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<a href="#gst-plugins-base-libs-gstmixer.signals" class="shortcut">Signals</a>
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<a name="gst-plugins-base-libs-gstmixer"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstmixer.top_of_page"></a>gstmixer</span></h2>
<p>gstmixer — Interface for elements that provide mixer operations</p>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstmixer.synopsis"></a><h2>Synopsis</h2>
<a name="GstMixer"></a><pre class="synopsis">
#include <gst/interfaces/mixer.h>
<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer-struct" title="GstMixer">GstMixer</a>;
enum <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerType" title="enum GstMixerType">GstMixerType</a>;
enum <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerFlags" title="enum GstMixerFlags">GstMixerFlags</a>;
enum <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerMessageType" title="enum GstMixerMessageType">GstMixerMessageType</a>;
const <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-list-tracks" title="gst_mixer_list_tracks ()">gst_mixer_list_tracks</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-get-volume" title="gst_mixer_get_volume ()">gst_mixer_get_volume</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *volumes</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-set-volume" title="gst_mixer_set_volume ()">gst_mixer_set_volume</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *volumes</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-set-mute" title="gst_mixer_set_mute ()">gst_mixer_set_mute</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> mute</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-set-record" title="gst_mixer_set_record ()">gst_mixer_set_record</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> record</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-set-option" title="gst_mixer_set_option ()">gst_mixer_set_option</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-mute-toggled" title="gst_mixer_mute_toggled ()">gst_mixer_mute_toggled</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> mute</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-record-toggled" title="gst_mixer_record_toggled ()">gst_mixer_record_toggled</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> record</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-volume-changed" title="gst_mixer_volume_changed ()">gst_mixer_volume_changed</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *volumes</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-option-changed" title="gst_mixer_option_changed ()">gst_mixer_option_changed</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</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> *value</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-options-list-changed" title="gst_mixer_options_list_changed ()">gst_mixer_options_list_changed</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</code></em>);
const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-get-option" title="gst_mixer_get_option ()">gst_mixer_get_option</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-mixer-changed" title="gst_mixer_mixer_changed ()">gst_mixer_mixer_changed</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);
<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerFlags" title="enum GstMixerFlags"><span class="returnvalue">GstMixerFlags</span></a> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-get-mixer-flags" title="gst_mixer_get_mixer_flags ()">gst_mixer_get_mixer_flags</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);
<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerType" title="enum GstMixerType"><span class="returnvalue">GstMixerType</span></a> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-get-mixer-type" title="gst_mixer_get_mixer_type ()">gst_mixer_get_mixer_type</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);
<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerMessageType" title="enum GstMixerMessageType"><span class="returnvalue">GstMixerMessageType</span></a> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-message-get-type" title="gst_mixer_message_get_type ()">gst_mixer_message_get_type</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-message-parse-mute-toggled" title="gst_mixer_message_parse_mute_toggled ()">gst_mixer_message_parse_mute_toggled</a>
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> **track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *mute</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-message-parse-option-changed" title="gst_mixer_message_parse_option_changed ()">gst_mixer_message_parse_option_changed</a>
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> **options</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> **value</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-message-parse-record-toggled" title="gst_mixer_message_parse_record_toggled ()">gst_mixer_message_parse_record_toggled</a>
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> **track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *record</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-message-parse-volume-changed" title="gst_mixer_message_parse_volume_changed ()">gst_mixer_message_parse_volume_changed</a>
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> **track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> **volumes</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *num_channels</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstmixer.html#gst-mixer-message-parse-options-list-changed" title="gst_mixer_message_parse_options_list_changed ()">gst_mixer_message_parse_options_list_changed</a>
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> **options</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstmixer.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GInterface
+----GstMixer
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstmixer.prerequisites"></a><h2>Prerequisites</h2>
<p>
GstMixer requires
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstImplementsInterface.html">GstImplementsInterface</a> and <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html">GstElement</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstmixer.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer-mute-toggled" title='The "mute-toggled" signal'>mute-toggled</a>" : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer-option-changed" title='The "option-changed" signal'>option-changed</a>" : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer-record-toggled" title='The "record-toggled" signal'>record-toggled</a>" : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer-volume-changed" title='The "volume-changed" signal'>volume-changed</a>" : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstmixer.description"></a><h2>Description</h2>
<p>
Basic interface for hardware mixer controls.
