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| <div class="refentry"> |
| <a name="gstreamer-libs-GstFlowCombiner"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gstreamer-libs-GstFlowCombiner.top_of_page"></a>GstFlowCombiner</span></h2> |
| <p>GstFlowCombiner — Utility to combine multiple flow returns into one</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gstreamer-libs-GstFlowCombiner.functions"></a><h2>Functions</h2> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="functions_return"> |
| <col class="functions_name"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="function_type"> |
| <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="returnvalue">GstFlowCombiner</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-new" title="gst_flow_combiner_new ()">gst_flow_combiner_new</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-free" title="gst_flow_combiner_free ()">gst_flow_combiner_free</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-update-flow" title="gst_flow_combiner_update_flow ()">gst_flow_combiner_update_flow</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-add-pad" title="gst_flow_combiner_add_pad ()">gst_flow_combiner_add_pad</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-remove-pad" title="gst_flow_combiner_remove_pad ()">gst_flow_combiner_remove_pad</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-clear" title="gst_flow_combiner_clear ()">gst_flow_combiner_clear</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gstreamer-libs-GstFlowCombiner.other"></a><h2>Types and Values</h2> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="name"> |
| <col class="description"> |
| </colgroup> |
| <tbody><tr> |
| <td class="datatype_keyword"> </td> |
| <td class="function_name"><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner">GstFlowCombiner</a></td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gstreamer-libs-GstFlowCombiner.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gst/base/gstflowcombiner.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gstreamer-libs-GstFlowCombiner.description"></a><h2>Description</h2> |
| <p>Utility struct to help handling <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> combination. Useful for |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="type">GstElement</span></a>s that have multiple source pads and need to combine |
| the different <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> for those pads.</p> |
| <p><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> works by using the last <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> for all <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> |
| it has in its list and computes the combined return value and provides |
| it to the caller.</p> |
| <p>To add a new pad to the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> use <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-add-pad" title="gst_flow_combiner_add_pad ()"><code class="function">gst_flow_combiner_add_pad()</code></a>. |
| The new <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> is stored with a default value of <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-OK:CAPS"><code class="literal">GST_FLOW_OK</code></a>.</p> |
| <p>In case you want a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> to be removed, use <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-remove-pad" title="gst_flow_combiner_remove_pad ()"><code class="function">gst_flow_combiner_remove_pad()</code></a>.</p> |
| <p>Please be aware that this struct isn't thread safe as its designed to be |
| used by demuxers, those usually will have a single thread operating it.</p> |
| <p>These functions will take refs on the passed <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a>s.</p> |
| <p>Aside from reducing the user's code size, the main advantage of using this |
| helper struct is to follow the standard rules for <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> combination. |
| These rules are:</p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-EOS:CAPS"><code class="literal">GST_FLOW_EOS</code></a>: only if all returns are EOS too</p></li> |
| <li class="listitem"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-NOT-LINKED:CAPS"><code class="literal">GST_FLOW_NOT_LINKED</code></a>: only if all returns are NOT_LINKED too</p></li> |
| <li class="listitem"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-ERROR:CAPS"><code class="literal">GST_FLOW_ERROR</code></a> or below: if at least one returns an error return</p></li> |
| <li class="listitem"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-NOT-NEGOTIATED:CAPS"><code class="literal">GST_FLOW_NOT_NEGOTIATED</code></a>: if at least one returns a not-negotiated return</p></li> |
| <li class="listitem"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-FLUSHING:CAPS"><code class="literal">GST_FLOW_FLUSHING</code></a>: if at least one returns flushing</p></li> |
| <li class="listitem"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-OK:CAPS"><code class="literal">GST_FLOW_OK</code></a>: otherwise</p></li> |
| </ul></div> |
| <p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-ERROR:CAPS"><code class="literal">GST_FLOW_ERROR</code></a> or below, GST_FLOW_NOT_NEGOTIATED and GST_FLOW_FLUSHING are |
| returned immediatelly from the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-update-flow" title="gst_flow_combiner_update_flow ()"><code class="function">gst_flow_combiner_update_flow()</code></a> function.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gstreamer-libs-GstFlowCombiner.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="gst-flow-combiner-new"></a><h3>gst_flow_combiner_new ()</h3> |
| <pre class="programlisting"><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="returnvalue">GstFlowCombiner</span></a> * |
| gst_flow_combiner_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> |
| <p>Creates a new <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a>, use <a class="link" href="gstreamer-libs-GstFlowCombiner.html#gst-flow-combiner-free" title="gst_flow_combiner_free ()"><code class="function">gst_flow_combiner_free()</code></a> to free it.</p> |
