VLCKit/Sources/VLCMediaDiscoverer.m

/*****************************************************************************
 * VLCMediaDiscoverer.m: VLCKit.framework VLCMediaDiscoverer implementation
 *****************************************************************************
 * Copyright (C) 2007 Pierre d'Herbemont
 * Copyright (C) 2014-2015 Felix Paul Kühne
 * Copyright (C) 2007, 2015 VLC authors and VideoLAN
 * $Id$
 *
 * Authors: Pierre d'Herbemont <pdherbemont # videolan.org>
 *          Felix Paul Kühne <fkuehne # videolan dot org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.
 *****************************************************************************/

#import "VLCMediaDiscoverer.h"
#import "VLCLibrary.h"
#import "VLCLibVLCBridging.h"
#import "VLCEventManager.h"

#include <vlc/libvlc.h>
#include <vlc/libvlc_media_discoverer.h>

@interface VLCMediaDiscoverer ()
{
    NSString *_localizedName;
    VLCMediaList *_discoveredMedia;
    void *_mdis;
    BOOL _running;

    VLCLibrary *_privateLibrary;
}

/**
 * libvlc told us that the discoverer is actually running
 */
- (void)_mediaDiscovererStarted;

/**
 * libvlc told us that the discoverer stopped running
 */
- (void)_mediaDiscovererEnded;

@end

static NSArray *availableMediaDiscoverer = nil;     // Global list of media discoverers

/* libvlc event callback */
static void HandleMediaDiscovererStarted(const libvlc_event_t *event, void *self)
{
    @autoreleasepool {
        [[VLCEventManager sharedManager] callOnMainThreadObject:(__bridge id)(self)
                                                     withMethod:@selector(_mediaDiscovererStarted)
                                           withArgumentAsObject:@(event->type)];
    }
}

static void HandleMediaDiscovererEnded(const libvlc_event_t *event, void *self)
{
    @autoreleasepool {
        [[VLCEventManager sharedManager] callOnMainThreadObject:(__bridge id)(self)
                                                     withMethod:@selector(_mediaDiscovererEnded)
                                           withArgumentAsObject:@(event->type)];
    }
}


@implementation VLCMediaDiscoverer
@synthesize libraryInstance = _privateLibrary;

+ (NSArray *)availableMediaDiscoverer
{
    if (!availableMediaDiscoverer) {
        availableMediaDiscoverer = @[[[VLCMediaDiscoverer alloc] initWithName:@"sap"],
                                [[VLCMediaDiscoverer alloc] initWithName:@"upnp"],
                                [[VLCMediaDiscoverer alloc] initWithName:@"freebox"],
                                [[VLCMediaDiscoverer alloc] initWithName:@"video_dir"]];
    }
    return availableMediaDiscoverer;
}

- (instancetype)initWithName:(NSString *)aServiceName
{
    if (self = [super init]) {
        _localizedName = nil;
        _discoveredMedia = nil;

        _privateLibrary = [VLCLibrary sharedLibrary];
        libvlc_retain([_privateLibrary instance]);

        _mdis = libvlc_media_discoverer_new([_privateLibrary instance],
                                            [aServiceName UTF8String]);

        if (_mdis == NULL) {
            VKLog(@"media discovery initialization failed, maybe no such module?");
            return NULL;
        }

        libvlc_event_manager_t *em = libvlc_media_discoverer_event_manager(_mdis);
        if (em) {
            libvlc_event_attach(em, libvlc_MediaDiscovererStarted, HandleMediaDiscovererStarted, (__bridge void *)(self));
            libvlc_event_attach(em, libvlc_MediaDiscovererEnded,   HandleMediaDiscovererEnded,   (__bridge void *)(self));
        }
    }
    return self;
}

- (void)dealloc
{
    if (_running)
        [self stopDiscoverer];

    [[VLCEventManager sharedManager] cancelCallToObject:self];

    libvlc_event_manager_t *em = libvlc_media_discoverer_event_manager(_mdis);
    if (em) {
        libvlc_event_detach(em, libvlc_MediaDiscovererStarted, HandleMediaDiscovererStarted, (__bridge void *)(self));
        libvlc_event_detach(em, libvlc_MediaDiscovererEnded,   HandleMediaDiscovererEnded,   (__bridge void *)(self));
    }

    libvlc_media_discoverer_release(_mdis);

    libvlc_release(_privateLibrary.instance);
}

- (int)startDiscoverer
{
    int returnValue = libvlc_media_discoverer_start(_mdis);
    if (returnValue == -1)
        VKLog(@"media discovery start failed");

    _running = libvlc_media_discoverer_is_running(_mdis);

    libvlc_media_list_t *p_mlist = libvlc_media_discoverer_media_list(_mdis);
    VLCMediaList *ret = [VLCMediaList mediaListWithLibVLCMediaList:p_mlist];
    libvlc_media_list_release(p_mlist);

    _discoveredMedia = ret;

    return returnValue;
}

- (void)stopDiscoverer
{
    if (!_mdis) {
        _running = NO;
        return;
    }

    libvlc_media_discoverer_stop(_mdis);
    _running = libvlc_media_discoverer_is_running(_mdis);
}

- (VLCMediaList *)discoveredMedia
{
    return _discoveredMedia;
}

- (NSString *)localizedName
{
    if (_localizedName)
        return _localizedName;

    char *name = libvlc_media_discoverer_localized_name(_mdis);
    if (name) {
        _localizedName = @(name);
        free(name);
    }
    return _localizedName;
}

- (BOOL)isRunning
{
    return _running;
}

- (void)_mediaDiscovererStarted
{
    [self willChangeValueForKey:@"running"];
    _running = YES;
    [self didChangeValueForKey:@"running"];

    if (self.delegate) {
        if ([self.delegate respondsToSelector:@selector(discovererStarted:)])
            [self.delegate discovererStarted:self];
    }
}

- (void)_mediaDiscovererEnded
{
    [self willChangeValueForKey:@"running"];
    _running = NO;
    [self didChangeValueForKey:@"running"];

    if (self.delegate) {
        if ([self.delegate respondsToSelector:@selector(discovererStopped:)])
            [self.delegate discovererStopped:self];
    }
}
@end