wearable/docs/gst/html/GstSystemClock.html

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  24 <a href="#GstSystemClock.synopsis" class="shortcut">Top</a>
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  26                   <a href="#GstSystemClock.description" class="shortcut">Description</a>
  27                    |
  28                   <a href="#GstSystemClock.object-hierarchy" class="shortcut">Object Hierarchy</a>
  29                    |
  30                   <a href="#GstSystemClock.properties" class="shortcut">Properties</a>
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  37 <h2><span class="refentrytitle"><a name="GstSystemClock.top_of_page"></a>GstSystemClock</span></h2>
  38 <p>GstSystemClock — Default clock that uses the current system time</p>
  39 </td>
  40 <td valign="top" align="right"></td>
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  42 <div class="refsynopsisdiv">
  43 <a name="GstSystemClock.synopsis"></a><h2>Synopsis</h2>
  44 <pre class="synopsis">
  45 #include &lt;gst/gst.h&gt;
  46
  47 enum                <a class="link" href="GstSystemClock.html#GstClockType" title="enum GstClockType">GstClockType</a>;
  48 struct              <a class="link" href="GstSystemClock.html#GstSystemClock-struct" title="struct GstSystemClock">GstSystemClock</a>;
  49 <a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> *          <a class="link" href="GstSystemClock.html#gst-system-clock-obtain" title="gst_system_clock_obtain ()">gst_system_clock_obtain</a>             (<em class="parameter"><code><span class="type">void</span></code></em>);
  50 </pre>
  51 </div>
  52 <div class="refsect1">
  53 <a name="GstSystemClock.object-hierarchy"></a><h2>Object Hierarchy</h2>
  54 <pre class="synopsis">
  55   <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
  56    +----<a class="link" href="GstObject.html" title="GstObject">GstObject</a>
  57          +----<a class="link" href="GstClock.html" title="GstClock">GstClock</a>
  58                +----GstSystemClock
  59 </pre>
  60 </div>
  61 <div class="refsect1">
  62 <a name="GstSystemClock.properties"></a><h2>Properties</h2>
  63 <pre class="synopsis">
  64   "<a class="link" href="GstSystemClock.html#GstSystemClock--clock-type" title='The "clock-type" property'>clock-type</a>"               <a class="link" href="GstSystemClock.html#GstClockType" title="enum GstClockType"><span class="type">GstClockType</span></a>          : Read / Write
  65 </pre>
  66 </div>
  67 <div class="refsect1">
  68 <a name="GstSystemClock.description"></a><h2>Description</h2>
  69 <p>
  70 The GStreamer core provides a GstSystemClock based on the system time.
  71 Asynchronous callbacks are scheduled from an internal thread.
  72 </p>
  73 <p>
  74 Clock implementors are encouraged to subclass this systemclock as it
  75 implements the async notification.
  76 </p>
  77 <p>
  78 Subclasses can however override all of the important methods for sync and
  79 async notifications to implement their own callback methods or blocking
  80 wait operations.
  81 </p>
  82 <p>
  83 Last reviewed on 2006-03-08 (0.10.4)
  84 </p>
  85 </div>
  86 <div class="refsect1">
  87 <a name="GstSystemClock.details"></a><h2>Details</h2>
  88 <div class="refsect2">
  89 <a name="GstClockType"></a><h3>enum GstClockType</h3>
  90 <pre class="programlisting">typedef enum {
  91   GST_CLOCK_TYPE_REALTIME       = 0,
  92   GST_CLOCK_TYPE_MONOTONIC      = 1
  93 } GstClockType;
  94 </pre>
  95 <p>
  96 The different kind of clocks.
  97 </p>
  98 <div class="variablelist"><table border="0">
  99 <col align="left" valign="top">
 100 <tbody>
 101 <tr>
 102 <td><p><a name="GST-CLOCK-TYPE-REALTIME:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_TYPE_REALTIME</code></span></p></td>
 103 <td>time since Epoch
 104 </td>
 105 </tr>
 106 <tr>
 107 <td><p><a name="GST-CLOCK-TYPE-MONOTONIC:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_TYPE_MONOTONIC</code></span></p></td>
 108 <td>monotonic time since some unspecified starting
 109                            point
 110 </td>
 111 </tr>
 112 </tbody>
 113 </table></div>
 114 </div>
 115 <hr>
 116 <div class="refsect2">
 117 <a name="GstSystemClock-struct"></a><h3>struct GstSystemClock</h3>
 118 <pre class="programlisting">struct GstSystemClock;</pre>
 119 <p>
 120 The default implementation of a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> that uses the system time.
 121 </p>
 122 </div>
 123 <hr>
 124 <div class="refsect2">
 125 <a name="gst-system-clock-obtain"></a><h3>gst_system_clock_obtain ()</h3>
 126 <pre class="programlisting"><a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> *          gst_system_clock_obtain             (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 127 <p>
 128 Get a handle to the default system clock. The refcount of the
 129 clock will be increased so you need to unref the clock after
 130 usage.
 131 </p>
 132 <div class="variablelist"><table border="0">
 133 <col align="left" valign="top">
 134 <tbody><tr>
 135 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 136 <td>the default clock.
 137 MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
 138 </td>
 139 </tr></tbody>
 140 </table></div>
 141 </div>
 142 </div>
 143 <div class="refsect1">
 144 <a name="GstSystemClock.property-details"></a><h2>Property Details</h2>
 145 <div class="refsect2">
 146 <a name="GstSystemClock--clock-type"></a><h3>The <code class="literal">"clock-type"</code> property</h3>
 147 <pre class="programlisting">  "clock-type"               <a class="link" href="GstSystemClock.html#GstClockType" title="enum GstClockType"><span class="type">GstClockType</span></a>          : Read / Write</pre>
 148 <p>The type of underlying clock implementation used.</p>
 149 <p>Default value: GST_CLOCK_TYPE_MONOTONIC</p>
 150 </div>
 151 </div>
 152 <div class="refsect1">
 153 <a name="GstSystemClock.see-also"></a><h2>See Also</h2>
 154 <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
 155 </div>
 156 </div>
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