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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">QAudioOutput Class Reference<br /><span class="small-subtitle">[<a href="qtmultimedia.html">QtMultimedia</a> module]</span>
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<p>The QAudioOutput class provides an interface for sending audio data to an audio output device. <a href="#details">More...</a></p>
<pre> #include <QAudioOutput></pre><p><b>This class is not part of the Qt GUI Framework Edition.</b></p>
<p>Inherits <a href="qobject.html">QObject</a>.</p>
<p>This class was introduced in Qt 4.6.</p>
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<li><a href="qaudiooutput-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#QAudioOutput">QAudioOutput</a></b> ( const QAudioFormat & <i>format</i> = QAudioFormat(), QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#QAudioOutput-2">QAudioOutput</a></b> ( const QAudioDeviceInfo & <i>audioDevice</i>, const QAudioFormat & <i>format</i> = QAudioFormat(), QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#dtor.QAudioOutput">~QAudioOutput</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#bufferSize">bufferSize</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#bytesFree">bytesFree</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">qint64 </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#elapsedUSecs">elapsedUSecs</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QAudio::Error </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#error">error</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QAudioFormat </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#format">format</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#notifyInterval">notifyInterval</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#periodSize">periodSize</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">qint64 </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#processedUSecs">processedUSecs</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#reset">reset</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#resume">resume</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#setBufferSize">setBufferSize</a></b> ( int <i>value</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#setNotifyInterval">setNotifyInterval</a></b> ( int <i>ms</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#start">start</a></b> ( QIODevice * <i>device</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QIODevice * </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#start-2">start</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QAudio::State </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#state">state</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#stop">stop</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#suspend">suspend</a></b> ()</td></tr>
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<li><div bar="2" class="fn"></div>29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
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<a name="signals"></a>
<h2>Signals</h2>
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<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#notify">notify</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qaudiooutput.html#stateChanged">stateChanged</a></b> ( QAudio::State <i>state</i> )</td></tr>
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<li><div bar="2" class="fn"></div>1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
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<h3>Additional Inherited Members</h3>
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<li><div class="fn"></div>1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li><div class="fn"></div>1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li><div class="fn"></div>5 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li><div class="fn"></div>7 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
</ul>
<a name="details"></a>
<hr />
<h2>Detailed Description</h2>
<p>The QAudioOutput class provides an interface for sending audio data to an audio output device.</p>
<p>You can construct an audio output with the system's <a href="qaudiodeviceinfo.html#defaultOutputDevice">default audio output device</a>. It is also possible to create QAudioOutput with a specific <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a>. When you create the audio output, you should also send in the <a href="qaudioformat.html">QAudioFormat</a> to be used for the playback (see the <a href="qaudioformat.html">QAudioFormat</a> class description for details).</p>
<p>To play a file:</p>
<p>Starting to play an audio stream is simply a matter of calling <a href="qaudiooutput.html#start">start</a>() with a <a href="qiodevice.html">QIODevice</a>. QAudioOutput will then fetch the data it needs from the io device. So playing back an audio file is as simple as:</p>
