docs/libs/html/gst-plugins-base-libs-gststreamvolume.html

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  24 <a href="#gst-plugins-base-libs-gststreamvolume.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gst-plugins-base-libs-gststreamvolume.description" class="shortcut">Description</a>
  27                    |
  28                   <a href="#gst-plugins-base-libs-gststreamvolume.object-hierarchy" class="shortcut">Object Hierarchy</a>
  29                    |
  30                   <a href="#gst-plugins-base-libs-gststreamvolume.prerequisites" class="shortcut">Prerequisites</a>
  31                    |
  32                   <a href="#gst-plugins-base-libs-gststreamvolume.properties" class="shortcut">Properties</a>
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  35 <div class="refentry">
  36 <a name="gst-plugins-base-libs-gststreamvolume"></a><div class="titlepage"></div>
  37 <div class="refnamediv"><table width="100%"><tr>
  38 <td valign="top">
  39 <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gststreamvolume.top_of_page"></a>gststreamvolume</span></h2>
  40 <p>gststreamvolume — Interface for elements that provide a stream volume</p>
  41 </td>
  42 <td valign="top" align="right"></td>
  43 </tr></table></div>
  44 <div class="refsynopsisdiv">
  45 <a name="gst-plugins-base-libs-gststreamvolume.synopsis"></a><h2>Synopsis</h2>
  46 <a name="GstStreamVolume"></a><pre class="synopsis">
  47 #include &lt;gst/interfaces/streamvolume.h&gt;
  48
  49                     <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume-struct" title="GstStreamVolume">GstStreamVolume</a>;
  50 enum                <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat">GstStreamVolumeFormat</a>;
  51 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             <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>        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>,
  52                                                          <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>);
  53 <span class="returnvalue">void</span>                <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>        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>,
  54                                                          <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>,
  55                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> val</code></em>);
  56 <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-gststreamvolume.html#gst-stream-volume-get-mute" title="gst_stream_volume_get_mute ()">gst_stream_volume_get_mute</a>          (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>);
  57 <span class="returnvalue">void</span>                <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>          (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> *volume</code></em>,
  58                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> mute</code></em>);
  59 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             <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>    (<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>,
  60                                                          <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>,
  61                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> val</code></em>);
  62 </pre>
  63 </div>
  64 <div class="refsect1">
  65 <a name="gst-plugins-base-libs-gststreamvolume.object-hierarchy"></a><h2>Object Hierarchy</h2>
  66 <pre class="synopsis">
  67   GInterface
  68    +----GstStreamVolume
  69 </pre>
  70 </div>
  71 <div class="refsect1">
  72 <a name="gst-plugins-base-libs-gststreamvolume.prerequisites"></a><h2>Prerequisites</h2>
  73 <p>
  74 GstStreamVolume requires
  75  <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>.</p>
  76 </div>
  77 <div class="refsect1">
  78 <a name="gst-plugins-base-libs-gststreamvolume.properties"></a><h2>Properties</h2>
  79 <pre class="synopsis">
  80   "<a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume--mute" title='The "mute" property'>mute</a>"                     <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write
  81   "<a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume--volume" title='The "volume" property'>volume</a>"                   <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>               : Read / Write
  82 </pre>
  83 </div>
  84 <div class="refsect1">
  85 <a name="gst-plugins-base-libs-gststreamvolume.description"></a><h2>Description</h2>
  86 <p>
  87 </p>
  88 <div class="refsect2">
  89 <a name="idp15191264"></a><p>
  90 This interface is implemented by elements that provide a stream volume. Examples for
  91 such elements are <span class="type">volume</span> and <span class="type">playbin2</span>.
  92 </p>
  93 <p>
  94 Applications can use this interface to get or set the current stream volume. For this
  95 the "volume" <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><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>
  96 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
  97 1.0 is 100%. For showing the volume in a GUI it might make sense to convert it to
  98 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
  99 use a cubic volume.
 100 </p>
 101 <p>
 102 Separate from the volume the stream can also be muted by the "mute" <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> property or
 103 <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>.
 104 </p>
 105 <p>
 106 Elements that provide some kind of stream volume should implement the "volume" and
 107 "mute" <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> properties and handle setting and getting of them properly.