| <div class="refsect3"> |
| <a name="id-1.2.4.13.7.2.5"></a><h4>Returns</h4> |
| <p> A new <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a></p> |
| </div> |
| <p class="since">Since: <a class="link" href="ix04.html#api-index-1.4">1.4</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-flow-combiner-free"></a><h3>gst_flow_combiner_free ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_flow_combiner_free (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> *combiner</code></em>);</pre> |
| <p>Frees a <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> struct and all its internal data.</p> |
| <div class="refsect3"> |
| <a name="id-1.2.4.13.7.3.5"></a><h4>Parameters</h4> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody><tr> |
| <td class="parameter_name"><p>combiner</p></td> |
| <td class="parameter_description"><p>the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> to free</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: <a class="link" href="ix04.html#api-index-1.4">1.4</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-flow-combiner-update-flow"></a><h3>gst_flow_combiner_update_flow ()</h3> |
| <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> |
| gst_flow_combiner_update_flow (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> *combiner</code></em>, |
| <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> fret</code></em>);</pre> |
| <p>Computes the combined flow return for the pads in it.</p> |
| <p>The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> parameter should be the last flow return update for a pad |
| in this <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a>. It will use this value to be able to shortcut some |
| combinations and avoid looking over all pads again. e.g. The last combined |
| return is the same as the latest obtained <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a>.</p> |
| <div class="refsect3"> |
| <a name="id-1.2.4.13.7.4.6"></a><h4>Parameters</h4> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>combiner</p></td> |
| <td class="parameter_description"><p>the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>fret</p></td> |
| <td class="parameter_description"><p>the latest <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> received for a pad in this <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="id-1.2.4.13.7.4.7"></a><h4>Returns</h4> |
| <p> The combined <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a></p> |
| </div> |
| <p class="since">Since: <a class="link" href="ix04.html#api-index-1.4">1.4</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-flow-combiner-add-pad"></a><h3>gst_flow_combiner_add_pad ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_flow_combiner_add_pad (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> *combiner</code></em>, |
| <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> *pad</code></em>);</pre> |
| <p>Adds a new <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> to the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a>.</p> |
| <div class="refsect3"> |
| <a name="id-1.2.4.13.7.5.5"></a><h4>Parameters</h4> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>combiner</p></td> |
| <td class="parameter_description"><p>the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>pad</p></td> |
| <td class="parameter_description"><p> the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> that is being added. </p></td> |
| <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: <a class="link" href="ix04.html#api-index-1.4">1.4</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-flow-combiner-remove-pad"></a><h3>gst_flow_combiner_remove_pad ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_flow_combiner_remove_pad (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> *combiner</code></em>, |
| <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> *pad</code></em>);</pre> |
| <p>Removes a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> from the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a>.</p> |
| <div class="refsect3"> |
| <a name="id-1.2.4.13.7.6.5"></a><h4>Parameters</h4> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>combiner</p></td> |
| <td class="parameter_description"><p>the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>pad</p></td> |
| <td class="parameter_description"><p> the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> to remove. </p></td> |
| <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: <a class="link" href="ix04.html#api-index-1.4">1.4</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-flow-combiner-clear"></a><h3>gst_flow_combiner_clear ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_flow_combiner_clear (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> *combiner</code></em>);</pre> |
| <p>Removes all pads from a <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> and resets it to its initial state.</p> |
| <div class="refsect3"> |
| <a name="id-1.2.4.13.7.7.5"></a><h4>Parameters</h4> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody><tr> |
| <td class="parameter_name"><p>combiner</p></td> |
| <td class="parameter_description"><p>the <a class="link" href="gstreamer-libs-GstFlowCombiner.html#GstFlowCombiner" title="GstFlowCombiner"><span class="type">GstFlowCombiner</span></a> to clear</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: <a class="link" href="ix03.html#api-index-1.6">1.6</a></p> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gstreamer-libs-GstFlowCombiner.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstFlowCombiner"></a><h3>GstFlowCombiner</h3> |
| <pre class="programlisting">typedef struct _GstFlowCombiner GstFlowCombiner;</pre> |
| <p>Opaque helper structure to aggregate flow returns.</p> |
| <p class="since">Since: <a class="link" href="ix04.html#api-index-1.4">1.4</a></p> |
| </div> |
| </div> |
| </div> |
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