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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>GStreamer Base Plugins 0.10 Library Reference Manual: gstcddabasesrc</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
<link rel="home" href="index.html" title="GStreamer Base Plugins 0.10 Library Reference Manual">
<link rel="up" href="gstreamer-cdda.html" title="CDDA Library">
<link rel="prev" href="gstreamer-cdda.html" title="CDDA Library">
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<meta name="generator" content="GTK-Doc V1.20 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="10"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstcddabasesrc.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstcddabasesrc.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_interfaces"> <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstcddabasesrc.implemented-interfaces" class="shortcut">Implemented Interfaces</a></span><span id="nav_properties"> <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstcddabasesrc.properties" class="shortcut">Properties</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="gstreamer-cdda.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="gstreamer-cdda.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="gstreamer-ffft.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstcddabasesrc"></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-gstcddabasesrc.top_of_page"></a>gstcddabasesrc</span></h2>
<p>gstcddabasesrc — Base class for CD digital audio (CDDA) sources</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.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/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-gstcddabasesrc.html#gst-cdda-base-src-add-track" title="gst_cdda_base_src_add_track ()">gst_cdda_base_src_add_track</a> <span class="c_punctuation">()</span>
</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc--device" title="The “device” property">device</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcMode" title="enum GstCddaBaseSrcMode"><span class="type">GstCddaBaseSrcMode</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc--mode" title="The “mode” property">mode</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc--track" title="The “track” property">track</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstCddaBaseSrc"></a><div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.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">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc-struct" title="struct GstCddaBaseSrc">GstCddaBaseSrc</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcClass" title="struct GstCddaBaseSrcClass">GstCddaBaseSrcClass</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcTrack" title="struct GstCddaBaseSrcTrack">GstCddaBaseSrcTrack</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcMode" title="enum GstCddaBaseSrcMode">GstCddaBaseSrcMode</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html">GstObject</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html">GstElement</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstBaseSrc.html">GstBaseSrc</a>
                <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstPushSrc.html">GstPushSrc</a>
                    <span class="lineart">╰──</span> GstCddaBaseSrc
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstCddaBaseSrc implements
 <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstUriHandler.html#GstURIHandler">GstURIHandler</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/cdda/gstcddabasesrc.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.description"></a><h2>Description</h2>
<div class="refsect2">
<a name="id-1.2.6.3.10.2"></a><h3>Using GstCddaBaseSrc-based elements in applications</h3>
<p>
Provides a base class for CDDA sources, which handles things like seeking,
querying, discid calculation, tags, and buffer timestamping.
</p>
<p>
GstCddaBaseSrc registers two <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a>s of its own, namely
the "track" format and the "sector" format. Applications will usually
only find the "track" format interesting. You can retrieve that <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstFormat.html#GstFormat"><span class="type">GstFormat</span></a>
for use in seek events or queries with gst_format_get_by_nick("track").
</p>
<p>
In order to query the number of tracks, for example, an application would
set the CDDA source element to READY or PAUSED state and then query the
the number of tracks via <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html#gst-element-query-duration"><code class="function">gst_element_query_duration()</code></a> using the track
format acquired above. Applications can query the currently playing track
in the same way.
</p>
<p>
Alternatively, applications may retrieve the currently playing track and
the total number of tracks from the taglist that will posted on the bus
whenever the CD is opened or the currently playing track changes. The
taglist will contain GST_TAG_TRACK_NUMBER and GST_TAG_TRACK_COUNT tags.
</p>
<p>
Applications playing back CD audio using playbin and cdda://n URIs should
issue a seek command in track format to change between tracks, rather than
setting a new cdda://n+1 URI on playbin (as setting a new URI on playbin
involves closing and re-opening the CD device, which is much much slower).
</p>
<p>
CDDA sources will automatically emit a number of tags, details about which
can be found in the libgsttag documentation. Those tags are:
<a class="link" href="gst-plugins-base-libs-gsttag.html#GST-TAG-CDDA-CDDB-DISCID:CAPS" title="GST_TAG_CDDA_CDDB_DISCID"><span class="type">GST_TAG_CDDA_CDDB_DISCID</span></a>, <a class="link" href="gst-plugins-base-libs-gsttag.html#GST-TAG-CDDA-CDDB-DISCID-FULL:CAPS" title="GST_TAG_CDDA_CDDB_DISCID_FULL"><span class="type">GST_TAG_CDDA_CDDB_DISCID_FULL</span></a>,
<a class="link" href="gst-plugins-base-libs-gsttag.html#GST-TAG-CDDA-MUSICBRAINZ-DISCID:CAPS" title="GST_TAG_CDDA_MUSICBRAINZ_DISCID"><span class="type">GST_TAG_CDDA_MUSICBRAINZ_DISCID</span></a>, <a class="link" href="gst-plugins-base-libs-gsttag.html#GST-TAG-CDDA-MUSICBRAINZ-DISCID-FULL:CAPS" title="GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL"><span class="type">GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL</span></a>,
among others.
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-cdda-base-src-add-track"></a><h3>gst_cdda_base_src_add_track ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_cdda_base_src_add_track (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc"><span class="type">GstCddaBaseSrc</span></a> *src</code></em>,
                             <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcTrack" title="struct GstCddaBaseSrcTrack"><span class="type">GstCddaBaseSrcTrack</span></a> *track</code></em>);</pre>
<p>CDDA sources use this function from their start vfunc to announce the
available data and audio tracks to the base source class. The caller
should allocate <em class="parameter"><code>track</code></em>
 on the stack, the base source will do a shallow
copy of the structure (and take ownership of the taglist if there is one).</p>
<div class="refsect3">
<a name="id-1.2.6.3.11.2.5"></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>src</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc"><span class="type">GstCddaBaseSrc</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>track</p></td>
<td class="parameter_description"><p>address of <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcTrack" title="struct GstCddaBaseSrcTrack"><span class="type">GstCddaBaseSrcTrack</span></a> to add</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.3.11.2.6"></a><h4>Returns</h4>
<p> FALSE on error, otherwise TRUE.</p>
<p></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstCddaBaseSrc-struct"></a><h3>struct GstCddaBaseSrc</h3>
<pre class="programlisting">struct GstCddaBaseSrc;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstCddaBaseSrcClass"></a><h3>struct GstCddaBaseSrcClass</h3>
<pre class="programlisting">struct GstCddaBaseSrcClass {
  GstPushSrcClass pushsrc_class;

