docs/plugins/html/gst-plugins-good-plugins-dtmfsrc.html - mtk-gst-plugins-good-debian - Git at Google

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 <a name="gst-plugins-good-plugins-dtmfsrc"></a><div class="titlepage"></div>
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 <td valign="top">
 <h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-dtmfsrc.top_of_page"></a>dtmfsrc</span></h2>
 <p>dtmfsrc — Generates DTMF tones</p>
 </td>
 <td class="gallery_image" valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.properties"></a><h2>Properties</h2>
 <div class="informaltable"><table 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="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
 <td class="property_name"><a class="link" href="gst-plugins-good-plugins-dtmfsrc.html#GstDTMFSrc--interval" title="The “interval” property">interval</a></td>
 <td class="property_flags">Read / Write</td>
 </tr></tbody>
 </table></div>
 </div>
 <a name="GstDTMFSrc"></a><div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.other"></a><h2>Types and Values</h2>
 <div class="informaltable"><table 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-good-plugins-dtmfsrc.html#GstDTMFSrc-struct" title="struct GstDTMFSrc">GstDTMFSrc</a></td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
 <pre class="screen">    <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
     <span class="lineart">╰──</span> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
         <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
             <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
                 <span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html">GstBaseSrc</a>
                     <span class="lineart">╰──</span> GstDTMFSrc
 </pre>
 </div>
 <div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.description"></a><h2>Description</h2>
 <p>The DTMFSrc element generates DTMF (ITU-T Q.23 Specification) tone packets on request
 from application. The application communicates the beginning and end of a
 DTMF event using custom upstream gstreamer events. To report a DTMF event, an
 application must send an event of type GST_EVENT_CUSTOM_UPSTREAM, having a
 structure of name "dtmf-event" with fields set according to the following
 table:</p>
 <div class="informaltable"><table border="1">
 <colgroup>
 <col class="Name">
 <col class="Type">
 <col class="Possible values">
 <col class="Purpose">
 </colgroup>
 <thead><tr>
 <th>Name</th>
 <th>GType</th>
 <th>Possible values</th>
 <th>Purpose</th>
 </tr></thead>
 <tbody>
 <tr>
 <td>type</td>
 <td>G_TYPE_INT</td>
 <td>0-1</td>
 <td>The application uses this field to specify which of the two methods
 specified in RFC 2833 to use. The value should be 0 for tones and 1 for
 named events. Tones are specified by their frequencies and events are specied
 by their number. This element can only take events as input. Do not confuse
 with "method" which specified the output.
 </td>
 </tr>
 <tr>
 <td>number</td>
 <td>G_TYPE_INT</td>
 <td>0-15</td>
 <td>The event number.</td>
 </tr>
 <tr>
 <td>volume</td>
 <td>G_TYPE_INT</td>
 <td>0-36</td>
 <td>This field describes the power level of the tone, expressed in dBm0
 after dropping the sign. Power levels range from 0 to -63 dBm0. The range of
 valid DTMF is from 0 to -36 dBm0. Can be omitted if start is set to FALSE.
 </td>
 </tr>
 <tr>
 <td>start</td>
 <td>G_TYPE_BOOLEAN</td>
 <td>True or False</td>
 <td>Whether the event is starting or ending.</td>
 </tr>
 <tr>
 <td>method</td>
 <td>G_TYPE_INT</td>
 <td>2</td>
 <td>The method used for sending event, this element will react if this
 field is absent or 2.
