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| <tr><td colspan="5" class="shortcuts"> |
| <a href="#gst-plugins-base-libs-gstaudiocdsrc.synopsis" class="shortcut">Top</a> |
| | |
| <a href="#gst-plugins-base-libs-gstaudiocdsrc.description" class="shortcut">Description</a> |
| | |
| <a href="#gst-plugins-base-libs-gstaudiocdsrc.object-hierarchy" class="shortcut">Object Hierarchy</a> |
| | |
| <a href="#gst-plugins-base-libs-gstaudiocdsrc.implemented-interfaces" class="shortcut">Implemented Interfaces</a> |
| | |
| <a href="#gst-plugins-base-libs-gstaudiocdsrc.properties" class="shortcut">Properties</a> |
| </td></tr> |
| </table> |
| <div class="refentry"> |
| <a name="gst-plugins-base-libs-gstaudiocdsrc"></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-gstaudiocdsrc.top_of_page"></a>gstaudiocdsrc</span></h2> |
| <p>gstaudiocdsrc — Base class for Audio CD sources</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsynopsisdiv"> |
| <a name="gst-plugins-base-libs-gstaudiocdsrc.synopsis"></a><h2>Synopsis</h2> |
| <a name="GstAudioCdSrc"></a><pre class="synopsis"> |
| #include <gst/audio/gstaudiocdsrc.h> |
| |
| struct <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrc-struct" title="struct GstAudioCdSrc">GstAudioCdSrc</a>; |
| struct <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrcClass" title="struct GstAudioCdSrcClass">GstAudioCdSrcClass</a>; |
| struct <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrcTrack" title="struct GstAudioCdSrcTrack">GstAudioCdSrcTrack</a>; |
| enum <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrcMode" title="enum GstAudioCdSrcMode">GstAudioCdSrcMode</a>; |
| <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#gst-audio-cd-src-add-track" title="gst_audio_cd_src_add_track ()">gst_audio_cd_src_add_track</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrc"><span class="type">GstAudioCdSrc</span></a> *src</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrcTrack" title="struct GstAudioCdSrcTrack"><span class="type">GstAudioCdSrcTrack</span></a> *track</code></em>); |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstaudiocdsrc.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="synopsis"> |
| <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a> |
| +----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> |
| +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a> |
| +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a> |
| +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html">GstBaseSrc</a> |
| +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstPushSrc.html">GstPushSrc</a> |
| +----GstAudioCdSrc |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstaudiocdsrc.implemented-interfaces"></a><h2>Implemented Interfaces</h2> |
| <p> |
| GstAudioCdSrc implements |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstUriHandler.html#GstURIHandler">GstURIHandler</a>.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstaudiocdsrc.properties"></a><h2>Properties</h2> |
| <pre class="synopsis"> |
| "<a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrc--device" title='The "device" property'>device</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>* : Read / Write |
| "<a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrc--mode" title='The "mode" property'>mode</a>" <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrcMode" title="enum GstAudioCdSrcMode"><span class="type">GstAudioCdSrcMode</span></a> : Read / Write |
| "<a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrc--track" title='The "track" property'>track</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> : Read / Write |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstaudiocdsrc.description"></a><h2>Description</h2> |
| <p> |
| </p> |
| <p> |
| Provides a base class for CD digital audio (CDDA) sources, which handles |
| things like seeking, querying, discid calculation, tags, and buffer |
| timestamping. |
| </p> |
| <p> |
| </p> |
| <div class="refsect2"> |
| <a name="idp52990624"></a><h3>Using GstAudioCdSrc-based elements in applications</h3> |
| <p> |
| GstAudioCdSrc registers two <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/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> |
| <div class="refsect2"><a name="idp58609728"></a></div> |
| <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> |
| <hr> |
| <div class="refsect2"> |
| <a name="idp58614736"></a><h3>Tracks and Table of Contents (TOC)</h3> |
| <p> |
| Applications will be informed of the available tracks via a TOC message |
| on the pipeline's <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html"><span class="type">GstBus</span></a>. The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstToc.html#GstToc"><span class="type">GstToc</span></a> will contain a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstToc.html#GstTocEntry"><span class="type">GstTocEntry</span></a> for |
| each track, with information about each track. The duration for each |
| track can be retrieved via the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GST-TAG-DURATION:CAPS"><span class="type">GST_TAG_DURATION</span></a> tag from each entry's |
| tag list, or calculated via <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstToc.html#gst-toc-entry-get-start-stop-times"><code class="function">gst_toc_entry_get_start_stop_times()</code></a>. |
| The track entries in the TOC will be sorted by track number. |
| </p> |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstaudiocdsrc.details"></a><h2>Details</h2> |
| <div class="refsect2"> |
| <a name="GstAudioCdSrc-struct"></a><h3>struct GstAudioCdSrc</h3> |
