.hardware.audio.signalprocessing;

@available(added=12)
type CompositeProperties = table {
    /// Driver type is input (true) or output (false)
    /// If not included, then the driver may be used for both input and output.
    ///
    /// Optional.
    //
    // # Deprecation
    //
    // Removed in favor of the signal processing topology describing the one or many
    // input and output pipelines that could not be expressed with this one field for
    // the whole driver. If the driver exposes only one input or output that is also
    // described by the signal processing topology.
    @available(deprecated=12, removed=13)
    1: is_input bool;

    /// UI string for the manufacturer name. If not set, the manufacturer is unknown.
    ///
    /// Optional.
    2: manufacturer string:MAX_UI_STRING_SIZE;

    /// UI string for the product name. If not set, the product name is unknown.
    ///
    /// Optional.
    3: product string:MAX_UI_STRING_SIZE;

    /// A unique identifier. If not included, there is no unique id for the Device.
    /// `unique_id` arrays starting with 0x42, 0x54, ... (or `BT` in ASCII) are
    /// reserved for drivers implementing Bluetooth technologies.
    /// `unique_id` arrays starting with 0x55, 0x53, 0x42, ... (or `USB` in ASCII) are
    /// reserved for drivers implementing USB technologies.
    /// Note that even though the above values map to readable ASCII characters, array
    /// values can span the entire uint8 range (0-255).
    ///
    /// Optional.
    4: unique_id array<uint8, UNIQUE_ID_SIZE>;

    /// An identifier for the clock domain in which this hardware operates. If
    /// two hardware devices have the same clock domain, their clock rates are
    /// identical and perfectly synchronized. Although these two clocks have the
    /// same rate, the clock positions may be offset from each other by an
    /// arbitrary (but fixed) amount. The clock_domain typically comes from a
    /// system wide entity, such as a platform bus or global clock tree.
    ///
    /// There are two special values:
    ///
    /// *  `CLOCK_DOMAIN_MONOTONIC` means the hardware is operating at the same
    ///    rate as the system montonic clock.
    ///
    /// *  `CLOCK_DOMAIN_EXTERNAL` means the hardware is operating at an unknown
    ///    rate and is not synchronized with any known clock, not even with
    ///    other clocks in domain `CLOCK_DOMAIN_EXTERNAL`.
    ///
    /// If the domain is not `CLOCK_DOMAIN_MONOTONIC`, client must use position
    /// notification updates to recover the hardware's clock.
    ///
    /// Required.
    5: clock_domain ClockDomain;
};

/// The `Composite` interface is a FIDL protocol exposed by audio drivers. The `Composite` interface
/// is generic and allows the configuration of various audio hardware types including those supported
/// by the `StreamConfig`, `Dai` and `Codec` FIDL interfaces. The `Composite` interface is more
/// generic and provides more flexible routing within audio subsystems. Also see
/// [Audio Driver Composite](https://fuchsia.dev/fuchsia-src/development/audio/drivers/composite.md)
@available(added=12)
closed protocol Composite {
    /// Allows providing driver health state.
    compose Health;

    /// Allows providing signal processing capabilities.
    compose fuchsia.hardware.audio.signalprocessing.Connector;

    /// Resets the hardware including all DAI interconnects and signal processing.
    /// As a result, all channels obtained by `CreateRingBuffer` will be closed.
    ///
    /// `Reset` returns when the hardware is fully reset. At this point, a client would need to
    /// reconfigure any DAI interconnects, select a signal processing topology and reconfigure
    /// any processing elements, and reconstruct any ring buffers.
    ///
    /// If the driver can't successfully reset the hardware, it will return an error and then close
    /// the protocol channel, in this case the client may obtain a new protocol channel and retry.
    strict Reset() -> () error DriverError;

    /// Retrieves top level static properties.
    strict GetProperties() -> (struct {
        properties CompositeProperties;
    });

    /// Retrieves the ring buffer formats supported by a `RING_BUFFER` `ENDPOINT` type processing
    /// element in the topology supported by this driver as returned by `GetElements` from
    /// fuchsia.hardware.audio.signalprocessing.
    /// Returns `SHOULD_WAIT` if the ring buffer formats are not available at the time, the
    /// client may retry at a later time.
    /// Returns `INVALID_ARGS` if the `processing_element_id` does not match an id returned
    /// by `GetElements`.
    /// Returns `WRONG_TYPE` if the `ElementType` of the element represented by the id is not
    /// `ENDPOINT` with `EndpointType` `RING_BUFFER`.
    /// Retrieving multiple `SupportedFormats` allows for cases where exclusive combinations of
    /// the parameters in `SupportedFormats` may be supported.
    strict GetRingBufferFormats(struct {
        processing_element_id uint64;
    }) -> (struct {
        ring_buffer_formats vector<SupportedFormats>:MAX_COUNT_FORMATS;
    }) error DriverError;

    /// `CreateRingBuffer` is sent by clients to select a ring buffer format for the
    /// `RING_BUFFER` `ENDPOINT` type processing element specified by `processing_element_id`.
    /// The format is based on information that the driver provides in `GetRingBufferFormats`,
    /// what is supported by the client, and any other requirement.
    /// The returned `ring_buffer` channel is used to access and control the audio buffer provided
    /// by the driver.
    /// Returns `INVALID_ARGS` if the `processing_element_id` does not match an id returned
    /// by `GetElements`.
    /// Returns `WRONG_TYPE` if the `ElementType` of the element represented by the id is not
    /// `ENDPOINT` with `EndpointType` `RING_BUFFER`.
    strict CreateRingBuffer(resource struct {
        processing_element_id uint64;
        format Format;
        ring_buffer server_end:RingBuffer;
    }) -> () error DriverError;

    /// Retrieves the DAI formats supported by a `DAI_INTERCONNECT` `ENDPOINT` type processing
    /// element in the topology supported by this driver as returned by `GetElements` from
    /// fuchsia.hardware.audio.signalprocessing.
    /// Returns `SHOULD_WAIT` if the DAI formats are not available at the time, the client
    /// may retry at a later time.
    /// Returns `INVALID_ARGS` if the `processing_element_id` does not match an id returned
    /// by `GetElements`.
    /// Returns `WRONG_TYPE` if the `ElementType` of the element represented by the id is not
    /// `ENDPOINT` with `EndpointType` `DAI_INTERCONNECT`.
    /// Retrieving multiple `DaiSupportedFormats` allows for cases where exclusive combinations of
    /// the parameters in SupportedFormats may be supported.
    strict GetDaiFormats(struct {
        processing_element_id uint64;
    }) -> (struct {
        dai_formats vector<DaiSupportedFormats>:MAX_COUNT_FORMATS;
    }) error DriverError;

    /// `SetDaiFormat` is sent by clients to select a DAI format for the `DAI_INTERCONNECT`
    /// `ENDPOINT` type processing element specified by `processing_element_id`.
    /// The format is based on information that the driver provides in `GetDaiFormats`, what is
    /// supported by the client, and any other requirement.
    /// Returns `INVALID_ARGS` if the `processing_element_id` does not match an id returned
    /// by `GetElements`.
    /// Returns `WRONG_TYPE` if the `ElementType` of the element represented by the id is not
    /// `ENDPOINT` with `EndpointType` `DAI_INTERCONNECT`.
    strict SetDaiFormat(struct {
        processing_element_id uint64;
        format DaiFormat;
    }) -> () error DriverError;
};

@available(added=12)
service DeviceService {
    device client_end:Composite;
};