lib/renderer_discoverer.c

   1 /*****************************************************************************
   2  * renderer_discoverer.c: libvlc renderer API
   3  *****************************************************************************
   4  * Copyright © 2016 VLC authors and VideoLAN
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include "config.h"
  23 #endif
  24
  25 #include <assert.h>
  26
  27 #include <vlc/libvlc.h>
  28 #include <vlc/libvlc_renderer_discoverer.h>
  29
  30 #include <vlc_common.h>
  31
  32 #include "libvlc_internal.h"
  33 #include "renderer_discoverer_internal.h"
  34
  35 struct libvlc_renderer_discoverer_t
  36 {
  37     libvlc_event_manager_t  event_manager;
  38     vlc_object_t *          p_object;
  39     vlc_renderer_discovery_t *p_rd;
  40
  41     int                     i_items;
  42     vlc_renderer_item_t **  pp_items;
  43     char                    name[];
  44 };
  45
  46 static_assert( VLC_RENDERER_CAN_AUDIO == LIBVLC_RENDERER_CAN_AUDIO &&
  47                VLC_RENDERER_CAN_VIDEO == LIBVLC_RENDERER_CAN_VIDEO,
  48               "core/libvlc renderer flags mismatch" );
  49
  50 const vlc_renderer_item_t *
  51 libvlc_renderer_item_to_vlc( const libvlc_renderer_item_t *p_item )
  52 {
  53     return (const vlc_renderer_item_t*) p_item;
  54 }
  55
  56 static void renderer_discovery_item_added( vlc_renderer_discovery_t *rd,
  57                                            vlc_renderer_item_t *p_item )
  58 {
  59     libvlc_renderer_discoverer_t *p_lrd = rd->owner.sys;
  60
  61     vlc_renderer_item_hold( p_item );
  62
  63     TAB_APPEND( p_lrd->i_items, p_lrd->pp_items, p_item );
  64
  65     libvlc_event_t event = {
  66         .type = libvlc_RendererDiscovererItemAdded,
  67         .u.renderer_discoverer_item_added.item =
  68             (libvlc_renderer_item_t*) p_item,
  69     };
  70     libvlc_event_send( &p_lrd->event_manager, &event );
  71 }
  72
  73 static void renderer_discovery_item_removed( vlc_renderer_discovery_t *rd,
  74                                              vlc_renderer_item_t *p_item )
  75 {
  76     libvlc_renderer_discoverer_t *p_lrd = rd->owner.sys;
  77
  78     int i_idx;
  79     TAB_FIND( p_lrd->i_items, p_lrd->pp_items, p_item, i_idx );
  80     assert( i_idx != -1 );
  81     TAB_ERASE( p_lrd->i_items, p_lrd->pp_items, i_idx );
  82
  83     libvlc_event_t event = {
  84         .type = libvlc_RendererDiscovererItemDeleted,
  85         .u.renderer_discoverer_item_deleted.item =
  86             (libvlc_renderer_item_t*) p_item,
  87     };
  88     libvlc_event_send( &p_lrd->event_manager, &event );
  89
  90     vlc_renderer_item_release( p_item );
  91 }
  92
  93 const char *
  94 libvlc_renderer_item_name( const libvlc_renderer_item_t *p_item )
  95 {
  96     return vlc_renderer_item_name( (vlc_renderer_item_t *) p_item );
  97 }
  98
  99 const char *
 100 libvlc_renderer_item_type( const libvlc_renderer_item_t *p_item )
 101 {
 102     return vlc_renderer_item_type( (vlc_renderer_item_t *) p_item );
 103 }
 104
 105 const char *
 106 libvlc_renderer_item_icon_uri( const libvlc_renderer_item_t *p_item )
 107 {
 108     return vlc_renderer_item_icon_uri( (vlc_renderer_item_t *) p_item );
 109 }
 110
 111 int
 112 libvlc_renderer_item_flags( const libvlc_renderer_item_t *p_item )
 113 {
 114     return vlc_renderer_item_flags( (vlc_renderer_item_t *) p_item );
 115 }
 116
 117 libvlc_renderer_discoverer_t *
 118 libvlc_renderer_discoverer_new( libvlc_instance_t *p_inst,
 119                                 const char *psz_name )
 120 {
 121     size_t len = strlen( psz_name ) + 1;
 122     libvlc_renderer_discoverer_t *p_lrd = malloc( sizeof(*p_lrd) + len );
 123
 124     if( unlikely(p_lrd == NULL) )
 125         return NULL;
 126
 127     p_lrd->p_object = VLC_OBJECT(p_inst->p_libvlc_int);
 128     memcpy( p_lrd->name, psz_name, len );
 129     TAB_INIT( p_lrd->i_items, p_lrd->pp_items );
 130     p_lrd->p_rd = NULL;
 131     libvlc_event_manager_init( &p_lrd->event_manager, p_lrd );
 132
 133     return p_lrd;
 134 }
 135
 136 void
 137 libvlc_renderer_discoverer_release( libvlc_renderer_discoverer_t *p_lrd )
 138 {
 139     libvlc_renderer_discoverer_stop( p_lrd );
