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<h1>Gst::Clock Class Reference</h1><!-- doxytag: class="Gst::Clock" --><!-- doxytag: inherits="Gst::Object" -->
<p><a class="el" href="classGst_1_1Clock.html" title="Gst::Clock - Abstract class for global clocks.">Gst::Clock</a> - Abstract class for global clocks. <a href="#_details">More...</a></p>
<p>Inherits <a class="el" href="classGst_1_1Object.html">Gst::Object</a>.</p>
<p>Inherited by <a class="el" href="classGst_1_1SystemClock.html">Gst::SystemClock</a>.</p>
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Collaboration diagram for Gst::Clock:</div>
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<p><a href="classGst_1_1Clock-members.html">List of all members.</a></p>
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<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#aef8701c69f8100fcb0bdffae56670c9a">~Clock</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">GstClock* </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#aa0459a0384c1e5432b82764c7810f05d">gobj</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Provides access to the underlying C GObject. <a href="#aa0459a0384c1e5432b82764c7810f05d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const GstClock* </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a90c51fa0237633716c4fc102d4b26580">gobj</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Provides access to the underlying C GObject. <a href="#a90c51fa0237633716c4fc102d4b26580"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">GstClock* </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#ae7273dacc028b733d43ebc92b4f2e6bb">gobj_copy</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. <a href="#ae7273dacc028b733d43ebc92b4f2e6bb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a976709e5c0e433bcca96244b5e7c4c5f">add_observation</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> slave_time, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> master_time, gdouble* result)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The time <em>master</em> of the master clock and the time <em>slave</em> of the slave clock are added to the list of observations. <a href="#a976709e5c0e433bcca96244b5e7c4c5f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#ab85ebe6e289302d83738ccd55bbfe4b6">set_master</a> (const <a class="el" href="classGst_1_1Clock.html">Clock</a>& master_clock)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set <em>master</em> as the master clock for <em>clock</em>. <a href="#ab85ebe6e289302d83738ccd55bbfe4b6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1Clock.html">Gst::Clock</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a305be78c4fdd5050463eb636feeb4c4c">get_master</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the master clock that <em>clock</em> is slaved to or <code>0</code> when the clock is not slaved to any master clock. <a href="#a305be78c4fdd5050463eb636feeb4c4c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< const <a class="el" href="classGst_1_1Clock.html">Gst::Clock</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#ad27ac8a85bfe4b511f8c3043f8ccc093">get_master</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the master clock that <em>clock</em> is slaved to or <code>0</code> when the clock is not slaved to any master clock. <a href="#ad27ac8a85bfe4b511f8c3043f8ccc093"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a4065f6be90f6094bc28b3c33e76426b0">set_resolution</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> resolution)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the accuracy of the clock. <a href="#a4065f6be90f6094bc28b3c33e76426b0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a4453f769efdcc530c1973b713cdeec7e">get_resolution</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the accuracy of the clock. <a href="#a4453f769efdcc530c1973b713cdeec7e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8">get_time</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Gets the current time of the given clock. <a href="#a3d1aad1aa1d4f133305df55834b850e8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a6bde543425d75bb5b34d942d0a9babcb">create_single_shot_id</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> time)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get a <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> from <em>clock</em> to trigger a single shot notification at the requested time. <a href="#a6bde543425d75bb5b34d942d0a9babcb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a8fca82c5689e727a9c07601919fac477">create_periodic_id</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> start_time, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> intervals)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get an ID from <em>clock</em> to trigger a periodic notification. <a href="#a8fca82c5689e727a9c07601919fac477"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a06806bcb81dc4ff61e72bd46688abac0">get_internal_time</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Gets the current internal time of the given clock. <a href="#a06806bcb81dc4ff61e72bd46688abac0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a8d88e4d06dbe5fe927e66153e0a9f94a">adjust_unlocked</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> internal_time)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Converts the given <em>internal</em> clock time to the external time, adjusting for the rate and reference time set with <a class="el" href="classGst_1_1Clock.html#a37239c4270eb45fabcf314d8f6fae38c" title="Adjusts the rate and time of clock.">set_calibration()</a> and making sure that the returned time is increasing. <a