AppleRemote.m 25.6 KB
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/*****************************************************************************
 * AppleRemote.m
 * AppleRemote
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 * $Id$
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 *
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 * Created by Martin Kahr on 11.03.06 under a MIT-style license.
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 * Copyright (c) 2006 martinkahr.com. All rights reserved.
 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 *****************************************************************************
 *
 * Note that changes made by any members or contributors of the VideoLAN team
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 * (i.e. changes that were exclusively checked in to one of VideoLAN's source code
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 * repositories) are licensed under the GNU General Public License version 2,
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 * or (at your option) any later version.
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 * Thus, the following statements apply to our changes:
 *
Felix Paul Kühne's avatar
Felix Paul Kühne committed
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 * Copyright (C) 2006-2009 VLC authors and VideoLAN
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 * Authors: Eric Petit <titer@m0k.org>
 *          Felix Kühne <fkuehne at videolan dot org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/
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#import "AppleRemote.h"

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/* this was added by the VideoLAN team to ensure Leopard-compatibility and is VLC-only */
#import "intf.h"
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#import "CompatibilityFixes.h"
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const char* AppleRemoteDeviceName = "AppleIRController";
const int REMOTE_SWITCH_COOKIE=19;
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const NSTimeInterval DEFAULT_MAXIMUM_CLICK_TIME_DIFFERENCE=0.35;
const NSTimeInterval HOLD_RECOGNITION_TIME_INTERVAL=0.4;
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@implementation AppleRemote

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#pragma public interface

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- (id)init
{
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    self = [super init];
    if (self) {
        _openInExclusiveMode = YES;
        queue = NULL;
        hidDeviceInterface = NULL;
        NSMutableDictionary * mutableCookieToButtonMapping = [[NSMutableDictionary alloc] init];

        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonVolume_Plus]    forKey:@"33_31_30_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonVolume_Minus]   forKey:@"33_32_30_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonMenu]           forKey:@"33_22_21_20_2_33_22_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonPlay]           forKey:@"33_23_21_20_2_33_23_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonRight]          forKey:@"33_24_21_20_2_33_24_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonLeft]           forKey:@"33_25_21_20_2_33_25_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonRight_Hold]     forKey:@"33_21_20_14_12_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonLeft_Hold]      forKey:@"33_21_20_13_12_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonMenu_Hold]      forKey:@"33_21_20_2_33_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteButtonPlay_Sleep]     forKey:@"37_33_21_20_2_37_33_21_20_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:k2009RemoteButtonPlay]       forKey:@"33_21_20_8_2_33_21_20_8_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:k2009RemoteButtonFullscreen] forKey:@"33_21_20_3_2_33_21_20_3_2_"];
        [mutableCookieToButtonMapping setObject:[NSNumber numberWithInt:kRemoteControl_Switched]     forKey:@"42_33_23_21_20_2_33_23_21_20_2_"];

        _cookieToButtonMapping = [[NSDictionary alloc] initWithDictionary: mutableCookieToButtonMapping];

        /* defaults */
        _simulatesPlusMinusHold = YES;
        _maximumClickCountTimeDifference = DEFAULT_MAXIMUM_CLICK_TIME_DIFFERENCE;
    }
    return self;
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}

- (void) dealloc {
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    [self stopListening:self];
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}

- (int) remoteId {
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    return remoteId;
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}

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- (BOOL) remoteAvailable {
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    io_object_t hidDevice = [self findAppleRemoteDevice];
    if (hidDevice != 0) {
        IOObjectRelease(hidDevice);
        return YES;
    } else {
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        return NO;
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    }
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}

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- (BOOL) listeningToRemote {
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    return (hidDeviceInterface != NULL && _allCookies != NULL && queue != NULL);
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}

- (void) setListeningToRemote: (BOOL) value {
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    if (value == NO) {
        [self stopListening:self];
    } else {
        [self startListening:self];
    }
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}

