docs/plugins/html/gst-plugins-good-plugins-cairooverlay.html

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  24 <a href="#gst-plugins-good-plugins-cairooverlay.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gst-plugins-good-plugins-cairooverlay.description" class="shortcut">Description</a>
  27                    |
  28                   <a href="#gst-plugins-good-plugins-cairooverlay.object-hierarchy" class="shortcut">Object Hierarchy</a>
  29                    |
  30                   <a href="#gst-plugins-good-plugins-cairooverlay.signals" class="shortcut">Signals</a>
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  33 <div class="refentry">
  34 <a name="gst-plugins-good-plugins-cairooverlay"></a><div class="titlepage"></div>
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  36 <td valign="top">
  37 <h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-cairooverlay.top_of_page"></a>cairooverlay</span></h2>
  38 <p>cairooverlay — Render overlay on a video stream using Cairo</p>
  39 </td>
  40 <td valign="top" align="right"></td>
  41 </tr></table></div>
  42 <div class="refsynopsisdiv">
  43 <a name="gst-plugins-good-plugins-cairooverlay.synopsis"></a><h2>Synopsis</h2>
  44 <a name="GstCairoOverlay"></a><pre class="synopsis">struct              <a class="link" href="gst-plugins-good-plugins-cairooverlay.html#GstCairoOverlay-struct" title="struct GstCairoOverlay">GstCairoOverlay</a>;
  45 </pre>
  46 </div>
  47 <div class="refsect1">
  48 <a name="gst-plugins-good-plugins-cairooverlay.object-hierarchy"></a><h2>Object Hierarchy</h2>
  49 <pre class="synopsis">
  50   <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
  51    +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
  52          +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
  53                +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseTransform.html">GstBaseTransform</a>
  54                      +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideofilter.html#GstVideoFilter">GstVideoFilter</a>
  55                            +----GstCairoOverlay
  56 </pre>
  57 </div>
  58 <div class="refsect1">
  59 <a name="gst-plugins-good-plugins-cairooverlay.signals"></a><h2>Signals</h2>
  60 <pre class="synopsis">
  61   "<a class="link" href="gst-plugins-good-plugins-cairooverlay.html#GstCairoOverlay-caps-changed" title='The "caps-changed" signal'>caps-changed</a>"
  62   "<a class="link" href="gst-plugins-good-plugins-cairooverlay.html#GstCairoOverlay-draw" title='The "draw" signal'>draw</a>"
  63 </pre>
  64 </div>
  65 <div class="refsect1">
  66 <a name="gst-plugins-good-plugins-cairooverlay.description"></a><h2>Description</h2>
  67 <p>
  68 cairooverlay renders an overlay using a application provided render function.
  69 </p>
  70 <p>
  71 The full example can be found in tests/examples/cairo/cairo_overlay.c
  72 </p>
  73 <div class="refsect2">
  74 <a name="idp9630640"></a><h3>Example code</h3>
  75 <div class="informalexample">
  76   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
  77     <tbody>
  78       <tr>
  79         <td class="listing_lines" align="right"><pre>1
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 132 54</pre></td>
 133         <td class="listing_code"><pre class="programlisting"><span class="gtkdoc ppc">#include &lt;gst/gst.h&gt;</span>
 134 <span class="gtkdoc ppc">#include &lt;gst/video/video.h&gt;</span>
 135
 136 <span class="gtkdoc opt">...</span>
 137
 138 <span class="gtkdoc kwc">typedef</span> <span class="gtkdoc kwb">struct</span> <span class="gtkdoc opt">{</span>
 139   gboolean valid<span class="gtkdoc opt">;</span>
 140   <span class="gtkdoc kwb">int</span> width<span class="gtkdoc opt">;</span>
 141   <span class="gtkdoc kwb">int</span> height<span class="gtkdoc opt">;</span>
 142 <span class="gtkdoc opt">}</span> CairoOverlayState<span class="gtkdoc opt">;</span>
 143
 144 <span class="gtkdoc opt">...</span>
 145
 146 <span class="gtkdoc kwb">static void</span>
 147 <span class="function">prepare_overlay</span> <span class="gtkdoc opt">(</span>GstElement <span class="gtkdoc opt">*</span> overlay<span class="gtkdoc opt">,</span> GstCaps <span class="gtkdoc opt">*</span> caps<span class="gtkdoc opt">,</span> gpointer user_data<span class="gtkdoc opt">)</span>
 148 <span class="gtkdoc opt">{</span>
