~ubuntu-branches/ubuntu/trusty/gstreamer1.0/trusty-proposed

<p>GstBaseSink — Base class for sink elements</p>

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> *min_latency</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> *max_latency</code></em>);

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        <a class="link" href="GstBaseSink.html#gst-base-sink-get-latency" title="gst_base_sink_get_latency ()">gst_base_sink_get_latency</a>           (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="GstBaseSink.html#gst-base-sink-do-preroll" title="gst_base_sink_do_preroll ()">gst_base_sink_do_preroll</a>            (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMiniObject.html#GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</code></em>);

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="GstBaseSink.html#gst-base-sink-wait-preroll" title="gst_base_sink_wait_preroll ()">gst_base_sink_wait_preroll</a>          (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockReturn"><span class="returnvalue">GstClockReturn</span></a>      <a class="link" href="GstBaseSink.html#gst-base-sink-wait-clock" title="gst_base_sink_wait_clock ()">gst_base_sink_wait_clock</a>            (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> *jitter</code></em>);

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> offset</code></em>);

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="returnvalue">GstClockTimeDiff</span></a>    <a class="link" href="GstBaseSink.html#gst-base-sink-get-ts-offset" title="gst_base_sink_get_ts_offset ()">gst_base_sink_get_ts_offset</a>         (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> delay</code></em>);

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        <a class="link" href="GstBaseSink.html#gst-base-sink-get-render-delay" title="gst_base_sink_get_render_delay ()">gst_base_sink_get_render_delay</a>      (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstSample.html#GstSample"><span class="returnvalue">GstSample</span></a> *         <a class="link" href="GstBaseSink.html#gst-base-sink-get-last-sample" title="gst_base_sink_get_last_sample ()">gst_base_sink_get_last_sample</a>       (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);

         +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>

               +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>

  "<a class="link" href="GstBaseSink.html#GstBaseSink--last-sample" title='The "last-sample" property'>last-sample</a>"              <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstSample.html#GstSample"><span class="type">GstSample</span></a>*            : Read

<p>

<a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> is the base class for sink elements in GStreamer, such as

xvimagesink or filesink. It is a layer on top of <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="type">GstElement</span></a> that provides a

simplified interface to plugin writers. <a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> handles many details

for you, for example: preroll, clock synchronization, state changes,

activation in push or pull mode, and queries.

</p>

<p>

In most cases, when writing sink elements, there is no need to implement

class methods from <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="type">GstElement</span></a> or to set functions on pads, because the

<a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> infrastructure should be sufficient.

</p>

<p>

<a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> provides support for exactly one sink pad, which should be

named "sink". A sink implementation (subclass of <a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a>) should

install a pad template in its class_init function, like so:

</p>

<div class="informalexample">

  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">

    <tbody>

      <tr>

        <td class="listing_lines" align="right"><pre>1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16</pre></td>

        <td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">static void</span>

<span class="function">my_element_class_init</span> <span class="gtkdoc opt">(</span>GstMyElementClass <span class="gtkdoc opt">*</span>klass<span class="gtkdoc opt">)</span>

<span class="gtkdoc opt">{</span>

  GstElementClass <span class="gtkdoc opt">*</span>gstelement_class <span class="gtkdoc opt">=</span> <span class="function">GST_ELEMENT_CLASS</span> <span class="gtkdoc opt">(</span>klass<span class="gtkdoc opt">);</span>

 

  <span class="gtkdoc slc">// sinktemplate should be a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPadTemplate.html#GstStaticPadTemplate">GstStaticPadTemplate</a> with direction</span>

  <span class="gtkdoc slc">// <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-PAD-SINK:CAPS">GST_PAD_SINK</a> and name &quot;sink&quot;</span>

  <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-class-add-pad-template">gst_element_class_add_pad_template</a></span> <span class="gtkdoc opt">(</span>gstelement_class<span class="gtkdoc opt">,</span>

      <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPadTemplate.html#gst-static-pad-template-get">gst_static_pad_template_get</a></span> <span class="gtkdoc opt">(&amp;</span>sinktemplate<span class="gtkdoc opt">));</span>

 

  <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-class-set-static-metadata">gst_element_class_set_static_metadata</a></span> <span class="gtkdoc opt">(</span>gstelement_class<span class="gtkdoc opt">,</span>

      <span class="string">&quot;Sink name&quot;</span><span class="gtkdoc opt">,</span>

      <span class="string">&quot;Sink&quot;</span><span class="gtkdoc opt">,</span>

      <span class="string">&quot;My Sink element&quot;</span><span class="gtkdoc opt">,</span>

      <span class="string">&quot;The author &lt;my.sink&#64;my.email&gt;&quot;</span><span class="gtkdoc opt">);</span>

<span class="gtkdoc opt">}</span></pre></td>

      </tr>

    </tbody>

  </table>

</div>

 

<p>

</p>

<p>

<a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> will handle the prerolling correctly. This means that it will

return <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><span class="type">GST_STATE_CHANGE_ASYNC</span></a> from a state change to PAUSED until the first

buffer arrives in this element. The base class will call the

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.preroll"><code class="function">GstBaseSinkClass.preroll()</code></a> vmethod with this preroll buffer and will then

commit the state change to the next asynchronously pending state.

