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| <div class="refentry"> |
| <a name="GstTypeFindFactory"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="GstTypeFindFactory.top_of_page"></a>GstTypeFindFactory</span></h2> |
| <p>GstTypeFindFactory — Information about registered typefind functions</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="GstTypeFindFactory.functions"></a><h2>Functions</h2> |
| <div class="informaltable"><table class="informaltable" 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/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GstTypeFindFactory.html#gst-type-find-factory-get-list" title="gst_type_find_factory_get_list ()">gst_type_find_factory_get_list</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * const * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GstTypeFindFactory.html#gst-type-find-factory-get-extensions" title="gst_type_find_factory_get_extensions ()">gst_type_find_factory_get_extensions</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a class="link" href="GstCaps.html" title="GstCaps"><span class="returnvalue">GstCaps</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GstTypeFindFactory.html#gst-type-find-factory-get-caps" title="gst_type_find_factory_get_caps ()">gst_type_find_factory_get_caps</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GstTypeFindFactory.html#gst-type-find-factory-has-function" title="gst_type_find_factory_has_function ()">gst_type_find_factory_has_function</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="GstTypeFindFactory.html#gst-type-find-factory-call-function" title="gst_type_find_factory_call_function ()">gst_type_find_factory_call_function</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="GstTypeFindFactory.other"></a><h2>Types and Values</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="name"> |
| <col class="description"> |
| </colgroup> |
| <tbody><tr> |
| <td class="datatype_keyword"> </td> |
| <td class="function_name"><a class="link" href="GstTypeFindFactory.html#GstTypeFindFactory-struct" title="GstTypeFindFactory">GstTypeFindFactory</a></td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="GstTypeFindFactory.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="screen"> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct">GObject</a> |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> |
| <span class="lineart">╰──</span> <a class="link" href="GstObject.html" title="GstObject">GstObject</a> |
| <span class="lineart">╰──</span> <a class="link" href="GstPluginFeature.html" title="GstPluginFeature">GstPluginFeature</a> |
| <span class="lineart">╰──</span> GstTypeFindFactory |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="GstTypeFindFactory.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gst/gst.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="GstTypeFindFactory.description"></a><h2>Description</h2> |
| <p>These functions allow querying informations about registered typefind |
| functions. How to create and register these functions is described in |
| the section <GTKDOCLINK HREF="gstreamer-Writing-typefind-functions"> |
| "Writing typefind functions"</GTKDOCLINK>.</p> |
| <p>The following example shows how to write a very simple typefinder that |
| identifies the given data. You can get quite a bit more complicated than |
| that though.</p> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1 |
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| 39</pre></td> |
| <td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwc">typedef</span> <span class="gtkdoc kwb">struct</span> <span class="gtkdoc opt">{</span> |
| guint8 <span class="gtkdoc opt">*</span>data<span class="gtkdoc opt">;</span> |
| guint size<span class="gtkdoc opt">;</span> |
| guint probability<span class="gtkdoc opt">;</span> |
| GstCaps <span class="gtkdoc opt">*</span>data<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> MyTypeFind<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc kwb">static void</span> |
| <span class="function">my_peek</span> <span class="gtkdoc opt">(</span>gpointer data<span class="gtkdoc opt">,</span> gint64 offset<span class="gtkdoc opt">,</span> guint size<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| MyTypeFind <span class="gtkdoc opt">*</span>find <span class="gtkdoc opt">= (</span>MyTypeFind <span class="gtkdoc opt">*)</span> data<span class="gtkdoc opt">;</span> |
| <span class="keyword">if</span> <span class="gtkdoc opt">(</span>offset <span class="gtkdoc opt">>=</span> <span class="number">0</span> <span class="gtkdoc opt">&&</span> offset <span class="gtkdoc opt">+</span> size <span class="gtkdoc opt"><=</span> find<span class="gtkdoc opt">-></span>size<span class="gtkdoc opt">) {</span> |