 108 The volume property is defined to be a linear volume factor.
 109 </p>
 110 </div>
 111 <p>
 112 </p>
 113 </div>
 114 <div class="refsect1">
 115 <a name="gst-plugins-base-libs-gststreamvolume.details"></a><h2>Details</h2>
 116 <div class="refsect2">
 117 <a name="GstStreamVolume-struct"></a><h3>GstStreamVolume</h3>
 118 <pre class="programlisting">typedef struct _GstStreamVolume GstStreamVolume;</pre>
 119 </div>
 120 <hr>
 121 <div class="refsect2">
 122 <a name="GstStreamVolumeFormat"></a><h3>enum GstStreamVolumeFormat</h3>
 123 <pre class="programlisting">typedef enum {
 124   GST_STREAM_VOLUME_FORMAT_LINEAR = 0,
 125   GST_STREAM_VOLUME_FORMAT_CUBIC,
 126   GST_STREAM_VOLUME_FORMAT_DB
 127 } GstStreamVolumeFormat;
 128 </pre>
 129 <p>
 130 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>
 131 allows to convert between the different representations.
 132 </p>
 133 <p>
 134 Formulas to convert from a linear to a cubic or dB volume are
 135 cbrt(val) and 20 * log10 (val).
 136 </p>
 137 <div class="variablelist"><table border="0">
 138 <col align="left" valign="top">
 139 <tbody>
 140 <tr>
 141 <td><p><a name="GST-STREAM-VOLUME-FORMAT-LINEAR:CAPS"></a><span class="term"><code class="literal">GST_STREAM_VOLUME_FORMAT_LINEAR</code></span></p></td>
 142 <td>Linear scale factor, 1.0 = 100%
 143 </td>
 144 </tr>
 145 <tr>
 146 <td><p><a name="GST-STREAM-VOLUME-FORMAT-CUBIC:CAPS"></a><span class="term"><code class="literal">GST_STREAM_VOLUME_FORMAT_CUBIC</code></span></p></td>
 147 <td>Cubic volume scale
 148 </td>
 149 </tr>
 150 <tr>
 151 <td><p><a name="GST-STREAM-VOLUME-FORMAT-DB:CAPS"></a><span class="term"><code class="literal">GST_STREAM_VOLUME_FORMAT_DB</code></span></p></td>
 152 <td>Logarithmic volume scale (dB, amplitude not power)
 153 </td>
 154 </tr>
 155 </tbody>
 156 </table></div>
 157 <p class="since">Since 0.10.25</p>
 158 </div>
 159 <hr>
 160 <div class="refsect2">
 161 <a name="gst-stream-volume-get-volume"></a><h3>gst_stream_volume_get_volume ()</h3>
 162 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-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>,
 163                                                          <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>
 164 <div class="variablelist"><table border="0">
 165 <col align="left" valign="top">
 166 <tbody>
 167 <tr>
 168 <td><p><span class="term"><em class="parameter"><code>volume</code></em> :</span></p></td>
 169 <td>
 170 <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</td>
 171 </tr>
 172 <tr>
 173 <td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
 174 <td>
 175 <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> which should be returned</td>
 176 </tr>
 177 <tr>
 178 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 179 <td>The current stream volume as linear factor</td>
 180 </tr>
 181 </tbody>
 182 </table></div>
 183 <p class="since">Since 0.10.25</p>
 184 </div>
 185 <hr>
 186 <div class="refsect2">
 187 <a name="gst-stream-volume-set-volume"></a><h3>gst_stream_volume_set_volume ()</h3>
 188 <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>,
 189                                                          <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>,
 190                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> val</code></em>);</pre>
 191 <div class="variablelist"><table border="0">
 192 <col align="left" valign="top">
 193 <tbody>
 194 <tr>
 195 <td><p><span class="term"><em class="parameter"><code>volume</code></em> :</span></p></td>
 196 <td>
 197 <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</td>
 198 </tr>
 199 <tr>
 200 <td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
 201 <td>
 202 <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>
 203 </td>
 204 </tr>
 205 <tr>
 206 <td><p><span class="term"><em class="parameter"><code>val</code></em> :</span></p></td>
 207 <td>Linear volume factor that should be set</td>
 208 </tr>
 209 </tbody>
 210 </table></div>
 211 <p class="since">Since 0.10.25</p>
 212 </div>
 213 <hr>
 214 <div class="refsect2">
