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| <div class="refentry"> |
| <a name="gst-plugins-base-plugins-audiotestsrc"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-audiotestsrc.top_of_page"></a>audiotestsrc</span></h2> |
| <p>audiotestsrc</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-audiotestsrc.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-plugins-audiotestsrc.html#GstAudioTestSrc--can-activate-pull" title="The “can-activate-pull” property">can-activate-pull</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#gboolean"><span class="type">gboolean</span></a></td> |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--can-activate-push" title="The “can-activate-push” property">can-activate-push</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-plugins-audiotestsrc.html#GstAudioTestSrc--freq" title="The “freq” property">freq</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#gboolean"><span class="type">gboolean</span></a></td> |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--is-live" title="The “is-live” property">is-live</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#gint"><span class="type">gint</span></a></td> |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--samplesperbuffer" title="The “samplesperbuffer” property">samplesperbuffer</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#gint64"><span class="type">gint64</span></a></td> |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--timestamp-offset" title="The “timestamp-offset” property">timestamp-offset</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-plugins-audiotestsrc.html#GstAudioTestSrc--volume" title="The “volume” property">volume</a></td> |
| <td class="property_flags">Read / Write</td> |
| </tr> |
| <tr> |
| <td class="property_type"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave"><span class="type">GstAudioTestSrcWave</span></a></td> |
| <td class="property_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc--wave" title="The “wave” property">wave</a></td> |
| <td class="property_flags">Read / Write</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <a name="GstAudioTestSrc"></a><div class="refsect1"> |
| <a name="gst-plugins-base-plugins-audiotestsrc.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">struct</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrc-struct" title="struct GstAudioTestSrc">GstAudioTestSrc</a></td> |
| </tr> |
| <tr> |
| <td class="datatype_keyword">enum</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave">GstAudioTestSrcWave</a></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-audiotestsrc.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="screen"> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct">GObject</a> |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstObject.html#GstObject-struct">GstObject</a> |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstElement.html#GstElement-struct">GstElement</a> |
| <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0GstBaseSrc.html#GstBaseSrc-struct">GstBaseSrc</a> |
| <span class="lineart">╰──</span> GstAudioTestSrc |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-audiotestsrc.description"></a><h2>Description</h2> |
| <p>AudioTestSrc can be used to generate basic audio signals. It support several |
| different waveforms and allows to set the base frequency and volume.</p> |
| <div class="refsect2"> |
| <a name="id-1.2.11.7.3"></a><h3>Example launch line</h3> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1</pre></td> |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> audiotestsrc <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> autoaudiosink</pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| This pipeline produces a sine with default frequency, 440 Hz, and the |
| default volume, 0.8 (relative to a maximum 1.0). |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1</pre></td> |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> audiotestsrc wave<span class="gtkdoc opt">=</span><span class="number">2</span> freq<span class="gtkdoc opt">=</span><span class="number">200</span> <span class="gtkdoc opt">!</span> tee name<span class="gtkdoc opt">=</span>t <span class="gtkdoc opt">!</span> queue <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> autoaudiosink t<span class="gtkdoc opt">. !</span> queue <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> libvisual_lv_scope <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> autovideosink</pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| In this example a saw wave is generated. The wave is shown using a |
| scope visualizer from libvisual, allowing you to visually verify that |
| the saw wave is correct. |
| </div> |
| <div class="refsynopsisdiv"> |
| <h2>Synopsis</h2> |
| <div class="refsect2"> |
| <a name="id-1.2.11.7.4.1"></a><h3>Element Information</h3> |
| <div class="variablelist"><table border="0" class="variablelist"> |
| <colgroup> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td><p><span class="term">plugin</span></p></td> |
| <td> |
| <a class="link" href="gst-plugins-base-plugins-plugin-audiotestsrc.html#plugin-audiotestsrc">audiotestsrc</a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term">author</span></p></td> |
| <td>Stefan Kost <ensonic@users.sf.net></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">class</span></p></td> |
| <td>Source/Audio</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="id-1.2.11.7.4.2"></a><h3>Element Pads</h3> |
| <div class="variablelist"><table border="0" class="variablelist"> |
| <colgroup> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td><p><span class="term">name</span></p></td> |
| <td>src</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">direction</span></p></td> |
| <td>source</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">presence</span></p></td> |
| <td>always</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">details</span></p></td> |
| <td>audio/x-raw, format=(string){ S16LE, S16BE, U16LE, U16BE, S24_32LE, S24_32BE, U24_32LE, U24_32BE, S32LE, S32BE, U32LE, U32BE, S24LE, S24BE, U24LE, U24BE, S20LE, S20BE, U20LE, U20BE, S18LE, S18BE, U18LE, U18BE, F32LE, F32BE, F64LE, F64BE, S8, U8 }, layout=(string)interleaved, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ]</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-audiotestsrc.functions_details"></a><h2>Functions</h2> |
