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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>GstTypeFindHelper</title>
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<a href="#gstreamer-libs-GstTypeFindHelper.synopsis" class="shortcut">Top</a>
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<a href="#gstreamer-libs-GstTypeFindHelper.description" class="shortcut">Description</a>
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<div class="refentry" title="GstTypeFindHelper">
<a name="gstreamer-libs-GstTypeFindHelper"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gstreamer-libs-GstTypeFindHelper.top_of_page"></a>GstTypeFindHelper</span></h2>
<p>GstTypeFindHelper — Utility functions for typefinding</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="gstreamer-libs-GstTypeFindHelper.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/base/gsttypefindhelper.h>
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper" title="gst_type_find_helper ()">gst_type_find_helper</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a> *src</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> size</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper-for-buffer" title="gst_type_find_helper_for_buffer ()">gst_type_find_helper_for_buffer</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTypeFind.html#GstTypeFindProbability"><span class="type">GstTypeFindProbability</span></a> *prob</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper-for-extension" title="gst_type_find_helper_for_extension ()">gst_type_find_helper_for_extension</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *extension</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (<a class="link" href="gstreamer-libs-GstTypeFindHelper.html#GstTypeFindHelperGetRangeFunction" title="GstTypeFindHelperGetRangeFunction ()">*GstTypeFindHelperGetRangeFunction</a>)
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> offset</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> length</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper-get-range" title="gst_type_find_helper_get_range ()">gst_type_find_helper_get_range</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstTypeFindHelper.html#GstTypeFindHelperGetRangeFunction" title="GstTypeFindHelperGetRangeFunction ()"><span class="type">GstTypeFindHelperGetRangeFunction</span></a> func</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> size</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTypeFind.html#GstTypeFindProbability"><span class="type">GstTypeFindProbability</span></a> *prob</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper-get-range-ext" title="gst_type_find_helper_get_range_ext ()">gst_type_find_helper_get_range_ext</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstTypeFindHelper.html#GstTypeFindHelperGetRangeFunction" title="GstTypeFindHelperGetRangeFunction ()"><span class="type">GstTypeFindHelperGetRangeFunction</span></a> func</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> size</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *extension</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTypeFind.html#GstTypeFindProbability"><span class="type">GstTypeFindProbability</span></a> *prob</code></em>);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="gstreamer-libs-GstTypeFindHelper.description"></a><h2>Description</h2>
<p>
Utility functions for elements doing typefinding:
<a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper" title="gst_type_find_helper ()"><code class="function">gst_type_find_helper()</code></a> does typefinding in pull mode, while
<a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper-for-buffer" title="gst_type_find_helper_for_buffer ()"><code class="function">gst_type_find_helper_for_buffer()</code></a> is useful for elements needing to do
typefinding in push mode from a chain function.
</p>
</div>
<div class="refsect1" title="Details">
<a name="gstreamer-libs-GstTypeFindHelper.details"></a><h2>Details</h2>
<div class="refsect2" title="gst_type_find_helper ()">
<a name="gst-type-find-helper"></a><h3>gst_type_find_helper ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_type_find_helper (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a> *src</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> size</code></em>);</pre>
<p>
Tries to find what type of data is flowing from the given source <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>A source <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The length in bytes
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> corresponding to the data stream.
Returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> if no <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> matches the data stream.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_type_find_helper_for_buffer ()">
<a name="gst-type-find-helper-for-buffer"></a><h3>gst_type_find_helper_for_buffer ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_type_find_helper_for_buffer (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buf</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTypeFind.html#GstTypeFindProbability"><span class="type">GstTypeFindProbability</span></a> *prob</code></em>);</pre>
<p>
Tries to find what type of data is contained in the given <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a>, the
assumption being that the buffer represents the beginning of the stream or
file.
</p>
<p>
All available typefinders will be called on the data in order of rank. If
a typefinding function returns a probability of <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTypeFind.html#GST-TYPE-FIND-MAXIMUM:CAPS"><span class="type">GST_TYPE_FIND_MAXIMUM</span></a>,
typefinding is stopped immediately and the found caps will be returned
right away. Otherwise, all available typefind functions will the tried,
and the caps with the highest probability will be returned, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> if
the content of the buffer could not be identified.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>object doing the typefinding, or NULL (used for logging)
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> with data to typefind
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prob</code></em> :</span></p></td>
<td>location to store the probability of the found caps, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> corresponding to the data, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> if no type could
be found. The caller should free the caps returned with <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#gst-caps-unref"><code class="function">gst_caps_unref()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_type_find_helper_for_extension ()">
<a name="gst-type-find-helper-for-extension"></a><h3>gst_type_find_helper_for_extension ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_type_find_helper_for_extension (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *extension</code></em>);</pre>
<p>
Tries to find the best <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> associated with <em class="parameter"><code>extension</code></em>.
