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  20 <th width="100%" align="center">GStreamer Base Plugins 0.10 Library Reference Manual</th>
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  24 <a href="#gst-plugins-base-libs-appsrc.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gst-plugins-base-libs-appsrc.description" class="shortcut">Description</a>
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  29 <div class="refentry">
  30 <a name="gst-plugins-base-libs-appsrc"></a><div class="titlepage"></div>
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  33 <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-appsrc.top_of_page"></a>appsrc</span></h2>
  34 <p>appsrc — Easy way for applications to inject buffers into a
  35     pipeline</p>
  36 </td>
  37 <td valign="top" align="right"></td>
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  39 <div class="refsynopsisdiv">
  40 <a name="gst-plugins-base-libs-appsrc.synopsis"></a><h2>Synopsis</h2>
  41 <pre class="synopsis">
  42 #include &lt;gst/app/gstappsrc.h&gt;
  43
  44 struct              <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc">GstAppSrc</a>;
  45 enum                <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType">GstAppStreamType</a>;
  46 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-caps" title="gst_app_src_set_caps ()">gst_app_src_set_caps</a>                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  47                                                          <em class="parameter"><code>const <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
  48 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> *           <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-caps" title="gst_app_src_get_caps ()">gst_app_src_get_caps</a>                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);
  49 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-latency" title="gst_app_src_get_latency ()">gst_app_src_get_latency</a>             (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  50                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *min</code></em>,
  51                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *max</code></em>);
  52 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-latency" title="gst_app_src_set_latency ()">gst_app_src_set_latency</a>             (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  53                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> min</code></em>,
  54                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> max</code></em>);
  55 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-size" title="gst_app_src_set_size ()">gst_app_src_set_size</a>                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  56                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> size</code></em>);
  57 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>              <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-size" title="gst_app_src_get_size ()">gst_app_src_get_size</a>                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);
  58 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-stream-type" title="gst_app_src_set_stream_type ()">gst_app_src_set_stream_type</a>         (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  59                                                          <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="type">GstAppStreamType</span></a> type</code></em>);
  60 <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="returnvalue">GstAppStreamType</span></a>    <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-stream-type" title="gst_app_src_get_stream_type ()">gst_app_src_get_stream_type</a>         (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);
  61 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-max-bytes" title="gst_app_src_set_max_bytes ()">gst_app_src_set_max_bytes</a>           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  62                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> max</code></em>);
  63 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>             <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-get-max-bytes" title="gst_app_src_get_max_bytes ()">gst_app_src_get_max_bytes</a>           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);
  64 <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-appsrc.html#gst-app-src-get-emit-signals" title="gst_app_src_get_emit_signals ()">gst_app_src_get_emit_signals</a>        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);
  65 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-emit-signals" title="gst_app_src_set_emit_signals ()">gst_app_src_set_emit_signals</a>        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  66                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> emit</code></em>);
  67                     <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrcCallbacks" title="GstAppSrcCallbacks">GstAppSrcCallbacks</a>;
  68 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-callbacks" title="gst_app_src_set_callbacks ()">gst_app_src_set_callbacks</a>           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  69                                                          <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrcCallbacks" title="GstAppSrcCallbacks"><span class="type">GstAppSrcCallbacks</span></a> *callbacks</code></em>,
  70                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
  71                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);
  72 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-push-buffer" title="gst_app_src_push_buffer ()">gst_app_src_push_buffer</a>             (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
  73                                                          <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);
  74 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-end-of-stream" title="gst_app_src_end_of_stream ()">gst_app_src_end_of_stream</a>           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);
  75 </pre>
  76 </div>
  77 <div class="refsect1">
  78 <a name="gst-plugins-base-libs-appsrc.description"></a><h2>Description</h2>
  79 <p>
  80 The appsrc element can be used by applications to insert data into a
  81 GStreamer pipeline. Unlike most GStreamer elements, Appsrc provides
  82 external API functions.
