gst-libs/gst/vaapi/gstvaapidisplay_x11.c

   1 /*
   2  *  gstvaapidisplay_x11.c - VA/X11 display abstraction
   3  *
   4  *  gstreamer-vaapi (C) 2010 Splitted-Desktop Systems
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 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 General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  19  */
  20
  21 /**
  22  * SECTION:gst-vaapi-display-x11
  23  * @short_description:
  24  */
  25
  26 #include "config.h"
  27 #include "gstvaapiutils.h"
  28 #include "gstvaapidisplay_x11.h"
  29
  30 #define DEBUG 1
  31 #include "gstvaapidebug.h"
  32
  33 G_DEFINE_TYPE(GstVaapiDisplayX11,
  34               gst_vaapi_display_x11,
  35               GST_VAAPI_TYPE_DISPLAY);
  36
  37 #define GST_VAAPI_DISPLAY_X11_GET_PRIVATE(obj)                  \
  38     (G_TYPE_INSTANCE_GET_PRIVATE((obj),                         \
  39                                  GST_VAAPI_TYPE_DISPLAY_X11,    \
  40                                  GstVaapiDisplayX11Private))
  41
  42 struct _GstVaapiDisplayX11Private {
  43     gboolean    create_display;
  44     gchar      *display_name;
  45     Display    *x11_display;
  46     int         x11_screen;
  47     VADisplay  *va_display;
  48 };
  49
  50 enum {
  51     PROP_0,
  52
  53     PROP_DISPLAY_NAME,
  54     PROP_X11_DISPLAY
  55 };
  56
  57 static void
  58 gst_vaapi_display_x11_finalize(GObject *object)
  59 {
  60     G_OBJECT_CLASS(gst_vaapi_display_x11_parent_class)->finalize(object);
  61 }
  62
  63 static void
  64 set_display_name(GstVaapiDisplayX11 *display, const gchar *display_name)
  65 {
  66     GstVaapiDisplayX11Private * const priv = display->priv;
  67
  68     g_free(priv->display_name);
  69
  70     if (display_name)
  71         priv->display_name = g_strdup(display_name);
  72     else
  73         priv->display_name = NULL;
  74 }
  75
  76 static void
  77 gst_vaapi_display_x11_set_property(
  78     GObject      *object,
  79     guint         prop_id,
  80     const GValue *value,
  81     GParamSpec   *pspec
  82 )
  83 {
  84     GstVaapiDisplayX11 * const display = GST_VAAPI_DISPLAY_X11(object);
  85
  86     switch (prop_id) {
  87     case PROP_DISPLAY_NAME:
  88         set_display_name(display, g_value_get_string(value));
  89         break;
  90     case PROP_X11_DISPLAY:
  91         display->priv->x11_display = g_value_get_pointer(value);
  92         break;
  93     default:
  94         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
  95         break;
  96     }
  97 }
  98
  99 static void
 100 gst_vaapi_display_x11_get_property(
 101     GObject    *object,
 102     guint       prop_id,
 103     GValue     *value,
 104     GParamSpec *pspec
 105 )
 106 {
 107     GstVaapiDisplayX11 * const display = GST_VAAPI_DISPLAY_X11(object);
 108
 109     switch (prop_id) {
 110     case PROP_DISPLAY_NAME:
 111         g_value_set_string(value, display->priv->display_name);
 112         break;
 113     case PROP_X11_DISPLAY:
 114         g_value_set_pointer(value, gst_vaapi_display_x11_get_display(display));
 115         break;
 116     default:
 117         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 118         break;
 119     }
 120 }
 121
 122 static void
 123 gst_vaapi_display_x11_constructed(GObject *object)
 124 {
 125     GstVaapiDisplayX11 * const display = GST_VAAPI_DISPLAY_X11(object);
 126     GObjectClass *parent_class;
 127
 128     display->priv->create_display = display->priv->x11_display == NULL;
 129
 130     /* Reset display-name if the user provided his own X11 display */
 131     if (!display->priv->create_display)
 132         set_display_name(display, XDisplayString(display->priv->x11_display));
 133
 134     parent_class = G_OBJECT_CLASS(gst_vaapi_display_x11_parent_class);
 135     if (parent_class->constructed)
 136         parent_class->constructed(object);
 137 }
 138
 139 static gboolean
 140 gst_vaapi_display_x11_open_display(GstVaapiDisplay *display)
 141 {
 142     GstVaapiDisplayX11Private * const priv =
 143         GST_VAAPI_DISPLAY_X11(display)->priv;
 144
 145     /* XXX: maintain an X11 display cache */
 146     if (!priv->x11_display && priv->create_display)
 147         priv->x11_display = XOpenDisplay(priv->display_name);
 148     if (!priv->x11_display)
 149         return FALSE;
 150
 151     priv->x11_screen = DefaultScreen(priv->x11_display);
 152     priv->va_display = vaGetDisplay(priv->x11_display);
 153     return priv->va_display != NULL;
 154 }
 155
 156 static void
 157 gst_vaapi_display_x11_close_display(GstVaapiDisplay *display)
 158 {
 159     GstVaapiDisplayX11Private * const priv =
 160         GST_VAAPI_DISPLAY_X11(display)->priv;
 161
 162     if (priv->x11_display) {
 163         if (priv->create_display)
 164             XCloseDisplay(priv->x11_display);
 165         priv->x11_display = NULL;
 166     }
 167
 168     if (priv->display_name) {
 169         g_free(priv->display_name);
 170         priv->display_name = NULL;
 171     }
 172
 173     priv->va_display = NULL;