</p>

<p>

When the element is set to PLAYING, <a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> will synchronise on the

clock using the times returned from <a class="link" href="GstBaseSink.html#GstBaseSinkClass.get-times"><code class="function">GstBaseSinkClass.get_times()</code></a>. If this

function returns <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GST-CLOCK-TIME-NONE:CAPS"><span class="type">GST_CLOCK_TIME_NONE</span></a> for the start time, no synchronisation

will be done. Synchronisation can be disabled entirely by setting the object

<a class="link" href="GstBaseSink.html#GstBaseSink--sync" title='The "sync" property'><span class="type">"sync"</span></a> property to <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.

</p>

<p>

After synchronisation the virtual method <a class="link" href="GstBaseSink.html#GstBaseSinkClass.render"><code class="function">GstBaseSinkClass.render()</code></a> will be

called. Subclasses should minimally implement this method.

</p>

<p>

Subclasses that synchronise on the clock in the <a class="link" href="GstBaseSink.html#GstBaseSinkClass.render"><code class="function">GstBaseSinkClass.render()</code></a>

method are supported as well. These classes typically receive a buffer in

the render method and can then potentially block on the clock while

rendering. A typical example is an audiosink.

These subclasses can use <a class="link" href="GstBaseSink.html#gst-base-sink-wait-preroll" title="gst_base_sink_wait_preroll ()"><code class="function">gst_base_sink_wait_preroll()</code></a> to perform the

blocking wait.

</p>

<p>

Upon receiving the EOS event in the PLAYING state, <a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> will wait

for the clock to reach the time indicated by the stop time of the last

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.get-times"><code class="function">GstBaseSinkClass.get_times()</code></a> call before posting an EOS message. When the

element receives EOS in PAUSED, preroll completes, the event is queued and an

EOS message is posted when going to PLAYING.

</p>

<p>

<a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> will internally use the <span class="type">GST_EVENT_NEWSEGMENT</span> events to schedule

synchronisation and clipping of buffers. Buffers that fall completely outside

of the current segment are dropped. Buffers that fall partially in the

segment are rendered (and prerolled). Subclasses should do any subbuffer

clipping themselves when needed.

</p>

<p>

<a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> will by default report the current playback position in

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstFormat.html#GST-FORMAT-TIME:CAPS"><span class="type">GST_FORMAT_TIME</span></a> based on the current clock time and segment information.

If no clock has been set on the element, the query will be forwarded

upstream.

</p>

<p>

The <a class="link" href="GstBaseSink.html#GstBaseSinkClass.set-caps"><code class="function">GstBaseSinkClass.set_caps()</code></a> function will be called when the subclass

should configure itself to process a specific media type.

</p>

<p>

The <a class="link" href="GstBaseSink.html#GstBaseSinkClass.start"><code class="function">GstBaseSinkClass.start()</code></a> and <a class="link" href="GstBaseSink.html#GstBaseSinkClass.stop"><code class="function">GstBaseSinkClass.stop()</code></a> virtual methods

will be called when resources should be allocated. Any 

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.preroll"><code class="function">GstBaseSinkClass.preroll()</code></a>, <a class="link" href="GstBaseSink.html#GstBaseSinkClass.render"><code class="function">GstBaseSinkClass.render()</code></a> and

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.set-caps"><code class="function">GstBaseSinkClass.set_caps()</code></a> function will be called between the

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.start"><code class="function">GstBaseSinkClass.start()</code></a> and <a class="link" href="GstBaseSink.html#GstBaseSinkClass.stop"><code class="function">GstBaseSinkClass.stop()</code></a> calls.

</p>

<p>

The <a class="link" href="GstBaseSink.html#GstBaseSinkClass.event"><code class="function">GstBaseSinkClass.event()</code></a> virtual method will be called when an event is

received by <a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a>. Normally this method should only be overriden by

very specific elements (such as file sinks) which need to handle the

newsegment event specially.

</p>

<p>

The <a class="link" href="GstBaseSink.html#GstBaseSinkClass.unlock"><code class="function">GstBaseSinkClass.unlock()</code></a> method is called when the elements should

unblock any blocking operations they perform in the

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.render"><code class="function">GstBaseSinkClass.render()</code></a> method. This is mostly useful when the

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.render"><code class="function">GstBaseSinkClass.render()</code></a> method performs a blocking write on a file

descriptor, for example.