  83 </p>
  84 <p>
  85 appsrc can be used by linking with the libgstapp library to access the
  86 methods directly or by using the appsrc action signals.
  87 </p>
  88 <p>
  89 Before operating appsrc, the caps property must be set to a fixed caps
  90 describing the format of the data that will be pushed with appsrc. An
  91 exception to this is when pushing buffers with unknown caps, in which case no
  92 caps should be set. This is typically true of file-like sources that push raw
  93 byte buffers.
  94 </p>
  95 <p>
  96 The main way of handing data to the appsrc element is by calling the
  97 <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-push-buffer" title="gst_app_src_push_buffer ()"><code class="function">gst_app_src_push_buffer()</code></a> method or by emiting the push-buffer action signal.
  98 This will put the buffer onto a queue from which appsrc will read from in its
  99 streaming thread. It is important to note that data transport will not happen
 100 from the thread that performed the push-buffer call.
 101 </p>
 102 <p>
 103 The "max-bytes" property controls how much data can be queued in appsrc
 104 before appsrc considers the queue full. A filled internal queue will always
 105 signal the "enough-data" signal, which signals the application that it should
 106 stop pushing data into appsrc. The "block" property will cause appsrc to
 107 block the push-buffer method until free data becomes available again.
 108 </p>
 109 <p>
 110 When the internal queue is running out of data, the "need-data" signal is
 111 emited, which signals the application that it should start pushing more data
 112 into appsrc.
 113 </p>
 114 <p>
 115 In addition to the "need-data" and "enough-data" signals, appsrc can emit the
 116 "seek-data" signal when the "stream-mode" property is set to "seekable" or
 117 "random-access". The signal argument will contain the new desired position in
 118 the stream expressed in the unit set with the "format" property. After
 119 receiving the seek-data signal, the application should push-buffers from the
 120 new position.
 121 </p>
 122 <p>
 123 These signals allow the application to operate the appsrc in two different
 124 ways:
 125 </p>
 126 <p>
 127 The push model, in which the application repeadedly calls the push-buffer method
 128 with a new buffer. Optionally, the queue size in the appsrc can be controlled
 129 with the enough-data and need-data signals by respectively stopping/starting
 130 the push-buffer calls. This is a typical mode of operation for the
 131 stream-type "stream" and "seekable". Use this model when implementing various
 132 network protocols or hardware devices.
 133 </p>
 134 <p>
 135 The pull model where the need-data signal triggers the next push-buffer call.
 136 This mode is typically used in the "random-access" stream-type. Use this
 137 model for file access or other randomly accessable sources. In this mode, a
 138 buffer of exactly the amount of bytes given by the need-data signal should be
 139 pushed into appsrc.
 140 </p>
 141 <p>
 142 In all modes, the size property on appsrc should contain the total stream
 143 size in bytes. Setting this property is mandatory in the random-access mode.
 144 For the stream and seekable modes, setting this property is optional but
 145 recommended.
 146 </p>
 147 <p>
 148 When the application is finished pushing data into appsrc, it should call
 149 <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-end-of-stream" title="gst_app_src_end_of_stream ()"><code class="function">gst_app_src_end_of_stream()</code></a> or emit the end-of-stream action signal. After
 150 this call, no more buffers can be pushed into appsrc until a flushing seek
 151 happened or the state of the appsrc has gone through READY.
 152 </p>
 153 <p>
 154 Last reviewed on 2008-12-17 (0.10.10)
 155 </p>
 156 </div>
 157 <div class="refsect1">
 158 <a name="gst-plugins-base-libs-appsrc.details"></a><h2>Details</h2>
 159 <div class="refsect2">
 160 <a name="GstAppSrc"></a><h3>struct GstAppSrc</h3>
 161 <pre class="programlisting">struct GstAppSrc {
 162   GstBaseSrc basesrc;
 163 };
 164 </pre>
 165 </div>
 166 <hr>
 167 <div class="refsect2">
 168 <a name="GstAppStreamType"></a><h3>enum GstAppStreamType</h3>
 169 <pre class="programlisting">typedef enum
 170 {
 171   GST_APP_STREAM_TYPE_STREAM,
 172   GST_APP_STREAM_TYPE_SEEKABLE,
 173   GST_APP_STREAM_TYPE_RANDOM_ACCESS
 174 } GstAppStreamType;
