<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <title>Phonon.AbstractMediaStream</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <link rel="stylesheet" type="text/css" href="../common/doxygen.css" /> <link rel="stylesheet" media="screen" type="text/css" title="KDE Colors" href="../common/kde.css" /> </head> <body> <div id="container"> <div id="header"> <div id="header_top"> <div> <div> <img alt ="" src="../common/top-kde.jpg"/> KDE 4.4 PyKDE API Reference </div> </div> </div> <div id="header_bottom"> <div id="location"> <ul> <li>KDE's Python API</li> </ul> </div> <div id="menu"> <ul> <li><a href="../modules.html">Overview</a></li> <li><a href="http://techbase.kde.org/Development/Languages/Python">PyKDE Home</a></li> <li><a href="http://kde.org/family/">Sitemap</a></li> <li><a href="http://kde.org/contact/">Contact Us</a></li> </ul> </div> </div> </div> <div id="body_wrapper"> <div id="body"> <div id="right"> <div class="content"> <div id="main"> <div class="clearer"> </div> <h1>AbstractMediaStream Class Reference</h1> <code>from PyKDE4.phonon import *</code> <p> Inherits: <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qobject.html">QObject</a><br /> Namespace: Phonon.AbstractMediaStream<br /> <h2>Detailed Description</h2> <p>\class AbstractMediaStream abstractmediastream.h Phonon/AbstractMediaStream Base class for custom media data streams. </p> <p> Implement this class to provide a custom data stream to the backend. The class supports both, the push and the pull model. </p> <p> Push: <pre class="fragment"> PushStream.PushStream(QObject *parent) : AbstractMediaStream(parent), m_timer(new QTimer(this)) { setStreamSize(getMediaStreamSize()); connect(m_timer, SIGNAL(timeout()), SLOT(moreData())); m_timer->setInterval(0); } void PushStream.moreData() { const QByteArray data = getMediaData(); if (data.isEmpty()) { endOfData(); } else { writeData(data); } } void PushStream.needData() { m_timer->start(); moreData(); } void PushStream.enoughData() { m_timer->stop(); } </pre> </p> <p> Pull: <pre class="fragment"> PullStream.PullStream(QObject *parent) : AbstractMediaStream(parent) { setStreamSize(getMediaStreamSize()); } void PullStream.needData() { const QByteArray data = getMediaData(); if (data.isEmpty()) { endOfData(); } else { writeData(data); } } </pre> </p> <p> <dl class="author" compact><dt><b>Author:</b></dt><dd> Matthias Kretz <kretz@kde.org> </dd></dl> </p> <table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#AbstractMediaStream">__init__</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qobject.html">QObject</a> parent=0)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#endOfData">endOfData</a> (self)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#enoughData">enoughData</a> (self)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#error">error</a> (self, Phonon::ErrorType errorType, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> errorString)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#needData">needData</a> (self)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#reset">reset</a> (self)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#seekStream">seekStream</a> (self, long offset)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setStreamSeekable">setStreamSeekable</a> (self, bool a0)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setStreamSize">setStreamSize</a> (self, long a0)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#streamSeekable">streamSeekable</a> (self)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">long </td><td class="memItemRight" valign="bottom"><a class="el" href="#streamSize">streamSize</a> (self)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#writeData">writeData</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qbytearray.html">QByteArray</a> data)</td></tr> </table> <hr><h2>Method Documentation</h2><a class="anchor" name="AbstractMediaStream"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname">__init__</td> <td>(</td> <td class="paramtype"> <em>self</em>, </td> <td class="paramname"></td> </tr><tr> <td class="memname"></td> <td></td> <td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qobject.html">QObject</a> </td> <td class="paramname"><em>parent=0</em></td> </tr> <tr> <td></td> <td>)</td> <td></td> <td></td> <td width="100%"> </td> </tr></table> </div> <div class="memdoc"><p>Constructs an AbstractMediaStream object with a <b>parent.