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// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <alsa/asoundlib.h>
#include <map>
#include <memory>
#include <vector>
#include <base/files/scoped_file.h>
#include <base/observer_list.h>
#include <base/observer_list_types.h>
#include <gtest/gtest_prod.h>
#include "midis/device.h"
#include "midis/seq_handler.h"
#include "mojo/midis.mojom.h"
namespace midis {
class SeqHandler;
class DeviceTracker {
void AddDevice(std::unique_ptr<Device> dev);
void RemoveDevice(uint32_t sys_num, uint32_t dev_num);
bool InitDeviceTracker();
void ListDevices(std::vector<arc::mojom::MidisDeviceInfoPtr>* list);
class Observer : public base::CheckedObserver {
virtual ~Observer() {}
// Function which is executed when a MIDI device is added or removed
// from the h/w. The client registered as an observer can expect
// that struct MidisDeviceInfo pointer is allocated and its fields have
// been filled out correctly.
// The 'added' argument is set to true if the device was added, and false
// otherwise.
virtual void OnDeviceAddedOrRemoved(const Device& dev, bool added) = 0;
void AddDeviceObserver(Observer* obs);
void RemoveDeviceObserver(Observer* obs);
base::ScopedFD AddClientToReadSubdevice(uint32_t sys_num,
uint32_t device_num,
uint32_t subdevice_num,
uint32_t client_id);
// Remove the client from all watchers for the element of |device_| which
// matches is identified by |sys_num| and |device_num|. This is useful when a
// client wants to close requested ports for a device, but may choose to
// re-request them later on.
void RemoveClientFromDevice(uint32_t client_id,
uint32_t sys_num,
uint32_t device_num);
// Remove the client from all devices in |devices_|. This function is intended
// to be used when we detect the removal of an entire client either through
// orderly or disorderly shutdown.
void RemoveClientFromDevices(uint32_t client_id);
static uint32_t GenerateDeviceId(uint32_t sys_num, uint32_t device_num) {
return (sys_num << 8) | device_num;
void HandleReceiveData(uint32_t card_id,
uint32_t device_id,
uint32_t port_id,
const char* buffer,
size_t buf_len);
// Utility function to ascertain whether a device is already registered.
bool IsDevicePresent(uint32_t card_id, uint32_t device_id);
// Utility function to ascertain whether a port is already registered.
bool IsPortPresent(uint32_t card_id, uint32_t device_id, uint32_t port_id);
// Private helper to retrieve a Device pointer if it exists.
Device* FindDevice(uint32_t card_id, uint32_t device_id) const;
friend class DeviceTrackerTest;
FRIEND_TEST(DeviceTrackerTest, Add2DevicesPositive);
FRIEND_TEST(DeviceTrackerTest, AddRemoveDevicePositive);
FRIEND_TEST(DeviceTrackerTest, AddDeviceRemoveNegative);
void NotifyObserversDeviceAddedOrRemoved(const Device& dev, bool added);
std::map<uint32_t, std::unique_ptr<Device>> devices_;
std::unique_ptr<SeqHandler> seq_handler_;
base::ObserverList<Observer> observer_list_;
} // namespace midis