</p>
<p>
Applications rarely need to use this interface, it is provided mainly
for system-level mixer applets and the like. Volume control in playback
applications should be done using a <code class="classname">volume</code>
element or, if available, using the <span class="quote">“<span class="quote">volume</span>”</span> property of
the audio sink element used (as provided by <code class="classname">pulsesink</code>
for example), or even better: just use the <code class="classname">playbin2</code>
element's <span class="quote">“<span class="quote">volume</span>”</span> property.
</p>
<p>
Usage: In order to use the <code class="classname">GstMixer</code> interface, the
element needs to be at least in READY state (so that the element has opened
the mixer device). Once the element has been set to READY state or higher,
it can be cast to a <code class="classname">GstMixer</code> using the GST_MIXER
macro (in C) and the mixer API can be used.
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstmixer.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstMixer-struct"></a><h3>GstMixer</h3>
<pre class="programlisting">typedef struct _GstMixer GstMixer;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstMixerType"></a><h3>enum GstMixerType</h3>
<pre class="programlisting">typedef enum {
GST_MIXER_HARDWARE,
GST_MIXER_SOFTWARE
} GstMixerType;
</pre>
<p>
Mixer classification.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-MIXER-HARDWARE:CAPS"></a><span class="term"><code class="literal">GST_MIXER_HARDWARE</code></span></p></td>
<td>mixing is implemented with dedicated hardware.
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-SOFTWARE:CAPS"></a><span class="term"><code class="literal">GST_MIXER_SOFTWARE</code></span></p></td>
<td>mixing is implemented via software processing.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstMixerFlags"></a><h3>enum GstMixerFlags</h3>
<pre class="programlisting">typedef enum {
GST_MIXER_FLAG_NONE = 0,
GST_MIXER_FLAG_AUTO_NOTIFICATIONS = (1<<0),
GST_MIXER_FLAG_HAS_WHITELIST = (1<<1),
GST_MIXER_FLAG_GROUPING = (1<<2),
} GstMixerFlags;
</pre>
<p>
Flags indicating which optional features are supported by a mixer
implementation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-MIXER-FLAG-NONE:CAPS"></a><span class="term"><code class="literal">GST_MIXER_FLAG_NONE</code></span></p></td>
<td>No flags
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-FLAG-AUTO-NOTIFICATIONS:CAPS"></a><span class="term"><code class="literal">GST_MIXER_FLAG_AUTO_NOTIFICATIONS</code></span></p></td>
<td>The mixer implementation automatically
sends notification messages.
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-FLAG-HAS-WHITELIST:CAPS"></a><span class="term"><code class="literal">GST_MIXER_FLAG_HAS_WHITELIST</code></span></p></td>
<td>The mixer implementation flags tracks that
should be displayed by default (whitelisted). Since: 0.10.23
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-FLAG-GROUPING:CAPS"></a><span class="term"><code class="literal">GST_MIXER_FLAG_GROUPING</code></span></p></td>
<td>The mixer implementation will leave some controls
marked without either input or output. Controls marked as input or
output should be grouped with input & output sliders, even if they
are options or bare switches. Since: 0.10.23
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.14</p>
</div>
<hr>
<div class="refsect2">
<a name="GstMixerMessageType"></a><h3>enum GstMixerMessageType</h3>
<pre class="programlisting">typedef enum {
GST_MIXER_MESSAGE_INVALID,
GST_MIXER_MESSAGE_MUTE_TOGGLED,
GST_MIXER_MESSAGE_RECORD_TOGGLED,
GST_MIXER_MESSAGE_VOLUME_CHANGED,
GST_MIXER_MESSAGE_OPTION_CHANGED,
GST_MIXER_MESSAGE_OPTIONS_LIST_CHANGED,
GST_MIXER_MESSAGE_MIXER_CHANGED
} GstMixerMessageType;
</pre>
<p>
An enumeration for the type of a GstMixer message received on the bus
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-MIXER-MESSAGE-INVALID:CAPS"></a><span class="term"><code class="literal">GST_MIXER_MESSAGE_INVALID</code></span></p></td>
<td>Not a GstMixer message
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-MESSAGE-MUTE-TOGGLED:CAPS"></a><span class="term"><code class="literal">GST_MIXER_MESSAGE_MUTE_TOGGLED</code></span></p></td>
<td>A mute-toggled GstMixer message
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-MESSAGE-RECORD-TOGGLED:CAPS"></a><span class="term"><code class="literal">GST_MIXER_MESSAGE_RECORD_TOGGLED</code></span></p></td>
<td>A record-toggled GstMixer message
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-MESSAGE-VOLUME-CHANGED:CAPS"></a><span class="term"><code class="literal">GST_MIXER_MESSAGE_VOLUME_CHANGED</code></span></p></td>
<td>A volume-changed GstMixer message
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-MESSAGE-OPTION-CHANGED:CAPS"></a><span class="term"><code class="literal">GST_MIXER_MESSAGE_OPTION_CHANGED</code></span></p></td>
<td>An option-changed GstMixer message
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-MESSAGE-OPTIONS-LIST-CHANGED:CAPS"></a><span class="term"><code class="literal">GST_MIXER_MESSAGE_OPTIONS_LIST_CHANGED</code></span></p></td>
<td>An options-list-changed
GstMixer message, posted when the list of available options for a
GstMixerOptions object has changed (Since: 0.10.18)
</td>
</tr>
<tr>