</b> </p></div></div><a class="anchor" name="endOfData"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> endOfData</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname"><em>self</em> )</td> <td width="100%"> </td> </tr> </table> </div> <div class="memdoc"><p>Tells the backend that the media data stream is at its end. </p> <p> <dl class="warning" compact><dt><b>Warning:</b></dt><dd> Don't call this function before the first needData() is emitted. </dd></dl> </p></div></div><a class="anchor" name="enoughData"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> enoughData</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname"><em>self</em> )</td> <td width="100%"> </td> </tr> </table> </div> <div class="memdoc"><p>Reimplement this function to be notified when the backend has enough data and your stream object may take a break. This method is important for pushing data to the backend in order to not fill the backend buffer unnecessarily. </p></div></div><a class="anchor" name="error"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> error</td> <td>(</td> <td class="paramtype"> <em>self</em>, </td> <td class="paramname"></td> </tr><tr> <td class="memname"></td> <td></td> <td class="paramtype">Phonon::ErrorType </td> <td class="paramname"><em>errorType</em>, </td> </tr> <tr> <td class="memname"></td> <td></td> <td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td> <td class="paramname"><em>errorString</em></td> </tr> <tr> <td></td> <td>)</td> <td></td> <td></td> <td width="100%"> </td> </tr></table> </div> <div class="memdoc"><p>If an I/O error occurs you should call this function to make MediaObject go into ErrorState. </p> <p> <dl class="see" compact><dt><b>See also:</b></dt><dd> MediaObject.errorType() </dd></dl> <dl class="see" compact><dt><b>See also:</b></dt><dd> MediaObject.errorString() </dd></dl> </p></div></div><a class="anchor" name="needData"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> needData</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname"><em>self</em> )</td> <td width="100%"> </td> </tr> </table> </div> <div class="memdoc"><dl compact><dt><b>Abstract method:</b></dt><dd>This method is abstract and can be overridden but not called directly.</dd></dl><p>Reimplement this function to be notified when the backend needs data. </p> <p> When this function is called you should try to call writeData or endOfData before returning. </p></div></div><a class="anchor" name="reset"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> reset</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname"><em>self</em> )</td> <td width="100%"> </td> </tr> </table> </div> <div class="memdoc"><dl compact><dt><b>Abstract method:</b></dt><dd>This method is abstract and can be overridden but not called directly.</dd></dl><p>Reimplement this function to reset the stream. Subsequent calls to writeData should start from the first position of the data unless a seek is requested. </p> <p> The function is necessary for the case where a non-seekable MediaStream is played more than once. For a seekable stream the implementation can simply call <pre class="fragment"> seekStream(0); \endcode. </p></div></div><a class="anchor" name="seekStream"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> seekStream</td> <td>(</td> <td class="paramtype"> <em>self</em>, </td> <td class="paramname"></td> </tr><tr> <td class="memname"></td> <td></td> <td class="paramtype">long </td> <td class="paramname"><em>offset</em></td> </tr> <tr> <td></td> <td>)</td> <td></td> <td></td> <td width="100%"> </td> </tr></table> </div> <div class="memdoc"><p>Reimplement this function if your stream is seekable. </p> <p> When this function is called the next call to writeData has to be at the requested \p offset. </p> <p> <dl class="warning" compact><dt><b>Warning:</b></dt><dd> Do not call the parent implementation. </dd></dl> </p></div></div><a class="anchor" name="setStreamSeekable"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> setStreamSeekable</td> <td>(</td> <td class="paramtype"> <em>self</em>, </td> <td