appleremote.m

VLC Player Source Code

        if (simulatePlusMinusHold) {
            if (event == kRemoteButtonVolume_Plus || event == kRemoteButtonVolume_Minus) {
                if (pressedDown) {
                    lastPlusMinusEvent = event;
                    lastPlusMinusEventTime = [NSDate timeIntervalSinceReferenceDate];
                    [self performSelector:@selector(sendSimulatedPlusMinusEvent:)
                               withObject:[NSNumber numberWithDouble:lastPlusMinusEventTime]
                               afterDelay:HOLD_RECOGNITION_TIME_INTERVAL];
                    return;
                } else {
                    if (lastEventSimulatedHold) {
                        event = (event==kRemoteButtonVolume_Plus) ? kRemoteButtonVolume_Plus_Hold : kRemoteButtonVolume_Minus_Hold;
                        lastPlusMinusEvent = 0;
                        lastEventSimulatedHold = NO;
                    } else {
                        @synchronized(self) {
                            lastPlusMinusEvent = 0;
                        }
                        pressedDown = YES;
                    }
                }
            }
        }

        if (([self clickCountEnabledButtons] & event) == event) {
            if (pressedDown==NO && (event == kRemoteButtonVolume_Minus || event == kRemoteButtonVolume_Plus)) {
                return; // this one is triggered automatically by the handler
            }
            NSNumber* eventNumber;
            NSNumber* timeNumber;
            @synchronized(self) {
                lastClickCountEventTime = [NSDate timeIntervalSinceReferenceDate];
                if (lastClickCountEvent == event) {
                    eventClickCount = eventClickCount + 1;
                } else {
                    eventClickCount = 1;
                }
                lastClickCountEvent = event;
                timeNumber = [NSNumber numberWithDouble:lastClickCountEventTime];
                eventNumber= [NSNumber numberWithUnsignedInt:event];
            }
            [self performSelector: @selector(executeClickCountEvent:)
                       withObject: [NSArray arrayWithObjects:eventNumber, timeNumber, nil]
                       afterDelay: maxClickTimeDifference];
        } else {
            [delegate appleRemoteButton:event pressedDown: pressedDown clickCount:1];
        }
    }
}

- (void) executeClickCountEvent: (NSArray*) values {
    AppleRemoteEventIdentifier event = [[values objectAtIndex: 0] unsignedIntValue];
    NSTimeInterval eventTimePoint = [[values objectAtIndex: 1] doubleValue];

    BOOL finishedClicking = NO;
    int finalClickCount = eventClickCount;

    @synchronized(self) {
        finishedClicking = (event != lastClickCountEvent || eventTimePoint == lastClickCountEventTime);
        if (finishedClicking) eventClickCount = 0;
    }

    if (finishedClicking) {
        [delegate appleRemoteButton:event pressedDown: YES clickCount:finalClickCount];
        if ([self simulatesPlusMinusHold]==NO && (event == kRemoteButtonVolume_Minus || event == kRemoteButtonVolume_Plus)) {
            // trigger a button release event, too
            [NSThread sleepUntilDate: [NSDate dateWithTimeIntervalSinceNow:0.1]];
            [delegate appleRemoteButton:event pressedDown: NO clickCount:finalClickCount];
        }
    }

}

- (void) handleEventWithCookieString: (NSString*) cookieString sumOfValues: (SInt32) sumOfValues {
    /*
    if (previousRemainingCookieString) {
        cookieString = [previousRemainingCookieString stringByAppendingString: cookieString];
        NSLog(@"New cookie string is %@", cookieString);
        [previousRemainingCookieString release], previousRemainingCookieString=nil;
    }*/
    if (cookieString == nil || [cookieString length] == 0) return;
    NSNumber* buttonId = [[self cookieToButtonMapping] objectForKey: cookieString];
    if (buttonId != nil) {
        [self sendRemoteButtonEvent: [buttonId intValue] pressedDown: (sumOfValues>0)];
    } else {
        // let's see if a number of events are stored in the cookie string. this does
        // happen when the main thread is too busy to handle all incoming events in time.
        NSString* subCookieString;
        NSString* lastSubCookieString=nil;
        while(subCookieString = [self validCookieSubstring: cookieString]) {
            cookieString = [cookieString substringFromIndex: [subCookieString length]];
            lastSubCookieString = subCookieString;
            if (processesBacklog) [self handleEventWithCookieString: subCookieString sumOfValues:sumOfValues];
        }
        if (processesBacklog == NO && lastSubCookieString != nil) {
            // process the last event of the backlog and assume that the button is not pressed down any longer.
            // The events in the backlog do not seem to be in order and therefore (in rare cases) the last event might be
            // a button pressed down event while in reality the user has released it.
            // NSLog(@"processing last event of backlog");
            [self handleEventWithCookieString: lastSubCookieString sumOfValues:0];
        }
        if ([cookieString length] > 0) {
            NSLog(@"Unknown button for cookiestring %@", cookieString);
        }
    }
}