 175 </pre>
 176 <p>
 177 The stream type.
 178 </p>
 179 <div class="variablelist"><table border="0">
 180 <col align="left" valign="top">
 181 <tbody>
 182 <tr>
 183 <td><p><a name="GST-APP-STREAM-TYPE-STREAM:CAPS"></a><span class="term"><code class="literal">GST_APP_STREAM_TYPE_STREAM</code></span></p></td>
 184 <td>No seeking is supported in the stream, such as a
 185 live stream.
 186 </td>
 187 </tr>
 188 <tr>
 189 <td><p><a name="GST-APP-STREAM-TYPE-SEEKABLE:CAPS"></a><span class="term"><code class="literal">GST_APP_STREAM_TYPE_SEEKABLE</code></span></p></td>
 190 <td>The stream is seekable but seeking might not
 191 be very fast, such as data from a webserver.
 192 </td>
 193 </tr>
 194 <tr>
 195 <td><p><a name="GST-APP-STREAM-TYPE-RANDOM-ACCESS:CAPS"></a><span class="term"><code class="literal">GST_APP_STREAM_TYPE_RANDOM_ACCESS</code></span></p></td>
 196 <td>The stream is seekable and seeking is fast,
 197 such as in a local file.
 198 </td>
 199 </tr>
 200 </tbody>
 201 </table></div>
 202 </div>
 203 <hr>
 204 <div class="refsect2">
 205 <a name="gst-app-src-set-caps"></a><h3>gst_app_src_set_caps ()</h3>
 206 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_set_caps                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 207                                                          <em class="parameter"><code>const <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
 208 <p>
 209 Set the capabilities on the appsrc element.  This function takes
 210 a copy of the caps structure. After calling this method, the source will
 211 only produce caps that match <em class="parameter"><code>caps</code></em>. <em class="parameter"><code>caps</code></em> must be fixed and the caps on the
 212 buffers must match the caps or left NULL.
 213 </p>
 214 <div class="variablelist"><table border="0">
 215 <col align="left" valign="top">
 216 <tbody>
 217 <tr>
 218 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 219 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 220 </td>
 221 </tr>
 222 <tr>
 223 <td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
 224 <td>caps to set</td>
 225 </tr>
 226 </tbody>
 227 </table></div>
 228 <p class="since">Since 0.10.22</p>
 229 </div>
 230 <hr>
 231 <div class="refsect2">
 232 <a name="gst-app-src-get-caps"></a><h3>gst_app_src_get_caps ()</h3>
 233 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> *           gst_app_src_get_caps                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
 234 <p>
 235 Get the configured caps on <em class="parameter"><code>appsrc</code></em>.
 236 </p>
 237 <div class="variablelist"><table border="0">
 238 <col align="left" valign="top">
 239 <tbody>
 240 <tr>
 241 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 242 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 243 </td>
 244 </tr>
 245 <tr>
 246 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 247 <td>the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> produced by the source. <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#gst-caps-unref"><code class="function">gst_caps_unref()</code></a> after usage.</td>
 248 </tr>
 249 </tbody>
 250 </table></div>
 251 <p class="since">Since 0.10.22</p>
 252 </div>
 253 <hr>
 254 <div class="refsect2">
 255 <a name="gst-app-src-get-latency"></a><h3>gst_app_src_get_latency ()</h3>
 256 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_get_latency             (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 257                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *min</code></em>,
 258                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> *max</code></em>);</pre>
 259 <p>
 260 Retrieve the min and max latencies in <em class="parameter"><code>min</code></em> and <em class="parameter"><code>max</code></em> respectively.
