docs/plugins/html/gst-plugins-good-plugins-udpsrc.html

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  20 <th width="100%" align="center">GStreamer Good Plugins 0.10 Plugins Reference Manual</th>
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  23 <tr><td colspan="5" class="shortcuts">
  24 <a href="#gst-plugins-good-plugins-udpsrc.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gst-plugins-good-plugins-udpsrc.description" class="shortcut">Description</a>
  27                    |
  28                   <a href="#gst-plugins-good-plugins-udpsrc.object-hierarchy" class="shortcut">Object Hierarchy</a>
  29                    |
  30                   <a href="#gst-plugins-good-plugins-udpsrc.implemented-interfaces" class="shortcut">Implemented Interfaces</a>
  31                    |
  32                   <a href="#gst-plugins-good-plugins-udpsrc.properties" class="shortcut">Properties</a>
  33 </td></tr>
  34 </table>
  35 <div class="refentry">
  36 <a name="gst-plugins-good-plugins-udpsrc"></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-good-plugins-udpsrc.top_of_page"></a>udpsrc</span></h2>
  40 <p>udpsrc — Receive data over the network via UDP</p>
  41 </td>
  42 <td valign="top" align="right"></td>
  43 </tr></table></div>
  44 <div class="refsynopsisdiv">
  45 <a name="gst-plugins-good-plugins-udpsrc.synopsis"></a><h2>Synopsis</h2>
  46 <a name="GstUDPSrc"></a><pre class="synopsis">struct              <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc-struct" title="struct GstUDPSrc">GstUDPSrc</a>;
  47 </pre>
  48 </div>
  49 <div class="refsect1">
  50 <a name="gst-plugins-good-plugins-udpsrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
  51 <pre class="synopsis">
  52   <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
  53    +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
  54          +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
  55                +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html">GstBaseSrc</a>
  56                      +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstPushSrc.html">GstPushSrc</a>
  57                            +----GstUDPSrc
  58 </pre>
  59 </div>
  60 <div class="refsect1">
  61 <a name="gst-plugins-good-plugins-udpsrc.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
  62 <p>
  63 GstUDPSrc implements
  64  <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstUriHandler.html#GstURIHandler">GstURIHandler</a>.</p>
  65 </div>
  66 <div class="refsect1">
  67 <a name="gst-plugins-good-plugins-udpsrc.properties"></a><h2>Properties</h2>
  68 <pre class="synopsis">
  69   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--caps" title='The "caps" property'>caps</a>"                     <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a>*              : Read / Write
  70   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--multicast-group" title='The "multicast-group" property'>multicast-group</a>"          <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>*                : Read / Write
  71   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--port" title='The "port" property'>port</a>"                     <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write
  72   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--uri" title='The "uri" property'>uri</a>"                      <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>*                : Read / Write
  73   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--sockfd" title='The "sockfd" property'>sockfd</a>"                   <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write
  74   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--buffer-size" title='The "buffer-size" property'>buffer-size</a>"              <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write
  75   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--timeout" title='The "timeout" property'>timeout</a>"                  <span class="type">guint64</span>               : Read / Write
  76   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--closefd" title='The "closefd" property'>closefd</a>"                  <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write
  77   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--skip-first-bytes" title='The "skip-first-bytes" property'>skip-first-bytes</a>"         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write
  78   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--sock" title='The "sock" property'>sock</a>"                     <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read
  79   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--auto-multicast" title='The "auto-multicast" property'>auto-multicast</a>"           <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write
  80   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--multicast-iface" title='The "multicast-iface" property'>multicast-iface</a>"          <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>*                : Read / Write
  81   "<a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--reuse" title='The "reuse" property'>reuse</a>"                    <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write
  82 </pre>
  83 </div>
  84 <div class="refsect1">
  85 <a name="gst-plugins-good-plugins-udpsrc.description"></a><h2>Description</h2>
  86 <p>
  87 udpsrc is a network source that reads UDP packets from the network.
  88 It can be combined with RTP depayloaders to implement RTP streaming.
  89 </p>
  90 <p>
  91 The udpsrc element supports automatic port allocation by setting the
  92 <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--port" title='The "port" property'><span class="type">"port"</span></a> property to 0. After setting the udpsrc to PAUSED, the
  93 allocated port can be obtained by reading the port property.