@end

/*  Callback method for the device queue
Will be called for any event of any type (cookie) to which we subscribe
*/
static void QueueCallbackFunction(void* target,  IOReturn result, void* refcon, void* sender) {
    AppleRemote* remote = (AppleRemote*)target;

    IOHIDEventStruct event;
    AbsoluteTime     zeroTime = {0,0};
    NSMutableString* cookieString = [NSMutableString string];
    SInt32           sumOfValues = 0;
    while (result == kIOReturnSuccess)
    {
        result = (*[remote queue])->getNextEvent([remote queue], &event, zeroTime, 0);
        if ( result != kIOReturnSuccess )
            continue;

        //printf("%d %d %d\n", event.elementCookie, event.value, event.longValue);

        if (REMOTE_SWITCH_COOKIE == (int)event.elementCookie) {
            [remote setRemoteId: event.value];
            [remote handleEventWithCookieString: @"19_" sumOfValues: 0];
        } else {
            if (((int)event.elementCookie)!=5) {
                sumOfValues+=event.value;
                [cookieString appendString:[NSString stringWithFormat:@"%d_", event.elementCookie]];
            }
        }
    }

    [remote handleEventWithCookieString: cookieString sumOfValues: sumOfValues];
}

@implementation AppleRemote (IOKitMethods)

- (IOHIDDeviceInterface**) createInterfaceForDevice: (io_object_t) hidDevice {
    io_name_t               className;
    IOCFPlugInInterface**   plugInInterface = NULL;
    HRESULT                 plugInResult = S_OK;
    SInt32                  score = 0;
    IOReturn                ioReturnValue = kIOReturnSuccess;

    hidDeviceInterface = NULL;

    ioReturnValue = IOObjectGetClass(hidDevice, className);

    if (ioReturnValue != kIOReturnSuccess) {
        NSLog(@"Error: Failed to get class name.");
        return NULL;
    }

    ioReturnValue = IOCreatePlugInInterfaceForService(hidDevice,
                                                      kIOHIDDeviceUserClientTypeID,
                                                      kIOCFPlugInInterfaceID,
                                                      &plugInInterface,
                                                      &score);
    if (ioReturnValue == kIOReturnSuccess)
    {
        //Call a method of the intermediate plug-in to create the device interface
        plugInResult = (*plugInInterface)->QueryInterface(plugInInterface, CFUUIDGetUUIDBytes(kIOHIDDeviceInterfaceID), (LPVOID) &hidDeviceInterface);

        if (plugInResult != S_OK) {
            NSLog(@"Error: Couldn't create HID class device interface");
        }
        // Release
        if (plugInInterface) (*plugInInterface)->Release(plugInInterface);
    }
    return hidDeviceInterface;
}

- (io_object_t) findAppleRemoteDevice {
    CFMutableDictionaryRef hidMatchDictionary = NULL;
    IOReturn ioReturnValue = kIOReturnSuccess;
    io_iterator_t hidObjectIterator = 0;
    io_object_t hidDevice = 0;

    // Set up a matching dictionary to search the I/O Registry by class
    // name for all HID class devices
    hidMatchDictionary = IOServiceMatching(AppleRemoteDeviceName);

    // Now search I/O Registry for matching devices.
    ioReturnValue = IOServiceGetMatchingServices(kIOMasterPortDefault, hidMatchDictionary, &hidObjectIterator);

    if ((ioReturnValue == kIOReturnSuccess) && (hidObjectIterator != 0)) {
        hidDevice = IOIteratorNext(hidObjectIterator);
    }

    // release the iterator
    IOObjectRelease(hidObjectIterator);

    return hidDevice;
}

- (BOOL) initializeCookies {
    IOHIDDeviceInterface122** handle = (IOHIDDeviceInterface122**)hidDeviceInterface;
    IOHIDElementCookie      cookie;
    long                    usage;
    long                    usagePage;
    id                      object;
    NSArray*                elements = nil;
    NSDictionary*           element;
    IOReturn success;

    if (!handle || !(*handle)) return NO;

    /* Copy all elements, since we're grabbing most of the elements
     * for this device anyway, and thus, it's faster to iterate them
     * ourselves. When grabbing only one or two elements, a matching
     * dictionary should be passed in here instead of NULL. */
    success = (*handle)->copyMatchingElements(handle, NULL, (CFArrayRef*)&elements);

    if (success == kIOReturnSuccess) {

        [elements autorelease];
        /*
        cookies = calloc(NUMBER_OF_APPLE_REMOTE_ACTIONS, sizeof(IOHIDElementCookie));
        memset(cookies, 0, sizeof(IOHIDElementCookie) * NUMBER_OF_APPLE_REMOTE_ACTIONS);
        */
        allCookies = [[NSMutableArray alloc] init];
        int i;
        for (i=0; i< [elements count]; i++) {
            element = [elements objectAtIndex:i];