class="paramname"></td> </tr><tr> <td class="memname"></td> <td></td> <td class="paramtype">bool </td> <td class="paramname"><em>a0</em></td> </tr> <tr> <td></td> <td>)</td> <td></td> <td></td> <td width="100%"> </td> </tr></table> </div> <div class="memdoc"><p>Sets whether your data stream is seekable. </p> <p> Defaults to false. </p> <p> If you set this to true you have to implement the seekStream function. </p></div></div><a class="anchor" name="setStreamSize"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> setStreamSize</td> <td>(</td> <td class="paramtype"> <em>self</em>, </td> <td class="paramname"></td> </tr><tr> <td class="memname"></td> <td></td> <td class="paramtype">long </td> <td class="paramname"><em>a0</em></td> </tr> <tr> <td></td> <td>)</td> <td></td> <td></td> <td width="100%"> </td> </tr></table> </div> <div class="memdoc"><p>Sets the size of the stream in number of bytes. </p> <p> A negative value means that the length of the stream cannot be known. </p> <p> Defaults to 0. </p> <p> This function has to be called. A backend will not call needData() until the stream size is set. </p></div></div><a class="anchor" name="streamSeekable"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname">bool streamSeekable</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname"><em>self</em> )</td> <td width="100%"> </td> </tr> </table> </div> <div class="memdoc"><p>Returns whether your data stream is set as seekable. </p> <p> Defaults to false. </p></div></div><a class="anchor" name="streamSize"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname">long streamSize</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname"><em>self</em> )</td> <td width="100%"> </td> </tr> </table> </div> <div class="memdoc"><p>Returns the stream size that was set with setStreamSize. </p> <p> A negative value means that the length of the stream cannot be known. </p> <p> Defaults to 0. </p></div></div><a class="anchor" name="writeData"></a> <div class="memitem"> <div class="memproto"> <table class="memname"><tr> <td class="memname"> writeData</td> <td>(</td> <td class="paramtype"> <em>self</em>, </td> <td class="paramname"></td> </tr><tr> <td class="memname"></td> <td></td> <td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qbytearray.html">QByteArray</a> </td> <td class="paramname"><em>data</em></td> </tr> <tr> <td></td> <td>)</td> <td></td> <td></td> <td width="100%"> </td> </tr></table> </div> <div class="memdoc"><p>Sends the media <b>data</b> to the backend for decoding. </p> <p> <dl class="warning" compact><dt><b>Warning:</b></dt><dd> Don't call this function before the first needData() is emitted. </dd></dl> </p></div></div> </div> </div> </div> <div id="left"> <div class="menu_box"> <div class="nav_list"> <ul> <li><a href="../allclasses.html">Full Index</a></li> </ul> </div> <a name="cp-menu" /><div class="menutitle"><div> <h2 id="cp-menu-project">Modules</h2> </div></div> <div class="nav_list"> <ul><li><a href="../akonadi/index.html">akonadi</a></li> <li><a href="../dnssd/index.html">dnssd</a></li> <li><a href="../kdecore/index.html">kdecore</a></li> <li><a href="../kdeui/index.html">kdeui</a></li> <li><a href="../khtml/index.html">khtml</a></li> <li><a href="../kio/index.html">kio</a></li> <li><a href="../knewstuff/index.html">knewstuff</a></li> <li><a href="../kparts/index.html">kparts</a></li> <li><a href="../kutils/index.html">kutils</a></li> <li><a href="../nepomuk/index.html">nepomuk</a></li> <li><a href="../phonon/index.html">phonon</a></li> <li><a href="../plasma/index.html">plasma</a></li> <li><a href="../polkitqt/index.html">polkitqt</a></li> <li><a href="../solid/index.html">solid</a></li> <li><a href="../soprano/index.html">soprano</a></li> </ul></div></div> </div> </div> <div class="clearer"/> </div> <div id="end_body"></div> </div> <div id="footer"><div id="footer_text"> This documentation is maintained by <a href="mailto:simon@simonzone.com">Simon Edwards</a>.<br /> KDE<sup>®</sup> and <a href="../images/kde_gear_black.png">the K Desktop Environment<sup>®</sup> logo</a> are registered trademarks of <a href="http://ev.kde.org/" title="Homepage of the KDE non-profit Organization">KDE e.V.</a> | <a href="http://www.kde.org/contact/impressum.php">Legal</a> </div></div> </body> </html>