| <p></p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-audiotestsrc.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc-struct"></a><h3>struct GstAudioTestSrc</h3> |
| <pre class="programlisting">struct GstAudioTestSrc;</pre> |
| <p>audiotestsrc object structure.</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrcWave"></a><h3>enum GstAudioTestSrcWave</h3> |
| <p>Different types of supported sound waves.</p> |
| <div class="refsect3"> |
| <a name="GstAudioTestSrcWave.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-AUDIO-TEST-SRC-WAVE-SINE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SINE</p></td> |
| <td class="enum_member_description"> |
| <p>a sine wave</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SQUARE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SQUARE</p></td> |
| <td class="enum_member_description"> |
| <p>a square wave</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SAW:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SAW</p></td> |
| <td class="enum_member_description"> |
| <p>a saw wave</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-TRIANGLE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_TRIANGLE</p></td> |
| <td class="enum_member_description"> |
| <p>a tringle wave</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SILENCE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SILENCE</p></td> |
| <td class="enum_member_description"> |
| <p>silence</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-WHITE-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_WHITE_NOISE</p></td> |
| <td class="enum_member_description"> |
| <p>white uniform noise</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-PINK-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_PINK_NOISE</p></td> |
| <td class="enum_member_description"> |
| <p>pink noise</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-SINE-TAB:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_SINE_TAB</p></td> |
| <td class="enum_member_description"> |
| <p>sine wave using a table</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-TICKS:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_TICKS</p></td> |
| <td class="enum_member_description"> |
| <p>periodic ticks</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-GAUSSIAN-WHITE-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_GAUSSIAN_WHITE_NOISE</p></td> |
| <td class="enum_member_description"> |
| <p>white (zero mean) Gaussian noise; volume sets the standard deviation of the noise in units of the range of values of the sample type, e.g. volume=0.1 produces noise with a standard deviation of 0.1*32767=3277 with 16-bit integer samples, or 0.1*1.0=0.1 with floating-point samples.</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-RED-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_RED_NOISE</p></td> |
| <td class="enum_member_description"> |
| <p>red (brownian) noise</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-BLUE-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_BLUE_NOISE</p></td> |
| <td class="enum_member_description"> |
| <p>spectraly inverted pink noise</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-AUDIO-TEST-SRC-WAVE-VIOLET-NOISE:CAPS"></a>GST_AUDIO_TEST_SRC_WAVE_VIOLET_NOISE</p></td> |
| <td class="enum_member_description"> |
| <p>spectraly inverted red (brownian) noise</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-audiotestsrc.property-details"></a><h2>Property Details</h2> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--can-activate-pull"></a><h3>The <code class="literal">“can-activate-pull”</code> property</h3> |
| <pre class="programlisting"> “can-activate-pull” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> |
| <p>Can activate in pull mode.</p> |
| <p>Flags: Read / Write</p> |
| <p>Default value: FALSE</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--can-activate-push"></a><h3>The <code class="literal">“can-activate-push”</code> property</h3> |
| <pre class="programlisting"> “can-activate-push” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> |
| <p>Can activate in push mode.</p> |
| <p>Flags: Read / Write</p> |
| <p>Default value: TRUE</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--freq"></a><h3>The <code class="literal">“freq”</code> property</h3> |
| <pre class="programlisting"> “freq” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a></pre> |
| <p>Frequency of test signal. The sample rate needs to be at least 4 times higher.</p> |
| <p>Flags: Read / Write</p> |
| <p>Allowed values: [0,5.36871e+08]</p> |
| <p>Default value: 440</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--is-live"></a><h3>The <code class="literal">“is-live”</code> property</h3> |
| <pre class="programlisting"> “is-live” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> |
| <p>Whether to act as a live source.</p> |
| <p>Flags: Read / Write</p> |
| <p>Default value: FALSE</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--samplesperbuffer"></a><h3>The <code class="literal">“samplesperbuffer”</code> property</h3> |
| <pre class="programlisting"> “samplesperbuffer” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a></pre> |
| <p>Number of samples in each outgoing buffer.</p> |
| <p>Flags: Read / Write</p> |
| <p>Allowed values: >= 1</p> |
| <p>Default value: 1024</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--timestamp-offset"></a><h3>The <code class="literal">“timestamp-offset”</code> property</h3> |
| <pre class="programlisting"> “timestamp-offset” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre> |
| <p>An offset added to timestamps set on buffers (in ns).</p> |
| <p>Flags: Read / Write</p> |
| <p>Default value: 0</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--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>Volume of test signal.</p> |
| <p>Flags: Read / Write</p> |
| <p>Allowed values: [0,1]</p> |
| <p>Default value: 0.8</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstAudioTestSrc--wave"></a><h3>The <code class="literal">“wave”</code> property</h3> |
| <pre class="programlisting"> “wave” <a class="link" href="gst-plugins-base-plugins-audiotestsrc.html#GstAudioTestSrcWave" title="enum GstAudioTestSrcWave"><span class="type">GstAudioTestSrcWave</span></a></pre> |
| <p>Oscillator waveform.</p> |
| <p>Flags: Read / Write</p> |
| <p>Default value: Sine</p> |
| </div> |
| </div> |
| </div> |
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