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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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                  <a href="#gst-plugins-base-libs-gstrtppayloads.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstrtppayloads"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstrtppayloads.top_of_page"></a>gstrtppayloads</span></h2>
<p>gstrtppayloads — Helper methods for dealing with RTP payloads</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstrtppayloads.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gst/rtp/gstrtppayload.h&gt;

enum                <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayload" title="enum GstRTPPayload">GstRTPPayload</a>;
#define             <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GST-RTP-PAYLOAD-IS-DYNAMIC:CAPS" title="GST_RTP_PAYLOAD_IS_DYNAMIC()">GST_RTP_PAYLOAD_IS_DYNAMIC</a>          (pt)
struct              <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo">GstRTPPayloadInfo</a>;
const <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="returnvalue">GstRTPPayloadInfo</span></a> * <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#gst-rtp-payload-info-for-name" title="gst_rtp_payload_info_for_name ()">gst_rtp_payload_info_for_name</a> (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *media</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *encoding_name</code></em>);
const <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="returnvalue">GstRTPPayloadInfo</span></a> * <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#gst-rtp-payload-info-for-pt" title="gst_rtp_payload_info_for_pt ()">gst_rtp_payload_info_for_pt</a>   (<em class="parameter"><code><span class="type">guint8</span> payload_type</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstrtppayloads.description"></a><h2>Description</h2>
<p>
</p>
<div class="refsect2">
<a name="id-1.2.9.8.4.2.1"></a><p>
The GstRTPPayloads helper functions makes it easy to deal with static and dynamic
payloads. Its main purpose is to retrieve properties such as the default clock-rate 
and get session bandwidth information.
</p>
</div>
<p>
</p>
<p>
Last reviewed on 2007-10-01 (0.10.15)
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstrtppayloads.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstRTPPayload"></a><h3>enum GstRTPPayload</h3>
<pre class="programlisting">typedef enum {
  /* Audio: */
  GST_RTP_PAYLOAD_PCMU = 0,
  GST_RTP_PAYLOAD_1016 = 1, /* RFC 3551 says reserved */
  GST_RTP_PAYLOAD_G721 = 2, /* RFC 3551 says reserved */
  GST_RTP_PAYLOAD_GSM = 3,
  GST_RTP_PAYLOAD_G723 = 4,
  GST_RTP_PAYLOAD_DVI4_8000 = 5,
  GST_RTP_PAYLOAD_DVI4_16000 = 6,
  GST_RTP_PAYLOAD_LPC = 7,
  GST_RTP_PAYLOAD_PCMA = 8,
  GST_RTP_PAYLOAD_G722 = 9,
  GST_RTP_PAYLOAD_L16_STEREO = 10,
  GST_RTP_PAYLOAD_L16_MONO = 11,
  GST_RTP_PAYLOAD_QCELP = 12,
  GST_RTP_PAYLOAD_CN = 13,
  GST_RTP_PAYLOAD_MPA = 14,
  GST_RTP_PAYLOAD_G728 = 15,
  GST_RTP_PAYLOAD_DVI4_11025 = 16,
  GST_RTP_PAYLOAD_DVI4_22050 = 17,
  GST_RTP_PAYLOAD_G729 = 18,

  /* Video: */

  GST_RTP_PAYLOAD_CELLB = 25,
  GST_RTP_PAYLOAD_JPEG = 26,
  GST_RTP_PAYLOAD_NV = 28,
  GST_RTP_PAYLOAD_H261 = 31,
  GST_RTP_PAYLOAD_MPV = 32,
  GST_RTP_PAYLOAD_MP2T = 33,
  GST_RTP_PAYLOAD_H263 = 34,