 </td>
 </tr>
 </tbody>
 </table></div>
 <p>For example, the following code informs the pipeline (and in turn, the
 DTMFSrc element inside the pipeline) about the start of a DTMF named
 event '1' of volume -25 dBm0:</p>
 <pre class="programlisting">
 structure = gst_structure_new ("dtmf-event",
                    "type", G_TYPE_INT, 1,
                    "number", G_TYPE_INT, 1,
                    "volume", G_TYPE_INT, 25,
                    "start", G_TYPE_BOOLEAN, TRUE, NULL);

 event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, structure);
 gst_element_send_event (pipeline, event);
 </pre>
 <p>When a DTMF tone actually starts or stop, a "dtmf-event-processed"
 element <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstMessage.html"><span class="type">GstMessage</span></a> with the same fields as the "dtmf-event"
 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstEvent.html"><span class="type">GstEvent</span></a> that was used to request the event. Also, if any event
 has not been processed when the element goes from the PAUSED to the
 READY state, then a "dtmf-event-dropped" message is posted on the
 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html"><span class="type">GstBus</span></a> in the order that they were received.</p>
 <div class="refsynopsisdiv">
 <h2>Synopsis</h2>
 <div class="refsect2">
 <a name="id-1.2.44.7.6.4.1"></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-good-plugins-plugin-dtmf.html#plugin-dtmf">dtmf</a>
           </td>
 </tr>
 <tr>
 <td><p><span class="term">author</span></p></td>
 <td>Youness Alaoui &lt;youness.alaoui@collabora.co.uk&gt;</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-1.2.44.7.6.4.2"></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, rate=(int)[ 1, 2147483647 ], channels=(int)1</td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <p>
 </p>
 </div>
 <div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.functions_details"></a><h2>Functions</h2>
 <p></p>
 </div>
 <div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.other_details"></a><h2>Types and Values</h2>
 <div class="refsect2">
 <a name="GstDTMFSrc-struct"></a><h3>struct GstDTMFSrc</h3>
 <pre class="programlisting">struct GstDTMFSrc;</pre>
 <p>The opaque <a class="link" href="gst-plugins-good-plugins-dtmfsrc.html#GstDTMFSrc"><span class="type">GstDTMFSrc</span></a> data structure.</p>
 <div class="refsect3">
 <a name="id-1.2.44.9.2.5"></a><h4>Members</h4>
 <div class="informaltable"><table width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody></tbody>
 </table></div>
 </div>
 </div>
 </div>
 <div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.property-details"></a><h2>Property Details</h2>
 <div class="refsect2">
 <a name="GstDTMFSrc--interval"></a><h3>The <code class="literal">“interval”</code> property</h3>
 <pre class="programlisting">  “interval”                 <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
 <p>Interval in ms between two tone packets.</p>
 <p>Flags: Read / Write</p>
 <p>Allowed values: [10,50]</p>
 <p>Default value: 50</p>
 </div>
 </div>
 <div class="refsect1">
 <a name="gst-plugins-good-plugins-dtmfsrc.see-also"></a><h2>See Also</h2>
 <p>rtpdtmsrc, rtpdtmfmuxx</p>
 </div>
 </div>
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	<a name="gst-plugins-good-plugins-dtmfsrc"></a><div class="titlepage"></div>
	<div class="refnamediv"><table width="100%"><tr>
	<td valign="top">
	<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-dtmfsrc.top_of_page"></a>dtmfsrc</span></h2>
	<p>dtmfsrc — Generates DTMF tones</p>
	</td>
	<td class="gallery_image" valign="top" align="right"></td>
	</tr></table></div>
	<div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.properties"></a><h2>Properties</h2>
	<div class="informaltable"><table 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="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
	<td class="property_name"><a class="link" href="gst-plugins-good-plugins-dtmfsrc.html#GstDTMFSrc--interval" title="The “interval” property">interval</a></td>
	<td class="property_flags">Read / Write</td>
	</tr></tbody>
	</table></div>
	</div>
	<a name="GstDTMFSrc"></a><div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.other"></a><h2>Types and Values</h2>
	<div class="informaltable"><table 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-good-plugins-dtmfsrc.html#GstDTMFSrc-struct" title="struct GstDTMFSrc">GstDTMFSrc</a></td>
	</tr></tbody>
	</table></div>
	</div>
	<div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
	<pre class="screen"> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
	<span class="lineart">╰──</span> <a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
	<span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
	<span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
	<span class="lineart">╰──</span> <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html">GstBaseSrc</a>
	<span class="lineart">╰──</span> GstDTMFSrc
	</pre>
	</div>
	<div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.description"></a><h2>Description</h2>
	<p>The DTMFSrc element generates DTMF (ITU-T Q.23 Specification) tone packets on request
	from application. The application communicates the beginning and end of a
	DTMF event using custom upstream gstreamer events. To report a DTMF event, an
	application must send an event of type GST_EVENT_CUSTOM_UPSTREAM, having a
	structure of name "dtmf-event" with fields set according to the following
	table:</p>
	<div class="informaltable"><table border="1">
	<colgroup>
	<col class="Name">
	<col class="Type">
	<col class="Possible values">
	<col class="Purpose">
	</colgroup>
	<thead><tr>
	<th>Name</th>
	<th>GType</th>
	<th>Possible values</th>
	<th>Purpose</th>
	</tr></thead>
	<tbody>
	<tr>
	<td>type</td>
	<td>G_TYPE_INT</td>
	<td>0-1</td>
	<td>The application uses this field to specify which of the two methods
	specified in RFC 2833 to use. The value should be 0 for tones and 1 for
	named events. Tones are specified by their frequencies and events are specied
	by their number. This element can only take events as input. Do not confuse
	with "method" which specified the output.