<pre> QFile inputFile; <span class="comment">// class member.</span>
QAudioOutput* audio; <span class="comment">// class member.</span></pre>
<pre> inputFile.setFileName("/tmp/test.raw");
inputFile.open(QIODevice::ReadOnly);
QAudioFormat format;
<span class="comment"> // Set up the format, eg.</span>
format.setFrequency(8000);
format.setChannels(1);
format.setSampleSize(8);
format.setCodec("audio/pcm");
format.setByteOrder(QAudioFormat::LittleEndian);
format.setSampleType(QAudioFormat::UnSignedInt);
QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
if (!info.isFormatSupported(format)) {
qWarning()<<"raw audio format not supported by backend, cannot play audio.";
return;
}
audio = new QAudioOutput(format, this);
connect(audio,SIGNAL(stateChanged(QAudio::State)),SLOT(finishedPlaying(QAudio::State)));
audio->start(&inputFile);</pre>
<p>The file will start playing assuming that the audio system and output device support it. If you run out of luck, check what's up with the <a href="qaudiooutput.html#error">error</a>() function.</p>
<p>After the file has finished playing, we need to stop the device:</p>
<pre> void finishedPlaying(QAudio::State state)
{
if(state == QAudio::IdleState) {
audio->stop();
inputFile.close();
delete audio;
}
}</pre>
<p>At any given time, the QAudioOutput will be in one of four states: active, suspended, stopped, or idle. These states are described by the <a href="qaudio.html#State-enum">QAudio::State</a> enum. State changes are reported through the <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal. You can use this signal to, for instance, update the GUI of the application; the mundane example here being changing the state of a <tt>play/pause</tt> button. You request a state change directly with <a href="qaudiooutput.html#suspend">suspend</a>(), <a href="qaudiooutput.html#stop">stop</a>(), <a href="qaudiooutput.html#reset">reset</a>(), <a href="qaudiooutput.html#resume">resume</a>(), and <a href="qaudiooutput.html#start">start</a>().</p>
<p>While the stream is playing, you can set a notify interval in milliseconds with <a href="qaudiooutput.html#setNotifyInterval">setNotifyInterval</a>(). This interval specifies the time between two emissions of the <a href="qaudiooutput.html#notify">notify</a>() signal. This is relative to the position in the stream, i.e., if the QAudioOutput is in the SuspendedState or the IdleState, the <a href="qaudiooutput.html#notify">notify</a>() signal is not emitted. A typical use-case would be to update a <a href="qslider.html">slider</a> that allows seeking in the stream. If you want the time since playback started regardless of which states the audio output has been in, <a href="qaudiooutput.html#elapsedUSecs">elapsedUSecs</a>() is the function for you.</p>
<p>If an error occurs, you can fetch the <a href="qaudio.html#Error-enum">error type</a> with the <a href="qaudiooutput.html#error">error</a>() function. Please see the <a href="qaudio.html#Error-enum">QAudio::Error</a> enum for a description of the possible errors that are reported. When an error is encountered, the state changes to <a href="qaudio.html#State-enum">QAudio::StoppedState</a>. You can check for errors by connecting to the <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal:</p>
<pre> void stateChanged(QAudio::State newState)
{
switch (newState) {
case QAudio::StopState:
if (output->error() != QAudio::NoError) {
<span class="comment">// Perform error handling</span>
} else {
<span class="comment">// Normal stop</span>
}
break;</pre>
<p>See also <a href="qaudioinput.html">QAudioInput</a> and <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a>.</p>
<hr />
<h2>Member Function Documentation</h2>
<a name="//apple_ref/cpp/instm/QAudioOutput/QAudioOutput"></a>
<h3 class="fn"><a name="QAudioOutput"></a>QAudioOutput::QAudioOutput ( const <a href="qaudioformat.html">QAudioFormat</a> & <i>format</i> = QAudioFormat(), <a href="qobject.html">QObject</a> * <i>parent</i> = 0 )</h3>
<p>Construct a new audio output and attach it to <i>parent</i>. The default audio output device is used with the output <i>format</i> parameters.</p>
<h3 class="fn"><a name="QAudioOutput-2"></a>QAudioOutput::QAudioOutput ( const <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a> & <i>audioDevice</i>, const <a href="qaudioformat.html">QAudioFormat</a> & <i>format</i> = QAudioFormat(), <a href="qobject.html">QObject</a> * <i>parent</i> = 0 )</h3>
<p>Construct a new audio output and attach it to <i>parent</i>. The device referenced by <i>audioDevice</i> is used with the output <i>format</i> parameters.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/~QAudioOutput"></a>
<h3 class="fn"><a name="dtor.QAudioOutput"></a>QAudioOutput::~QAudioOutput ()</h3>
<p>Destroys this audio output.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/bufferSize"></a>
<h3 class="fn"><a name="bufferSize"></a>int QAudioOutput::bufferSize () const</h3>
<p>Returns the audio buffer size in bytes.</p>