 174 }
 175
 176 static VADisplay
 177 gst_vaapi_display_x11_get_va_display(GstVaapiDisplay *display)
 178 {
 179     return GST_VAAPI_DISPLAY_X11(display)->priv->va_display;
 180 }
 181
 182 static void
 183 gst_vaapi_display_x11_get_size(
 184     GstVaapiDisplay *display,
 185     guint           *pwidth,
 186     guint           *pheight
 187 )
 188 {
 189     GstVaapiDisplayX11Private * const priv = GST_VAAPI_DISPLAY_X11(display)->priv;
 190
 191     if (!priv->x11_display)
 192         return;
 193
 194     if (pwidth)
 195         *pwidth = DisplayWidth(priv->x11_display, priv->x11_screen);
 196
 197     if (pheight)
 198         *pheight = DisplayHeight(priv->x11_display, priv->x11_screen);
 199 }
 200
 201 static void
 202 gst_vaapi_display_x11_class_init(GstVaapiDisplayX11Class *klass)
 203 {
 204     GObjectClass * const object_class = G_OBJECT_CLASS(klass);
 205     GstVaapiDisplayClass * const dpy_class = GST_VAAPI_DISPLAY_CLASS(klass);
 206
 207     g_type_class_add_private(klass, sizeof(GstVaapiDisplayX11Private));
 208
 209     object_class->finalize      = gst_vaapi_display_x11_finalize;
 210     object_class->set_property  = gst_vaapi_display_x11_set_property;
 211     object_class->get_property  = gst_vaapi_display_x11_get_property;
 212     object_class->constructed   = gst_vaapi_display_x11_constructed;
 213
 214     dpy_class->open_display     = gst_vaapi_display_x11_open_display;
 215     dpy_class->close_display    = gst_vaapi_display_x11_close_display;
 216     dpy_class->get_display      = gst_vaapi_display_x11_get_va_display;
 217     dpy_class->get_size         = gst_vaapi_display_x11_get_size;
 218
 219     /**
 220      * GstVaapiDisplayX11:x11-display:
 221      *
 222      * The X11 #Display that was created by gst_vaapi_display_x11_new()
 223      * or that was bound from gst_vaapi_display_x11_new_with_display().
 224      */
 225     g_object_class_install_property
 226         (object_class,
 227          PROP_X11_DISPLAY,
 228          g_param_spec_pointer("x11-display",
 229                               "X11 display",
 230                               "X11 display",
 231                               G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY));
 232
 233     /**
 234      * GstVaapiDisplayX11:display-name:
 235      *
 236      * The X11 display name.
 237      */
 238     g_object_class_install_property
 239         (object_class,
 240          PROP_DISPLAY_NAME,
 241          g_param_spec_string("display-name",
 242                              "X11 display name",
 243                              "X11 display name",
 244                              NULL,
 245                              G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY));
 246 }
 247
 248 static void
 249 gst_vaapi_display_x11_init(GstVaapiDisplayX11 *display)
 250 {
 251     GstVaapiDisplayX11Private *priv = GST_VAAPI_DISPLAY_X11_GET_PRIVATE(display);
 252
 253     display->priv        = priv;
 254     priv->create_display = TRUE;
 255     priv->x11_display    = NULL;
 256     priv->x11_screen     = 0;
 257     priv->display_name   = NULL;
 258 }
 259
 260 /**
 261  * gst_vaapi_display_x11_new:
 262  * @display_name: the X11 display name
 263  *
 264  * Opens an X11 #Display using @display_name and returns a newly
 265  * allocated #GstVaapiDisplay object. The X11 display will be cloed
 266  * when the reference count of the object reaches zero.
 267  *
 268  * Return value: a newly allocated #GstVaapiDisplay object
 269  */
 270 GstVaapiDisplay *
 271 gst_vaapi_display_x11_new(const gchar *display_name)
 272 {
 273     return g_object_new(GST_VAAPI_TYPE_DISPLAY_X11,
 274                         "display-name", display_name,
 275                         NULL);
 276 }
 277
 278 /**
 279  * gst_vaapi_display_x11_new_with_display:
 280  * @x11_display: an X11 #Display
 281  *
 282  * Creates a #GstVaapiDisplay based on the X11 @x11_display
 283  * display. The caller still owns the display and must call
 284  * XCloseDisplay() when all #GstVaapiDisplay references are
 285  * released. Doing so too early can yield undefined behaviour.
 286  *
 287  * Return value: a newly allocated #GstVaapiDisplay object
 288  */
 289 GstVaapiDisplay *
 290 gst_vaapi_display_x11_new_with_display(Display *x11_display)
 291 {
 292     return g_object_new(GST_VAAPI_TYPE_DISPLAY_X11,
 293                         "x11-display", x11_display,
 294                         NULL);
 295 }
 296
 297 /**
 298  * gst_vaapi_display_x11_get_display:
 299  * @display: a #GstVaapiDisplayX11
 300  *
 301  * Returns the underlying X11 #Display that was created by
 302  * gst_vaapi_display_x11_new() or that was bound from
 303  * gst_vaapi_display_x11_new_with_display().
 304  *
 305  * Return value: the X11 #Display attached to @display
 306  */
 307 Display *
 308 gst_vaapi_display_x11_get_display(GstVaapiDisplayX11 *display)
 309 {
 310     g_return_val_if_fail(GST_VAAPI_IS_DISPLAY_X11(display), NULL);
 311
 312     return display->priv->x11_display;
 313 }