href="#a8d88e4d06dbe5fe927e66153e0a9f94a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a6f95e56ca1947b252cc4062f6d0cca2a">unadjust_unlocked</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> external_time)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Converts the given <em>external</em> clock time to the internal time of <em>clock</em>, using the rate and reference time set with <a class="el" href="classGst_1_1Clock.html#a37239c4270eb45fabcf314d8f6fae38c" title="Adjusts the rate and time of clock.">set_calibration()</a>. <a href="#a6f95e56ca1947b252cc4062f6d0cca2a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#aae30ba7850d810cc448eb47c98433060">get_calibration</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a>& internal, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a>& external, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a>& rate_num, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a>& rate_denom) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Gets the internal rate and reference time of <em>clock</em>. <a href="#aae30ba7850d810cc448eb47c98433060"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a37239c4270eb45fabcf314d8f6fae38c">set_calibration</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> internal, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> external, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> rate_num, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> rate_denom)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adjusts the rate and time of <em>clock</em>. <a href="#a37239c4270eb45fabcf314d8f6fae38c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a>< bool > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a6b2394098901d898a367edd52f0f6882">property_stats</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Enable clock stats (unimplemented). <a href="#a6b2394098901d898a367edd52f0f6882"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a><br class="typebreak"/>
< bool > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#ac663a3ac6a7c9e1cfb6505c873e63137">property_stats</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Enable clock stats (unimplemented). <a href="#ac663a3ac6a7c9e1cfb6505c873e63137"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a>< guint64 > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a9d63fa08e7ff845bc4bcbe8343559f66">property_timeout</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The amount of time. <a href="#a9d63fa08e7ff845bc4bcbe8343559f66"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a><br class="typebreak"/>
< guint64 > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a816a79a1e5bc9fb068b19809a8d9fd7b">property_timeout</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The amount of time. <a href="#a816a79a1e5bc9fb068b19809a8d9fd7b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a>< int > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a8fa25838fb846cdbc701ec65306bce75">property_window_size</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The size of the window used to calculate rate and offset. <a href="#a8fa25838fb846cdbc701ec65306bce75"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a>< int > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a569dd59e5a40005cb3cfa80d21641591">property_window_size</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The size of the window used to calculate rate and offset. <a href="#a569dd59e5a40005cb3cfa80d21641591"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a>< int > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#ab0eddb3a8d1d8f75e0e2b01f3ab6583c">property_window_threshold</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The threshold to start calculating rate and offset. <a href="#ab0eddb3a8d1d8f75e0e2b01f3ab6583c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a>< int > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a9c052bac23399b3aee3baa6eeeb54163">property_window_threshold</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The threshold to start calculating rate and offset. <a href="#a9c052bac23399b3aee3baa6eeeb54163"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a9b5c90b1bb12359228d351ebb26859f9">change_resolution_vfunc</a> (<a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> old_resolution, <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> new_resolution)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Change the resolution of the clock. <a href="#a9b5c90b1bb12359228d351ebb26859f9"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a0fd542000b201b32a1327c21043e8795">get_resolution_vfunc</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the resolution of the clock. <a href="#a0fd542000b201b32a1327c21043e8795"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#abb9eef28190a1dd472ea0354726c3ac8">get_internal_time_vfunc</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the internal unadjusted time of the clock. <a href="#abb9eef28190a1dd472ea0354726c3ac8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="group__gstreamermmEnums.html#gaa501f23d690de389e755e652093d9392">ClockReturn</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#ac4849919f892fe8a6bce450649e5ff65">wait_vfunc</a> (const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Perform a blocking wait for the given <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a>. <a href="#ac4849919f892fe8a6bce450649e5ff65"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="group__gstreamermmEnums.html#gaa501f23d690de389e755e652093d9392">ClockReturn</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#ae5f4d706cab453f51c822f2abf4bde12">wait_async_vfunc</a> (const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Perform