<td><p><a name="GST-MIXER-MESSAGE-MIXER-CHANGED:CAPS"></a><span class="term"><code class="literal">GST_MIXER_MESSAGE_MIXER_CHANGED</code></span></p></td>
<td>A mixer-changed GstMixer message, posted
when the list of available mixer tracks has changed. The application
should re-build its interface in this case (Since: 0.10.18)
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.14</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-list-tracks"></a><h3>gst_mixer_list_tracks ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * gst_mixer_list_tracks (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);</pre>
<p>
Returns a list of available tracks for this mixer/element. Note
that it is allowed for sink (output) elements to only provide
the output tracks in this list. Likewise, for sources (inputs),
it is allowed to only provide input elements in this list.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) to get the tracks from.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> consisting of zero or more <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTracks</span></a>.
The list is owned by the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> instance and must not be freed
or modified.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-get-volume"></a><h3>gst_mixer_get_volume ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_get_volume (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *volumes</code></em>);</pre>
<p>
Get the current volume(s) on the given track.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the track</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>the GstMixerTrack to get the volume from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>volumes</code></em> :</span></p></td>
<td>a pre-allocated array of integers (of size
track->num_channels) to store the current volume
of each channel in the given track in.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-set-volume"></a><h3>gst_mixer_set_volume ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_set_volume (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *volumes</code></em>);</pre>
<p>
Sets the volume on each channel in a track. Short note about
naming: a track is defined as one separate stream owned by
the mixer/element, such as 'Line-in' or 'Microphone'. A
channel is said to be a mono-stream inside this track. A
stereo track thus contains two channels.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the track.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> to set the volume on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>volumes</code></em> :</span></p></td>
<td>an array of integers (of size track->num_channels)
that gives the wanted volume for each channel in
this track.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-set-mute"></a><h3>gst_mixer_set_mute ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_set_mute (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> mute</code></em>);</pre>
<p>
Mutes or unmutes the given channel. To find out whether a
track is currently muted, use <a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GST-MIXER-TRACK-HAS-FLAG:CAPS" title="GST_MIXER_TRACK_HAS_FLAG()"><code class="function">GST_MIXER_TRACK_HAS_FLAG()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the track.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> to operate on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mute</code></em> :</span></p></td>
<td>a boolean value indicating whether to turn on or off
muting.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-set-record"></a><h3>gst_mixer_set_record ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_set_record (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> record</code></em>);</pre>
<p>
Enables or disables recording on the given track. Note that
this is only possible on input tracks, not on output tracks
(see <a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GST-MIXER-TRACK-HAS-FLAG:CAPS" title="GST_MIXER_TRACK_HAS_FLAG()"><code class="function">GST_MIXER_TRACK_HAS_FLAG()</code></a> and the GST_MIXER_TRACK_INPUT
flag).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the track.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> to operate on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>record</code></em> :</span></p></td>
<td>a boolean value that indicates whether to turn on
or off recording.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-set-option"></a><h3>gst_mixer_set_option ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_set_option (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
<p>
Sets a name/value option in the mixer to the requested value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the optionlist.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>opts</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> that we operate on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>The requested new option value.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-mute-toggled"></a><h3>gst_mixer_mute_toggled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_mute_toggled (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> mute</code></em>);</pre>
<p>
This function is called by the mixer implementation to produce
a notification message on the bus indicating that the given track
has changed mute state.