</p>
<p>
All available typefinders will be checked against the extension in order
of rank. The caps of the first typefinder that can handle <em class="parameter"><code>extension</code></em> will be
returned.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>object doing the typefinding, or NULL (used for logging)
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension</code></em> :</span></p></td>
<td>an extension
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> corresponding to <em class="parameter"><code>extension</code></em>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> if no type could
be found. The caller should free the caps returned with <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#gst-caps-unref"><code class="function">gst_caps_unref()</code></a>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.23</p>
</div>
<hr>
<div class="refsect2" title="GstTypeFindHelperGetRangeFunction ()">
<a name="GstTypeFindHelperGetRangeFunction"></a><h3>GstTypeFindHelperGetRangeFunction ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (*GstTypeFindHelperGetRangeFunction)
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> offset</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> length</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);</pre>
<p>
This function will be called by <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper-get-range" title="gst_type_find_helper_get_range ()"><code class="function">gst_type_find_helper_get_range()</code></a> when
typefinding functions request to peek at the data of a stream at certain
offsets. If this function returns GST_FLOW_OK, the result buffer will be
stored in <em class="parameter"><code>buffer</code></em>. The contents of <em class="parameter"><code>buffer</code></em> is invalid for any other
return value.
</p>
<p>
This function is supposed to behave exactly like a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html#GstPadGetRangeFunction"><span class="type">GstPadGetRangeFunction</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> that will handle the getrange request
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>the offset of the range
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>the length of the range
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>a memory location to hold the result buffer
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> GST_FLOW_OK for success
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_type_find_helper_get_range ()">
<a name="gst-type-find-helper-get-range"></a><h3>gst_type_find_helper_get_range ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_type_find_helper_get_range (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstTypeFindHelper.html#GstTypeFindHelperGetRangeFunction" title="GstTypeFindHelperGetRangeFunction ()"><span class="type">GstTypeFindHelperGetRangeFunction</span></a> func</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> size</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTypeFind.html#GstTypeFindProbability"><span class="type">GstTypeFindProbability</span></a> *prob</code></em>);</pre>
<p>
Utility function to do pull-based typefinding. Unlike <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper" title="gst_type_find_helper ()"><code class="function">gst_type_find_helper()</code></a>
however, this function will use the specified function <em class="parameter"><code>func</code></em> to obtain the
data needed by the typefind functions, rather than operating on a given
source pad. This is useful mostly for elements like tag demuxers which
strip off data at the beginning and/or end of a file and want to typefind
the stripped data stream before adding their own source pad (the specified
callback can then call the upstream peer pad with offsets adjusted for the
tag size, for example).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> that will be passed as first argument to <em class="parameter"><code>func</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>A generic <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#GstTypeFindHelperGetRangeFunction" title="GstTypeFindHelperGetRangeFunction ()"><span class="type">GstTypeFindHelperGetRangeFunction</span></a> that will be used
to access data at random offsets when doing the typefinding
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The length in bytes
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prob</code></em> :</span></p></td>
<td>location to store the probability of the found caps, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> corresponding to the data stream.
Returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> if no <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> matches the data stream.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_type_find_helper_get_range_ext ()">
<a name="gst-type-find-helper-get-range-ext"></a><h3>gst_type_find_helper_get_range_ext ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_type_find_helper_get_range_ext (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> *obj</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstTypeFindHelper.html#GstTypeFindHelperGetRangeFunction" title="GstTypeFindHelperGetRangeFunction ()"><span class="type">GstTypeFindHelperGetRangeFunction</span></a> func</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> size</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *extension</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTypeFind.html#GstTypeFindProbability"><span class="type">GstTypeFindProbability</span></a> *prob</code></em>);</pre>
<p>
Utility function to do pull-based typefinding. Unlike <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#gst-type-find-helper" title="gst_type_find_helper ()"><code class="function">gst_type_find_helper()</code></a>
however, this function will use the specified function <em class="parameter"><code>func</code></em> to obtain the
data needed by the typefind functions, rather than operating on a given
source pad. This is useful mostly for elements like tag demuxers which
strip off data at the beginning and/or end of a file and want to typefind
the stripped data stream before adding their own source pad (the specified
callback can then call the upstream peer pad with offsets adjusted for the
tag size, for example).
</p>
<p>
When <em class="parameter"><code>extension</code></em> is not NULL, this function will first try the typefind
functions for the given extension, which might speed up the typefinding
in many cases.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html"><span class="type">GstObject</span></a> that will be passed as first argument to <em class="parameter"><code>func</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>A generic <a class="link" href="gstreamer-libs-GstTypeFindHelper.html#GstTypeFindHelperGetRangeFunction" title="GstTypeFindHelperGetRangeFunction ()"><span class="type">GstTypeFindHelperGetRangeFunction</span></a> that will be used
to access data at random offsets when doing the typefinding
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The length in bytes
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension</code></em> :</span></p></td>
<td>extenstion of the media
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prob</code></em> :</span></p></td>
<td>location to store the probability of the found caps, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> corresponding to the data stream.
Returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> if no <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> matches the data stream.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.26</p>
</div>
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