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/* Delegates are not retained!
 * http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/CommunicatingWithObjects/chapter_6_section_4.html
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 * Delegating objects do not (and should not) retain their delegates.
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 * However, clients of delegating objects (applications, usually) are responsible for ensuring that their delegates are around
 * to receive delegation messages. To do this, they may have to retain the delegate. */
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- (void) setDelegate: (id) _delegate {
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    if (_delegate && [_delegate respondsToSelector:@selector(appleRemoteButton:pressedDown:clickCount:)]==NO) return;

    delegate = _delegate;
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}
- (id) delegate {
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    return delegate;
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}

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- (BOOL) clickCountingEnabled {
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    return self.clickCountEnabledButtons != 0;
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}
- (void) setClickCountingEnabled: (BOOL) value {
    if (value) {
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        [self setClickCountEnabledButtons: kRemoteButtonVolume_Plus | kRemoteButtonVolume_Minus | kRemoteButtonPlay | kRemoteButtonLeft | kRemoteButtonRight | kRemoteButtonMenu | k2009RemoteButtonPlay | k2009RemoteButtonFullscreen];
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    } else {
        [self setClickCountEnabledButtons: 0];
    }
}

- (BOOL) listeningOnAppActivate {
    id appDelegate = [NSApp delegate];
    return (appDelegate!=nil && [appDelegate isKindOfClass: [AppleRemoteApplicationDelegate class]]);
}
- (void) setListeningOnAppActivate: (BOOL) value {
    if (value) {
        if ([self listeningOnAppActivate]) return;
        AppleRemoteApplicationDelegate* appDelegate = [[AppleRemoteApplicationDelegate alloc] initWithApplicationDelegate: [NSApp delegate]];
        /* NSApp does not retain its delegate therefore we keep retain count on 1 */
        [NSApp setDelegate: appDelegate];
    } else {
        if ([self listeningOnAppActivate]==NO) return;
        AppleRemoteApplicationDelegate* appDelegate = (AppleRemoteApplicationDelegate*)[NSApp delegate];
        id previousAppDelegate = [appDelegate applicationDelegate];
        [NSApp setDelegate: previousAppDelegate];
    }
}

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- (IBAction) startListening: (id) sender {
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    if ([self listeningToRemote]) return;
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    io_object_t hidDevice = [self findAppleRemoteDevice];
    if (hidDevice == 0) return;

    if ([self createInterfaceForDevice:hidDevice] == NULL) {
        goto error;
    }

    if ([self initializeCookies]==NO) {
        goto error;
    }

    if ([self openDevice]==NO) {
        goto error;
    }
    goto cleanup;

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error:
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    [self stopListening:self];

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cleanup:
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    IOObjectRelease(hidDevice);
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}

- (IBAction) stopListening: (id) sender {
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    if (eventSource != NULL) {
        CFRunLoopRemoveSource(CFRunLoopGetCurrent(), eventSource, kCFRunLoopDefaultMode);
        CFRelease(eventSource);
        eventSource = NULL;
    }
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    if (queue != NULL) {
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        (*queue)->stop(queue);
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        //dispose of queue
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        (*queue)->dispose(queue);
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        //release the queue we allocated
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        (*queue)->Release(queue);
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        queue = NULL;
    }

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    if (_allCookies != nil) {
        _allCookies = nil;
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    }

    if (hidDeviceInterface != NULL) {
        //close the device
        (*hidDeviceInterface)->close(hidDeviceInterface);

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        //release the interface
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        (*hidDeviceInterface)->Release(hidDeviceInterface);

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        hidDeviceInterface = NULL;
    }
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}

@end

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@implementation AppleRemote (Singleton)
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static AppleRemote* sharedInstance=nil;

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+ (AppleRemote*) sharedRemote {
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    @synchronized(self) {
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        if (sharedInstance == nil) {
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            sharedInstance = [[self alloc] init];
        }
    }
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    return sharedInstance;
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}
+ (id)allocWithZone:(NSZone *)zone {
    @synchronized(self) {
        if (sharedInstance == nil) {
            return [super allocWithZone:zone];
        }
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    }
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    return sharedInstance;
}
- (id)copyWithZone:(NSZone *)zone {
    return self;
}

@end

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@implementation AppleRemote (PrivateMethods)
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- (void) setRemoteId: (int) value {
    remoteId = value;
}

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- (IOHIDQueueInterface**) queue {
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    return queue;
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}

