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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#gst-plugins-base-libs-gstpbutilsdescriptions.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#gst-plugins-base-libs-gstpbutilsdescriptions.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstpbutilsdescriptions"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstpbutilsdescriptions.top_of_page"></a>gstpbutilsdescriptions</span></h2>
<p>gstpbutilsdescriptions — Provides human-readable descriptions for caps/codecs
and encoder, decoder, URI source and URI sink elements</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstpbutilsdescriptions.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gst/pbutils/descriptions.h&gt;

<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             <a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-get-source-description" title="gst_pb_utils_get_source_description ()">gst_pb_utils_get_source_description</a> (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *protocol</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             <a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-get-sink-description" title="gst_pb_utils_get_sink_description ()">gst_pb_utils_get_sink_description</a>   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *protocol</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             <a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-get-decoder-description" title="gst_pb_utils_get_decoder_description ()">gst_pb_utils_get_decoder_description</a>
                                                        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             <a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-get-encoder-description" title="gst_pb_utils_get_encoder_description ()">gst_pb_utils_get_encoder_description</a>
                                                        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             <a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-get-element-description" title="gst_pb_utils_get_element_description ()">gst_pb_utils_get_element_description</a>
                                                        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *factory_name</code></em>);

<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-add-codec-description-to-tag-list" title="gst_pb_utils_add_codec_description_to_tag_list ()">gst_pb_utils_add_codec_description_to_tag_list</a>
                                                        (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *taglist</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> *codec_tag</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             <a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-get-codec-description" title="gst_pb_utils_get_codec_description ()">gst_pb_utils_get_codec_description</a>  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstpbutilsdescriptions.description"></a><h2>Description</h2>
<p>
</p>
<div class="refsect2">
<a name="id-1.2.13.6.4.2.1"></a><p>
The above functions provide human-readable strings for media formats
and decoder/demuxer/depayloader/encoder/muxer/payloader elements for use
in error dialogs or other messages shown to users.
</p>
<p>
<a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-add-codec-description-to-tag-list" title="gst_pb_utils_add_codec_description_to_tag_list ()"><code class="function">gst_pb_utils_add_codec_description_to_tag_list()</code></a> is a utility function
for demuxer and decoder elements to add audio/video codec tags from a
given (fixed) <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a>.
</p>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstpbutilsdescriptions.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gst-pb-utils-get-source-description"></a><h3>gst_pb_utils_get_source_description ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             gst_pb_utils_get_source_description (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *protocol</code></em>);</pre>
<p>
Returns a localised string describing a source element handling the protocol
specified in <em class="parameter"><code>protocol</code></em>, for use in error dialogs or other messages to be
seen by the user. Should never return NULL unless <em class="parameter"><code>protocol</code></em> is invalid.
</p>
<p>
This function is mainly for internal use, applications would typically
use <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-description" title="gst_missing_plugin_message_get_description ()"><code class="function">gst_missing_plugin_message_get_description()</code></a> to get a description of
a missing feature from a missing-plugin message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>protocol</code></em> :</span></p></td>
<td>the protocol the source element needs to handle, e.g. "http"</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-allocated description string, or NULL on error. Free
string with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> when not needed any longer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pb-utils-get-sink-description"></a><h3>gst_pb_utils_get_sink_description ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             gst_pb_utils_get_sink_description   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *protocol</code></em>);</pre>
<p>
Returns a localised string describing a sink element handling the protocol
specified in <em class="parameter"><code>protocol</code></em>, for use in error dialogs or other messages to be
seen by the user. Should never return NULL unless <em class="parameter"><code>protocol</code></em> is invalid.
</p>
<p>
This function is mainly for internal use, applications would typically
use <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-description" title="gst_missing_plugin_message_get_description ()"><code class="function">gst_missing_plugin_message_get_description()</code></a> to get a description of
a missing feature from a missing-plugin message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>protocol</code></em> :</span></p></td>
<td>the protocol the sink element needs to handle, e.g. "http"</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-allocated description string, or NULL on error. Free
string with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> when not needed any longer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pb-utils-get-decoder-description"></a><h3>gst_pb_utils_get_decoder_description ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             gst_pb_utils_get_decoder_description
                                                        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Returns a localised string describing an decoder for the format specified
in <em class="parameter"><code>caps</code></em>, for use in error dialogs or other messages to be seen by the user.
