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<a href="#gst-plugins-base-libs-gstcddabasesrc.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#gst-plugins-base-libs-gstcddabasesrc.implemented-interfaces" class="shortcut">Implemented Interfaces</a>
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<a href="#gst-plugins-base-libs-gstcddabasesrc.properties" class="shortcut">Properties</a>
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<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 valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstcddabasesrc.synopsis"></a><h2>Synopsis</h2>
<a name="GstCddaBaseSrc"></a><pre class="synopsis">
#include <gst/cdda/gstcddabasesrc.h>
struct <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc-struct" title="struct GstCddaBaseSrc">GstCddaBaseSrc</a>;
struct <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcClass" title="struct GstCddaBaseSrcClass">GstCddaBaseSrcClass</a>;
struct <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcTrack" title="struct GstCddaBaseSrcTrack">GstCddaBaseSrcTrack</a>;
enum <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcMode" title="enum GstCddaBaseSrcMode">GstCddaBaseSrcMode</a>;
<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-gstcddabasesrc.html#gst-cdda-base-src-add-track" title="gst_cdda_base_src_add_track ()">gst_cdda_base_src_add_track</a> (<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>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html">GstObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html">GstElement</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstBaseSrc.html">GstBaseSrc</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstPushSrc.html">GstPushSrc</a>
+----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.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc--device" title='The "device" property'>device</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>* : Read / Write
"<a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc--mode" title='The "mode" property'>mode</a>" <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcMode" title="enum GstCddaBaseSrcMode"><span class="type">GstCddaBaseSrcMode</span></a> : Read / Write
"<a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc--track" title='The "track" property'>track</a>" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.description"></a><h2>Description</h2>
<p>
</p>
<div class="refsect2">
<a name="idp11955168"></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>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcddabasesrc.details"></a><h2>Details</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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">GstPushSrcClass</span> <em class="structfield"><code><a name="GstCddaBaseSrcClass.pushsrc-class"></a>pushsrc_class</code></em>;</span></p></td>
<td>the parent class</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstCddaBaseSrcClass.open"></a>open</code></em> ()</span></p></td>
<td>opening the device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstCddaBaseSrcClass.close"></a>close</code></em> ()</span></p></td>
<td>closing the device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstCddaBaseSrcClass.read-sector"></a>read_sector</code></em> ()</span></p></td>
<td>reading a sector</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstCddaBaseSrcClass.get-default-device"></a>get_default_device</code></em> ()</span></p></td>
<td>getting the default device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstCddaBaseSrcClass.probe-devices"></a>probe_devices</code></em> ()</span></p></td>
<td>probing possible devices</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Whether this is an audio track</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Track number in TOC (usually starts from 1, but not always)</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>The first sector of this track (LBA)</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>The last sector of this track (LBA)</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Track-specific tags (e.g. from cd-text information), or NULL</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCddaBaseSrcMode"></a><h3>enum GstCddaBaseSrcMode</h3>
<pre class="programlisting">typedef enum {
GST_CDDA_BASE_SRC_MODE_NORMAL, /* stream = one track */
GST_CDDA_BASE_SRC_MODE_CONTINUOUS /* stream = whole disc */
} GstCddaBaseSrcMode;
</pre>
<p>
Mode in which the CD audio source operates. Influences timestamping,
EOS handling and seeking.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-CDDA-BASE-SRC-MODE-NORMAL:CAPS"></a><span class="term"><code class="literal">GST_CDDA_BASE_SRC_MODE_NORMAL</code></span></p></td>
<td>each single track is a stream
</td>
</tr>
<tr>
<td><p><a name="GST-CDDA-BASE-SRC-MODE-CONTINUOUS:CAPS"></a><span class="term"><code class="literal">GST_CDDA_BASE_SRC_MODE_CONTINUOUS</code></span></p></td>
<td>the entire disc is a single stream
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<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="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 <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrc"><span class="type">GstCddaBaseSrc</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>address of <a class="link" href="gst-plugins-base-libs-gstcddabasesrc.html#GstCddaBaseSrcTrack" title="struct GstCddaBaseSrcTrack"><span class="type">GstCddaBaseSrcTrack</span></a> to add</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>FALSE on error, otherwise TRUE.</td>
</tr>
</tbody>
</table></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>* : Read / Write</pre>
<p>CD device location.</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> : Read / Write</pre>
<p>Mode.</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> : Read / Write</pre>
<p>Track.</p>
<p>Allowed values: [1,99]</p>
<p>Default value: 1</p>
</div>
</div>
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