| <span class="keyword">return</span> find<span class="gtkdoc opt">-></span>data <span class="gtkdoc opt">+</span> offset<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="keyword">return</span> NULL<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc kwb">static void</span> |
| <span class="function">my_suggest</span> <span class="gtkdoc opt">(</span>gpointer data<span class="gtkdoc opt">,</span> guint probability<span class="gtkdoc opt">,</span> GstCaps <span class="gtkdoc opt">*</span>caps<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| MyTypeFind <span class="gtkdoc opt">*</span>find <span class="gtkdoc opt">= (</span>MyTypeFind <span class="gtkdoc opt">*)</span> data<span class="gtkdoc opt">;</span> |
| <span class="keyword">if</span> <span class="gtkdoc opt">(</span>probability <span class="gtkdoc opt">></span> find<span class="gtkdoc opt">-></span>probability<span class="gtkdoc opt">) {</span> |
| find<span class="gtkdoc opt">-></span>probability <span class="gtkdoc opt">=</span> probability<span class="gtkdoc opt">;</span> |
| <span class="function"><a href="GstCaps.html#gst-caps-replace">gst_caps_replace</a></span> <span class="gtkdoc opt">(&</span>find<span class="gtkdoc opt">-></span>caps<span class="gtkdoc opt">,</span> caps<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="gtkdoc kwb">static</span> GstCaps <span class="gtkdoc opt">*</span> |
| <span class="function">find_type</span> <span class="gtkdoc opt">(</span>guint8 <span class="gtkdoc opt">*</span>data<span class="gtkdoc opt">,</span> guint size<span class="gtkdoc opt">)</span> |
| <span class="gtkdoc opt">{</span> |
| GList <span class="gtkdoc opt">*</span>walk<span class="gtkdoc opt">, *</span>type_list<span class="gtkdoc opt">;</span> |
| MyTypeFind find <span class="gtkdoc opt">= {</span>data<span class="gtkdoc opt">,</span> size<span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">};</span> |
| GstTypeFind gst_find <span class="gtkdoc opt">= {</span>my_peek<span class="gtkdoc opt">,</span> my_suggest<span class="gtkdoc opt">, &</span>find<span class="gtkdoc opt">, };</span> |
| walk <span class="gtkdoc opt">=</span> type_list <span class="gtkdoc opt">=</span> <span class="function"><a href="GstTypeFindFactory.html#gst-type-find-factory-get-list">gst_type_find_factory_get_list</a></span> <span class="gtkdoc opt">();</span> |
| <span class="keyword">while</span> <span class="gtkdoc opt">(</span>walk<span class="gtkdoc opt">) {</span> |
| GstTypeFindFactory <span class="gtkdoc opt">*</span>factory <span class="gtkdoc opt">=</span> <span class="function">GST_TYPE_FIND_FACTORY</span> <span class="gtkdoc opt">(</span>walk<span class="gtkdoc opt">-></span>data<span class="gtkdoc opt">);</span> |
| walk <span class="gtkdoc opt">=</span> <span class="function"><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#g-list-next">g_list_next</a></span> <span class="gtkdoc opt">(</span>walk<span class="gtkdoc opt">)</span> |
| <span class="function"><a href="GstTypeFindFactory.html#gst-type-find-factory-call-function">gst_type_find_factory_call_function</a></span> <span class="gtkdoc opt">(</span>factory<span class="gtkdoc opt">, &</span>gst_find<span class="gtkdoc opt">);</span> |
| <span class="gtkdoc opt">}</span> |
| <span class="function"><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#g-list-free">g_list_free</a></span> <span class="gtkdoc opt">(</span>type_list<span class="gtkdoc opt">);</span> |
| <span class="keyword">return</span> find<span class="gtkdoc opt">.</span>caps<span class="gtkdoc opt">;</span> |
| <span class="gtkdoc opt">};</span></pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| |
| <p></p> |
| </div> |
| <div class="refsect1"> |
| <a name="GstTypeFindFactory.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="gst-type-find-factory-get-list"></a><h3>gst_type_find_factory_get_list ()</h3> |
| <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * |
| gst_type_find_factory_get_list (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> |
| <p>Gets the list of all registered typefind factories. You must free the |
| list using <a class="link" href="GstPluginFeature.html#gst-plugin-feature-list-free" title="gst_plugin_feature_list_free ()"><code class="function">gst_plugin_feature_list_free()</code></a>.</p> |
| <p>The returned factories are sorted by highest rank first, and then by |
| factory name.</p> |
| <p>Free-function: gst_plugin_feature_list_free</p> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-get-list.returns"></a><h4>Returns</h4> |
| <p> the list of all |
| registered <a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a>. </p> |
| <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.TypeFindFactory]</span></p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-type-find-factory-get-extensions"></a><h3>gst_type_find_factory_get_extensions ()</h3> |
| <pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * const * |