<p>If called before <a href="qaudiooutput.html#start">start</a>(), returns platform default value. If called before <a href="qaudiooutput.html#start">start</a>() but <a href="qaudiooutput.html#setBufferSize">setBufferSize</a>() was called prior, returns value set by <a href="qaudiooutput.html#setBufferSize">setBufferSize</a>(). If called after <a href="qaudiooutput.html#start">start</a>(), returns the actual buffer size being used. This may not be what was set previously by <a href="qaudiooutput.html#setBufferSize">setBufferSize</a>().</p>
<p>See also <a href="qaudiooutput.html#setBufferSize">setBufferSize</a>().</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/bytesFree"></a>
<h3 class="fn"><a name="bytesFree"></a>int QAudioOutput::bytesFree () const</h3>
<p>Returns the free space available in bytes in the audio buffer.</p>
<p>NOTE: returned value is only valid while in <a href="qaudio.html#State-enum">QAudio::ActiveState</a> or <a href="qaudio.html#State-enum">QAudio::IdleState</a> state, otherwise returns zero.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/elapsedUSecs"></a>
<h3 class="fn"><a name="elapsedUSecs"></a><a href="qtglobal.html#qint64-typedef">qint64</a> QAudioOutput::elapsedUSecs () const</h3>
<p>Returns the microseconds since <a href="qaudiooutput.html#start">start</a>() was called, including time in Idle and Suspend states.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/error"></a>
<h3 class="fn"><a name="error"></a><a href="qaudio.html#Error-enum">QAudio::Error</a> QAudioOutput::error () const</h3>
<p>Returns the error state.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/format"></a>
<h3 class="fn"><a name="format"></a><a href="qaudioformat.html">QAudioFormat</a> QAudioOutput::format () const</h3>
<p>Returns the <a href="qaudioformat.html">QAudioFormat</a> being used.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/notify"></a>
<h3 class="fn"><a name="notify"></a>void QAudioOutput::notify () <tt> [signal]</tt></h3>
<p>This signal is emitted when x ms of audio data has been processed the interval set by setNotifyInterval(x).</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/notifyInterval"></a>
<h3 class="fn"><a name="notifyInterval"></a>int QAudioOutput::notifyInterval () const</h3>
<p>Returns the notify interval in milliseconds.</p>
<p>See also <a href="qaudiooutput.html#setNotifyInterval">setNotifyInterval</a>().</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/periodSize"></a>
<h3 class="fn"><a name="periodSize"></a>int QAudioOutput::periodSize () const</h3>
<p>Returns the period size in bytes.</p>
<p>Note: This is the recommended write size in bytes.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/processedUSecs"></a>
<h3 class="fn"><a name="processedUSecs"></a><a href="qtglobal.html#qint64-typedef">qint64</a> QAudioOutput::processedUSecs () const</h3>
<p>Returns the amount of audio data processed by the class since <a href="qaudiooutput.html#start">start</a>() was called in microseconds.</p>
<p>Note: The amount of audio data played can be determined by subtracting the microseconds of audio data still in the systems audio buffer.</p>
<pre> qint64 bytesInBuffer = bufferSize() - bytesFree();
qint64 usInBuffer = (qint64)(1000000) * bytesInBuffer / ( channels() * sampleSize() / 8 ) / frequency();
qint64 usPlayed = processedUSecs() - usInBuffer;</pre>
<a name="//apple_ref/cpp/instm/QAudioOutput/reset"></a>
<h3 class="fn"><a name="reset"></a>void QAudioOutput::reset ()</h3>
<p>Drops all audio data in the buffers, resets buffers to zero.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/resume"></a>
<h3 class="fn"><a name="resume"></a>void QAudioOutput::resume ()</h3>
<p>Resumes processing audio data after a <a href="qaudiooutput.html#suspend">suspend</a>().</p>
<p>Sets <a href="qaudiooutput.html#error">error</a>() to <a href="qaudio.html#Error-enum">QAudio::NoError</a>. Sets <a href="qaudiooutput.html#state">state</a>() to <a href="qaudio.html#State-enum">QAudio::ActiveState</a> if you previously called start(<a href="qiodevice.html">QIODevice</a>*). Sets <a href="qaudiooutput.html#state">state</a>() to <a href="qaudio.html#State-enum">QAudio::IdleState</a> if you previously called <a href="qaudiooutput.html#start">start</a>(). emits <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal.</p>
<p>Note: signal will always be emitted during execution of the resume() function.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/setBufferSize"></a>
<h3 class="fn"><a name="setBufferSize"></a>void QAudioOutput::setBufferSize ( int <i>value</i> )</h3>
<p>Sets the audio buffer size to <i>value</i> in bytes.</p>
<p>Note: This function can be called anytime before <a href="qaudiooutput.html#start">start</a>(), calls to this are ignored after <a href="qaudiooutput.html#start">start</a>(). It should not be assumed that the buffer size set is the actual buffer size used, calling <a href="qaudiooutput.html#bufferSize">bufferSize</a>() anytime after <a href="qaudiooutput.html#start">start</a>() will return the actual buffer size being used.</p>