an asynchronous wait for the given <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a>. <a href="#ae5f4d706cab453f51c822f2abf4bde12"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#abc41eb372e0f7b1ad9071f53ba668eeb">unschedule_vfunc</a> (const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Unblock a blocking or async wait operation. <a href="#abc41eb372e0f7b1ad9071f53ba668eeb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="group__gstreamermmEnums.html#gaa501f23d690de389e755e652093d9392">ClockReturn</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#a288154df1dd7b163a3ce53603bd327bd">wait_jitter_vfunc</a> (const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& id, <a class="el" href="namespaceGst.html#a1bd878eb666682156ef268a6ff0ad16c">ClockTimeDiff</a>& jitter)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Perform a blocking wait on the given <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> and return the jitter. <a href="#a288154df1dd7b163a3ce53603bd327bd"></a><br/></td></tr>
<tr><td colspan="2"><h2>Related Functions</h2></td></tr>
<tr><td colspan="2"><p>(Note that these are not member functions.) </p>
<br/><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1Clock.html">Gst::Clock</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGst_1_1Clock.html#aa055df9465a22ca8144c637617a3fea9">wrap</a> (GstClock* object, bool take_copy=false)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A <a class="elRef" href="../../../glibmm-2.4/reference/html/namespaceGlib.html#a671306f4a3a0cae5ab4d7a9d54886592">Glib::wrap()</a> method for this object. <a href="#aa055df9465a22ca8144c637617a3fea9"></a><br/></td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p><a class="el" href="classGst_1_1Clock.html" title="Gst::Clock - Abstract class for global clocks.">Gst::Clock</a> - Abstract class for global clocks. </p>
<p>GStreamer uses a global clock to synchronize the plugins in a pipeline. Different clock implementations are possible by implementing this abstract base class.</p>
<p>The <a class="el" href="classGst_1_1Clock.html" title="Gst::Clock - Abstract class for global clocks.">Gst::Clock</a> returns a monotonically increasing time with the method <a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8" title="Gets the current time of the given clock.">get_time()</a>. Its accuracy and base time depend on the specific clock implementation but time is always expressed in nanoseconds. Since the baseline of the clock is undefined, the clock time returned is not meaningful in itself, what matters are the deltas between two clock times. The time returned by a clock is called the absolute time.</p>
<p>The pipeline uses the clock to calculate the stream time. Usually all renderers synchronize to the global clock using the buffer timestamps, the newsegment events and the element's base time, see <a class="el" href="classGst_1_1Pipeline.html" title="A Gst::Pipeline is a special Gst::Bin used as the toplevel container for the filter...">Gst::Pipeline</a>.</p>
<p>A clock implementation can support periodic and single shot clock notifications both synchronous and asynchronous.</p>
<p>One first needs to create a <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> for the periodic or single shot notification using <a class="el" href="classGst_1_1Clock.html#a6bde543425d75bb5b34d942d0a9babcb" title="Get a Gst::ClockID from clock to trigger a single shot notification at the requested...">create_single_shot_id()</a> or <a class="el" href="classGst_1_1Clock.html#a8fca82c5689e727a9c07601919fac477" title="Get an ID from clock to trigger a periodic notification.">create_periodic_id()</a>.</p>
<p>To perform a blocking wait for the specific time of the <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> use the <a class="el" href="classGst_1_1ClockID.html#ad11cfa71447a9365364ee3e63b3bcd4b" title="Perform a blocking wait without requiring a jitter argument.">Gst::ClockID::wait()</a> method. To receive a callback when the specific time is reached in the clock use <a class="el" href="classGst_1_1ClockID.html#a05351f52919ad9a36743f59848e74c28" title="Register a slot on the given Gst::ClockID id with the given slot.">Gst::ClockID::wait_async()</a>. Both these calls can be interrupted with the <a class="el" href="classGst_1_1ClockID.html#aac9b66d4c3632a5f2c7bc3a1975cfded" title="Cancel an outstanding request with id.">Gst::ClockID::unschedule()</a> call. If the blocking wait is unscheduled a return value of <a class="el" href="group__gstreamermmEnums.html#ggaa501f23d690de389e755e652093d9392a26d9d6d6ec4f3d95e7520eab14114a1d">Gst::CLOCK_UNSCHEDULED</a> is returned.</p>
<p>Periodic callbacks scheduled async will be repeadedly called automatically until it is unscheduled. To schedule a sync periodic callback, <a class="el" href="classGst_1_1ClockID.html#ad11cfa71447a9365364ee3e63b3bcd4b" title="Perform a blocking wait without requiring a jitter argument.">Gst::ClockID::wait()</a> should be called repeadedly.</p>
<p>The async callbacks can happen from any thread, either provided by the core or from a streaming thread. The application should be prepared for this.</p>
<p>A <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> that has been unscheduled cannot be used again for any wait operation, a new <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> should be created.</p>
<p>It is possible to perform a blocking wait on the same <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">ClockID</a> from multiple threads. However, registering the same <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">ClockID</a> for multiple async notifications is not possible, the slot will only be called for the thread registering the entry last.</p>
