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// Copyright (c) 2012 The Chromium 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 "content/browser/device_monitor_mac.h"
#include <IOKit/audio/IOAudioDefines.h>
#include <IOKit/usb/IOUSBLib.h>
#include "base/logging.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_ioobject.h"
namespace content {
namespace {
const io_name_t kServices[] = {
kIOFirstPublishNotification,
kIOTerminatedNotification,
};
CFMutableDictionaryRef CreateMatchingDictionaryForUSBDevices(
SInt32 interface_class_code, SInt32 interface_subclass_code) {
CFMutableDictionaryRef matching_dictionary =
IOServiceMatching(kIOUSBInterfaceClassName);
base::mac::ScopedCFTypeRef<CFNumberRef> number_ref(CFNumberCreate(
kCFAllocatorDefault, kCFNumberSInt32Type, &interface_class_code));
DCHECK(number_ref);
CFDictionaryAddValue(matching_dictionary, CFSTR(kUSBInterfaceClass),
number_ref);
number_ref.reset(CFNumberCreate(kCFAllocatorDefault,
kCFNumberSInt32Type,
&interface_subclass_code));
DCHECK(number_ref);
CFDictionaryAddValue(matching_dictionary, CFSTR(kUSBInterfaceSubClass),
number_ref);
return matching_dictionary;
}
void RegisterCallbackToIOService(IONotificationPortRef port,
const io_name_t type,
CFMutableDictionaryRef dictionary,
IOServiceMatchingCallback callback,
void* context,
io_iterator_t* service) {
kern_return_t err = IOServiceAddMatchingNotification(port,
type,
dictionary,
callback,
context,
service);
if (err) {
NOTREACHED() << "Failed to register the IO matched notification for type "
<< type;
return;
}
DCHECK(*service);
// Iterate over set of matching devices to access already-present devices
// and to arm the notification.
for (base::mac::ScopedIOObject<io_service_t> object(IOIteratorNext(*service));
object;
object.reset(IOIteratorNext(*service))) {};
}
} // namespace
DeviceMonitorMac::DeviceMonitorMac() {
// Add the notification port to the run loop.
notification_port_ = IONotificationPortCreate(kIOMasterPortDefault);
DCHECK(notification_port_);
RegisterAudioServices();
RegisterVideoServices();
CFRunLoopAddSource(CFRunLoopGetCurrent(),
IONotificationPortGetRunLoopSource(notification_port_),
kCFRunLoopCommonModes);
}
DeviceMonitorMac::~DeviceMonitorMac() {
// Stop the notifications and free the objects.
for (size_t i = 0; i < notification_iterators_.size(); ++i) {
IOObjectRelease(*notification_iterators_[i]);
}
notification_iterators_.clear();
// Remove the notification port from the message runloop.
CFRunLoopRemoveSource(CFRunLoopGetCurrent(),
IONotificationPortGetRunLoopSource(notification_port_),
kCFRunLoopCommonModes);
// Destroy the notification port allocated by IONotificationPortCreate.
IONotificationPortDestroy(notification_port_);
}
void DeviceMonitorMac::RegisterAudioServices() {
CFMutableDictionaryRef dictionary =
IOServiceMatching(kIOAudioDeviceClassName);
RegisterServices(dictionary, &AudioDeviceCallback);
}
void DeviceMonitorMac::RegisterVideoServices() {
CFMutableDictionaryRef dictionary = CreateMatchingDictionaryForUSBDevices(
kUSBVideoInterfaceClass, kUSBVideoControlSubClass);
RegisterServices(dictionary, &VideoDeviceCallback);
}
void DeviceMonitorMac::RegisterServices(CFMutableDictionaryRef dictionary,
IOServiceMatchingCallback callback) {
// Add callback to the service.
for (size_t i = 0; i < arraysize(kServices); ++i) {
// |dictionary| comes in with a reference count as 1. Since each call to
// IOServiceAddMatchingNotification consumes one reference, we need to
// retain |arraysize(kServices) -1| additional dictionary references.
if (i < (arraysize(kServices) - 1))
CFRetain(dictionary);
// Register callback to each service.
io_iterator_t service;
RegisterCallbackToIOService(notification_port_,
kServices[i],
dictionary,
callback,
this,
&service);
// Store the pointer of the object to release the memory when shutting
// down the services.
notification_iterators_.push_back(&service);
}
}
void DeviceMonitorMac::AudioDeviceCallback(void *context,
io_iterator_t iterator) {
for (base::mac::ScopedIOObject<io_service_t> object(IOIteratorNext(iterator));
object;
object.reset(IOIteratorNext(iterator))) {
if (context) {
reinterpret_cast<DeviceMonitorMac*>(context)->NotifyDeviceChanged(
base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE);
}
}
}
void DeviceMonitorMac::VideoDeviceCallback(void *context,
io_iterator_t iterator) {
for (base::mac::ScopedIOObject<io_service_t> object(IOIteratorNext(iterator));
object;
object.reset(IOIteratorNext(iterator))) {
if (context) {
reinterpret_cast<DeviceMonitorMac*>(context)->NotifyDeviceChanged(
base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE);
}
}
}
void DeviceMonitorMac::NotifyDeviceChanged(
base::SystemMonitor::DeviceType type) {
// TODO(xians): Remove the global variable for SystemMonitor.
base::SystemMonitor::Get()->ProcessDevicesChanged(type);
}
} // namespace content
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