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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>GStreamer 0.10 Core Reference Manual: GstFormat</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#gstreamer-GstFormat.description" class="shortcut">Description</a></span>
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<a name="gstreamer-GstFormat"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gstreamer-GstFormat.top_of_page"></a>GstFormat</span></h2>
<p>GstFormat — Dynamically register new data formats</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gstreamer-GstFormat.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">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstFormat.html#gst-format-get-name" title="gst_format_get_name ()">gst_format_get_name</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstFormat.html#gst-format-to-quark" title="gst_format_to_quark ()">gst_format_to_quark</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="returnvalue">GstFormat</span></a>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstFormat.html#gst-format-register" title="gst_format_register ()">gst_format_register</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="returnvalue">GstFormat</span></a>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstFormat.html#gst-format-get-by-nick" title="gst_format_get_by_nick ()">gst_format_get_by_nick</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="gstreamer-GstFormat.html#gst-formats-contains" title="gst_formats_contains ()">gst_formats_contains</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a class="link" href="gstreamer-GstFormat.html#GstFormatDefinition" title="struct GstFormatDefinition"><span class="returnvalue">GstFormatDefinition</span></a> *
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstFormat.html#gst-format-get-details" title="gst_format_get_details ()">gst_format_get_details</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstFormat.html#gst-format-iterate-definitions" title="gst_format_iterate_definitions ()">gst_format_iterate_definitions</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gstreamer-GstFormat.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">enum</td>
<td class="function_name"><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat">GstFormat</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gstreamer-GstFormat.html#GST-FORMAT-PERCENT-MAX:CAPS" title="GST_FORMAT_PERCENT_MAX">GST_FORMAT_PERCENT_MAX</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gstreamer-GstFormat.html#GST-FORMAT-PERCENT-SCALE:CAPS" title="GST_FORMAT_PERCENT_SCALE">GST_FORMAT_PERCENT_SCALE</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gstreamer-GstFormat.html#GstFormatDefinition" title="struct GstFormatDefinition">GstFormatDefinition</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gstreamer-GstFormat.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gstreamer-GstFormat.description"></a><h2>Description</h2>
<p>GstFormats functions are used to register a new format to the gstreamer
core.  Formats can be used to perform seeking or conversions/query
operations.</p>
</div>
<div class="refsect1">
<a name="gstreamer-GstFormat.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-format-get-name"></a><h3>gst_format_get_name ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gst_format_get_name (<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>);</pre>
<p>Get a printable name for the given format. Do not modify or free.</p>
<div class="refsect3">
<a name="id-1.3.19.7.2.5"></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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.19.7.2.6"></a><h4>Returns</h4>
<p> a reference to the static name of the format or NULL if
the format is unknown.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-format-to-quark"></a><h3>gst_format_to_quark ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a>
gst_format_to_quark (<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>);</pre>
<p>Get the unique quark for the given format.</p>
<div class="refsect3">
<a name="id-1.3.19.7.3.5"></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>format</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.19.7.3.6"></a><h4>Returns</h4>
<p> the quark associated with the format or 0 if the format
is unknown.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-format-register"></a><h3>gst_format_register ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="returnvalue">GstFormat</span></a>
gst_format_register (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *nick</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> *description</code></em>);</pre>
<p>Create a new GstFormat based on the nick or return an
already registered format with that nick.</p>
<div class="refsect3">
<a name="id-1.3.19.7.4.5"></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>nick</p></td>
<td class="parameter_description"><p>The nick of the new format</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>description</p></td>
<td class="parameter_description"><p>The description of the new format</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.19.7.4.6"></a><h4>Returns</h4>
<p> A new GstFormat or an already registered format
with the same nick.</p>
<p>MT safe.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-format-get-by-nick"></a><h3>gst_format_get_by_nick ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="returnvalue">GstFormat</span></a>
gst_format_get_by_nick (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *nick</code></em>);</pre>
<p>Return the format registered with the given nick.</p>
<div class="refsect3">
<a name="id-1.3.19.7.5.5"></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>nick</p></td>
<td class="parameter_description"><p>The nick of the format</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.19.7.5.6"></a><h4>Returns</h4>
<p> The format with <em class="parameter"><code>nick</code></em>
