midi

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media_discoverer.c：源码内容
							/*****************************************************************************
 * media_discoverer.c: libvlc new API media discoverer functions
 *****************************************************************************
 * Copyright (C) 2007 the VideoLAN team
 * $Id: 94b4b0aef6787fbf4526b6f113e16421a55bf991 $
 *
 * Authors: Pierre d'Herbemont <pdherbemont # videolan.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.
 *****************************************************************************/
#include <assert.h>
#include <vlc/libvlc.h>
#include <vlc/libvlc_media.h>
#include <vlc/libvlc_media_list.h>
#include <vlc/libvlc_media_discoverer.h>
#include <vlc/libvlc_events.h>
#include <vlc_services_discovery.h>
#include "libvlc_internal.h"
#include "media_internal.h" // libvlc_media_new_from_input_item()
#include "media_list_internal.h" // _libvlc_media_list_add_media()
struct libvlc_media_discoverer_t
{
    libvlc_event_manager_t * p_event_manager;
    libvlc_instance_t *      p_libvlc_instance;
    services_discovery_t *   p_sd;
    libvlc_media_list_t *    p_mlist;
    bool                     running;
    vlc_dictionary_t         catname_to_submedialist;
};
/*
 * Private functions
 */
/**************************************************************************
 *       services_discovery_item_added (Private) (VLC event callback)
 **************************************************************************/
static void services_discovery_item_added( const vlc_event_t * p_event,
                                           void * user_data )
{
    input_item_t * p_item = p_event->u.services_discovery_item_added.p_new_item;
    const char * psz_cat = p_event->u.services_discovery_item_added.psz_category;
    libvlc_media_t * p_md;
    libvlc_media_discoverer_t * p_mdis = user_data;
    libvlc_media_list_t * p_mlist = p_mdis->p_mlist;
    p_md = libvlc_media_new_from_input_item(
            p_mdis->p_libvlc_instance,
            p_item, NULL );
    /* If we have a category, that mean we have to group the items having
     * that category in a media_list. */
    if( psz_cat )
    {
        p_mlist = vlc_dictionary_value_for_key( &p_mdis->catname_to_submedialist, psz_cat );
        if( p_mlist == kVLCDictionaryNotFound )
        {
            libvlc_media_t * p_catmd;
            p_catmd = libvlc_media_new_as_node( p_mdis->p_libvlc_instance, psz_cat, NULL );
            p_mlist = libvlc_media_subitems( p_catmd, NULL );
            p_mlist->b_read_only = true;
            /* Insert the newly created mlist in our dictionary */
            vlc_dictionary_insert( &p_mdis->catname_to_submedialist, psz_cat, p_mlist );
            /* Insert the md into the root list */
            libvlc_media_list_lock( p_mdis->p_mlist );
            _libvlc_media_list_add_media( p_mdis->p_mlist, p_catmd, NULL );
            libvlc_media_list_unlock( p_mdis->p_mlist );
            /* We don't release the mlist cause the dictionary
             * doesn't retain the object. But we release the md. */
            libvlc_media_release( p_catmd );
        }
    }
    else
    {
        libvlc_media_list_lock( p_mlist );
        _libvlc_media_list_add_media( p_mlist, p_md, NULL );
        libvlc_media_list_unlock( p_mlist );
    }
}
/**************************************************************************
 *       services_discovery_item_removed (Private) (VLC event callback)
 **************************************************************************/
static void services_discovery_item_removed( const vlc_event_t * p_event,
                                             void * user_data )
{
    input_item_t * p_item = p_event->u.services_discovery_item_added.p_new_item;
    libvlc_media_t * p_md;
    libvlc_media_discoverer_t * p_mdis = user_data;
    int i, count = libvlc_media_list_count( p_mdis->p_mlist, NULL );
    libvlc_media_list_lock( p_mdis->p_mlist );
    for( i = 0; i < count; i++ )
    {
        p_md = libvlc_media_list_item_at_index( p_mdis->p_mlist, i, NULL );
        if( p_md->p_input_item == p_item )
        {
            _libvlc_media_list_remove_index( p_mdis->p_mlist, i, NULL );
            break;
        }
    }
    libvlc_media_list_unlock( p_mdis->p_mlist );
}
/**************************************************************************
 *       services_discovery_started (Private) (VLC event callback)
 **************************************************************************/
static void services_discovery_started( const vlc_event_t * p_event,
                                        void * user_data )
{
    VLC_UNUSED(p_event);
    libvlc_media_discoverer_t * p_mdis = user_data;
    libvlc_event_t event;
    p_mdis->running = true;
    event.type = libvlc_MediaDiscovererStarted;
    libvlc_event_send( p_mdis->p_event_manager, &event );
}
/**************************************************************************
 *       services_discovery_ended (Private) (VLC event callback)
 **************************************************************************/
static void services_discovery_ended( const vlc_event_t * p_event,
                                      void * user_data )
{
    VLC_UNUSED(p_event);
    libvlc_media_discoverer_t * p_mdis = user_data;
    libvlc_event_t event;
    p_mdis->running = false;
    event.type = libvlc_MediaDiscovererEnded;
    libvlc_event_send( p_mdis->p_event_manager, &event );
}
/*
 * Public libvlc functions
 */
/**************************************************************************
 *       new (Public)
 *
 * Init an object.