</p>

<p>

The <a class="link" href="GstBaseSink.html#GstBaseSink--max-lateness" title='The "max-lateness" property'><span class="type">"max-lateness"</span></a> property affects how the sink deals with

buffers that arrive too late in the sink. A buffer arrives too late in the

sink when the presentation time (as a combination of the last segment, buffer

timestamp and element base_time) plus the duration is before the current

time of the clock.

If the frame is later than max-lateness, the sink will drop the buffer

without calling the render method.

This feature is disabled if sync is disabled, the

<a class="link" href="GstBaseSink.html#GstBaseSinkClass.get-times"><code class="function">GstBaseSinkClass.get_times()</code></a> method does not return a valid start time or

max-lateness is set to -1 (the default).

Subclasses can use <a class="link" href="GstBaseSink.html#gst-base-sink-set-max-lateness" title="gst_base_sink_set_max_lateness ()"><code class="function">gst_base_sink_set_max_lateness()</code></a> to configure the

max-lateness value.

</p>

<p>

The <a class="link" href="GstBaseSink.html#GstBaseSink--qos" title='The "qos" property'><span class="type">"qos"</span></a> property will enable the quality-of-service features of

the basesink which gather statistics about the real-time performance of the

clock synchronisation. For each buffer received in the sink, statistics are

gathered and a QOS event is sent upstream with these numbers. This

information can then be used by upstream elements to reduce their processing

rate, for example.

</p>

<p>

The <a class="link" href="GstBaseSink.html#GstBaseSink--async" title='The "async" property'><span class="type">"async"</span></a> property can be used to instruct the sink to never

perform an ASYNC state change. This feature is mostly usable when dealing

with non-synchronized streams or sparse streams.

</p>

<p>

Last reviewed on 2007-08-29 (0.10.15)

</p>

<td><p><span class="term"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#GstElementClass"><span class="type">GstElementClass</span></a> <em class="structfield"><code><a name="GstBaseSinkClass.parent-class"></a>parent_class</code></em>;</span></p></td>

<td>perform a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstQuery.html#GstQuery"><span class="type">GstQuery</span></a> on the element.</td>

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> *min_latency</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> *max_latency</code></em>);</pre>

<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        gst_base_sink_get_latency           (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);</pre>

<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_base_sink_do_preroll            (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMiniObject.html#GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</code></em>);</pre>

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> if the preroll completed and processing can

<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_base_sink_wait_preroll          (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);</pre>

case this function returns <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a>) or the processing must be stopped due

returns <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-FLUSHING:CAPS"><span class="type">GST_FLOW_FLUSHING</span></a>).

<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> if the preroll completed and processing can

<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockReturn"><span class="returnvalue">GstClockReturn</span></a>      gst_base_sink_wait_clock            (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>,

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> *jitter</code></em>);</pre>

If <em class="parameter"><code>time</code></em> is not valid, no sycnhronisation is done and <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GST-CLOCK-BADTIME:CAPS"><span class="type">GST_CLOCK_BADTIME</span></a> is

is no clock, no synchronisation is done and <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GST-CLOCK-BADTIME:CAPS"><span class="type">GST_CLOCK_BADTIME</span></a> is returned.

<td><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockReturn"><span class="type">GstClockReturn</span></a></td>

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> offset</code></em>);</pre>

<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="returnvalue">GstClockTimeDiff</span></a>    gst_base_sink_get_ts_offset         (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);</pre>

                                                         <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> delay</code></em>);</pre>

<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        gst_base_sink_get_render_delay      (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);</pre>

<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstSample.html#GstSample"><span class="returnvalue">GstSample</span></a> *         gst_base_sink_get_last_sample       (<em class="parameter"><code><a class="link" href="GstBaseSink.html" title="GstBaseSink"><span class="type">GstBaseSink</span></a> *sink</code></em>);</pre>

The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> on the sample can be used to determine the type of the buffer.

<td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstSample.html#GstSample"><span class="type">GstSample</span></a>. <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstSample.html#gst-sample-unref"><code class="function">gst_sample_unref()</code></a> after usage.

Gives the pointer to the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> object of the element.

<pre class="programlisting">  "last-sample"              <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstSample.html#GstSample"><span class="type">GstSample</span></a>*            : Read</pre>

<div class="refsect1">

<a name="GstBaseSink.see-also"></a><h2>See Also</h2>

<a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a>, <a class="link" href="GstBaseSrc.html" title="GstBaseSrc"><span class="type">GstBaseSrc</span></a>

</div>