 261 </p>
 262 <div class="variablelist"><table border="0">
 263 <col align="left" valign="top">
 264 <tbody>
 265 <tr>
 266 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 267 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 268 </td>
 269 </tr>
 270 <tr>
 271 <td><p><span class="term"><em class="parameter"><code>min</code></em> :</span></p></td>
 272 <td>the min latency</td>
 273 </tr>
 274 <tr>
 275 <td><p><span class="term"><em class="parameter"><code>max</code></em> :</span></p></td>
 276 <td>the min latency</td>
 277 </tr>
 278 </tbody>
 279 </table></div>
 280 <p class="since">Since 0.10.22</p>
 281 </div>
 282 <hr>
 283 <div class="refsect2">
 284 <a name="gst-app-src-set-latency"></a><h3>gst_app_src_set_latency ()</h3>
 285 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_set_latency             (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 286                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> min</code></em>,
 287                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> max</code></em>);</pre>
 288 <p>
 289 Configure the <em class="parameter"><code>min</code></em> and <em class="parameter"><code>max</code></em> latency in <em class="parameter"><code>src</code></em>. If <em class="parameter"><code>min</code></em> is set to -1, the
 290 default latency calculations for pseudo-live sources will be used.
 291 </p>
 292 <div class="variablelist"><table border="0">
 293 <col align="left" valign="top">
 294 <tbody>
 295 <tr>
 296 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 297 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 298 </td>
 299 </tr>
 300 <tr>
 301 <td><p><span class="term"><em class="parameter"><code>min</code></em> :</span></p></td>
 302 <td>the min latency</td>
 303 </tr>
 304 <tr>
 305 <td><p><span class="term"><em class="parameter"><code>max</code></em> :</span></p></td>
 306 <td>the min latency</td>
 307 </tr>
 308 </tbody>
 309 </table></div>
 310 <p class="since">Since 0.10.22</p>
 311 </div>
 312 <hr>
 313 <div class="refsect2">
 314 <a name="gst-app-src-set-size"></a><h3>gst_app_src_set_size ()</h3>
 315 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_set_size                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 316                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> size</code></em>);</pre>
 317 <p>
 318 Set the size of the stream in bytes. A value of -1 means that the size is
 319 not known.
 320 </p>
 321 <div class="variablelist"><table border="0">
 322 <col align="left" valign="top">
 323 <tbody>
 324 <tr>
 325 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 326 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 327 </td>
 328 </tr>
 329 <tr>
 330 <td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
 331 <td>the size to set</td>
 332 </tr>
 333 </tbody>
 334 </table></div>
 335 <p class="since">Since 0.10.22</p>
 336 </div>
 337 <hr>
 338 <div class="refsect2">
 339 <a name="gst-app-src-get-size"></a><h3>gst_app_src_get_size ()</h3>
 340 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>              gst_app_src_get_size                (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
 341 <p>
 342 Get the size of the stream in bytes. A value of -1 means that the size is
 343 not known.
 344 </p>
 345 <div class="variablelist"><table border="0">
 346 <col align="left" valign="top">
 347 <tbody>
 348 <tr>
 349 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 350 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 351 </td>
 352 </tr>
 353 <tr>
 354 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 355 <td>the size of the stream previously set with <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-size" title="gst_app_src_set_size ()"><code class="function">gst_app_src_set_size()</code></a>;</td>
 356 </tr>
 357 </tbody>
 358 </table></div>
 359 <p class="since">Since 0.10.22</p>
 360 </div>
 361 <hr>
 362 <div class="refsect2">
 363 <a name="gst-app-src-set-stream-type"></a><h3>gst_app_src_set_stream_type ()</h3>
 364 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_set_stream_type         (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 365                                                          <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="type">GstAppStreamType</span></a> type</code></em>);</pre>
 366 <p>
 367 Set the stream type on <em class="parameter"><code>appsrc</code></em>. For seekable streams, the "seek" signal must
 368 be connected to.