  94 </p>
  95 <p>
  96 udpsrc can read from multicast groups by setting the <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--multicast-group" title='The "multicast-group" property'><span class="type">"multicast-group"</span></a>
  97 property to the IP address of the multicast group.
  98 </p>
  99 <p>
 100 Alternatively one can provide a custom socket to udpsrc with the <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--sockfd" title='The "sockfd" property'><span class="type">"sockfd"</span></a>
 101 property, udpsrc will then not allocate a socket itself but use the provided
 102 one.
 103 </p>
 104 <p>
 105 The <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--caps" title='The "caps" property'><span class="type">"caps"</span></a> property is mainly used to give a type to the UDP packet
 106 so that they can be autoplugged in GStreamer pipelines. This is very usefull
 107 for RTP implementations where the contents of the UDP packets is transfered
 108 out-of-bounds using SDP or other means.
 109 </p>
 110 <p>
 111 The <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--buffer-size" title='The "buffer-size" property'><span class="type">"buffer-size"</span></a> property is used to change the default kernel
 112 buffersizes used for receiving packets. The buffer size may be increased for
 113 high-volume connections, or may be decreased to limit the possible backlog of
 114 incoming data. The system places an absolute limit on these values, on Linux,
 115 for example, the default buffer size is typically 50K and can be increased to
 116 maximally 100K.
 117 </p>
 118 <p>
 119 The <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--skip-first-bytes" title='The "skip-first-bytes" property'><span class="type">"skip-first-bytes"</span></a> property is used to strip off an arbitrary
 120 number of bytes from the start of the raw udp packet and can be used to strip
 121 off proprietary header, for example.
 122 </p>
 123 <p>
 124 The udpsrc is always a live source. It does however not provide a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html"><span class="type">GstClock</span></a>,
 125 this is left for upstream elements such as an RTP session manager or demuxer
 126 (such as an MPEG demuxer). As with all live sources, the captured buffers
 127 will have their timestamp set to the current running time of the pipeline.
 128 </p>
 129 <p>
 130 udpsrc implements a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstUriHandler.html#GstURIHandler"><span class="type">GstURIHandler</span></a> interface that handles udp://host:port
 131 type URIs.
 132 </p>
 133 <p>
 134 If the <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--timeout" title='The "timeout" property'><span class="type">"timeout"</span></a> property is set to a value bigger than 0, udpsrc
 135 will generate an element message named
 136 <code class="classname">"GstUDPSrcTimeout"</code>
 137 if no data was recieved in the given timeout.
 138 The message's structure contains one field:
 139 </p>
 140 <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>
 141   <span class="type">guint64</span>
 142   <code class="classname">"timeout"</code>: the timeout in microseconds that
 143   expired when waiting for data.
 144   </p></li></ul></div>
 145 <p>
 146 The message is typically used to detect that no UDP arrives in the receiver
 147 because it is blocked by a firewall.
 148 </p>
 149 <p>
 150 A custom file descriptor can be configured with the
 151 <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--sockfd" title='The "sockfd" property'><span class="type">"sockfd"</span></a> property. The socket will be closed when setting the
 152 element to READY by default. This behaviour can be
 153 overriden with the <a class="link" href="gst-plugins-good-plugins-udpsrc.html#GstUDPSrc--closefd" title='The "closefd" property'><span class="type">"closefd"</span></a> property, in which case the application
 154 is responsible for closing the file descriptor.
 155 </p>
 156 <p>
 157 </p>
 158 <div class="refsect2">
 159 <a name="idp21126032"></a><h3>Examples</h3>
 160 <div class="informalexample">
 161   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
 162     <tbody>
 163       <tr>
 164         <td class="listing_lines" align="right"><pre>1</pre></td>
 165         <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch <span class="gtkdoc opt">-</span>v udpsrc <span class="gtkdoc opt">!</span> fakesink dump<span class="gtkdoc opt">=</span><span class="number">1</span></pre></td>
 166       </tr>
 167     </tbody>
 168   </table>
 169 </div>
 170  A pipeline to read from the default port and dump the udp packets.
 171 To actually generate udp packets on the default port one can use the
 172 udpsink element. When running the following pipeline in another terminal, the
 173 above mentioned pipeline should dump data packets to the console.