<p>None of the wait operations unref the <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a>, the owner is responsible for unreffing the ids itself. This holds for both periodic and single shot notifications. The reason being that the owner of the <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> has to keep a handle to the <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> to unblock the wait on FLUSHING events or state changes and if the entry would be unreffed automatically, the handle might become invalid without any notification. (The RefPtr takes care of unreffing in this case)</p>
<p>These clock operations do not operate on the stream time, so the callbacks will also occur when not in PLAYING state as if the clock just keeps on running. Some clocks however do not progress when the element that provided the clock is not PLAYING.</p>
<p>When a clock has the <a class="el" href="group__gstreamermmEnums.html#ggae4cd01977bbec7f009fb9725d8cfa080a8b29e12d5de79fe1b9c68c0cafcd42dd">Gst::CLOCK_FLAG_CAN_SET_MASTER</a> flag set, it can be slaved to another <a class="el" href="classGst_1_1Clock.html" title="Gst::Clock - Abstract class for global clocks.">Gst::Clock</a> with the <a class="el" href="classGst_1_1Clock.html#ab85ebe6e289302d83738ccd55bbfe4b6" title="Set master as the master clock for clock.">set_master()</a> method. The clock will then automatically be synchronized to this master clock by repeadedly sampling the master clock and the slave clock and recalibrating the slave clock with <a class="el" href="classGst_1_1Clock.html#a37239c4270eb45fabcf314d8f6fae38c" title="Adjusts the rate and time of clock.">set_calibration()</a>. This feature is mostly useful for plugins that have an internal clock but must operate with another clock selected by the <a class="el" href="classGst_1_1Pipeline.html" title="A Gst::Pipeline is a special Gst::Bin used as the toplevel container for the filter...">Gst::Pipeline</a>. They can track the offset and rate difference of their internal clock relative to the master clock by using the <a class="el" href="classGst_1_1Clock.html#aae30ba7850d810cc448eb47c98433060" title="Gets the internal rate and reference time of clock.">get_calibration()</a> method.</p>
<p>The master/slave synchronisation can be tuned with the "timeout", "window-size" and "window-threshold" properties. The "timeout" property defines the interval to sample the master clock and run the calibration functions. "window-size" defines the number of samples to use when calibrating and "window-threshold" defines the minimum number of samples before the calibration is performed.</p>
<p>Last reviewed on 2006-08-11 (0.10.10) </p>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="aef8701c69f8100fcb0bdffae56670c9a"></a><!-- doxytag: member="Gst::Clock::~Clock" ref="aef8701c69f8100fcb0bdffae56670c9a" args="()" -->
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<td class="memname">virtual Gst::Clock::~Clock </td>
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<td><code> [virtual]</code></td>
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<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a976709e5c0e433bcca96244b5e7c4c5f"></a><!-- doxytag: member="Gst::Clock::add_observation" ref="a976709e5c0e433bcca96244b5e7c4c5f" args="(ClockTime slave_time, ClockTime master_time, gdouble *result)" -->
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<td class="memname">bool Gst::Clock::add_observation </td>
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<td class="paramtype"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td>
<td class="paramname"> <em>slave_time</em>, </td>
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<td class="paramtype"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td>
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<p>The time <em>master</em> of the master clock and the time <em>slave</em> of the slave clock are added to the list of observations. </p>
<p>If enough observations are available, a linear regression algorithm is run on the observations and <em>clock</em> is recalibrated.</p>
<p>If this functions returns <code>true</code>, <em>r_squared</em> will contain the correlation coefficient of the interpolation. A value of 1.0 means a perfect regression was performed. This value can be used to control the sampling frequency of the master and slave clocks. </p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>slave</em> </td><td>A time on the slave. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>master</em> </td><td>A time on the master. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>r_squared</em> </td><td>A pointer to hold the result. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd><code>true</code> if enough observations were added to run the regression algorithm.</dd></dl>
<p>MT safe. </p>
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<a class="anchor" id="a8d88e4d06dbe5fe927e66153e0a9f94a"></a><!-- doxytag: member="Gst::Clock::adjust_unlocked" ref="a8d88e4d06dbe5fe927e66153e0a9f94a" args="(ClockTime internal_time)" -->
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<td class="memname"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::adjust_unlocked </td>
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<p>Converts the given <em>internal</em> clock time to the external time, adjusting for the rate and reference time set with <a class="el" href="classGst_1_1Clock.html#a37239c4270eb45fabcf314d8f6fae38c" title="Adjusts the rate and time of clock.">set_calibration()</a> and making sure that the returned time is increasing. </p>
<p>This function should be called with the clock's OBJECT_LOCK held and is mainly used by clock subclasses.</p>