 369 </p>
 370 <p>
 371 A stream_type stream
 372 </p>
 373 <div class="variablelist"><table border="0">
 374 <col align="left" valign="top">
 375 <tbody>
 376 <tr>
 377 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 378 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 379 </td>
 380 </tr>
 381 <tr>
 382 <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
 383 <td>the new state</td>
 384 </tr>
 385 </tbody>
 386 </table></div>
 387 <p class="since">Since 0.10.22</p>
 388 </div>
 389 <hr>
 390 <div class="refsect2">
 391 <a name="gst-app-src-get-stream-type"></a><h3>gst_app_src_get_stream_type ()</h3>
 392 <pre class="programlisting"><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppStreamType" title="enum GstAppStreamType"><span class="returnvalue">GstAppStreamType</span></a>    gst_app_src_get_stream_type         (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
 393 <p>
 394 Get the stream type. Control the stream type of <em class="parameter"><code>appsrc</code></em>
 395 with <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-stream-type" title="gst_app_src_set_stream_type ()"><code class="function">gst_app_src_set_stream_type()</code></a>.
 396 </p>
 397 <div class="variablelist"><table border="0">
 398 <col align="left" valign="top">
 399 <tbody>
 400 <tr>
 401 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 402 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 403 </td>
 404 </tr>
 405 <tr>
 406 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 407 <td>the stream type.</td>
 408 </tr>
 409 </tbody>
 410 </table></div>
 411 <p class="since">Since 0.10.22</p>
 412 </div>
 413 <hr>
 414 <div class="refsect2">
 415 <a name="gst-app-src-set-max-bytes"></a><h3>gst_app_src_set_max_bytes ()</h3>
 416 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_set_max_bytes           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 417                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> max</code></em>);</pre>
 418 <p>
 419 Set the maximum amount of bytes that can be queued in <em class="parameter"><code>appsrc</code></em>.
 420 After the maximum amount of bytes are queued, <em class="parameter"><code>appsrc</code></em> will emit the
 421 "enough-data" signal.
 422 </p>
 423 <div class="variablelist"><table border="0">
 424 <col align="left" valign="top">
 425 <tbody>
 426 <tr>
 427 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 428 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 429 </td>
 430 </tr>
 431 <tr>
 432 <td><p><span class="term"><em class="parameter"><code>max</code></em> :</span></p></td>
 433 <td>the maximum number of bytes to queue</td>
 434 </tr>
 435 </tbody>
 436 </table></div>
 437 <p class="since">Since 0.10.22</p>
 438 </div>
 439 <hr>
 440 <div class="refsect2">
 441 <a name="gst-app-src-get-max-bytes"></a><h3>gst_app_src_get_max_bytes ()</h3>
 442 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>             gst_app_src_get_max_bytes           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
 443 <p>
 444 Get the maximum amount of bytes that can be queued in <em class="parameter"><code>appsrc</code></em>.
 445 </p>
 446 <div class="variablelist"><table border="0">
 447 <col align="left" valign="top">
 448 <tbody>
 449 <tr>
 450 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 451 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 452 </td>
 453 </tr>
 454 <tr>
 455 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 456 <td>The maximum amount of bytes that can be queued.</td>
 457 </tr>
 458 </tbody>
 459 </table></div>
 460 <p class="since">Since 0.10.22</p>
 461 </div>
 462 <hr>
 463 <div class="refsect2">
 464 <a name="gst-app-src-get-emit-signals"></a><h3>gst_app_src_get_emit_signals ()</h3>
 465 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_app_src_get_emit_signals        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
 466 <p>
 467 Check if appsrc will emit the "new-preroll" and "new-buffer" signals.
 468 </p>
 469 <div class="variablelist"><table border="0">
 470 <col align="left" valign="top">
 471 <tbody>
 472 <tr>
 473 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 474 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 475 </td>
 476 </tr>
 477 <tr>
 478 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 479 <td>
 480 <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>appsrc</code></em> is emiting the "new-preroll" and "new-buffer"
 481 signals.</td>
 482 </tr>
 483 </tbody>
 484 </table></div>
 485 <p class="since">Since 0.10.23</p>
 486 </div>
 487 <hr>
 488 <div class="refsect2">
 489 <a name="gst-app-src-set-emit-signals"></a><h3>gst_app_src_set_emit_signals ()</h3>
 490 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_set_emit_signals        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 491                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> emit</code></em>);</pre>
 492 <p>
 493 Make appsrc emit the "new-preroll" and "new-buffer" signals. This option is
 494 by default disabled because signal emission is expensive and unneeded when
 495 the application prefers to operate in pull mode.
