src/control/core.c

   1 /*****************************************************************************
   2  * core.c: Core libvlc new API functions : initialization, exceptions handling
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Clément Stenac <zorglub@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #include "libvlc_internal.h"
  25 #include <vlc/libvlc.h>
  26
  27 #include <vlc_interface.h>
  28
  29 #include <stdarg.h>
  30 #include <limits.h>
  31 #include <assert.h>
  32
  33 static const char nomemstr[] = "Insufficient memory";
  34
  35 /*************************************************************************
  36  * Exceptions handling
  37  *************************************************************************/
  38 void libvlc_exception_init( libvlc_exception_t *p_exception )
  39 {
  40     p_exception->b_raised = 0;
  41     p_exception->psz_message = NULL;
  42 }
  43
  44 void libvlc_exception_clear( libvlc_exception_t *p_exception )
  45 {
  46     if( p_exception->psz_message != nomemstr )
  47         free( p_exception->psz_message );
  48     p_exception->psz_message = NULL;
  49     p_exception->b_raised = 0;
  50 }
  51
  52 int libvlc_exception_raised( const libvlc_exception_t *p_exception )
  53 {
  54     return (NULL != p_exception) && p_exception->b_raised;
  55 }
  56
  57 const char *
  58 libvlc_exception_get_message( const libvlc_exception_t *p_exception )
  59 {
  60     if( p_exception->b_raised == 1 && p_exception->psz_message )
  61     {
  62         return p_exception->psz_message;
  63     }
  64     return NULL;
  65 }
  66
  67 static void libvlc_exception_not_handled( const char *psz )
  68 {
  69     fprintf( stderr, "*** LibVLC Exception not handled: %s\nSet a breakpoint in '%s' to debug.\n",
  70              psz, __func__ );
  71 }
  72
  73 void libvlc_exception_raise( libvlc_exception_t *p_exception,
  74                              const char *psz_format, ... )
  75 {
  76     va_list args;
  77     char * psz;
  78
  79     /* Unformat-ize the message */
  80     va_start( args, psz_format );
  81     if( vasprintf( &psz, psz_format, args ) == -1)
  82         psz = (char *)nomemstr;
  83     va_end( args );
  84
  85     /* Does caller care about exceptions ? */
  86     if( p_exception == NULL ) {
  87         /* Print something, so lazy third-parties can easily
  88          * notice that something may have gone unoticedly wrong */
  89         libvlc_exception_not_handled( psz );
  90         return;
  91     }
  92
  93     /* Make sure that there is no unoticed previous exception */
  94     if( p_exception->b_raised )
  95     {
  96         libvlc_exception_not_handled( p_exception->psz_message );
  97         libvlc_exception_clear( p_exception );
  98     }
  99     p_exception->psz_message = psz;
 100     p_exception->b_raised = 1;
 101 }
 102
 103 libvlc_instance_t * libvlc_new( int argc, const char *const *argv,
 104                                 libvlc_exception_t *p_e )
 105 {
 106     libvlc_instance_t *p_new;
 107
 108     libvlc_int_t *p_libvlc_int = libvlc_InternalCreate();
 109     if( !p_libvlc_int ) RAISENULL( "VLC initialization failed" );
 110
 111     p_new = (libvlc_instance_t *)malloc( sizeof( libvlc_instance_t ) );
 112     if( !p_new ) RAISENULL( "Out of memory" );
 113
 114     const char *my_argv[argc + 2];
 115
 116     my_argv[0] = "libvlc"; /* dummy arg0, skipped by getopt() et al */
 117     for( int i = 0; i < argc; i++ )
 118          my_argv[i + 1] = argv[i];
 119     my_argv[argc + 1] = NULL; /* C calling conventions require a NULL */
 120
 121     /** \todo Look for interface settings. If we don't have any, add -I dummy */
 122     /* Because we probably don't want a GUI by default */
 123
 124     if( libvlc_InternalInit( p_libvlc_int, argc + 1, my_argv ) )
 125         RAISENULL( "VLC initialization failed" );
 126
 127     p_new->p_libvlc_int = p_libvlc_int;
 128     p_new->p_vlm = NULL;
 129     p_new->b_playlist_locked = 0;
 130     p_new->ref_count = 1;
 131     p_new->p_callback_list = NULL;
 132     vlc_mutex_init(&p_new->instance_lock);
 133     vlc_mutex_init(&p_new->event_callback_lock);
 134
 135     return p_new;
 136 }
 137
 138 void libvlc_retain( libvlc_instance_t *p_instance )
 139 {
 140     assert( p_instance != NULL );
 141     assert( p_instance->ref_count < UINT_MAX );
 142
 143     vlc_mutex_lock( &p_instance->instance_lock );
 144     p_instance->ref_count++;
 145     vlc_mutex_unlock( &p_instance->instance_lock );
 146 }
 147
 148 void libvlc_release( libvlc_instance_t *p_instance )
 149 {
 150     vlc_mutex_t *lock = &p_instance->instance_lock;
 151     int refs;
 152
 153     assert( p_instance->ref_count > 0 );
 154
 155     vlc_mutex_lock( lock );
 156     refs = --p_instance->ref_count;
 157     vlc_mutex_unlock( lock );
 158
 159     if( refs == 0 )
 160     {
 161         vlc_mutex_destroy( lock );
 162         vlc_mutex_destroy( &p_instance->event_callback_lock );
 163         libvlc_InternalCleanup( p_instance->p_libvlc_int );
 164         libvlc_InternalDestroy( p_instance->p_libvlc_int, false );
 165         free( p_instance );
 166     }
 167 }
 168
 169 void libvlc_add_intf( libvlc_instance_t *p_i, const char *name,
 170                       libvlc_exception_t *p_e )
 171 {
 172     if( libvlc_InternalAddIntf( p_i->p_libvlc_int, name, false, true, 0, NULL ) )
 173         RAISEVOID( "Interface initialization failed" );
 174 }
 175
 176 void libvlc_wait( libvlc_instance_t *p_i )
 177 {
 178     libvlc_int_t *p_libvlc = p_i->p_libvlc_int;
 179     vlc_object_lock( p_libvlc );
 180     while( vlc_object_alive( p_libvlc ) )
 181         vlc_object_wait( p_libvlc );
 182     vlc_object_unlock( p_libvlc );
 183 }
 184
 185 int libvlc_get_vlc_id( libvlc_instance_t *p_instance )
 186 {
 187     return p_instance->p_libvlc_int->i_object_id;
 188 }
 189
 190 const char * libvlc_get_version()
 191 {
 192     return VLC_Version();
 193 }
 194
 195 const char * libvlc_get_compiler()
 196 {
 197     return VLC_Compiler();
 198 }
 199
 200 const char * libvlc_get_changeset()
 201 {
 202     return VLC_Changeset();
 203 }