 140     libvlc_event_manager_destroy( &p_lrd->event_manager );
 141     free( p_lrd );
 142 }
 143
 144 int
 145 libvlc_renderer_discoverer_start( libvlc_renderer_discoverer_t *p_lrd )
 146 {
 147     assert( p_lrd->p_rd == NULL );
 148
 149     struct vlc_renderer_discovery_owner owner =
 150     {
 151         p_lrd,
 152         renderer_discovery_item_added,
 153         renderer_discovery_item_removed,
 154     };
 155
 156     p_lrd->p_rd = vlc_rd_new( p_lrd->p_object, p_lrd->name, &owner );
 157     return p_lrd->p_rd != NULL ? 0 : -1;
 158 }
 159
 160 void
 161 libvlc_renderer_discoverer_stop( libvlc_renderer_discoverer_t *p_lrd )
 162 {
 163     if( p_lrd->p_rd != NULL )
 164         vlc_rd_release( p_lrd->p_rd );
 165
 166     for( int i = 0; i < p_lrd->i_items; ++i )
 167         vlc_renderer_item_release( p_lrd->pp_items[i] );
 168     TAB_CLEAN( p_lrd->i_items, p_lrd->pp_items );
 169 }
 170
 171 libvlc_event_manager_t *
 172 libvlc_renderer_discoverer_event_manager( libvlc_renderer_discoverer_t *p_lrd )
 173 {
 174     return &p_lrd->event_manager;
 175 }
 176
 177 void
 178 libvlc_renderer_discoverer_list_release( libvlc_rd_description_t **pp_services,
 179                                          size_t i_count )
 180 {
 181     if( i_count > 0 )
 182     {
 183         for( size_t i = 0; i < i_count; ++i )
 184         {
 185             free( pp_services[i]->psz_name );
 186             free( pp_services[i]->psz_longname );
 187         }
 188         free( *pp_services );
 189         free( pp_services );
 190     }
 191 }
 192
 193 size_t
 194 libvlc_renderer_discoverer_list_get( libvlc_instance_t *p_inst,
 195                                      libvlc_rd_description_t ***ppp_services )
 196 {
 197     assert( p_inst != NULL && ppp_services != NULL );
 198
 199     /* Fetch all rd names, and longnames */
 200     char **ppsz_names, **ppsz_longnames;
 201     int i_ret = vlc_rd_get_names( p_inst->p_libvlc_int, &ppsz_names,
 202                                   &ppsz_longnames );
 203
 204     if( i_ret != VLC_SUCCESS )
 205     {
 206         *ppp_services = NULL;
 207         return 0;
 208     }
 209
 210     /* Count the number of sd matching our category (i_cat/i_core_cat) */
 211     size_t i_nb_services = 0;
 212     char **ppsz_name = ppsz_names;
 213     for( ; *ppsz_name != NULL; ppsz_name++ )
 214         i_nb_services++;
 215
 216     libvlc_rd_description_t **pp_services = NULL,
 217                                               *p_services = NULL;
 218     if( i_nb_services > 0 )
 219     {
 220         /* Double alloc here, so that the caller iterates through pointers of
 221          * struct instead of structs. This allows us to modify the struct
 222          * without breaking the API. */
 223
 224         pp_services =
 225             malloc( i_nb_services
 226                     * sizeof(libvlc_rd_description_t *) );
 227         p_services =
 228             malloc( i_nb_services
 229                     * sizeof(libvlc_rd_description_t) );
 230         if( pp_services == NULL || p_services == NULL )
 231         {
 232             free( pp_services );
 233             free( p_services );
 234             pp_services = NULL;
 235             p_services = NULL;
 236             i_nb_services = 0;
 237             /* Even if alloc fails, the next loop must be run in order to free
 238              * names returned by vlc_sd_GetNames */
 239         }
 240     }
 241
 242     /* Fill output pp_services or free unused name, longname */
 243     char **ppsz_longname = ppsz_longnames;
 244     unsigned int i_service_idx = 0;
 245     libvlc_rd_description_t *p_service = p_services;
 246     for( ppsz_name = ppsz_names; *ppsz_name != NULL; ppsz_name++, ppsz_longname++ )
 247     {
 248         if( pp_services != NULL )
 249         {
 250             p_service->psz_name = *ppsz_name;
 251             p_service->psz_longname = *ppsz_longname;
 252             pp_services[i_service_idx++] = p_service++;
 253         }
 254         else
 255         {
 256             free( *ppsz_name );
 257             free( *ppsz_longname );
 258         }
 259     }
 260     free( ppsz_names );
 261     free( ppsz_longnames );
 262
 263     *ppp_services = pp_services;
 264     return i_nb_services;
 265 }