 174 <div class="informalexample">
 175   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
 176     <tbody>
 177       <tr>
 178         <td class="listing_lines" align="right"><pre>1</pre></td>
 179         <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch <span class="gtkdoc opt">-</span>v audiotestsrc <span class="gtkdoc opt">!</span> udpsink</pre></td>
 180       </tr>
 181     </tbody>
 182   </table>
 183 </div>
 184
 185 <div class="informalexample">
 186   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
 187     <tbody>
 188       <tr>
 189         <td class="listing_lines" align="right"><pre>1</pre></td>
 190         <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch <span class="gtkdoc opt">-</span>v udpsrc port<span class="gtkdoc opt">=</span><span class="number">0</span> <span class="gtkdoc opt">!</span> fakesink</pre></td>
 191       </tr>
 192     </tbody>
 193   </table>
 194 </div>
 195  read udp packets from a free port.
 196 </div>
 197 <p>
 198 </p>
 199 <p>
 200 Last reviewed on 2007-09-20 (0.10.7)
 201 </p>
 202 <div class="refsynopsisdiv">
 203 <h2>Synopsis</h2>
 204 <div class="refsect2">
 205 <a name="idp20004624"></a><h3>Element Information</h3>
 206 <div class="variablelist"><table border="0">
 207 <col align="left" valign="top">
 208 <tbody>
 209 <tr>
 210 <td><p><span class="term">plugin</span></p></td>
 211 <td>
 212             <a class="link" href="gst-plugins-good-plugins-plugin-udp.html#plugin-udp">udp</a>
 213           </td>
 214 </tr>
 215 <tr>
 216 <td><p><span class="term">author</span></p></td>
 217 <td>Wim Taymans &lt;wim@fluendo.com&gt;, Thijs Vermeir &lt;thijs.vermeir@barco.com&gt;</td>
 218 </tr>
 219 <tr>
 220 <td><p><span class="term">class</span></p></td>
 221 <td>Source/Network</td>
 222 </tr>
 223 </tbody>
 224 </table></div>
 225 </div>
 226 <hr>
 227 <div class="refsect2">
 228 <a name="idp22477056"></a><h3>Element Pads</h3>
 229 <div class="variablelist"><table border="0">
 230 <col align="left" valign="top">
 231 <tbody>
 232 <tr>
 233 <td><p><span class="term">name</span></p></td>
 234 <td>src</td>
 235 </tr>
 236 <tr>
 237 <td><p><span class="term">direction</span></p></td>
 238 <td>source</td>
 239 </tr>
 240 <tr>
 241 <td><p><span class="term">presence</span></p></td>
 242 <td>always</td>
 243 </tr>
 244 <tr>
 245 <td><p><span class="term">details</span></p></td>
 246 <td>ANY</td>
 247 </tr>
 248 </tbody>
 249 </table></div>
 250 </div>
 251 </div>
 252 <p>
 253 </p>
 254 </div>
 255 <div class="refsect1">
 256 <a name="gst-plugins-good-plugins-udpsrc.details"></a><h2>Details</h2>
 257 <div class="refsect2">
 258 <a name="GstUDPSrc-struct"></a><h3>struct GstUDPSrc</h3>
 259 <pre class="programlisting">struct GstUDPSrc;</pre>
 260 <p>
 261 </p>
 262 </div>
 263 </div>
 264 <div class="refsect1">
 265 <a name="gst-plugins-good-plugins-udpsrc.property-details"></a><h2>Property Details</h2>
 266 <div class="refsect2">
 267 <a name="GstUDPSrc--caps"></a><h3>The <code class="literal">"caps"</code> property</h3>
 268 <pre class="programlisting">  "caps"                     <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a>*              : Read / Write</pre>
 269 <p>The caps of the source pad.</p>
 270 </div>
 271 <hr>
 272 <div class="refsect2">
 273 <a name="GstUDPSrc--multicast-group"></a><h3>The <code class="literal">"multicast-group"</code> property</h3>
 274 <pre class="programlisting">  "multicast-group"          <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>*                : Read / Write</pre>
 275 <p>The Address of multicast group to join.</p>
 276 <p>Default value: "0.0.0.0"</p>
 277 </div>
 278 <hr>
 279 <div class="refsect2">
 280 <a name="GstUDPSrc--port"></a><h3>The <code class="literal">"port"</code> property</h3>
 281 <pre class="programlisting">  "port"                     <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write</pre>
 282 <p>The port to receive the packets from, 0=allocate.</p>
 283 <p>Allowed values: [0,65535]</p>
 284 <p>Default value: 4951</p>
 285 </div>
 286 <hr>
 287 <div class="refsect2">