<p>This function is the reverse of <a class="el" href="classGst_1_1Clock.html#a6f95e56ca1947b252cc4062f6d0cca2a" title="Converts the given external clock time to the internal time of clock, using the rate...">unadjust_unlocked()</a>. </p>
<dl><dt><b>Parameters:</b></dt><dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>The converted time of the clock. </dd></dl>
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<a class="anchor" id="a9b5c90b1bb12359228d351ebb26859f9"></a><!-- doxytag: member="Gst::Clock::change_resolution_vfunc" ref="a9b5c90b1bb12359228d351ebb26859f9" args="(ClockTime old_resolution, ClockTime new_resolution)" -->
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<p>Change the resolution of the clock. </p>
<p>Not all values might be acceptable. The new resolution should be returned. </p>
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<a class="anchor" id="a8fca82c5689e727a9c07601919fac477"></a><!-- doxytag: member="Gst::Clock::create_periodic_id" ref="a8fca82c5689e727a9c07601919fac477" args="(ClockTime start_time, ClockTime intervals)" -->
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a><<a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a>> Gst::Clock::create_periodic_id </td>
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<p>Get an ID from <em>clock</em> to trigger a periodic notification. </p>
<p>The periodic notifications will start at time <em>start_time</em> and will then be fired with the given <em>interval</em>. <em>id</em> should be unreffed after usage. </p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>start_time</em> </td><td>The requested start time. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>interval</em> </td><td>The requested interval. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>A <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> that can be used to request the time notification.</dd></dl>
<p>MT safe. </p>
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<a class="anchor" id="a6bde543425d75bb5b34d942d0a9babcb"></a><!-- doxytag: member="Gst::Clock::create_single_shot_id" ref="a6bde543425d75bb5b34d942d0a9babcb" args="(ClockTime time)" -->
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<p>Get a <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> from <em>clock</em> to trigger a single shot notification at the requested time. </p>
<p>The single shot id should be unreffed after usage. </p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>time</em> </td><td>The requested time. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>A <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> that can be used to request the time notification.</dd></dl>
<p>MT safe. </p>
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<a class="anchor" id="aae30ba7850d810cc448eb47c98433060"></a><!-- doxytag: member="Gst::Clock::get_calibration" ref="aae30ba7850d810cc448eb47c98433060" args="(ClockTime &internal, ClockTime &external, ClockTime &rate_num, ClockTime &rate_denom) const " -->
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<td class="memname">void Gst::Clock::get_calibration </td>
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<p>Gets the internal rate and reference time of <em>clock</em>. </p>
<p>See <a class="el" href="classGst_1_1Clock.html#a37239c4270eb45fabcf314d8f6fae38c" title="Adjusts the rate and time of clock.">set_calibration()</a> for more information.</p>
<p><em>internal</em>, <em>external</em>, <em>rate_num</em>, and <em>rate_denom</em> can be left <code>0</code> if the caller is not interested in the values.</p>
<p>MT safe. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>internal</em> </td><td>A location to store the internal time. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>external</em> </td><td>A location to store the external time. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>rate_num</em> </td><td>A location to store the rate numerator. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>rate_denom</em> </td><td>A location to store the rate denominator. </td></tr>
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<td class="memname"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::get_internal_time </td>
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<p>Gets the current internal time of the given clock. </p>
<p>The time is returned unadjusted for the offset and the rate. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>The internal time of the clock. Or GST_CLOCK_TIME_NONE when given invalid input.</dd></dl>
<p>MT safe. </p>
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<td class="memname">virtual <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::get_internal_time_vfunc </td>
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<p>Get the internal unadjusted time of the clock. </p>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a><const <a class="el" href="classGst_1_1Clock.html">Gst::Clock</a>> Gst::Clock::get_master </td>
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<p>Get the master clock that <em>clock</em> is slaved to or <code>0</code> when the clock is not slaved to any master clock. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A master <a class="el" href="classGst_1_1Clock.html" title="Gst::Clock - Abstract class for global clocks.">Gst::Clock</a> or <code>0</code> when this clock is not slaved to a master clock. Unref after usage.</dd></dl>
<p>MT safe. </p>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a><<a class="el" href="classGst_1_1Clock.html">Gst::Clock</a>> Gst::Clock::get_master </td>