 **************************************************************************/
libvlc_media_discoverer_t *
libvlc_media_discoverer_new_from_name( libvlc_instance_t * p_inst,
                                       const char * psz_name,
                                       libvlc_exception_t * p_e )
{
    libvlc_media_discoverer_t * p_mdis;
    p_mdis = malloc(sizeof(libvlc_media_discoverer_t));
    if( !p_mdis )
    {
        libvlc_exception_raise( p_e, "Not enough memory" );
        return NULL;
    }
    p_mdis->p_libvlc_instance = p_inst;
    p_mdis->p_mlist = libvlc_media_list_new( p_inst, NULL );
    p_mdis->p_mlist->b_read_only = true;
    p_mdis->running = false;
    vlc_dictionary_init( &p_mdis->catname_to_submedialist, 0 );
    p_mdis->p_event_manager = libvlc_event_manager_new( p_mdis,
            p_inst, NULL );
    libvlc_event_manager_register_event_type( p_mdis->p_event_manager,
            libvlc_MediaDiscovererStarted, NULL );
    libvlc_event_manager_register_event_type( p_mdis->p_event_manager,
            libvlc_MediaDiscovererEnded, NULL );
    p_mdis->p_sd = vlc_sd_Create( (vlc_object_t*)p_inst->p_libvlc_int );
    if( !p_mdis->p_sd )
    {
        libvlc_media_list_release( p_mdis->p_mlist );
        libvlc_exception_raise( p_e, "Can't find the services_discovery module named '%s'", psz_name );
        free( p_mdis );
        return NULL;
    }
    vlc_event_attach( services_discovery_EventManager( p_mdis->p_sd ),
                      vlc_ServicesDiscoveryItemAdded,
                      services_discovery_item_added,
                      p_mdis );
    vlc_event_attach( services_discovery_EventManager( p_mdis->p_sd ),
                      vlc_ServicesDiscoveryItemRemoved,
                      services_discovery_item_removed,
                      p_mdis );
    vlc_event_attach( services_discovery_EventManager( p_mdis->p_sd ),
                      vlc_ServicesDiscoveryStarted,
                      services_discovery_started,
                      p_mdis );
    vlc_event_attach( services_discovery_EventManager( p_mdis->p_sd ),
                      vlc_ServicesDiscoveryEnded,
                      services_discovery_ended,
                      p_mdis );
    /* Here we go */
    if( !vlc_sd_Start( p_mdis->p_sd, psz_name ) )
    {
        libvlc_media_list_release( p_mdis->p_mlist );
        libvlc_exception_raise( p_e, "Can't start the services_discovery module named '%s'", psz_name );
        free( p_mdis );
        return NULL;
    }
    return p_mdis;
}
/**************************************************************************
 * release (Public)
 **************************************************************************/
void
libvlc_media_discoverer_release( libvlc_media_discoverer_t * p_mdis )
{
    int i;
    libvlc_media_list_release( p_mdis->p_mlist );
    vlc_sd_StopAndDestroy( p_mdis->p_sd );
    /* Free catname_to_submedialist and all the mlist */
    char ** all_keys = vlc_dictionary_all_keys( &p_mdis->catname_to_submedialist );
    for( i = 0; all_keys[i]; i++ )
    {
        libvlc_media_list_t * p_catmlist = vlc_dictionary_value_for_key( &p_mdis->catname_to_submedialist, all_keys[i] );
        libvlc_media_list_release( p_catmlist );
        free( all_keys[i] );
    }
    free( all_keys );
    vlc_dictionary_clear( &p_mdis->catname_to_submedialist, NULL, NULL );
    libvlc_event_manager_release( p_mdis->p_event_manager );
    free( p_mdis );
}
/**************************************************************************
 * localized_name (Public)
 **************************************************************************/
char *
libvlc_media_discoverer_localized_name( libvlc_media_discoverer_t * p_mdis )
{
    return services_discovery_GetLocalizedName( p_mdis->p_sd );
}
/**************************************************************************
 * media_list (Public)
 **************************************************************************/
libvlc_media_list_t *
libvlc_media_discoverer_media_list( libvlc_media_discoverer_t * p_mdis )
{
    libvlc_media_list_retain( p_mdis->p_mlist );
    return p_mdis->p_mlist;
}
/**************************************************************************
 * event_manager (Public)
 **************************************************************************/
libvlc_event_manager_t *
libvlc_media_discoverer_event_manager( libvlc_media_discoverer_t * p_mdis )
{
    return p_mdis->p_event_manager;
}
/**************************************************************************
 * running (Public)
 **************************************************************************/
int
libvlc_media_discoverer_is_running( libvlc_media_discoverer_t * p_mdis )
{
    return p_mdis->running;
}

						