modules/video_output/drawable_os2.c

   1 /**
   2  * @file drawable_os2.c
   3  * @brief Legacy monolithic LibVLC video window provider
   4  */
   5 /*****************************************************************************
   6  * Copyright © 2009 Rémi Denis-Courmont
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #include <stdarg.h>
  28 #include <assert.h>
  29
  30 #include <vlc_common.h>
  31 #include <vlc_plugin.h>
  32 #include <vlc_vout_window.h>
  33
  34 #define HWND_TEXT N_("Window handle (HWND)")
  35 #define HWND_LONGTEXT N_( \
  36     "Video will be embedded in this pre-existing window. " \
  37     "If zero, a new window will be created.")
  38
  39 static int Open(vout_window_t *);
  40 static void Close(vout_window_t *);
  41
  42 /*
  43  * Module descriptor
  44  */
  45 vlc_module_begin ()
  46     set_shortname (N_("Drawable"))
  47     set_description (N_("Embedded window video"))
  48     set_category (CAT_VIDEO)
  49     set_subcategory (SUBCAT_VIDEO_VOUT)
  50     set_capability ("vout window", 70)
  51     set_callback(Open)
  52     add_shortcut ("embed-hwnd")
  53
  54     add_integer ("drawable-hwnd", 0, HWND_TEXT, HWND_LONGTEXT, true)
  55         change_volatile ()
  56 vlc_module_end ()
  57
  58 /* Keep a list of busy drawables, so we don't overlap videos if there are
  59  * more than one video track in the stream. */
  60 static vlc_mutex_t serializer = VLC_STATIC_MUTEX;
  61 static uintptr_t *used = NULL;
  62
  63 static const struct vout_window_operations ops = {
  64     .destroy = Close,
  65 };
  66
  67 static void RemoveDrawable(uintptr_t val)
  68 {
  69     size_t n = 0;
  70
  71     /* Remove this drawable from the list of busy ones */
  72     vlc_mutex_lock (&serializer);
  73     assert (used != NULL);
  74     while (used[n] != val)
  75     {
  76         assert (used[n]);
  77         n++;
  78     }
  79     do
  80         used[n] = used[n + 1];
  81     while (used[++n] != 0);
  82
  83     if (n == 1)
  84     {
  85         free (used);
  86         used = NULL;
  87     }
  88     vlc_mutex_unlock (&serializer);
  89 }
  90
  91 /**
  92  * Find the drawable set by libvlc application.
  93  */
  94 static int Open(vout_window_t *wnd)
  95 {
  96     uintptr_t val = var_InheritInteger (wnd, "drawable-hwnd");
  97     if (val == 0)
  98         return VLC_EGENERIC;
  99
 100     uintptr_t *tab;
 101     size_t n = 0;
 102
 103     vlc_mutex_lock (&serializer);
 104     if (used != NULL)
 105         for (/*n = 0*/; used[n]; n++)
 106             if (used[n] == val)
 107             {
 108                 msg_Warn (wnd, "HWND 0x%" PRIXPTR " is busy", val);
 109                 val = 0;
 110                 goto skip;
 111             }
 112
 113     tab = realloc (used, sizeof (*used) * (n + 2));
 114     if (likely(tab != NULL))
 115     {
 116         used = tab;
 117         used[n] = val;
 118         used[n + 1] = 0;
 119     }
 120     else
 121         val = 0;
 122 skip:
 123     vlc_mutex_unlock (&serializer);
 124
 125     if (val == 0)
 126         return VLC_EGENERIC;
 127
 128     wnd->type = VOUT_WINDOW_TYPE_HWND;
 129     wnd->handle.hwnd = (void *)val;
 130     wnd->ops = &ops;
 131     wnd->sys = (void *)val;
 132     return VLC_SUCCESS;
 133 }
 134
 135 /**
 136  * Release the drawable.
 137  */
 138 static void Close (vout_window_t *wnd)
 139 {
 140     uintptr_t val = (uintptr_t)wnd->sys;
 141
 142     RemoveDrawable(val);
 143 }