 215 <a name="gst-stream-volume-get-mute"></a><h3>gst_stream_volume_get_mute ()</h3>
 216 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-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>
 217 <div class="variablelist"><table border="0">
 218 <col align="left" valign="top">
 219 <tbody>
 220 <tr>
 221 <td><p><span class="term"><em class="parameter"><code>volume</code></em> :</span></p></td>
 222 <td>
 223 <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</td>
 224 </tr>
 225 <tr>
 226 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 227 <td>Returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the stream is muted</td>
 228 </tr>
 229 </tbody>
 230 </table></div>
 231 <p class="since">Since 0.10.25</p>
 232 </div>
 233 <hr>
 234 <div class="refsect2">
 235 <a name="gst-stream-volume-set-mute"></a><h3>gst_stream_volume_set_mute ()</h3>
 236 <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>,
 237                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> mute</code></em>);</pre>
 238 <div class="variablelist"><table border="0">
 239 <col align="left" valign="top">
 240 <tbody>
 241 <tr>
 242 <td><p><span class="term"><em class="parameter"><code>volume</code></em> :</span></p></td>
 243 <td>
 244 <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolume"><span class="type">GstStreamVolume</span></a> that should be used</td>
 245 </tr>
 246 <tr>
 247 <td><p><span class="term"><em class="parameter"><code>mute</code></em> :</span></p></td>
 248 <td>Mute state that should be set</td>
 249 </tr>
 250 </tbody>
 251 </table></div>
 252 <p class="since">Since 0.10.25</p>
 253 </div>
 254 <hr>
 255 <div class="refsect2">
 256 <a name="gst-stream-volume-convert-volume"></a><h3>gst_stream_volume_convert_volume ()</h3>
 257 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-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>,
 258                                                          <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>,
 259                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> val</code></em>);</pre>
 260 <div class="variablelist"><table border="0">
 261 <col align="left" valign="top">
 262 <tbody>
 263 <tr>
 264 <td><p><span class="term"><em class="parameter"><code>from</code></em> :</span></p></td>
 265 <td>
 266 <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> to convert from</td>
 267 </tr>
 268 <tr>
 269 <td><p><span class="term"><em class="parameter"><code>to</code></em> :</span></p></td>
 270 <td>
 271 <a class="link" href="gst-plugins-base-libs-gststreamvolume.html#GstStreamVolumeFormat" title="enum GstStreamVolumeFormat"><span class="type">GstStreamVolumeFormat</span></a> to convert to</td>
 272 </tr>
 273 <tr>
 274 <td><p><span class="term"><em class="parameter"><code>val</code></em> :</span></p></td>
 275 <td>Volume in <em class="parameter"><code>from</code></em> format that should be converted</td>
 276 </tr>
 277 <tr>
 278 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 279 <td>the converted volume</td>
 280 </tr>
 281 </tbody>
 282 </table></div>
 283 <p class="since">Since 0.10.25</p>
 284 </div>
 285 </div>
 286 <div class="refsect1">
 287 <a name="gst-plugins-base-libs-gststreamvolume.property-details"></a><h2>Property Details</h2>
 288 <div class="refsect2">
 289 <a name="GstStreamVolume--mute"></a><h3>The <code class="literal">"mute"</code> property</h3>
 290 <pre class="programlisting">  "mute"                     <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
 291 <p>Mute the audio channel without changing the volume.</p>
 292 <p>Default value: FALSE</p>
 293 </div>
 294 <hr>
 295 <div class="refsect2">
 296 <a name="GstStreamVolume--volume"></a><h3>The <code class="literal">"volume"</code> property</h3>
 297 <pre class="programlisting">  "volume"                   <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>               : Read / Write</pre>
 298 <p>Linear volume factor, 1.0=100%.</p>
 299 <p>Allowed values: &gt;= 0</p>
 300 <p>Default value: 1</p>
 301 </div>
 302 </div>
 303 </div>
 304 <div class="footer">
 305 <hr>
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