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<title>GStreamer Base Plugins 1.0 Library Reference Manual: dmabuf</title>
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<a name="gst-plugins-base-libs-dmabuf"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-dmabuf.top_of_page"></a>dmabuf</span></h2>
<p>dmabuf — Memory wrapper for Linux dmabuf memory</p>
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<td class="gallery_image" valign="top" align="right"></td>
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<div class="refsect1">
<a name="gst-plugins-base-libs-dmabuf.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 href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMemory.html#GstMemory"><span class="returnvalue">GstMemory</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-dmabuf.html#gst-dmabuf-allocator-alloc" title="gst_dmabuf_allocator_alloc ()">gst_dmabuf_allocator_alloc</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-dmabuf.html#gst-dmabuf-memory-get-fd" title="gst_dmabuf_memory_get_fd ()">gst_dmabuf_memory_get_fd</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-dmabuf.html#gst-is-dmabuf-memory" title="gst_is_dmabuf_memory ()">gst_is_dmabuf_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-dmabuf.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-dmabuf.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gst/allocators/gstdmabuf.h>
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-dmabuf.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-dmabuf.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-dmabuf-allocator-alloc"></a><h3>gst_dmabuf_allocator_alloc ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMemory.html#GstMemory"><span class="returnvalue">GstMemory</span></a> *
gst_dmabuf_allocator_alloc (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstAllocator.html"><span class="type">GstAllocator</span></a> *allocator</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> fd</code></em>,
<em class="parameter"><code><span class="type">gsize</span> size</code></em>);</pre>
<p>Return a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMemory.html#GstMemory"><code class="literal">GstMemory</code></a> that wraps a dmabuf file descriptor.</p>
<div class="refsect3">
<a name="id-1.2.4.3.7.2.5"></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>allocator</p></td>
<td class="parameter_description"><p> allocator to be used for this memory. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>fd</p></td>
<td class="parameter_description"><p>dmabuf file descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>memory size</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.4.3.7.2.6"></a><h4>Returns</h4>
<p> a GstMemory based on <em class="parameter"><code>allocator</code></em>
.
When the buffer will be released dmabuf allocator will close the <em class="parameter"><code>fd</code></em>
.
The memory is only mmapped on <code class="function">gst_buffer_mmap()</code> request. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-dmabuf-memory-get-fd"></a><h3>gst_dmabuf_memory_get_fd ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gst_dmabuf_memory_get_fd (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMemory.html#GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Return the file descriptor associated with <em class="parameter"><code>mem</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.4.3.7.3.5"></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>mem</p></td>
<td class="parameter_description"><p>the memory to get the file descriptor</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.4.3.7.3.6"></a><h4>Returns</h4>
<p> the file descriptor associated with the memory, or -1</p>
<p></p>
</div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-is-dmabuf-memory"></a><h3>gst_is_dmabuf_memory ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_is_dmabuf_memory (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMemory.html#GstMemory"><span class="type">GstMemory</span></a> *mem</code></em>);</pre>
<p>Check if <em class="parameter"><code>mem</code></em>
is dmabuf memory.</p>
<div class="refsect3">
<a name="id-1.2.4.3.7.4.5"></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>mem</p></td>
<td class="parameter_description"><p>the memory to be check</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.4.3.7.4.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>mem</code></em>
is dmabuf memory, otherwise <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a></p>
<p></p>
</div>
<p class="since">Since 1.2</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-dmabuf.other_details"></a><h2>Types and Values</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-dmabuf.see-also"></a><h2>See Also</h2>
<p><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMemory.html#GstMemory"><span class="type">GstMemory</span></a></p>
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