  /* BOTH */
} GstRTPPayload;
</pre>
<p>
Standard predefined fixed payload types.
</p>
<p>
The official list is at:
http://www.iana.org/assignments/rtp-parameters
</p>
<p>
Audio:
reserved: 19
unassigned: 20-23,
</p>
<p>
Video:
unassigned: 24, 27, 29, 30, 35-71, 77-95
Reserved for RTCP conflict avoidance: 72-76
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-PCMU:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_PCMU</code></span></p></td>
<td>ITU-T G.711. mu-law audio (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-1016:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_1016</code></span></p></td>
<td>RFC 3551 says reserved
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-G721:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_G721</code></span></p></td>
<td>RFC 3551 says reserved
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-GSM:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_GSM</code></span></p></td>
<td>GSM audio
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-G723:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_G723</code></span></p></td>
<td>ITU G.723.1 audio
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-DVI4-8000:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_DVI4_8000</code></span></p></td>
<td>IMA ADPCM wave type (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-DVI4-16000:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_DVI4_16000</code></span></p></td>
<td>IMA ADPCM wave type (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-LPC:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_LPC</code></span></p></td>
<td>experimental linear predictive encoding
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-PCMA:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_PCMA</code></span></p></td>
<td>ITU-T G.711 A-law audio (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-G722:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_G722</code></span></p></td>
<td>ITU-T G.722 (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-L16-STEREO:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_L16_STEREO</code></span></p></td>
<td>stereo PCM
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-L16-MONO:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_L16_MONO</code></span></p></td>
<td>mono PCM
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-QCELP:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_QCELP</code></span></p></td>
<td>EIA &amp; TIA standard IS-733
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-CN:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_CN</code></span></p></td>
<td>Comfort Noise (RFC 3389)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-MPA:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_MPA</code></span></p></td>
<td>Audio MPEG 1-3.
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-G728:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_G728</code></span></p></td>
<td>ITU-T G.728 Speech coder (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-DVI4-11025:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_DVI4_11025</code></span></p></td>
<td>IMA ADPCM wave type (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-DVI4-22050:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_DVI4_22050</code></span></p></td>
<td>IMA ADPCM wave type (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-G729:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_G729</code></span></p></td>
<td>ITU-T G.729 Speech coder (RFC 3551)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-CELLB:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_CELLB</code></span></p></td>
<td>See RFC 2029
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-JPEG:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_JPEG</code></span></p></td>
<td>ISO Standards 10918-1 and 10918-2 (RFC 2435)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-NV:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_NV</code></span></p></td>
<td>nv encoding by Ron Frederick
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-H261:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_H261</code></span></p></td>
<td>ITU-T Recommendation H.261 (RFC 2032)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-MPV:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_MPV</code></span></p></td>
<td>Video MPEG 1 &amp; 2 (RFC 2250)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-MP2T:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_MP2T</code></span></p></td>
<td>MPEG-2 transport stream (RFC 2250)
</td>
</tr>
<tr>
<td><p><a name="GST-RTP-PAYLOAD-H263:CAPS"></a><span class="term"><code class="literal">GST_RTP_PAYLOAD_H263</code></span></p></td>
<td>Video H263 (RFC 2190)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-RTP-PAYLOAD-IS-DYNAMIC:CAPS"></a><h3>GST_RTP_PAYLOAD_IS_DYNAMIC()</h3>
<pre class="programlisting">#define GST_RTP_PAYLOAD_IS_DYNAMIC(pt) ((pt) &gt;= 96 &amp;&amp; (pt) &lt;= 127)
</pre>
<p>
Check if <em class="parameter"><code>pt</code></em> is a dynamic payload type.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pt</code></em> :</span></p></td>
<td>a payload type</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstRTPPayloadInfo"></a><h3>struct GstRTPPayloadInfo</h3>
<pre class="programlisting">struct GstRTPPayloadInfo {
  guint8       payload_type;
  const gchar *media;
  const gchar *encoding_name;
  guint        clock_rate;
  const gchar *encoding_parameters;
  guint        bitrate;
};
</pre>
<p>
Structure holding default payload type information.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><span class="type">guint8</span> <em class="structfield"><code><a name="GstRTPPayloadInfo.payload-type"></a>payload_type</code></em>;</span></p></td>
<td>payload type, -1 means dynamic</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GstRTPPayloadInfo.media"></a>media</code></em>;</span></p></td>
<td>the media type(s), usually "audio", "video", "application", "text",
"message".</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GstRTPPayloadInfo.encoding-name"></a>encoding_name</code></em>;</span></p></td>
<td>the encoding name of <em class="parameter"><code>pt</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstRTPPayloadInfo.clock-rate"></a>clock_rate</code></em>;</span></p></td>
<td>default clock rate, 0 = unknown/variable</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GstRTPPayloadInfo.encoding-parameters"></a>encoding_parameters</code></em>;</span></p></td>
<td>encoding parameters. For audio this is the number of
channels. NULL = not applicable.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstRTPPayloadInfo.bitrate"></a>bitrate</code></em>;</span></p></td>
<td>the bitrate of the media. 0 = unknown/variable.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-rtp-payload-info-for-name"></a><h3>gst_rtp_payload_info_for_name ()</h3>
<pre class="programlisting">const <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="returnvalue">GstRTPPayloadInfo</span></a> * gst_rtp_payload_info_for_name (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *media</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *encoding_name</code></em>);</pre>
<p>
Get the <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="type">GstRTPPayloadInfo</span></a> for <em class="parameter"><code>media</code></em> and <em class="parameter"><code>encoding_name</code></em>. This function is
mostly used to get the default clock-rate and bandwidth for dynamic payload
types specified with <em class="parameter"><code>media</code></em> and <em class="parameter"><code>encoding</code></em> name.
</p>
<p>
The search for <em class="parameter"><code>encoding_name</code></em> will be performed in a case insensitve way.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>media</code></em> :</span></p></td>
<td>the media to find</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>encoding_name</code></em> :</span></p></td>
<td>the encoding name to find</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="type">GstRTPPayloadInfo</span></a> or NULL when no info could be found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-rtp-payload-info-for-pt"></a><h3>gst_rtp_payload_info_for_pt ()</h3>
<pre class="programlisting">const <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="returnvalue">GstRTPPayloadInfo</span></a> * gst_rtp_payload_info_for_pt   (<em class="parameter"><code><span class="type">guint8</span> payload_type</code></em>);</pre>
<p>
Get the <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="type">GstRTPPayloadInfo</span></a> for <em class="parameter"><code>payload_type</code></em>. This function is
mostly used to get the default clock-rate and bandwidth for static payload
types specified with <em class="parameter"><code>payload_type</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>payload_type</code></em> :</span></p></td>
<td>the payload_type to find</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstrtppayloads.html#GstRTPPayloadInfo" title="struct GstRTPPayloadInfo"><span class="type">GstRTPPayloadInfo</span></a> or NULL when no info could be found.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstrtppayloads.see-also"></a><h2>See Also</h2>
gstrtpbuffer
</div>
</div>
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