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<p>Get the master clock that <em>clock</em> is slaved to or <code>0</code> when the clock is not slaved to any master clock. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A master <a class="el" href="classGst_1_1Clock.html" title="Gst::Clock - Abstract class for global clocks.">Gst::Clock</a> or <code>0</code> when this clock is not slaved to a master clock. Unref after usage.</dd></dl>
<p>MT safe. </p>
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<td class="memname"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::get_resolution </td>
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<p>Get the accuracy of the clock. </p>
<p>The accuracy of the clock is the granularity of the values returned by <a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8" title="Gets the current time of the given clock.">get_time()</a>. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>The resolution of the clock in units of <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda" title="A datatype to hold a time, measured in nanoseconds.">Gst::ClockTime</a>.</dd></dl>
<p>MT safe. </p>
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<td class="memname">virtual <a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::get_resolution_vfunc </td>
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<p>Get the resolution of the clock. </p>
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<td class="memname"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::get_time </td>
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<p>Gets the current time of the given clock. </p>
<p>The time is always monotonically increasing and adjusted according to the current offset and rate. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>The time of the clock. Or GST_CLOCK_TIME_NONE when given invalid input.</dd></dl>
<p>MT safe. </p>
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<td class="memname">const GstClock* Gst::Clock::gobj </td>
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<p>Provides access to the underlying C GObject. </p>
<p>Reimplemented from <a class="el" href="classGst_1_1Object.html#a11313ecde7bc68ee4ee43c0cf2e65c22">Gst::Object</a>.</p>
<p>Reimplemented in <a class="el" href="classGst_1_1AudioClock.html#a70c595a95a928f472dc8025b64531a2c">Gst::AudioClock</a>, and <a class="el" href="classGst_1_1SystemClock.html#aca0d8cd01b925e7f931dfdfa19caf223">Gst::SystemClock</a>.</p>
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<p>Provides access to the underlying C GObject. </p>
<p>Reimplemented from <a class="el" href="classGst_1_1Object.html#a3d889e949c76aa3ab4490026d6aca8ca">Gst::Object</a>.</p>
<p>Reimplemented in <a class="el" href="classGst_1_1AudioClock.html#a3433b11a621ab898d05c36df2a331ea6">Gst::AudioClock</a>, and <a class="el" href="classGst_1_1SystemClock.html#a3ab62611768fae656296202660905223">Gst::SystemClock</a>.</p>
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<p>Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. </p>
<p>Reimplemented from <a class="el" href="classGst_1_1Object.html#a63d7202d3eb47c81ffc3ac16a895e9d1">Gst::Object</a>.</p>
<p>Reimplemented in <a class="el" href="classGst_1_1AudioClock.html#a89862916e87b4b7bb77c2a3fff64271d">Gst::AudioClock</a>, and <a class="el" href="classGst_1_1SystemClock.html#acfcaad3c7fee0e7e51c98a9d152fe00c">Gst::SystemClock</a>.</p>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a><bool> Gst::Clock::property_stats </td>
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<p>Enable clock stats (unimplemented). </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a><bool> Gst::Clock::property_stats </td>
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<p>Enable clock stats (unimplemented). </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a><guint64> Gst::Clock::property_timeout </td>
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<p>The amount of time. </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a><guint64> Gst::Clock::property_timeout </td>
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<p>The amount of time. </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a><int> Gst::Clock::property_window_size </td>
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<p>The size of the window used to calculate rate and offset. </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a><int> Gst::Clock::property_window_size </td>
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<p>The size of the window used to calculate rate and offset. </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy__ReadOnly.html">Glib::PropertyProxy_ReadOnly</a><int> Gst::Clock::property_window_threshold </td>
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<p>The threshold to start calculating rate and offset. </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1PropertyProxy.html">Glib::PropertyProxy</a><int> Gst::Clock::property_window_threshold </td>
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<p>The threshold to start calculating rate and offset. </p>
<p>You rarely need to use properties because there are get_ and set_ methods for almost all of them. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes. </dd></dl>
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<td class="memname">void Gst::Clock::set_calibration </td>
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<td class="paramtype"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td>
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<p>Adjusts the rate and time of <em>clock</em>. </p>
<p>A rate of 1/1 is the normal speed of the clock. Values bigger than 1/1 make the clock go faster.</p>