            //Get cookie
            object = [element valueForKey: (NSString*)CFSTR(kIOHIDElementCookieKey) ];
            if (object == nil || ![object isKindOfClass:[NSNumber class]]) continue;
            if (object == 0 || CFGetTypeID(object) != CFNumberGetTypeID()) continue;
            cookie = (IOHIDElementCookie) [object longValue];

            //Get usage
            object = [element valueForKey: (NSString*)CFSTR(kIOHIDElementUsageKey) ];
            if (object == nil || ![object isKindOfClass:[NSNumber class]]) continue;
            usage = [object longValue];

            //Get usage page
            object = [element valueForKey: (NSString*)CFSTR(kIOHIDElementUsagePageKey) ];
            if (object == nil || ![object isKindOfClass:[NSNumber class]]) continue;
            usagePage = [object longValue];

            [allCookies addObject: [NSNumber numberWithInt:(int)cookie]];
        }
    } else {
        return NO;
    }

    return YES;
}

- (BOOL) openDevice {
    HRESULT  result;

    IOHIDOptionsType openMode = kIOHIDOptionsTypeNone;
    if ([self isOpenInExclusiveMode]) openMode = kIOHIDOptionsTypeSeizeDevice;
    IOReturn ioReturnValue = (*hidDeviceInterface)->open(hidDeviceInterface, openMode);

    if (ioReturnValue == KERN_SUCCESS) {
        queue = (*hidDeviceInterface)->allocQueue(hidDeviceInterface);
        if (queue) {
            result = (*queue)->create(queue, 0, 12);    //depth: maximum number of elements in queue before oldest elements in queue begin to be lost.

            int i=0;
            for(i=0; i<[allCookies count]; i++) {
                IOHIDElementCookie cookie = (IOHIDElementCookie)[[allCookies objectAtIndex:i] intValue];
                (*queue)->addElement(queue, cookie, 0);
            }

            // add callback for async events
            CFRunLoopSourceRef eventSource;
            ioReturnValue = (*queue)->createAsyncEventSource(queue, &eventSource);
            if (ioReturnValue == KERN_SUCCESS) {
                ioReturnValue = (*queue)->setEventCallout(queue,QueueCallbackFunction, self, NULL);
                if (ioReturnValue == KERN_SUCCESS) {
                    CFRunLoopAddSource(CFRunLoopGetCurrent(), eventSource, kCFRunLoopDefaultMode);
                    //start data delivery to queue
                    (*queue)->start(queue);
                    return YES;
                } else {
                    NSLog(@"Error when setting event callout");
                }
            } else {
                NSLog(@"Error when creating async event source");
            }
        } else {
            NSLog(@"Error when opening device");
        }
    }
    return NO;
}

@end

@implementation AppleRemoteApplicationDelegate

- (id) initWithApplicationDelegate: (id) delegate {
    if (self = [super init]) {
        applicationDelegate = [delegate retain];
    }
    return self;
}

- (void) dealloc {
    NSLog(@"Dealloc");
    [applicationDelegate release];
    [super dealloc];
}

- (id) applicationDelegate {
    return applicationDelegate;
}

- (void)applicationWillBecomeActive:(NSNotification *)aNotification {
    if ([applicationDelegate respondsToSelector: @selector(applicationWillBecomeActive:)]) {
        [applicationDelegate applicationWillBecomeActive: aNotification];
    }
}
- (void)applicationDidBecomeActive:(NSNotification *)aNotification {
    [[AppleRemote sharedRemote] setListeningToRemote: YES];

    if ([applicationDelegate respondsToSelector: @selector(applicationDidBecomeActive:)]) {
        [applicationDelegate applicationDidBecomeActive: aNotification];
    }
}
- (void)applicationWillResignActive:(NSNotification *)aNotification {
    [[AppleRemote sharedRemote] setListeningToRemote: NO];

    if ([applicationDelegate respondsToSelector: @selector(applicationWillResignActive:)]) {
        [applicationDelegate applicationWillResignActive: aNotification];
    }
}
- (void)applicationDidResignActive:(NSNotification *)aNotification {
    if ([applicationDelegate respondsToSelector: @selector(applicationDidResignActive:)]) {
        [applicationDelegate applicationDidResignActive: aNotification];
    }
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {
    NSMethodSignature* signature = [super methodSignatureForSelector: aSelector];
    if (signature == nil && applicationDelegate != nil) {
        signature = [applicationDelegate methodSignatureForSelector: aSelector];
    }
    return signature;
}

- (void)forwardInvocation:(NSInvocation *)invocation {
    SEL aSelector = [invocation selector];

    if (applicationDelegate==nil || [applicationDelegate respondsToSelector:aSelector]==NO) {
        [super forwardInvocation: invocation];
        return;
    }

    [invocation invokeWithTarget:applicationDelegate];
}
@end