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vlc/lib/media_discoverer.c

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/*****************************************************************************
* media_discoverer.c: libvlc new API media discoverer functions
*****************************************************************************
* Copyright (C) 2007 VLC authors and VideoLAN
*
* 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 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.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <vlc/libvlc.h>
#include <vlc/libvlc_picture.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_internal_add_media()
struct libvlc_media_discoverer_t
{
libvlc_instance_t * p_libvlc_instance;
services_discovery_t * p_sd;
libvlc_media_list_t * p_mlist;
char name[];
};
/*
* Private functions
*/
/**************************************************************************
* services_discovery_item_added (Private) (VLC event callback)
**************************************************************************/
static void services_discovery_item_added( services_discovery_t *sd,
input_item_t *parent,
input_item_t *p_item )
{
libvlc_media_t * p_md;
libvlc_media_discoverer_t *p_mdis = sd->owner.sys;
libvlc_media_list_t * p_mlist = p_mdis->p_mlist;
p_md = libvlc_media_new_from_input_item( p_item );
(void) parent; /* Flatten items list for now. TODO: tree support. */
libvlc_media_list_lock( p_mlist );
libvlc_media_list_internal_add_media( p_mlist, p_md );
libvlc_media_list_unlock( p_mlist );
libvlc_media_release( p_md );
}
/**************************************************************************
* services_discovery_item_removed (Private) (VLC event callback)
**************************************************************************/
static void services_discovery_item_removed( services_discovery_t *sd,
input_item_t *p_item )
{
libvlc_media_t * p_md;
libvlc_media_discoverer_t *p_mdis = sd->owner.sys;
int i, count = libvlc_media_list_count( p_mdis->p_mlist );
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 );
assert(p_md != NULL);
if( p_md->p_input_item == p_item )
{
libvlc_media_list_internal_remove_index( p_mdis->p_mlist, i );
libvlc_media_release( p_md );
break;
}
libvlc_media_release( p_md );
}
libvlc_media_list_unlock( p_mdis->p_mlist );
}
/*
* Public libvlc functions
*/
/**************************************************************************
* new (Public)
**************************************************************************/
libvlc_media_discoverer_t *
libvlc_media_discoverer_new( libvlc_instance_t * p_inst, const char * psz_name )
{
/* podcast SD is a hack and only works with custom playlist callbacks. */
if( !strncasecmp( psz_name, "podcast", 7 ) )
return NULL;
libvlc_media_discoverer_t *p_mdis;
p_mdis = malloc(sizeof(*p_mdis) + strlen(psz_name) + 1);
if( unlikely(p_mdis == NULL) )
{
libvlc_printerr( "Not enough memory" );
return NULL;
}
p_mdis->p_libvlc_instance = p_inst;
p_mdis->p_mlist = libvlc_media_list_new();
p_mdis->p_mlist->b_read_only = true;
p_mdis->p_sd = NULL;
libvlc_retain( p_inst );
strcpy( p_mdis->name, psz_name );
return p_mdis;
}
static const struct services_discovery_callbacks sd_cbs = {
.item_added = services_discovery_item_added,
.item_removed = services_discovery_item_removed,
};
/**************************************************************************
* start (Public)
**************************************************************************/
LIBVLC_API int
libvlc_media_discoverer_start( libvlc_media_discoverer_t * p_mdis )
{
struct services_discovery_owner_t owner = {
&sd_cbs,
p_mdis,
};
/* Here we go */
p_mdis->p_sd = vlc_sd_Create( VLC_OBJECT(p_mdis->p_libvlc_instance->p_libvlc_int),
p_mdis->name, &owner );
if( p_mdis->p_sd == NULL )
{
libvlc_printerr( "%s: no such discovery module found", p_mdis->name );
return -1;
}
return 0;
}
/**************************************************************************
* stop (Public)
**************************************************************************/
LIBVLC_API void