 496 </p>
 497 <div class="variablelist"><table border="0">
 498 <col align="left" valign="top">
 499 <tbody>
 500 <tr>
 501 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 502 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 503 </td>
 504 </tr>
 505 <tr>
 506 <td><p><span class="term"><em class="parameter"><code>emit</code></em> :</span></p></td>
 507 <td>the new state</td>
 508 </tr>
 509 </tbody>
 510 </table></div>
 511 <p class="since">Since 0.10.23</p>
 512 </div>
 513 <hr>
 514 <div class="refsect2">
 515 <a name="GstAppSrcCallbacks"></a><h3>GstAppSrcCallbacks</h3>
 516 <pre class="programlisting">typedef struct {
 517   void      (*need_data)    (GstAppSrc *src, guint length, gpointer user_data);
 518   void      (*enough_data)  (GstAppSrc *src, gpointer user_data);
 519   gboolean  (*seek_data)    (GstAppSrc *src, guint64 offset, gpointer user_data);
 520 } GstAppSrcCallbacks;
 521 </pre>
 522 <p>
 523 A set of callbacks that can be installed on the appsrc with
 524 <a class="link" href="gst-plugins-base-libs-appsrc.html#gst-app-src-set-callbacks" title="gst_app_src_set_callbacks ()"><code class="function">gst_app_src_set_callbacks()</code></a>.
 525 </p>
 526 <div class="variablelist"><table border="0">
 527 <col align="left" valign="top">
 528 <tbody>
 529 <tr>
 530 <td><p><span class="term"><em class="structfield"><code><a name="GstAppSrcCallbacks.need-data"></a>need_data</code></em> ()</span></p></td>
 531 <td>Called when the appsrc needs more data. A buffer or EOS should be
 532 pushed to appsrc from this thread or another thread. <em class="parameter"><code>length</code></em> is just a hint
 533 and when it is set to -1, any number of bytes can be pushed into <em class="parameter"><code>appsrc</code></em>.</td>
 534 </tr>
 535 <tr>
 536 <td><p><span class="term"><em class="structfield"><code><a name="GstAppSrcCallbacks.enough-data"></a>enough_data</code></em> ()</span></p></td>
 537 <td>Called when appsrc has enough data. It is recommended that the
 538 application stops calling push-buffer until the need_data callback is
 539 emited again to avoid excessive buffer queueing.</td>
 540 </tr>
 541 <tr>
 542 <td><p><span class="term"><em class="structfield"><code><a name="GstAppSrcCallbacks.seek-data"></a>seek_data</code></em> ()</span></p></td>
 543 <td>Called when a seek should be performed to the offset.
 544 The next push-buffer should produce buffers from the new <em class="parameter"><code>offset</code></em>.
 545 This callback is only called for seekable stream types.</td>
 546 </tr>
 547 </tbody>
 548 </table></div>
 549 <p class="since">Since 0.10.23</p>
 550 </div>
 551 <hr>
 552 <div class="refsect2">
 553 <a name="gst-app-src-set-callbacks"></a><h3>gst_app_src_set_callbacks ()</h3>
 554 <pre class="programlisting"><span class="returnvalue">void</span>                gst_app_src_set_callbacks           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 555                                                          <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrcCallbacks" title="GstAppSrcCallbacks"><span class="type">GstAppSrcCallbacks</span></a> *callbacks</code></em>,
 556                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
 557                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
 558 <p>
 559 Set callbacks which will be executed when data is needed, enough data has
 560 been collected or when a seek should be performed.