</p>
<p>
This function only works for GstElements that are implementing the
GstMixer interface, and the element needs to have been provided a bus.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the track</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>the GstMixerTrack that has change mute state.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mute</code></em> :</span></p></td>
<td>the new state of the mute flag on the track</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-record-toggled"></a><h3>gst_mixer_record_toggled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_record_toggled (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> record</code></em>);</pre>
<p>
This function is called by the mixer implementation to produce
a notification message on the bus indicating that the given track
has changed recording state.
</p>
<p>
This function only works for GstElements that are implementing the
GstMixer interface, and the element needs to have been provided a bus.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the track</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>the GstMixerTrack that has changed recording state.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>record</code></em> :</span></p></td>
<td>the new state of the record flag on the track</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-volume-changed"></a><h3>gst_mixer_volume_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_volume_changed (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *volumes</code></em>);</pre>
<p>
This function is called by the mixer implementation to produce
a notification message on the bus indicating that the volume(s) for the
given track have changed.
</p>
<p>
This function only works for GstElements that are implementing the
GstMixer interface, and the element needs to have been provided a bus.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the track</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>the GstMixerTrack that has changed.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>volumes</code></em> :</span></p></td>
<td>Array of volume values, one per channel on the mixer track.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-option-changed"></a><h3>gst_mixer_option_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_option_changed (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</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> *value</code></em>);</pre>
<p>
This function is called by the mixer implementation to produce
a notification message on the bus indicating that the given options
object has changed state.
</p>
<p>
This function only works for GstElements that are implementing the
GstMixer interface, and the element needs to have been provided a bus.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the options</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>opts</code></em> :</span></p></td>
<td>the GstMixerOptions that has changed value.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>the new value of the GstMixerOptions.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-options-list-changed"></a><h3>gst_mixer_options_list_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_options_list_changed (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</code></em>);</pre>
<p>
This function is called by the mixer implementation to produce
a notification message on the bus indicating that the list of possible
options of a given options object has changed.
</p>
<p>
The new options are not contained in the message on purpose. Applications
should call <a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#gst-mixer-options-get-values" title="gst_mixer_options_get_values ()"><code class="function">gst_mixer_options_get_values()</code></a> on <em class="parameter"><code>opts</code></em> to make <em class="parameter"><code>opts</code></em> update
its internal state and obtain the new list of values.
</p>
<p>
This function only works for GstElements that are implementing the
GstMixer interface, and the element needs to have been provided a bus
for this to work.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the options</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>opts</code></em> :</span></p></td>
<td>the GstMixerOptions whose list of values has changed</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-get-option"></a><h3>gst_mixer_get_option ()</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_mixer_get_option (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *opts</code></em>);</pre>
<p>
Get the current value of a name/value option in the mixer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) that owns the optionlist.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>opts</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> that we operate on.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>current value of the name/value option.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-mixer-changed"></a><h3>gst_mixer_mixer_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_mixer_changed (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);</pre>
<p>
This function is called by the mixer implementation to produce
a notification message on the bus indicating that the list of available
mixer tracks for a given mixer object has changed. Applications should
rebuild their interface when they receive this message.
</p>
<p>
This function only works for GstElements that are implementing the
GstMixer interface, and the element needs to have been provided a bus.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> (a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html"><span class="type">GstElement</span></a>) which has changed</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-get-mixer-flags"></a><h3>gst_mixer_get_mixer_flags ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerFlags" title="enum GstMixerFlags"><span class="returnvalue">GstMixerFlags</span></a> gst_mixer_get_mixer_flags (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);</pre>
<p>
Get the set of supported flags for this mixer implementation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> implementation</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A set of or-ed GstMixerFlags for supported features.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-get-mixer-type"></a><h3>gst_mixer_get_mixer_type ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerType" title="enum GstMixerType"><span class="returnvalue">GstMixerType</span></a> gst_mixer_get_mixer_type (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *mixer</code></em>);</pre>
<p>
Get the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerType" title="enum GstMixerType"><span class="type">GstMixerType</span></a> of this mixer implementation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mixer</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> implementation</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A the <a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerType" title="enum GstMixerType"><span class="type">GstMixerType</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.24</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-message-get-type"></a><h3>gst_mixer_message_get_type ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixerMessageType" title="enum GstMixerMessageType"><span class="returnvalue">GstMixerMessageType</span></a> gst_mixer_message_get_type (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);</pre>
<p>
Check a bus message to see if it is a GstMixer notification
message and return the GstMixerMessageType identifying which
type of notification it is.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A GstMessage to inspect.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The type of the GstMixerMessage, or GST_MIXER_MESSAGE_INVALID
if the message is not a GstMixer notification.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.14</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-message-parse-mute-toggled"></a><h3>gst_mixer_message_parse_mute_toggled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_message_parse_mute_toggled
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> **track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *mute</code></em>);</pre>
<p>
Extracts the contents of a mute-toggled bus message. Reads
the GstMixerTrack that has changed, and the new value of the mute
flag.