<p><em>internal</em> and <em>external</em> are calibration parameters that arrange that <a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8" title="Gets the current time of the given clock.">get_time()</a> should have been <em>external</em> at internal time <em>internal</em>. This internal time should not be in the future; that is, it should be less than the value of <a class="el" href="classGst_1_1Clock.html#a06806bcb81dc4ff61e72bd46688abac0" title="Gets the current internal time of the given clock.">get_internal_time()</a> when this function is called.</p>
<p>Subsequent calls to <a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8" title="Gets the current time of the given clock.">get_time()</a> will return clock times computed as follows:</p>
<p><programlisting> time = (internal_time - internal) * rate_num / rate_denom + external </programlisting></p>
<p>This formula is implemented in <a class="el" href="classGst_1_1Clock.html#a8d88e4d06dbe5fe927e66153e0a9f94a" title="Converts the given internal clock time to the external time, adjusting for the rate...">adjust_unlocked()</a>. Of course, it tries to do the integer arithmetic as precisely as possible.</p>
<p>Note that <a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8" title="Gets the current time of the given clock.">get_time()</a> always returns increasing values so when you move the clock backwards, <a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8" title="Gets the current time of the given clock.">get_time()</a> will report the previous value until the clock catches up.</p>
<p>MT safe. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>internal</em> </td><td>A reference internal time. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>external</em> </td><td>A reference external time. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>rate_num</em> </td><td>The numerator of the rate of the clock relative to its internal time. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>rate_denom</em> </td><td>The denominator of the rate of the clock. </td></tr>
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<td class="memname">bool Gst::Clock::set_master </td>
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<td class="paramtype">const <a class="el" href="classGst_1_1Clock.html">Clock</a>& </td>
<td class="paramname"> <em>master_clock</em></td>
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<p>Set <em>master</em> as the master clock for <em>clock</em>. </p>
<p><em>clock</em> will be automatically calibrated so that <a class="el" href="classGst_1_1Clock.html#a3d1aad1aa1d4f133305df55834b850e8" title="Gets the current time of the given clock.">get_time()</a> reports the same time as the master clock.</p>
<p>A clock provider that slaves its clock to a master can get the current calibration values with <a class="el" href="classGst_1_1Clock.html#aae30ba7850d810cc448eb47c98433060" title="Gets the internal rate and reference time of clock.">get_calibration()</a>.</p>
<p><em>master</em> can be <code>0</code> in which case <em>clock</em> will not be slaved anymore. It will however keep reporting its time adjusted with the last configured rate and time offsets. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>master</em> </td><td>A master <a class="el" href="classGst_1_1Clock.html" title="Gst::Clock - Abstract class for global clocks.">Gst::Clock</a>. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd><code>true</code> if the clock is capable of being slaved to a master clock. Trying to set a master on a clock without the <a class="el" href="group__gstreamermmEnums.html#ggae4cd01977bbec7f009fb9725d8cfa080a8b29e12d5de79fe1b9c68c0cafcd42dd">Gst::CLOCK_FLAG_CAN_SET_MASTER</a> flag will make this function return <code>false</code>.</dd></dl>
<p>MT safe. </p>
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<a class="anchor" id="a4065f6be90f6094bc28b3c33e76426b0"></a><!-- doxytag: member="Gst::Clock::set_resolution" ref="a4065f6be90f6094bc28b3c33e76426b0" args="(ClockTime resolution)" -->
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<td class="memname"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::set_resolution </td>
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<td class="paramtype"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> </td>
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<p>Set the accuracy of the clock. </p>
<p>Some clocks have the possibility to operate with different accuracy at the expense of more resource usage. There is normally no need to change the default resolution of a clock. The resolution of a clock can only be changed if the clock has the <a class="el" href="group__gstreamermmEnums.html#ggae4cd01977bbec7f009fb9725d8cfa080ac88505d09ead5393ee3fe4254dfec6af">Gst::CLOCK_FLAG_CAN_SET_RESOLUTION</a> flag set. </p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>resolution</em> </td><td>The resolution to set. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>The new resolution of the clock. </dd></dl>
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<a class="anchor" id="a6f95e56ca1947b252cc4062f6d0cca2a"></a><!-- doxytag: member="Gst::Clock::unadjust_unlocked" ref="a6f95e56ca1947b252cc4062f6d0cca2a" args="(ClockTime external_time)" -->
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<td class="memname"><a class="el" href="namespaceGst.html#ad35f82b74cae5822fe16b231e8293cda">ClockTime</a> Gst::Clock::unadjust_unlocked </td>
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<p>Converts the given <em>external</em> clock time to the internal time of <em>clock</em>, using the rate and reference time set with <a class="el" href="classGst_1_1Clock.html#a37239c4270eb45fabcf314d8f6fae38c" title="Adjusts the rate and time of clock.">set_calibration()</a>. </p>