 149   CairoOverlayState <span class="gtkdoc opt">*</span>state <span class="gtkdoc opt">= (</span>CairoOverlayState <span class="gtkdoc opt">*)</span>user_data<span class="gtkdoc opt">;</span>
 150
 151   <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideo.html#gst-video-format-parse-caps">gst_video_format_parse_caps</a></span> <span class="gtkdoc opt">(</span>caps<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">, &amp;</span>state<span class="gtkdoc opt">-&gt;</span>width<span class="gtkdoc opt">, &amp;</span>state<span class="gtkdoc opt">-&gt;</span>height<span class="gtkdoc opt">);</span>
 152   state<span class="gtkdoc opt">-&gt;</span>valid <span class="gtkdoc opt">=</span> TRUE<span class="gtkdoc opt">;</span>
 153 <span class="gtkdoc opt">}</span>
 154
 155 <span class="gtkdoc kwb">static void</span>
 156 <span class="function">draw_overlay</span> <span class="gtkdoc opt">(</span>GstElement <span class="gtkdoc opt">*</span> overlay<span class="gtkdoc opt">,</span> cairo_t <span class="gtkdoc opt">*</span> cr<span class="gtkdoc opt">,</span> guint64 timestamp<span class="gtkdoc opt">,</span>
 157   guint64 duration<span class="gtkdoc opt">,</span> gpointer user_data<span class="gtkdoc opt">)</span>
 158 <span class="gtkdoc opt">{</span>
 159   CairoOverlayState <span class="gtkdoc opt">*</span>s <span class="gtkdoc opt">= (</span>CairoOverlayState <span class="gtkdoc opt">*)</span>user_data<span class="gtkdoc opt">;</span>
 160   <span class="gtkdoc kwb">double</span> scale<span class="gtkdoc opt">;</span>
 161
 162   <span class="keyword">if</span> <span class="gtkdoc opt">(!</span>s<span class="gtkdoc opt">-&gt;</span>valid<span class="gtkdoc opt">)</span>
 163     <span class="keyword">return</span><span class="gtkdoc opt">;</span>
 164
 165   scale <span class="gtkdoc opt">=</span> <span class="number">2</span><span class="gtkdoc opt">*(((</span>timestamp<span class="gtkdoc opt">/(</span><span class="gtkdoc kwb">int</span><span class="gtkdoc opt">)</span><span class="number">1</span>e7<span class="gtkdoc opt">) %</span> <span class="number">70</span><span class="gtkdoc opt">)+</span><span class="number">30</span><span class="gtkdoc opt">)/</span><span class="number">100.0</span><span class="gtkdoc opt">;</span>
 166   <span class="function">cairo_translate</span><span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> s<span class="gtkdoc opt">-&gt;</span>width<span class="gtkdoc opt">/</span><span class="number">2</span><span class="gtkdoc opt">, (</span>s<span class="gtkdoc opt">-&gt;</span>height<span class="gtkdoc opt">/</span><span class="number">2</span><span class="gtkdoc opt">)-</span><span class="number">30</span><span class="gtkdoc opt">);</span>
 167   <span class="function">cairo_scale</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> scale<span class="gtkdoc opt">,</span> scale<span class="gtkdoc opt">);</span>
 168
 169   <span class="function">cairo_move_to</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">);</span>
 170   <span class="function">cairo_curve_to</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,-</span><span class="number">30</span><span class="gtkdoc opt">, -</span><span class="number">50</span><span class="gtkdoc opt">,-</span><span class="number">30</span><span class="gtkdoc opt">, -</span><span class="number">50</span><span class="gtkdoc opt">,</span><span class="number">0</span><span class="gtkdoc opt">);</span>
 171   <span class="function">cairo_curve_to</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">, -</span><span class="number">50</span><span class="gtkdoc opt">,</span><span class="number">30</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span><span class="number">35</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span><span class="number">60</span> <span class="gtkdoc opt">);</span>
 172   <span class="function">cairo_curve_to</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span><span class="number">35</span><span class="gtkdoc opt">,</span> <span class="number">50</span><span class="gtkdoc opt">,</span><span class="number">30</span><span class="gtkdoc opt">,</span> <span class="number">50</span><span class="gtkdoc opt">,</span><span class="number">0</span> <span class="gtkdoc opt">); *</span>
