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| <a name="gst-plugins-base-libs-gststreamvolume"></a><div class="titlepage"></div> |
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| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gststreamvolume.top_of_page"></a>gststreamvolume</span></h2> |
| <p>gststreamvolume — Interface for elements that provide a stream volume</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.functions"></a><h2>Functions</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="functions_return"> |
| <col class="functions_name"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="function_type"> |
| <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-get-volume" title="gst_stream_volume_get_volume ()">gst_stream_volume_get_volume</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-set-volume" title="gst_stream_volume_set_volume ()">gst_stream_volume_set_volume</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-get-mute" title="gst_stream_volume_get_mute ()">gst_stream_volume_get_mute</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-set-mute" title="gst_stream_volume_set_mute ()">gst_stream_volume_set_mute</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-convert-volume" title="gst_stream_volume_convert_volume ()">gst_stream_volume_convert_volume</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.properties"></a><h2>Properties</h2> |
| <div class="informaltable"><table class="informaltable" border="0"> |
| <colgroup> |
| <col width="150px" class="properties_type"> |
| <col width="300px" class="properties_name"> |
| <col width="200px" class="properties_flags"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td> |
| <td class="property_name"><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume--mute" title="The “mute” property">mute</a></td> |
| <td class="property_flags">Read / Write</td> |
| </tr> |
| <tr> |
| <td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></td> |
| <td class="property_name"><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume--volume" title="The “volume” property">volume</a></td> |
| <td class="property_flags">Read / Write</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <a name="GstStreamVolume"></a><div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.other"></a><h2>Types and Values</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="name"> |
| <col class="description"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="datatype_keyword"> </td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume-struct" title="GstStreamVolume">GstStreamVolume</a></td> |
| </tr> |
| <tr> |
| <td class="datatype_keyword">enum</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat">GstStreamVolumeFormat</a></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="screen"> <a href="https://developer.gnome.org/gobject/unstable/GTypeModule.html">GInterface</a> |
| <span class="lineart">╰──</span> GstStreamVolume |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.prerequisites"></a><h2>Prerequisites</h2> |
| <p> |
| GstStreamVolume requires |
| <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct">GObject</a>.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gst/audio/streamvolume.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.description"></a><h2>Description</h2> |
| <div class="refsect2"> |
| <a name="id-1.2.6.19.10.2"></a><p> |
| This interface is implemented by elements that provide a stream volume. Examples for |
| such elements are <span class="type">volume</span> and <span class="type">playbin</span>. |
| </p> |
| <p> |
| Applications can use this interface to get or set the current stream volume. For this |
| the "volume" <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct"><span class="type">GObject</span></a> property can be used or the helper functions <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-set-volume" title="gst_stream_volume_set_volume ()"><code class="function">gst_stream_volume_set_volume()</code></a> |
| and <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-get-volume" title="gst_stream_volume_get_volume ()"><code class="function">gst_stream_volume_get_volume()</code></a>. This volume is always a linear factor, i.e. 0.0 is muted |
| 1.0 is 100%. For showing the volume in a GUI it might make sense to convert it to |
| a different format by using <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-convert-volume" title="gst_stream_volume_convert_volume ()"><code class="function">gst_stream_volume_convert_volume()</code></a>. Volume sliders should usually |
| use a cubic volume. |
| |
| Separate from the volume the stream can also be muted by the "mute" <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct"><span class="type">GObject</span></a> property or |
| <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-set-mute" title="gst_stream_volume_set_mute ()"><code class="function">gst_stream_volume_set_mute()</code></a> and <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-get-mute" title="gst_stream_volume_get_mute ()"><code class="function">gst_stream_volume_get_mute()</code></a>. |
| </p> |
| <p> |
| Elements that provide some kind of stream volume should implement the "volume" and |
| "mute" <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct"><span class="type">GObject</span></a> properties and handle setting and getting of them properly. |
| The volume property is defined to be a linear volume factor. |
| </p> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="gst-stream-volume-get-volume"></a><h3>gst_stream_volume_get_volume ()</h3> |
| <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> |
| gst_stream_volume_get_volume (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> format</code></em>);</pre> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-get-volume.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>volume</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>format</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> which should be returned</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-get-volume.returns"></a><h4>Returns</h4> |