| gst_type_find_factory_get_extensions (<em class="parameter"><code><a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a> *factory</code></em>);</pre> |
| <p>Gets the extensions associated with a <a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a>. The returned |
| array should not be changed. If you need to change stuff in it, you should |
| copy it using <a href="/usr/share/gtk-doc/html/glibglib-String-Utility-Functions.html#g-strdupv"><code class="function">g_strdupv()</code></a>. This function may return <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to indicate |
| a 0-length list.</p> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-get-extensions.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>factory</p></td> |
| <td class="parameter_description"><p>A <a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-get-extensions.returns"></a><h4>Returns</h4> |
| <p> a <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated array of extensions associated with this factory. </p> |
| <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> utf8][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-type-find-factory-get-caps"></a><h3>gst_type_find_factory_get_caps ()</h3> |
| <pre class="programlisting"><a class="link" href="GstCaps.html" title="GstCaps"><span class="returnvalue">GstCaps</span></a> * |
| gst_type_find_factory_get_caps (<em class="parameter"><code><a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a> *factory</code></em>);</pre> |
| <p>Gets the <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> associated with a typefind factory.</p> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-get-caps.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>factory</p></td> |
| <td class="parameter_description"><p>A <a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-get-caps.returns"></a><h4>Returns</h4> |
| <p> the <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> associated with this factory. </p> |
| <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-type-find-factory-has-function"></a><h3>gst_type_find_factory_has_function ()</h3> |
| <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> |
| gst_type_find_factory_has_function (<em class="parameter"><code><a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a> *factory</code></em>);</pre> |
| <p>Check whether the factory has a typefind function. Typefind factories |
| without typefind functions are a last-effort fallback mechanism to |
| e.g. assume a certain media type based on the file extension.</p> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-has-function.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>factory</p></td> |
| <td class="parameter_description"><p>A <a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-has-function.returns"></a><h4>Returns</h4> |
| <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the factory has a typefind functions set, otherwise <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a></p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-type-find-factory-call-function"></a><h3>gst_type_find_factory_call_function ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_type_find_factory_call_function (<em class="parameter"><code><a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a> *factory</code></em>, |
| <em class="parameter"><code><a class="link" href="gstreamer-GstTypeFind.html#GstTypeFind" title="struct GstTypeFind"><span class="type">GstTypeFind</span></a> *find</code></em>);</pre> |
| <p>Calls the <a class="link" href="gstreamer-GstTypeFind.html#GstTypeFindFunction" title="GstTypeFindFunction ()"><span class="type">GstTypeFindFunction</span></a> associated with this factory.</p> |
| <div class="refsect3"> |
| <a name="gst-type-find-factory-call-function.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" 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>factory</p></td> |
| <td class="parameter_description"><p>A <a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory"><span class="type">GstTypeFindFactory</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>find</p></td> |
| <td class="parameter_description"><p> a properly setup <a class="link" href="gstreamer-GstTypeFind.html#GstTypeFind" title="struct GstTypeFind"><span class="type">GstTypeFind</span></a> entry. The get_data |
| and suggest_type members must be set. </p></td> |
| <td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="GstTypeFindFactory.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstTypeFindFactory-struct"></a><h3>GstTypeFindFactory</h3> |
| <pre class="programlisting">typedef struct _GstTypeFindFactory GstTypeFindFactory;</pre> |
| <p>Opaque object that stores information about a typefind function.</p> |
| </div> |
| </div> |
| </div> |
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