 173   <span class="function">cairo_curve_to</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> <span class="number">50</span><span class="gtkdoc opt">,-</span><span class="number">30</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,-</span><span class="number">30</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span><span class="number">0</span> <span class="gtkdoc opt">);</span>
 174   <span class="function">cairo_set_source_rgba</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">,</span> <span class="number">0.9</span><span class="gtkdoc opt">,</span> <span class="number">0.0</span><span class="gtkdoc opt">,</span> <span class="number">0.1</span><span class="gtkdoc opt">,</span> <span class="number">0.7</span><span class="gtkdoc opt">);</span>
 175   <span class="function">cairo_fill</span> <span class="gtkdoc opt">(</span>cr<span class="gtkdoc opt">);</span>
 176 <span class="gtkdoc opt">}</span>
 177
 178 <span class="gtkdoc opt">...</span>
 179
 180 cairo_overlay <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElementFactory.html#gst-element-factory-make">gst_element_factory_make</a></span> <span class="gtkdoc opt">(</span><span class="string">&quot;cairooverlay&quot;</span><span class="gtkdoc opt">,</span> <span class="string">&quot;overlay&quot;</span><span class="gtkdoc opt">);</span>
 181
 182 <span class="function"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#g-signal-connect">g_signal_connect</a></span> <span class="gtkdoc opt">(</span>cairo_overlay<span class="gtkdoc opt">,</span> <span class="string">&quot;draw&quot;</span><span class="gtkdoc opt">,</span> <span class="function"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>draw_overlay<span class="gtkdoc opt">),</span>
 183   overlay_state<span class="gtkdoc opt">);</span>
 184 <span class="function"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#g-signal-connect">g_signal_connect</a></span> <span class="gtkdoc opt">(</span>cairo_overlay<span class="gtkdoc opt">,</span> <span class="string">&quot;caps-changed&quot;</span><span class="gtkdoc opt">,</span>
 185   <span class="function"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>prepare_overlay<span class="gtkdoc opt">),</span> overlay_state<span class="gtkdoc opt">);</span>
 186 <span class="gtkdoc opt">...</span></pre></td>
 187       </tr>
 188     </tbody>
 189   </table>
 190 </div>
 191
 192 </div>
 193 <p>
 194 </p>
 195 <div class="refsynopsisdiv">
 196 <h2>Synopsis</h2>
 197 <div class="refsect2">
 198 <a name="idp5456288"></a><h3>Element Information</h3>
 199 <div class="variablelist"><table border="0">
 200 <col align="left" valign="top">
 201 <tbody>
 202 <tr>
 203 <td><p><span class="term">plugin</span></p></td>
 204 <td>
 205             <a class="link" href="gst-plugins-good-plugins-plugin-cairo.html#plugin-cairo">cairo</a>
 206           </td>
 207 </tr>
 208 <tr>
 209 <td><p><span class="term">author</span></p></td>
 210 <td>Jon Nordby &lt;jononor@gmail.com&gt;</td>
 211 </tr>
 212 <tr>
 213 <td><p><span class="term">class</span></p></td>
 214 <td>Filter/Editor/Video</td>
 215 </tr>
 216 </tbody>
 217 </table></div>
 218 </div>
 219 <hr>
 220 <div class="refsect2">
 221 <a name="idp5611600"></a><h3>Element Pads</h3>
 222 <div class="variablelist"><table border="0">
 223 <col align="left" valign="top">
 224 <tbody>
 225 <tr>
 226 <td><p><span class="term">name</span></p></td>
 227 <td>sink</td>
 228 </tr>
 229 <tr>
 230 <td><p><span class="term">direction</span></p></td>
 231 <td>sink</td>
 232 </tr>
 233 <tr>
 234 <td><p><span class="term">presence</span></p></td>
 235 <td>always</td>
 236 </tr>
 237 <tr>
 238 <td><p><span class="term">details</span></p></td>
 239 <td>video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 240 </tr>
 241 <tr>
 242 <td><p><span class="term"></span></p></td>
 243 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, alpha_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 244 </tr>
 245 </tbody>
 246 </table></div>
 247 <div class="variablelist"><table border="0">
 248 <col align="left" valign="top">
 249 <tbody>
 250 <tr>
 251 <td><p><span class="term">name</span></p></td>
 252 <td>src</td>
 253 </tr>
 254 <tr>
 255 <td><p><span class="term">direction</span></p></td>
 256 <td>source</td>
 257 </tr>
 258 <tr>
 259 <td><p><span class="term">presence</span></p></td>
 260 <td>always</td>
 261 </tr>
 262 <tr>
 263 <td><p><span class="term">details</span></p></td>