  /* open/close the CD device */
  gboolean    (*open)               (GstCddaBaseSrc *src, const gchar *device);
  void        (*close)              (GstCddaBaseSrc *src);

  /* read one sector (LBA) */
  GstBuffer * (*read_sector)        (GstCddaBaseSrc *src, gint sector);

  /* return default device or NULL (optional) */
  gchar *     (*get_default_device) (GstCddaBaseSrc *src);

  /* return NULL-terminated string array of CD devices, or NULL (optional) */
  gchar **    (*probe_devices)      (GstCddaBaseSrc *src);
};
</pre>
<p>Cdda source base class.</p>
<div class="refsect3">
<a name="id-1.2.6.3.12.3.5"></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><span class="type">GstPushSrcClass</span> <em class="structfield"><code><a name="GstCddaBaseSrcClass.pushsrc-class"></a>pushsrc_class</code></em>;</p></td>
<td class="struct_member_description"><p>the parent class</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstCddaBaseSrcClass.open"></a>open</code></em> ()</p></td>
<td class="struct_member_description"><p>opening the device</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstCddaBaseSrcClass.close"></a>close</code></em> ()</p></td>
<td class="struct_member_description"><p>closing the device</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstCddaBaseSrcClass.read-sector"></a>read_sector</code></em> ()</p></td>
<td class="struct_member_description"><p>reading a sector</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstCddaBaseSrcClass.get-default-device"></a>get_default_device</code></em> ()</p></td>
<td class="struct_member_description"><p>getting the default device</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstCddaBaseSrcClass.probe-devices"></a>probe_devices</code></em> ()</p></td>
<td class="struct_member_description"><p>probing possible devices</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstCddaBaseSrcTrack"></a><h3>struct GstCddaBaseSrcTrack</h3>
<pre class="programlisting">struct GstCddaBaseSrcTrack {
  gboolean     is_audio;      /* TRUE if this is an audio track             */
  guint        num;           /* real track number (usually starts from 1)  */
  guint        start;         /* first sector of track (LBA, not LSN!)      */
  guint        end;           /* last sector of track  (LBA, not LSN!)      */
  GstTagList  *tags;          /* NULL or tags for track (e.g. from cd-text) */
};
</pre>
<p>CD track abstraction to communicate TOC entries to the base class.</p>
<div class="refsect3">
<a name="id-1.2.6.3.12.4.5"></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 href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstCddaBaseSrcTrack.is-audio"></a>is_audio</code></em>;</p></td>
<td class="struct_member_description"><p>Whether this is an audio track</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-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstCddaBaseSrcTrack.num"></a>num</code></em>;</p></td>
<td class="struct_member_description"><p>Track number in TOC (usually starts from 1, but not always)</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-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstCddaBaseSrcTrack.start"></a>start</code></em>;</p></td>
<td class="struct_member_description"><p>The first sector of this track (LBA)</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-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstCddaBaseSrcTrack.end"></a>end</code></em>;</p></td>
<td class="struct_member_description"><p>The last sector of this track (LBA)</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *<em class="structfield"><code><a name="GstCddaBaseSrcTrack.tags"></a>tags</code></em>;</p></td>
<td class="struct_member_description"><p>Track-specific tags (e.g. from cd-text information), or NULL</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstCddaBaseSrcMode"></a><h3>enum GstCddaBaseSrcMode</h3>
<p>Mode in which the CD audio source operates. Influences timestamping,
EOS handling and seeking.</p>
<div class="refsect3">
<a name="id-1.2.6.3.12.5.4"></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-CDDA-BASE-SRC-MODE-NORMAL:CAPS"></a>GST_CDDA_BASE_SRC_MODE_NORMAL</p></td>
<td class="enum_member_description">
<p>each single track is a stream</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-CDDA-BASE-SRC-MODE-CONTINUOUS:CAPS"></a>GST_CDDA_BASE_SRC_MODE_CONTINUOUS</p></td>
<td class="enum_member_description">
<p>the entire disc is a single stream</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstCddaBaseSrc--device"></a><h3>The <code class="literal">“device”</code> property</h3>
<pre class="programlisting">  “device”                   <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>CD device location.</p>
<p>Flags: Read / Write</p>
<p>Default value: NULL</p>
</div>
<hr>
<div class="refsect2">
<a name="GstCddaBaseSrc--mode"></a><h3>The <code class="literal">“mode”</code> property</h3>
<pre class="programlisting">  “mode”                     <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcMode" title="enum GstCddaBaseSrcMode"><span class="type">GstCddaBaseSrcMode</span></a></pre>
<p>Mode.</p>
<p>Flags: Read / Write</p>
<p>Default value: Stream consists of a single track</p>
</div>
<hr>
<div class="refsect2">
<a name="GstCddaBaseSrc--track"></a><h3>The <code class="literal">“track”</code> property</h3>
<pre class="programlisting">  “track”                    <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Track.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [1,99]</p>
<p>Default value: 1</p>
</div>
</div>
</div>
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