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| <a name="gst-plugins-bad-libs-GstVideoAggregator"></a><div class="titlepage"></div> |
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| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-bad-libs-GstVideoAggregator.top_of_page"></a>GstVideoAggregator</span></h2> |
| <p>GstVideoAggregator — Base class for video aggregators</p> |
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| <div class="refsect1"> |
| <a name="gst-plugins-bad-libs-GstVideoAggregator.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">struct</td> |
| <td class="function_name"><a class="link" href="gst-plugins-bad-libs-GstVideoAggregator.html#GstVideoAggregator" title="struct GstVideoAggregator">GstVideoAggregator</a></td> |
| </tr> |
| <tr> |
| <td class="datatype_keyword">struct</td> |
| <td class="function_name"><a class="link" href="gst-plugins-bad-libs-GstVideoAggregator.html#GstVideoAggregatorClass" title="struct GstVideoAggregatorClass">GstVideoAggregatorClass</a></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-libs-GstVideoAggregator.description"></a><h2>Description</h2> |
| <p>VideoAggregator can accept AYUV, ARGB and BGRA video streams. For each of the requested |
| sink pads it will compare the incoming geometry and framerate to define the |
| output parameters. Indeed output video frames will have the geometry of the |
| biggest incoming video stream and the framerate of the fastest incoming one.</p> |
| <p>VideoAggregator will do colorspace conversion.</p> |
| <p>Zorder for each input stream can be configured on the |
| <a class="link" href="gst-plugins-bad-libs-GstVideoAggregatorPad.html#GstVideoAggregatorPad" title="struct GstVideoAggregatorPad"><span class="type">GstVideoAggregatorPad</span></a>.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-libs-GstVideoAggregator.functions_details"></a><h2>Functions</h2> |
| <p></p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-libs-GstVideoAggregator.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstVideoAggregator"></a><h3>struct GstVideoAggregator</h3> |
| <pre class="programlisting">struct GstVideoAggregator { |
| GstAggregator aggregator; |
| |
| /* Output caps */ |
| GstVideoInfo info; |
| }; |
| </pre> |
| <div class="refsect3"> |
| <a name="id-1.2.8.2.6.2.4"></a><h4>Members</h4> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="300px" class="struct_members_name"> |
| <col class="struct_members_description"> |
| <col width="200px" class="struct_members_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="struct_member_name"><p><a class="link" href="gst-plugins-bad-libs-GstAggregator.html#GstAggregator" title="struct GstAggregator"><span class="type">GstAggregator</span></a> <em class="structfield"><code><a name="GstVideoAggregator.aggregator"></a>aggregator</code></em>;</p></td> |
| <td> </td> |
| <td> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideo.html#GstVideoInfo"><span class="type">GstVideoInfo</span></a> <em class="structfield"><code><a name="GstVideoAggregator.info"></a>info</code></em>;</p></td> |
| <td class="struct_member_description"><p>The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideo.html#GstVideoInfo"><span class="type">GstVideoInfo</span></a> representing the currently set |
| srcpad caps.</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoAggregatorClass"></a><h3>struct GstVideoAggregatorClass</h3> |
| <pre class="programlisting">struct GstVideoAggregatorClass { |
| GstCaps * (*update_caps) (GstVideoAggregator * videoaggregator, |
| GstCaps * caps); |
| GstFlowReturn (*aggregate_frames) (GstVideoAggregator * videoaggregator, |
| GstBuffer * outbuffer); |
| GstFlowReturn (*get_output_buffer) (GstVideoAggregator * videoaggregator, |
| GstBuffer ** outbuffer); |
| gboolean (*negotiated_caps) (GstVideoAggregator * videoaggregator, |
| GstCaps * caps); |
| void (*find_best_format) (GstVideoAggregator * vagg, |
| GstCaps * downstream_caps, |
| GstVideoInfo * best_info, |
| gboolean * at_least_one_alpha); |
| |
| gboolean preserve_update_caps_result; |
| |
| GstCaps *sink_non_alpha_caps; |
| }; |
| </pre> |
| <div class="refsect3"> |
| <a name="id-1.2.8.2.6.3.4"></a><h4>Members</h4> |
| <div class="informaltable"><table width="100%" border="0"> |
| <colgroup> |
| <col width="300px" class="struct_members_name"> |
| <col class="struct_members_description"> |
| <col width="200px" class="struct_members_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoAggregatorClass.update-caps"></a>update_caps</code></em> ()</p></td> |
| <td class="struct_member_description"><p>Optional. |
| Lets subclasses update the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstCaps.html"><span class="type">GstCaps</span></a> representing |
| the src pad caps before usage. Return <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to indicate failure.</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoAggregatorClass.aggregate-frames"></a>aggregate_frames</code></em> ()</p></td> |
| <td class="struct_member_description"><p>Lets subclasses aggregate frames that are ready. Subclasses |
| should iterate the GstElement.sinkpads and use the already |
| mapped <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideo.html#GstVideoFrame"><span class="type">GstVideoFrame</span></a> from GstVideoAggregatorPad.aggregated_frame |
| or directly use the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBuffer.html"><span class="type">GstBuffer</span></a> from GstVideoAggregatorPad.buffer |
| if it needs to map the buffer in a special way. The result of the |
| aggregation should land in <em class="parameter"><code>outbuffer</code></em> |
| .</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoAggregatorClass.get-output-buffer"></a>get_output_buffer</code></em> ()</p></td> |
| <td class="struct_member_description"><p>Optional. |
| Lets subclasses provide a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBuffer.html"><span class="type">GstBuffer</span></a> to be used as <em class="parameter"><code>outbuffer</code></em> |
| of |
| the <span class="type">aggregate_frames</span> vmethod.</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoAggregatorClass.negotiated-caps"></a>negotiated_caps</code></em> ()</p></td> |
| <td class="struct_member_description"><p>Optional. |
| Notifies subclasses what caps format has been negotiated</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoAggregatorClass.find-best-format"></a>find_best_format</code></em> ()</p></td> |
| <td class="struct_member_description"><p>Optional. |
| Lets subclasses decide of the best common format to use.</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstVideoAggregatorClass.preserve-update-caps-result"></a>preserve_update_caps_result</code></em>;</p></td> |
| <td class="struct_member_description"><p>Sub-classes should set this to true if the return result |
| of the <code class="function">update_caps()</code> method should not be further modified |
| by GstVideoAggregator by removing fields.</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstCaps.html"><span class="type">GstCaps</span></a> *<em class="structfield"><code><a name="GstVideoAggregatorClass.sink-non-alpha-caps"></a>sink_non_alpha_caps</code></em>;</p></td> |
| <td> </td> |
| <td> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
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