 561 This is an alternative to using the signals, it has lower overhead and is thus
 562 less expensive, but also less flexible.
 563 </p>
 564 <p>
 565 If callbacks are installed, no signals will be emited for performance
 566 reasons.
 567 </p>
 568 <div class="variablelist"><table border="0">
 569 <col align="left" valign="top">
 570 <tbody>
 571 <tr>
 572 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 573 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 574 </td>
 575 </tr>
 576 <tr>
 577 <td><p><span class="term"><em class="parameter"><code>callbacks</code></em> :</span></p></td>
 578 <td>the callbacks</td>
 579 </tr>
 580 <tr>
 581 <td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
 582 <td>a user_data argument for the callbacks</td>
 583 </tr>
 584 <tr>
 585 <td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
 586 <td>a destroy notify function</td>
 587 </tr>
 588 </tbody>
 589 </table></div>
 590 <p class="since">Since 0.10.23</p>
 591 </div>
 592 <hr>
 593 <div class="refsect2">
 594 <a name="gst-app-src-push-buffer"></a><h3>gst_app_src_push_buffer ()</h3>
 595 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       gst_app_src_push_buffer             (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>,
 596                                                          <em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
 597 <p>
 598 Adds a buffer to the queue of buffers that the appsrc element will
 599 push to its source pad.  This function takes ownership of the buffer.
 600 </p>
 601 <p>
 602 When the block property is TRUE, this function can block until free
 603 space becomes available in the queue.
 604 </p>
 605 <div class="variablelist"><table border="0">
 606 <col align="left" valign="top">
 607 <tbody>
 608 <tr>
 609 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 610 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 611 </td>
 612 </tr>
 613 <tr>
 614 <td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
 615 <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> to push</td>
 616 </tr>
 617 <tr>
 618 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 619 <td>
 620 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> when the buffer was successfuly queued.
 621 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-WRONG-STATE:CAPS"><span class="type">GST_FLOW_WRONG_STATE</span></a> when <em class="parameter"><code>appsrc</code></em> is not PAUSED or PLAYING.
 622 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-UNEXPECTED:CAPS"><span class="type">GST_FLOW_UNEXPECTED</span></a> when EOS occured.</td>
 623 </tr>
 624 </tbody>
 625 </table></div>
 626 <p class="since">Since 0.10.22</p>
 627 </div>
 628 <hr>
 629 <div class="refsect2">
 630 <a name="gst-app-src-end-of-stream"></a><h3>gst_app_src_end_of_stream ()</h3>
 631 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       gst_app_src_end_of_stream           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a> *appsrc</code></em>);</pre>
 632 <p>
 633 Indicates to the appsrc element that the last buffer queued in the
 634 element is the last buffer of the stream.
 635 </p>
 636 <div class="variablelist"><table border="0">
 637 <col align="left" valign="top">
 638 <tbody>
 639 <tr>
 640 <td><p><span class="term"><em class="parameter"><code>appsrc</code></em> :</span></p></td>
 641 <td>a <a class="link" href="gst-plugins-base-libs-appsrc.html#GstAppSrc" title="struct GstAppSrc"><span class="type">GstAppSrc</span></a>
 642 </td>
 643 </tr>
 644 <tr>
 645 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 646 <td>
 647 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> when the EOS was successfuly queued.
 648 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GST-FLOW-WRONG-STATE:CAPS"><span class="type">GST_FLOW_WRONG_STATE</span></a> when <em class="parameter"><code>appsrc</code></em> is not PAUSED or PLAYING.</td>
 649 </tr>
 650 </tbody>
 651 </table></div>
 652 <p class="since">Since 0.10.22</p>
 653 </div>
 654 </div>
 655 <div class="refsect1">
 656 <a name="gst-plugins-base-libs-appsrc.see-also"></a><h2>See Also</h2>
 657 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html"><span class="type">GstBaseSrc</span></a>, appsink
 658 </div>
 659 </div>
 660 <div class="footer">
 661 <hr>
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