Should never return NULL unless <em class="parameter"><code>factory_name</code></em> or <em class="parameter"><code>caps</code></em> are invalid.
</p>
<p>
This function is mainly for internal use, applications would typically
use <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-description" title="gst_missing_plugin_message_get_description ()"><code class="function">gst_missing_plugin_message_get_description()</code></a> to get a description of
a missing feature from a missing-plugin message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>the (fixed) <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> for which an decoder description is needed</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-allocated description string, or NULL on error. Free
string with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> when not needed any longer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pb-utils-get-encoder-description"></a><h3>gst_pb_utils_get_encoder_description ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             gst_pb_utils_get_encoder_description
                                                        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Returns a localised string describing an encoder for the format specified
in <em class="parameter"><code>caps</code></em>, for use in error dialogs or other messages to be seen by the user.
Should never return NULL unless <em class="parameter"><code>factory_name</code></em> or <em class="parameter"><code>caps</code></em> are invalid.
</p>
<p>
This function is mainly for internal use, applications would typically
use <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-description" title="gst_missing_plugin_message_get_description ()"><code class="function">gst_missing_plugin_message_get_description()</code></a> to get a description of
a missing feature from a missing-plugin message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>the (fixed) <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> for which an encoder description is needed</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-allocated description string, or NULL on error. Free
string with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> when not needed any longer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pb-utils-get-element-description"></a><h3>gst_pb_utils_get_element_description ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             gst_pb_utils_get_element_description
                                                        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *factory_name</code></em>);</pre>
<p>
Returns a localised string describing the given element, for use in
error dialogs or other messages to be seen by the user. Should never
return NULL unless <em class="parameter"><code>factory_name</code></em> is invalid.
</p>
<p>
This function is mainly for internal use, applications would typically
use <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-description" title="gst_missing_plugin_message_get_description ()"><code class="function">gst_missing_plugin_message_get_description()</code></a> to get a description of
a missing feature from a missing-plugin message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>factory_name</code></em> :</span></p></td>
<td>the name of the element, e.g. "giosrc"</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-allocated description string, or NULL on error. Free
string with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> when not needed any longer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pb-utils-add-codec-description-to-tag-list"></a><h3>gst_pb_utils_add_codec_description_to_tag_list ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_pb_utils_add_codec_description_to_tag_list
                                                        (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *taglist</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> *codec_tag</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Adds a codec tag describing the format specified by <em class="parameter"><code>caps</code></em> to <em class="parameter"><code>taglist</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>taglist</code></em> :</span></p></td>
<td>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>codec_tag</code></em> :</span></p></td>
<td>a GStreamer codec tag such as <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstTagList.html#GST-TAG-AUDIO-CODEC:CAPS"><span class="type">GST_TAG_AUDIO_CODEC</span></a>,
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstTagList.html#GST-TAG-VIDEO-CODEC:CAPS"><span class="type">GST_TAG_VIDEO_CODEC</span></a> or <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstTagList.html#GST-TAG-CODEC:CAPS"><span class="type">GST_TAG_CODEC</span></a>. If none is specified,
the function will attempt to detect the appropriate category. <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><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>the (fixed) <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> for which a codec tag should be added.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if a codec tag was added, FALSE otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pb-utils-get-codec-description"></a><h3>gst_pb_utils_get_codec_description ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             gst_pb_utils_get_codec_description  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Returns a localised (as far as this is possible) string describing the
media format specified in <em class="parameter"><code>caps</code></em>, for use in error dialogs or other messages
to be seen by the user. Should never return NULL unless <em class="parameter"><code>caps</code></em> is invalid.
</p>
<p>
Also see the convenience function
<a class="link" href="gst-plugins-base-libs-gstpbutilsdescriptions.html#gst-pb-utils-add-codec-description-to-tag-list" title="gst_pb_utils_add_codec_description_to_tag_list ()"><code class="function">gst_pb_utils_add_codec_description_to_tag_list()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>the (fixed) <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> for which an format description is needed</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-allocated description string, or NULL on error. Free
string with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> when not needed any longer.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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