- (IOHIDDeviceInterface**) hidDeviceInterface {
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    return hidDeviceInterface;
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}

- (NSDictionary*) cookieToButtonMapping {
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    return _cookieToButtonMapping;
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}

- (NSString*) validCookieSubstring: (NSString*) cookieString {
    if (cookieString == nil || [cookieString length] == 0) return nil;
    NSEnumerator* keyEnum = [[self cookieToButtonMapping] keyEnumerator];
    NSString* key;
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    while((key = [keyEnum nextObject])) {
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        NSRange range = [cookieString rangeOfString:key];
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        if (range.location == 0) return key;
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    }
    return nil;
}

- (void) sendSimulatedPlusMinusEvent: (id) time {
    BOOL startSimulateHold = NO;
    AppleRemoteEventIdentifier event = lastPlusMinusEvent;
    @synchronized(self) {
        startSimulateHold = (lastPlusMinusEvent>0 && lastPlusMinusEventTime == [time doubleValue]);
    }
    if (startSimulateHold) {
        lastEventSimulatedHold = YES;
        event = (event==kRemoteButtonVolume_Plus) ? kRemoteButtonVolume_Plus_Hold : kRemoteButtonVolume_Minus_Hold;
        [delegate appleRemoteButton:event pressedDown: YES clickCount: 1];
    }
}

- (void) sendRemoteButtonEvent: (AppleRemoteEventIdentifier) event pressedDown: (BOOL) pressedDown {
    if (delegate) {
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        if (self.simulatesPlusMinusHold) {
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            if (event == kRemoteButtonVolume_Plus || event == kRemoteButtonVolume_Minus) {
                if (pressedDown) {
                    lastPlusMinusEvent = event;
                    lastPlusMinusEventTime = [NSDate timeIntervalSinceReferenceDate];
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                    [self performSelector:@selector(sendSimulatedPlusMinusEvent:)
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                               withObject:[NSNumber numberWithDouble:lastPlusMinusEventTime]
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                               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;
                    }
                }
            }
        }

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        if ((self.clickCountEnabledButtons & event) == event) {
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            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;
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                timeNumber = [NSNumber numberWithDouble:lastClickCountEventTime];
                eventNumber= [NSNumber numberWithUnsignedInt:event];
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            }
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            [self performSelector: @selector(executeClickCountEvent:)
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                       withObject: [NSArray arrayWithObjects: eventNumber, timeNumber, nil]
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                       afterDelay: _maximumClickCountTimeDifference];
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        } else {
            [delegate appleRemoteButton:event pressedDown: pressedDown clickCount:1];
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        }
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    }
}

- (void) executeClickCountEvent: (NSArray*) values {
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    AppleRemoteEventIdentifier event = [[values firstObject] unsignedIntValue];
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    NSTimeInterval eventTimePoint = [[values objectAtIndex:1] doubleValue];
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    BOOL finishedClicking = NO;
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    int finalClickCount = eventClickCount;
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    @synchronized(self) {
        finishedClicking = (event != lastClickCountEvent || eventTimePoint == lastClickCountEventTime);
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        if (finishedClicking) eventClickCount = 0;
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    }

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    if (finishedClicking) {
        [delegate appleRemoteButton:event pressedDown: YES clickCount:finalClickCount];
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        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];
        }
    }

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}

- (void) handleEventWithCookieString: (NSString*) cookieString sumOfValues: (SInt32) sumOfValues {
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    /*
    if (previousRemainingCookieString) {
        cookieString = [previousRemainingCookieString stringByAppendingString: cookieString];
        NSLog(@"New cookie string is %@", cookieString);
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        [previousRemainingCookieString release], previousRemainingCookieString=nil;
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    }*/
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    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;
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        while((subCookieString = [self validCookieSubstring: cookieString])) {
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            cookieString = [cookieString substringFromIndex: [subCookieString length]];
            lastSubCookieString = subCookieString;
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            if (self.processesBacklog) [self handleEventWithCookieString: subCookieString sumOfValues:sumOfValues];
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        }
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        if (self.processesBacklog == NO && lastSubCookieString != nil) {
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            // process the last event of the backlog and assume that the button is not pressed down any longer.
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            // 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.
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            // NSLog(@"processing last event of backlog");
            [self handleEventWithCookieString: lastSubCookieString sumOfValues:0];
        }
        if ([cookieString length] > 0) {
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            msg_Warn( VLCIntf, "Unknown AR button for cookiestring %s", [cookieString UTF8String]);
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        }
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    }
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}