| <pre class="programlisting">struct GstAudioCdSrc;</pre> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioCdSrcClass"></a><h3>struct GstAudioCdSrcClass</h3> |
| <pre class="programlisting">struct GstAudioCdSrcClass { |
| GstPushSrcClass pushsrc_class; |
| |
| /* open/close the CD device */ |
| gboolean (*open) (GstAudioCdSrc *src, const gchar *device); |
| void (*close) (GstAudioCdSrc *src); |
| |
| /* read one sector (LBA) */ |
| GstBuffer * (*read_sector) (GstAudioCdSrc *src, gint sector); |
| |
| #if 0 |
| /* return default device or NULL (optional) */ |
| gchar * (*get_default_device) (GstAudioCdSrc *src); |
| |
| /* return NULL-terminated string array of CD devices, or NULL (optional) */ |
| /* FIXME 0.11: reconsider for new probing/device discovery API, remove if in doubt */ |
| gchar ** (*probe_devices) (GstAudioCdSrc *src); |
| #endif |
| }; |
| </pre> |
| <p> |
| Audio CD source base class. |
| </p> |
| <div class="variablelist"><table border="0" class="variablelist"> |
| <colgroup> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><span class="type">GstPushSrcClass</span> <em class="structfield"><code><a name="GstAudioCdSrcClass.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="GstAudioCdSrcClass.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="GstAudioCdSrcClass.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="GstAudioCdSrcClass.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="GstAudioCdSrcClass.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="GstAudioCdSrcClass.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="GstAudioCdSrcTrack"></a><h3>struct GstAudioCdSrcTrack</h3> |
| <pre class="programlisting">struct GstAudioCdSrcTrack { |
| 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> |
| <p> |
| This structure is only for use by sub-classed in connection with |
| <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#gst-audio-cd-src-add-track" title="gst_audio_cd_src_add_track ()"><code class="function">gst_audio_cd_src_add_track()</code></a>. |
| </p> |
| <p> |
| Applications will be informed of the available tracks via a TOC message |
| on the pipeline's <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html"><span class="type">GstBus</span></a> instead. |
| </p> |
| <div class="variablelist"><table border="0" class="variablelist"> |
| <colgroup> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstAudioCdSrcTrack.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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstAudioCdSrcTrack.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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstAudioCdSrcTrack.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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstAudioCdSrcTrack.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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *<em class="structfield"><code><a name="GstAudioCdSrcTrack.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="GstAudioCdSrcMode"></a><h3>enum GstAudioCdSrcMode</h3> |
| <pre class="programlisting">typedef enum { |
| GST_AUDIO_CD_SRC_MODE_NORMAL, /* stream = one track */ |
| GST_AUDIO_CD_SRC_MODE_CONTINUOUS /* stream = whole disc */ |
| } GstAudioCdSrcMode; |
| </pre> |
| <p> |
| Mode in which the CD audio source operates. Influences timestamping, |
| EOS handling and seeking. |
| </p> |
| <div class="variablelist"><table border="0" class="variablelist"> |
| <colgroup> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td><p><a name="GST-AUDIO-CD-SRC-MODE-NORMAL:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CD_SRC_MODE_NORMAL</code></span></p></td> |
| <td>each single track is a stream |
| </td> |
| </tr> |
| <tr> |
| <td><p><a name="GST-AUDIO-CD-SRC-MODE-CONTINUOUS:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CD_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-audio-cd-src-add-track"></a><h3>gst_audio_cd_src_add_track ()</h3> |
| <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_audio_cd_src_add_track (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrc"><span class="type">GstAudioCdSrc</span></a> *src</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrcTrack" title="struct GstAudioCdSrcTrack"><span class="type">GstAudioCdSrcTrack</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" class="variablelist"> |
| <colgroup> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <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-gstaudiocdsrc.html#GstAudioCdSrc"><span class="type">GstAudioCdSrc</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-gstaudiocdsrc.html#GstAudioCdSrcTrack" title="struct GstAudioCdSrcTrack"><span class="type">GstAudioCdSrcTrack</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-gstaudiocdsrc.property-details"></a><h2>Property Details</h2> |
| <div class="refsect2"> |
| <a name="GstAudioCdSrc--device"></a><h3>The <code class="literal">"device"</code> property</h3> |
| <pre class="programlisting"> "device" <a href="http://library.gnome.org/devel/glib/unstable/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="GstAudioCdSrc--mode"></a><h3>The <code class="literal">"mode"</code> property</h3> |
| <pre class="programlisting"> "mode" <a class="link" href="gst-plugins-base-libs-gstaudiocdsrc.html#GstAudioCdSrcMode" title="enum GstAudioCdSrcMode"><span class="type">GstAudioCdSrcMode</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="GstAudioCdSrc--track"></a><h3>The <code class="literal">"track"</code> property</h3> |
| <pre class="programlisting"> "track" <a href="http://library.gnome.org/devel/glib/unstable/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> |
| </div> |
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