| <p> The current stream volume as linear factor</p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-stream-volume-set-volume"></a><h3>gst_stream_volume_set_volume ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_stream_volume_set_volume (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> format</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> val</code></em>);</pre> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-set-volume.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>volume</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>format</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> of <em class="parameter"><code>val</code></em> |
| </p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>val</p></td> |
| <td class="parameter_description"><p>Linear volume factor that should be set</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-stream-volume-get-mute"></a><h3>gst_stream_volume_get_mute ()</h3> |
| <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> |
| gst_stream_volume_get_mute (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>);</pre> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-get-mute.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody><tr> |
| <td class="parameter_name"><p>volume</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-get-mute.returns"></a><h4>Returns</h4> |
| <p> Returns <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the stream is muted</p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-stream-volume-set-mute"></a><h3>gst_stream_volume_set_mute ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_stream_volume_set_mute (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> mute</code></em>);</pre> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-set-mute.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>volume</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>mute</p></td> |
| <td class="parameter_description"><p>Mute state that should be set</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-stream-volume-convert-volume"></a><h3>gst_stream_volume_convert_volume ()</h3> |
| <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> |
| gst_stream_volume_convert_volume (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> from</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> to</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> val</code></em>);</pre> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-convert-volume.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>from</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> to convert from</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>to</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> to convert to</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>val</p></td> |
| <td class="parameter_description"><p>Volume in <em class="parameter"><code>from</code></em> |
| format that should be converted</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-stream-volume-convert-volume.returns"></a><h4>Returns</h4> |
| <p> the converted volume</p> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstStreamVolume-struct"></a><h3>GstStreamVolume</h3> |
| <pre class="programlisting">typedef struct _GstStreamVolume GstStreamVolume;</pre> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstStreamVolumeFormat"></a><h3>enum GstStreamVolumeFormat</h3> |
| <p>Different representations of a stream volume. <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#gst-stream-volume-convert-volume" title="gst_stream_volume_convert_volume ()"><code class="function">gst_stream_volume_convert_volume()</code></a> |
| allows to convert between the different representations.</p> |
| <p>Formulas to convert from a linear to a cubic or dB volume are |
| cbrt(val) and 20 * log10 (val).</p> |
| <div class="refsect3"> |
| <a name="GstStreamVolumeFormat.members"></a><h4>Members</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="300px" class="enum_members_name"> |
| <col class="enum_members_description"> |
| <col width="200px" class="enum_members_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-STREAM-VOLUME-FORMAT-LINEAR:CAPS"></a>GST_STREAM_VOLUME_FORMAT_LINEAR</p></td> |
| <td class="enum_member_description"> |
| <p>Linear scale factor, 1.0 = 100%</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-STREAM-VOLUME-FORMAT-CUBIC:CAPS"></a>GST_STREAM_VOLUME_FORMAT_CUBIC</p></td> |
| <td class="enum_member_description"> |
| <p>Cubic volume scale</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-STREAM-VOLUME-FORMAT-DB:CAPS"></a>GST_STREAM_VOLUME_FORMAT_DB</p></td> |
| <td class="enum_member_description"> |
| <p>Logarithmic volume scale (dB, amplitude not power)</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gststreamvolume.property-details"></a><h2>Property Details</h2> |
| <div class="refsect2"> |
| <a name="GstStreamVolume--mute"></a><h3>The <code class="literal">“mute”</code> property</h3> |
| <pre class="programlisting"> “mute” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> |
| <p>Mute the audio channel without changing the volume.</p> |
| <p>Flags: Read / Write</p> |
| <p>Default value: FALSE</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstStreamVolume--volume"></a><h3>The <code class="literal">“volume”</code> property</h3> |
| <pre class="programlisting"> “volume” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></pre> |
| <p>Linear volume factor, 1.0=100%.</p> |
| <p>Flags: Read / Write</p> |
| <p>Allowed values: >= 0</p> |
| <p>Default value: 1</p> |
| </div> |
| </div> |
| </div> |
| <div class="footer"> |
| <hr>Generated by GTK-Doc V1.25</div> |
| </body> |
| </html> |