<p>This function should be called with the clock's OBJECT_LOCK held and is mainly used by clock subclasses.</p>
<p>This function is the reverse of <a class="el" href="classGst_1_1Clock.html#a8d88e4d06dbe5fe927e66153e0a9f94a" title="Converts the given internal clock time to the external time, adjusting for the rate...">adjust_unlocked()</a>. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>external</em> </td><td>An external clock time. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>The internal time of the clock corresponding to <em>external</em>.</dd></dl>
<dl class="since_0_10"><dt><b><a class="el" href="since_0_10.html#_since_0_10000048">Since gstreamermm 0.10:</a></b></dt><dd>.13. </dd></dl>
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<a class="anchor" id="abc41eb372e0f7b1ad9071f53ba668eeb"></a><!-- doxytag: member="Gst::Clock::unschedule_vfunc" ref="abc41eb372e0f7b1ad9071f53ba668eeb" args="(const Glib::RefPtr< Gst::ClockID > &id)" -->
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<td class="memname">virtual void Gst::Clock::unschedule_vfunc </td>
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<td class="paramtype">const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& </td>
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<td><code> [virtual]</code></td>
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<p>Unblock a blocking or async wait operation. </p>
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<td class="memname">virtual <a class="el" href="group__gstreamermmEnums.html#gaa501f23d690de389e755e652093d9392">ClockReturn</a> Gst::Clock::wait_async_vfunc </td>
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<td class="paramtype">const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& </td>
<td class="paramname"> <em>id</em></td>
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<p>Perform an asynchronous wait for the given <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a>. </p>
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<a class="anchor" id="a288154df1dd7b163a3ce53603bd327bd"></a><!-- doxytag: member="Gst::Clock::wait_jitter_vfunc" ref="a288154df1dd7b163a3ce53603bd327bd" args="(const Glib::RefPtr< Gst::ClockID > &id, ClockTimeDiff &jitter)" -->
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<td class="memname">virtual <a class="el" href="group__gstreamermmEnums.html#gaa501f23d690de389e755e652093d9392">ClockReturn</a> Gst::Clock::wait_jitter_vfunc </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& </td>
<td class="paramname"> <em>id</em>, </td>
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<td class="paramtype"><a class="el" href="namespaceGst.html#a1bd878eb666682156ef268a6ff0ad16c">ClockTimeDiff</a>& </td>
<td class="paramname"> <em>jitter</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [virtual]</code></td>
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<p>Perform a blocking wait on the given <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a> and return the jitter. </p>
<p>(Since: 0.10.10) </p>
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<a class="anchor" id="ac4849919f892fe8a6bce450649e5ff65"></a><!-- doxytag: member="Gst::Clock::wait_vfunc" ref="ac4849919f892fe8a6bce450649e5ff65" args="(const Glib::RefPtr< Gst::ClockID > &id)" -->
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<td class="memname">virtual <a class="el" href="group__gstreamermmEnums.html#gaa501f23d690de389e755e652093d9392">ClockReturn</a> Gst::Clock::wait_vfunc </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1ClockID.html">Gst::ClockID</a> >& </td>
<td class="paramname"> <em>id</em></td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<p>Perform a blocking wait for the given <a class="el" href="classGst_1_1ClockID.html" title="A datatype to hold the handle to an outstanding sync or async clock callback.">Gst::ClockID</a>. </p>
<p>Deprecated, implement <a class="el" href="classGst_1_1Clock.html#a288154df1dd7b163a3ce53603bd327bd" title="Perform a blocking wait on the given Gst::ClockID and return the jitter.">wait_jitter_vfunc()</a> instead. </p>
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<hr/><h2>Friends And Related Function Documentation</h2>
<a class="anchor" id="aa055df9465a22ca8144c637617a3fea9"></a><!-- doxytag: member="Gst::Clock::wrap" ref="aa055df9465a22ca8144c637617a3fea9" args="(GstClock *object, bool take_copy=false)" -->
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<td class="memname"><a class="elRef" href="../../../glibmm-2.4/reference/html/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGst_1_1Clock.html">Gst::Clock</a> > wrap </td>
<td>(</td>
<td class="paramtype">GstClock * </td>
<td class="paramname"> <em>object</em>, </td>
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<td class="paramtype">bool </td>
<td class="paramname"> <em>take_copy</em> = <code>false</code></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [related]</code></td>
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<p>A <a class="elRef" href="../../../glibmm-2.4/reference/html/namespaceGlib.html#a671306f4a3a0cae5ab4d7a9d54886592">Glib::wrap()</a> method for this object. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>object</em> </td><td>The C instance. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>take_copy</em> </td><td>False if the result should take ownership of the C instance. True if it should take a new copy or ref. </td></tr>
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</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>A C++ instance that wraps this C instance. </dd></dl>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>gstreamermm/clock.h</li>
</ul>
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