sdk/fidl/fuchsia.hardware.midi/midi.fidl

// Copyright 2019 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.midi;

using zx;

/// Describes what type of MIDI device an implementation of Device represents
type Info = struct {
    /// Whether or not this device is a MIDI sink
    is_sink bool;
    /// Whether or not this device is a MIDI source
    is_source bool;
};

const READ_SIZE uint32 = 3;

closed protocol Device {
    /// Get information about the type of MIDI device
    strict GetInfo() -> (struct {
        info Info;
    });

    /// Reads data from the midi device. Only applicable if GetInfo returns
    /// is_source.
    strict Read() -> (struct {
        event vector<uint8>:READ_SIZE;
    }) error zx.Status;

    /// Writes data to the midi device. Only applicable if GetInfo returns
    /// is_sink.
    strict Write(struct {
        data vector<uint8>:MAX;
    }) -> () error zx.Status;
};

closed protocol Controller {
    /// Opens a new session on the device.
    ///
    /// At most one session is permitted at one time; the server end will be
    /// closed with `ZX_ERR_ALREADY_BOUND` if a session already exists.
    strict OpenSession(resource struct {
        session server_end:Device;
    });
};