 288 <a name="GstUDPSrc--uri"></a><h3>The <code class="literal">"uri"</code> property</h3>
 289 <pre class="programlisting">  "uri"                      <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>*                : Read / Write</pre>
 290 <p>URI in the form of udp://multicast_group:port.</p>
 291 <p>Default value: "udp://0.0.0.0:4951"</p>
 292 </div>
 293 <hr>
 294 <div class="refsect2">
 295 <a name="GstUDPSrc--sockfd"></a><h3>The <code class="literal">"sockfd"</code> property</h3>
 296 <pre class="programlisting">  "sockfd"                   <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write</pre>
 297 <p>Socket to use for UDP reception. (-1 == allocate).</p>
 298 <p>Allowed values: &gt;= G_MAXULONG</p>
 299 <p>Default value: -1</p>
 300 </div>
 301 <hr>
 302 <div class="refsect2">
 303 <a name="GstUDPSrc--buffer-size"></a><h3>The <code class="literal">"buffer-size"</code> property</h3>
 304 <pre class="programlisting">  "buffer-size"              <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write</pre>
 305 <p>Size of the kernel receive buffer in bytes, 0=default.</p>
 306 <p>Allowed values: &gt;= 0</p>
 307 <p>Default value: 0</p>
 308 </div>
 309 <hr>
 310 <div class="refsect2">
 311 <a name="GstUDPSrc--timeout"></a><h3>The <code class="literal">"timeout"</code> property</h3>
 312 <pre class="programlisting">  "timeout"                  <span class="type">guint64</span>               : Read / Write</pre>
 313 <p>Post a message after timeout microseconds (0 = disabled).</p>
 314 <p>Default value: 0</p>
 315 </div>
 316 <hr>
 317 <div class="refsect2">
 318 <a name="GstUDPSrc--closefd"></a><h3>The <code class="literal">"closefd"</code> property</h3>
 319 <pre class="programlisting">  "closefd"                  <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
 320 <p>Close sockfd if passed as property on state change.</p>
 321 <p>Default value: TRUE</p>
 322 </div>
 323 <hr>
 324 <div class="refsect2">
 325 <a name="GstUDPSrc--skip-first-bytes"></a><h3>The <code class="literal">"skip-first-bytes"</code> property</h3>
 326 <pre class="programlisting">  "skip-first-bytes"         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read / Write</pre>
 327 <p>number of bytes to skip for each udp packet.</p>
 328 <p>Allowed values: &gt;= 0</p>
 329 <p>Default value: 0</p>
 330 </div>
 331 <hr>
 332 <div class="refsect2">
 333 <a name="GstUDPSrc--sock"></a><h3>The <code class="literal">"sock"</code> property</h3>
 334 <pre class="programlisting">  "sock"                     <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a>                  : Read</pre>
 335 <p>Socket currently in use for UDP reception. (-1 = no socket).</p>
 336 <p>Allowed values: &gt;= G_MAXULONG</p>
 337 <p>Default value: -1</p>
 338 </div>
 339 <hr>
 340 <div class="refsect2">
 341 <a name="GstUDPSrc--auto-multicast"></a><h3>The <code class="literal">"auto-multicast"</code> property</h3>
 342 <pre class="programlisting">  "auto-multicast"           <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
 343 <p>Automatically join/leave multicast groups.</p>
 344 <p>Default value: TRUE</p>
 345 </div>
 346 <hr>
 347 <div class="refsect2">
 348 <a name="GstUDPSrc--multicast-iface"></a><h3>The <code class="literal">"multicast-iface"</code> property</h3>
 349 <pre class="programlisting">  "multicast-iface"          <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>*                : Read / Write</pre>
 350 <p>The network interface on which to join the multicast group.</p>
 351 <p>Default value: NULL</p>
 352 </div>
 353 <hr>
 354 <div class="refsect2">
 355 <a name="GstUDPSrc--reuse"></a><h3>The <code class="literal">"reuse"</code> property</h3>
 356 <pre class="programlisting">  "reuse"                    <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
 357 <p>Enable reuse of the port.</p>
 358 <p>Default value: TRUE</p>
 359 </div>
 360 </div>
 361 <div class="refsect1">
 362 <a name="gst-plugins-good-plugins-udpsrc.see-also"></a><h2>See Also</h2>
 363 udpsink, multifdsink
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