 264 <td>video/x-raw-rgb, bpp=(int)32, depth=(int)24, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 265 </tr>
 266 <tr>
 267 <td><p><span class="term"></span></p></td>
 268 <td> video/x-raw-rgb, bpp=(int)32, depth=(int)32, endianness=(int)4321, red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216, alpha_mask=(int)255, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
 269 </tr>
 270 </tbody>
 271 </table></div>
 272 </div>
 273 </div>
 274 <p>
 275 </p>
 276 </div>
 277 <div class="refsect1">
 278 <a name="gst-plugins-good-plugins-cairooverlay.details"></a><h2>Details</h2>
 279 <div class="refsect2">
 280 <a name="GstCairoOverlay-struct"></a><h3>struct GstCairoOverlay</h3>
 281 <pre class="programlisting">struct GstCairoOverlay;</pre>
 282 <p>
 283 </p>
 284 </div>
 285 </div>
 286 <div class="refsect1">
 287 <a name="gst-plugins-good-plugins-cairooverlay.signal-details"></a><h2>Signal Details</h2>
 288 <div class="refsect2">
 289 <a name="GstCairoOverlay-caps-changed"></a><h3>The <code class="literal">"caps-changed"</code> signal</h3>
 290 <pre class="programlisting"><span class="returnvalue">void</span>                user_function                      (<a class="link" href="gst-plugins-good-plugins-cairooverlay.html#GstCairoOverlay"><span class="type">GstCairoOverlay</span></a> *overlay,
 291                                                         <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a>         *caps,
 292                                                         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>         user_data)</pre>
 293 <p>
 294 This signal is emitted when the caps of the element has changed.
 295 </p>
 296 <div class="variablelist"><table border="0">
 297 <col align="left" valign="top">
 298 <tbody>
 299 <tr>
 300 <td><p><span class="term"><em class="parameter"><code>overlay</code></em> :</span></p></td>
 301 <td>Overlay element emitting the signal.</td>
 302 </tr>
 303 <tr>
 304 <td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
 305 <td>The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> of the element.</td>
 306 </tr>
 307 <tr>
 308 <td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
 309 <td>user data set when the signal handler was connected.</td>
 310 </tr>
 311 </tbody>
 312 </table></div>
 313 </div>
 314 <hr>
 315 <div class="refsect2">
 316 <a name="GstCairoOverlay-draw"></a><h3>The <code class="literal">"draw"</code> signal</h3>
 317 <pre class="programlisting"><span class="returnvalue">void</span>                user_function                      (<a class="link" href="gst-plugins-good-plugins-cairooverlay.html#GstCairoOverlay"><span class="type">GstCairoOverlay</span></a> *overlay,
 318                                                         <span class="type">CairoContext</span>    *cr,
 319                                                         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>          timestamp,
 320                                                         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>          duration,
 321                                                         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>         user_data)</pre>
 322 <p>
 323 This signal is emitted when the overlay should be drawn.
 324 </p>
 325 <div class="variablelist"><table border="0">
 326 <col align="left" valign="top">
 327 <tbody>
 328 <tr>
 329 <td><p><span class="term"><em class="parameter"><code>overlay</code></em> :</span></p></td>
 330 <td>Overlay element emitting the signal.</td>
 331 </tr>
 332 <tr>
 333 <td><p><span class="term"><em class="parameter"><code>cr</code></em> :</span></p></td>
 334 <td>Cairo context to draw to.</td>
 335 </tr>
 336 <tr>
 337 <td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
 338 <td>Timestamp (see <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>) of the current buffer.</td>
 339 </tr>
 340 <tr>
 341 <td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
 342 <td>Duration (see <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>) of the current buffer.</td>
 343 </tr>
 344 <tr>
 345 <td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
 346 <td>user data set when the signal handler was connected.</td>
 347 </tr>
 348 </tbody>
 349 </table></div>
 350 </div>
 351 </div>
 352 </div>
 353 <div class="footer">
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