libvlc_media_discoverer_stop( libvlc_media_discoverer_t * p_mdis )
{
libvlc_media_list_t * p_mlist = p_mdis->p_mlist;
libvlc_media_list_lock( p_mlist );
libvlc_media_list_internal_end_reached( p_mlist );
libvlc_media_list_unlock( p_mlist );
vlc_sd_Destroy( p_mdis->p_sd );
p_mdis->p_sd = NULL;
}
/**************************************************************************
* release (Public)
**************************************************************************/
void
libvlc_media_discoverer_release( libvlc_media_discoverer_t * p_mdis )
{
if( p_mdis->p_sd != NULL )
libvlc_media_discoverer_stop( p_mdis );
libvlc_media_list_release( p_mdis->p_mlist );
libvlc_release( p_mdis->p_libvlc_instance );
free( p_mdis );
}
/**************************************************************************
* 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;
}
/**************************************************************************
* running (Public)
**************************************************************************/
bool libvlc_media_discoverer_is_running(libvlc_media_discoverer_t * p_mdis)
{
return p_mdis->p_sd != NULL;
}
void
libvlc_media_discoverer_list_release( libvlc_media_discoverer_description_t **pp_services,
size_t i_count )
{
if( i_count > 0 )
{
for( size_t i = 0; i < i_count; ++i )
{
free( pp_services[i]->psz_name );
free( pp_services[i]->psz_longname );
}
free( *pp_services );
free( pp_services );
}
}
size_t
libvlc_media_discoverer_list_get( libvlc_instance_t *p_inst,
libvlc_media_discoverer_category_t i_cat,
libvlc_media_discoverer_description_t ***ppp_services )
{
assert( p_inst != NULL && ppp_services != NULL );
int i_core_cat;
switch( i_cat )
{
case libvlc_media_discoverer_devices:
i_core_cat = SD_CAT_DEVICES;
break;
case libvlc_media_discoverer_lan:
i_core_cat = SD_CAT_LAN;
break;
case libvlc_media_discoverer_podcasts:
i_core_cat = SD_CAT_INTERNET;
break;
case libvlc_media_discoverer_localdirs:
i_core_cat = SD_CAT_MYCOMPUTER;
break;
default:
vlc_assert_unreachable();
*ppp_services = NULL;
return 0;
}
/* Fetch all sd names, longnames and categories */
char **ppsz_names, **ppsz_longnames;
int *p_categories;
ppsz_names = vlc_sd_GetNames( p_inst->p_libvlc_int, &ppsz_longnames,
&p_categories );
if( ppsz_names == NULL )
{
*ppp_services = NULL;
return 0;
}
/* Count the number of sd matching our category (i_cat/i_core_cat) */
size_t i_nb_services = 0;
char **ppsz_name = ppsz_names;
int *p_category = p_categories;
for( ; *ppsz_name != NULL; ppsz_name++, p_category++ )
{
if( *p_category == i_core_cat )
i_nb_services++;
}
libvlc_media_discoverer_description_t **pp_services = NULL, *p_services = NULL;
if( i_nb_services > 0 )
{
/* Double alloc here, so that the caller iterates through pointers of
* struct instead of structs. This allows us to modify the struct
* without breaking the API. */
pp_services = malloc( i_nb_services
* sizeof(libvlc_media_discoverer_description_t *) );
p_services = malloc( i_nb_services
* sizeof(libvlc_media_discoverer_description_t) );
if( pp_services == NULL || p_services == NULL )
{
free( pp_services );
free( p_services );
pp_services = NULL;
p_services = NULL;
i_nb_services = 0;
/* Even if alloc fails, the next loop must be run in order to free
* names returned by vlc_sd_GetNames */
}
}
/* Fill output pp_services or free unused name, longname */
char **ppsz_longname = ppsz_longnames;
ppsz_name = ppsz_names;
p_category = p_categories;
unsigned int i_service_idx = 0;
libvlc_media_discoverer_description_t *p_service = p_services;
for( ; *ppsz_name != NULL; ppsz_name++, ppsz_longname++, p_category++ )
{
if( pp_services != NULL && *p_category == i_core_cat )
{
p_service->psz_name = *ppsz_name;
p_service->psz_longname = *ppsz_longname;
p_service->i_cat = i_cat;
pp_services[i_service_idx++] = p_service++;
}
else
{
free( *ppsz_name );
free( *ppsz_longname );
}
}
free( ppsz_names );
free( ppsz_longnames );
free( p_categories );
*ppp_services = pp_services;
return i_nb_services;
}
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