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;

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

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

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