@end

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/*  Callback method for the device queue
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Will be called for any event of any type (cookie) to which we subscribe
*/
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static void QueueCallbackFunction(void* target,  IOReturn result, void* refcon, void* sender) {
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    AppleRemote* remote = (__bridge AppleRemote*)target;
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    IOHIDEventStruct event;
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    AbsoluteTime     zeroTime = {0,0};
    NSMutableString* cookieString = [NSMutableString string];
    SInt32           sumOfValues = 0;
    while (result == kIOReturnSuccess)
    {
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        result = (*[remote queue])->getNextEvent([remote queue], &event, zeroTime, 0);
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        if ( result != kIOReturnSuccess )
            continue;

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

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    [remote handleEventWithCookieString: cookieString sumOfValues: sumOfValues];
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}

@implementation AppleRemote (IOKitMethods)

- (IOHIDDeviceInterface**) createInterfaceForDevice: (io_object_t) hidDevice {
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    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) {
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        msg_Err( VLCIntf, "Failed to get IOKit class name.");
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        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) {
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            msg_Err( VLCIntf, "Couldn't create HID class device interface");
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        }
        // Release
        if (plugInInterface) (*plugInInterface)->Release(plugInInterface);
    }
    return hidDeviceInterface;
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}

- (io_object_t) findAppleRemoteDevice {
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    CFMutableDictionaryRef hidMatchDictionary = NULL;
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    IOReturn ioReturnValue = kIOReturnSuccess;
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    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;
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}

- (BOOL) initializeCookies {
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    IOHIDDeviceInterface122** handle = (IOHIDDeviceInterface122**)hidDeviceInterface;
    IOHIDElementCookie      cookie;
    long                    usage;
    long                    usagePage;
    id                      object;
    NSDictionary*           element;
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    CFArrayRef              elementsRef;
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    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. */
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    success = (*handle)->copyMatchingElements(handle, NULL, &elementsRef);
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    if (success == kIOReturnSuccess) {
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        NSArray *elements = (__bridge NSArray *)elementsRef;

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        /*
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        cookies = calloc(NUMBER_OF_APPLE_REMOTE_ACTIONS, sizeof(IOHIDElementCookie));
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        memset(cookies, 0, sizeof(IOHIDElementCookie) * NUMBER_OF_APPLE_REMOTE_ACTIONS);
        */
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        NSMutableArray *mutableAllCookies = [[NSMutableArray alloc] init];
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        NSUInteger elementCount = [elements count];
        for (NSUInteger i=0; i< elementCount; i++) {
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            element = [elements objectAtIndex:i];
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            //Get cookie
            object = [element valueForKey: (NSString*)CFSTR(kIOHIDElementCookieKey) ];
            if (object == nil || ![object isKindOfClass:[NSNumber class]]) continue;
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            if (object == 0 || CFGetTypeID((__bridge CFTypeRef)(object)) != CFNumberGetTypeID()) continue;
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            cookie = (IOHIDElementCookie) [object longValue];

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

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

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            [mutableAllCookies addObject: [NSNumber numberWithInt:(int)cookie]];
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        }
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        _allCookies = [[NSArray alloc] initWithArray: mutableAllCookies];
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    } else {
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        if (elementsRef)
            CFRelease(elementsRef);
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        return NO;
    }

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    if (elementsRef)
        CFRelease(elementsRef);
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    return YES;
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}

- (BOOL) openDevice {
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    HRESULT  result;

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

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

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

@end

@implementation AppleRemoteApplicationDelegate

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

- (id) applicationDelegate {
    return applicationDelegate;
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}

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- (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];
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    }
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}
- (void)applicationWillResignActive:(NSNotification *)aNotification {
    [[AppleRemote sharedRemote] setListeningToRemote: NO];

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

- (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];
}
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@end