	</td>
	</tr>
	<tr>
	<td>number</td>
	<td>G_TYPE_INT</td>
	<td>0-15</td>
	<td>The event number.</td>
	</tr>
	<tr>
	<td>volume</td>
	<td>G_TYPE_INT</td>
	<td>0-36</td>
	<td>This field describes the power level of the tone, expressed in dBm0
	after dropping the sign. Power levels range from 0 to -63 dBm0. The range of
	valid DTMF is from 0 to -36 dBm0. Can be omitted if start is set to FALSE.
	</td>
	</tr>
	<tr>
	<td>start</td>
	<td>G_TYPE_BOOLEAN</td>
	<td>True or False</td>
	<td>Whether the event is starting or ending.</td>
	</tr>
	<tr>
	<td>method</td>
	<td>G_TYPE_INT</td>
	<td>2</td>
	<td>The method used for sending event, this element will react if this
	field is absent or 2.
	</td>
	</tr>
	</tbody>
	</table></div>
	<p>For example, the following code informs the pipeline (and in turn, the
	DTMFSrc element inside the pipeline) about the start of a DTMF named
	event '1' of volume -25 dBm0:</p>
	<pre class="programlisting">
	structure = gst_structure_new ("dtmf-event",
	"type", G_TYPE_INT, 1,
	"number", G_TYPE_INT, 1,
	"volume", G_TYPE_INT, 25,
	"start", G_TYPE_BOOLEAN, TRUE, NULL);

	event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, structure);
	gst_element_send_event (pipeline, event);
	</pre>
	<p>When a DTMF tone actually starts or stop, a "dtmf-event-processed"
	element <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstMessage.html"><span class="type">GstMessage</span></a> with the same fields as the "dtmf-event"
	<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstEvent.html"><span class="type">GstEvent</span></a> that was used to request the event. Also, if any event
	has not been processed when the element goes from the PAUSED to the
	READY state, then a "dtmf-event-dropped" message is posted on the
	<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html"><span class="type">GstBus</span></a> in the order that they were received.</p>
	<div class="refsynopsisdiv">
	<h2>Synopsis</h2>
	<div class="refsect2">
	<a name="id-1.2.44.7.6.4.1"></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-good-plugins-plugin-dtmf.html#plugin-dtmf">dtmf</a>
	</td>
	</tr>
	<tr>
	<td><p><span class="term">author</span></p></td>
	<td>Youness Alaoui <youness.alaoui@collabora.co.uk></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-1.2.44.7.6.4.2"></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, rate=(int)[ 1, 2147483647 ], channels=(int)1</td>
	</tr>
	</tbody>
	</table></div>
	</div>
	</div>
	<p>
	</p>
	</div>
	<div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.functions_details"></a><h2>Functions</h2>
	<p></p>
	</div>
	<div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.other_details"></a><h2>Types and Values</h2>
	<div class="refsect2">
	<a name="GstDTMFSrc-struct"></a><h3>struct GstDTMFSrc</h3>
	<pre class="programlisting">struct GstDTMFSrc;</pre>
	<p>The opaque <a class="link" href="gst-plugins-good-plugins-dtmfsrc.html#GstDTMFSrc"><span class="type">GstDTMFSrc</span></a> data structure.</p>
	<div class="refsect3">
	<a name="id-1.2.44.9.2.5"></a><h4>Members</h4>
	<div class="informaltable"><table width="100%" border="0">
	<colgroup>
	<col width="300px" class="struct_members_name">
	<col class="struct_members_description">
	<col width="200px" class="struct_members_annotations">
	</colgroup>
	<tbody></tbody>
	</table></div>
	</div>
	</div>
	</div>
	<div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.property-details"></a><h2>Property Details</h2>
	<div class="refsect2">
	<a name="GstDTMFSrc--interval"></a><h3>The <code class="literal">“interval”</code> property</h3>
	<pre class="programlisting"> “interval” <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
	<p>Interval in ms between two tone packets.</p>
	<p>Flags: Read / Write</p>
	<p>Allowed values: [10,50]</p>
	<p>Default value: 50</p>
	</div>
	</div>
	<div class="refsect1">
	<a name="gst-plugins-good-plugins-dtmfsrc.see-also"></a><h2>See Also</h2>
	<p>rtpdtmsrc, rtpdtmfmuxx</p>
	</div>
	</div>
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