or GST_FORMAT_UNDEFINED
if the format was not registered.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-formats-contains"></a><h3>gst_formats_contains ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_formats_contains (<em class="parameter"><code>const <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *formats</code></em>,
                      <em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>);</pre>
<p>See if the given format is inside the format array.</p>
<div class="refsect3">
<a name="id-1.3.19.7.6.5"></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>formats</p></td>
<td class="parameter_description"><p>The format array to search</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>the format to find</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.19.7.6.6"></a><h4>Returns</h4>
<p> TRUE if the format is found inside the array</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-format-get-details"></a><h3>gst_format_get_details ()</h3>
<pre class="programlisting">const <a class="link" href="gstreamer-GstFormat.html#GstFormatDefinition" title="struct GstFormatDefinition"><span class="returnvalue">GstFormatDefinition</span></a> *
gst_format_get_details (<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>);</pre>
<p>Get details about the given format.</p>
<div class="refsect3">
<a name="id-1.3.19.7.7.5"></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>format</p></td>
<td class="parameter_description"><p>The format to get details of</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.19.7.7.6"></a><h4>Returns</h4>
<p> The <a class="link" href="gstreamer-GstFormat.html#GstFormatDefinition" title="struct GstFormatDefinition"><span class="type">GstFormatDefinition</span></a> for <em class="parameter"><code>format</code></em>
or NULL on failure.</p>
<p>MT safe.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-format-iterate-definitions"></a><h3>gst_format_iterate_definitions ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
gst_format_iterate_definitions (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Iterate all the registered formats. The format definition is read
only.</p>
<div class="refsect3">
<a name="id-1.3.19.7.8.5"></a><h4>Returns</h4>
<p> a GstIterator of <a class="link" href="gstreamer-GstFormat.html#GstFormatDefinition" title="struct GstFormatDefinition"><span class="type">GstFormatDefinition</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-GstFormat.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstFormat"></a><h3>enum GstFormat</h3>
<p>Standard predefined formats</p>
<div class="refsect3">
<a name="id-1.3.19.8.2.4"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-FORMAT-UNDEFINED:CAPS"></a>GST_FORMAT_UNDEFINED</p></td>
<td class="enum_member_description">
<p>undefined format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-FORMAT-DEFAULT:CAPS"></a>GST_FORMAT_DEFAULT</p></td>
<td class="enum_member_description">
<p>the default format of the pad/element. This can be
   samples for raw audio, frames/fields for raw video (some, but not all,
   elements support this; use <em class="parameter"><code>GST_FORMAT_TIME</code></em>
 if you don't have a good
   reason to query for samples/frames)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-FORMAT-BYTES:CAPS"></a>GST_FORMAT_BYTES</p></td>
<td class="enum_member_description">
<p>bytes</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-FORMAT-TIME:CAPS"></a>GST_FORMAT_TIME</p></td>
<td class="enum_member_description">
<p>time in nanoseconds</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-FORMAT-BUFFERS:CAPS"></a>GST_FORMAT_BUFFERS</p></td>
<td class="enum_member_description">
<p>buffers (few, if any, elements implement this as of
    May 2009)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-FORMAT-PERCENT:CAPS"></a>GST_FORMAT_PERCENT</p></td>
<td class="enum_member_description">
<p>percentage of stream (few, if any, elements implement
    this as of May 2009)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-FORMAT-PERCENT-MAX:CAPS"></a><h3>GST_FORMAT_PERCENT_MAX</h3>
<pre class="programlisting">#define GST_FORMAT_PERCENT_MAX		G_GINT64_CONSTANT (1000000)
</pre>
<p>The PERCENT format is between 0 and this value</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-FORMAT-PERCENT-SCALE:CAPS"></a><h3>GST_FORMAT_PERCENT_SCALE</h3>
<pre class="programlisting">#define GST_FORMAT_PERCENT_SCALE G_GINT64_CONSTANT (10000)
</pre>
<p>The value used to scale down the reported PERCENT format value to
its real value.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFormatDefinition"></a><h3>struct GstFormatDefinition</h3>
<pre class="programlisting">struct GstFormatDefinition {
  GstFormat    value;
  const gchar *nick;
  const gchar *description;
  GQuark       quark;
};
</pre>
<p>A format definition</p>
<div class="refsect3">
<a name="id-1.3.19.8.5.5"></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="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> <em class="structfield"><code><a name="GstFormatDefinition.value"></a>value</code></em>;</p></td>
<td class="struct_member_description"><p>The unique id of this format</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GstFormatDefinition.nick"></a>nick</code></em>;</p></td>
<td class="struct_member_description"><p>A short nick of the format</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GstFormatDefinition.description"></a>description</code></em>;</p></td>
<td class="struct_member_description"><p>A longer description of the format</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> <em class="structfield"><code><a name="GstFormatDefinition.quark"></a>quark</code></em>;</p></td>
<td class="struct_member_description"><p>A quark for the nick</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-GstFormat.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a></p>
</div>
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