</p>
<p>
The GstMixerTrack remains valid until the message is freed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A mute-toggled change notification message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>Pointer to hold a GstMixerTrack object, or NULL.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mute</code></em> :</span></p></td>
<td>A pointer to a gboolean variable, or NULL.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.14</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-message-parse-option-changed"></a><h3>gst_mixer_message_parse_option_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_message_parse_option_changed
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> **options</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> **value</code></em>);</pre>
<p>
Extracts the GstMixerOptions and new value from a option-changed bus notification
message.
</p>
<p>
The options and value returned remain valid until the message is freed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A volume-changed change notification message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>options</code></em> :</span></p></td>
<td>Pointer to hold a GstMixerOptions object, or NULL.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>Result location to receive the new options value, or NULL.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.14</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-message-parse-record-toggled"></a><h3>gst_mixer_message_parse_record_toggled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_message_parse_record_toggled
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> **track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *record</code></em>);</pre>
<p>
Extracts the contents of a record-toggled bus message. Reads
the GstMixerTrack that has changed, and the new value of the
recording flag.
</p>
<p>
The GstMixerTrack remains valid until the message is freed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A record-toggled change notification message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>Pointer to hold a GstMixerTrack object, or NULL.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>record</code></em> :</span></p></td>
<td>A pointer to a gboolean variable, or NULL.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.14</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-message-parse-volume-changed"></a><h3>gst_mixer_message_parse_volume_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_message_parse_volume_changed
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> **track</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> **volumes</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *num_channels</code></em>);</pre>
<p>
Parses a volume-changed notification message and extracts the track object
it refers to, as well as an array of volumes and the size of the volumes array.
</p>
<p>
The track object remains valid until the message is freed.
</p>
<p>
The caller must free the array returned in the volumes parameter using g_free
when they are done with it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A volume-changed change notification message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>track</code></em> :</span></p></td>
<td>Pointer to hold a GstMixerTrack object, or NULL.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>volumes</code></em> :</span></p></td>
<td>A pointer to receive an array of gint values, or NULL.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num_channels</code></em> :</span></p></td>
<td>Result location to receive the number of channels, or NULL.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.14</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mixer-message-parse-options-list-changed"></a><h3>gst_mixer_message_parse_options_list_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mixer_message_parse_options_list_changed
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> **options</code></em>);</pre>
<p>
Extracts the GstMixerOptions whose value list has changed from an
options-list-changed bus notification message.
</p>
<p>
The options object returned remains valid until the message is freed. You
do not need to unref it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A volume-changed change notification message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>options</code></em> :</span></p></td>
<td>Pointer to hold a GstMixerOptions object, or NULL.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.18</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstmixer.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstMixer-mute-toggled"></a><h3>The <code class="literal">"mute-toggled"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *gstmixer,
<a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *arg1,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> arg2,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
</div>
<hr>
<div class="refsect2">
<a name="GstMixer-option-changed"></a><h3>The <code class="literal">"option-changed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *gstmixer,
<a class="link" href="gst-plugins-base-libs-gstmixeroptions.html#GstMixerOptions"><span class="type">GstMixerOptions</span></a> *arg1,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *arg2,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
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<hr>
<div class="refsect2">
<a name="GstMixer-record-toggled"></a><h3>The <code class="literal">"record-toggled"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *gstmixer,
<a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *arg1,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> arg2,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
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<hr>
<div class="refsect2">
<a name="GstMixer-volume-changed"></a><h3>The <code class="literal">"volume-changed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="gst-plugins-base-libs-gstmixer.html#GstMixer"><span class="type">GstMixer</span></a> *gstmixer,
<a class="link" href="gst-plugins-base-libs-gstmixertrack.html#GstMixerTrack"><span class="type">GstMixerTrack</span></a> *arg1,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> arg2,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstmixer.see-also"></a><h2>See Also</h2>
alsamixer, oss4mixer, sunaudiomixer
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