<p>See also <a href="qaudiooutput.html#bufferSize">bufferSize</a>().</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/setNotifyInterval"></a>
<h3 class="fn"><a name="setNotifyInterval"></a>void QAudioOutput::setNotifyInterval ( int <i>ms</i> )</h3>
<p>Sets the interval for <a href="qaudiooutput.html#notify">notify</a>() signal to be emitted. This is based on the <i>ms</i> of audio data processed not on actual real-time. The minimum resolution of the timer is platform specific and values should be checked with <a href="qaudiooutput.html#notifyInterval">notifyInterval</a>() to confirm actual value being used.</p>
<p>See also <a href="qaudiooutput.html#notifyInterval">notifyInterval</a>().</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/start"></a>
<h3 class="fn"><a name="start"></a>void QAudioOutput::start ( <a href="qiodevice.html">QIODevice</a> * <i>device</i> )</h3>
<p>Uses the <i>device</i> as the <a href="qiodevice.html">QIODevice</a> to transfer data. Passing a <a href="qiodevice.html">QIODevice</a> allows the data to be transfered without any extra code. All that is required is to open the <a href="qiodevice.html">QIODevice</a>.</p>
<p>If able to successfully output audio data to the systems audio device the <a href="qaudiooutput.html#state">state</a>() is set to <a href="qaudio.html#State-enum">QAudio::ActiveState</a>, <a href="qaudiooutput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::NoError</a> and the <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p>If a problem occurs during this process the <a href="qaudiooutput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::OpenError</a>, <a href="qaudiooutput.html#state">state</a>() is set to <a href="qaudio.html#State-enum">QAudio::StoppedState</a> and <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p>In either case, the <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal may be emitted either synchronously during execution of the start() function or asynchronously after start() has returned to the caller.</p>
<p>See also <a href="qiodevice.html">QIODevice</a>.</p>
<h3 class="fn"><a name="start-2"></a><a href="qiodevice.html">QIODevice</a> * QAudioOutput::start ()</h3>
<p>Returns a pointer to the <a href="qiodevice.html">QIODevice</a> being used to handle the data transfer. This <a href="qiodevice.html">QIODevice</a> can be used to write() audio data directly.</p>
<p>If able to access the systems audio device the <a href="qaudiooutput.html#state">state</a>() is set to <a href="qaudio.html#State-enum">QAudio::IdleState</a>, <a href="qaudiooutput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::NoError</a> and the <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p>If a problem occurs during this process the <a href="qaudiooutput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::OpenError</a>, <a href="qaudiooutput.html#state">state</a>() is set to <a href="qaudio.html#State-enum">QAudio::StoppedState</a> and <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p>In either case, the <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal may be emitted either synchronously during execution of the <a href="qaudiooutput.html#start">start</a>() function or asynchronously after <a href="qaudiooutput.html#start">start</a>() has returned to the caller.</p>
<p>See also <a href="qiodevice.html">QIODevice</a>.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/state"></a>
<h3 class="fn"><a name="state"></a><a href="qaudio.html#State-enum">QAudio::State</a> QAudioOutput::state () const</h3>
<p>Returns the state of audio processing.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/stateChanged"></a>
<h3 class="fn"><a name="stateChanged"></a>void QAudioOutput::stateChanged ( <a href="qaudio.html#State-enum">QAudio::State</a> <i>state</i> ) <tt> [signal]</tt></h3>
<p>This signal is emitted when the device <i>state</i> has changed. This is the current state of the audio output.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/stop"></a>
<h3 class="fn"><a name="stop"></a>void QAudioOutput::stop ()</h3>
<p>Stops the audio output, detaching from the system resource.</p>
<p>Sets <a href="qaudiooutput.html#error">error</a>() to <a href="qaudio.html#Error-enum">QAudio::NoError</a>, <a href="qaudiooutput.html#state">state</a>() to <a href="qaudio.html#State-enum">QAudio::StoppedState</a> and emit <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal.</p>
<a name="//apple_ref/cpp/instm/QAudioOutput/suspend"></a>
<h3 class="fn"><a name="suspend"></a>void QAudioOutput::suspend ()</h3>
<p>Stops processing audio data, preserving buffered audio data.</p>
<p>Sets <a href="qaudiooutput.html#error">error</a>() to <a href="qaudio.html#Error-enum">QAudio::NoError</a>, <a href="qaudiooutput.html#state">state</a>() to <a href="qaudio.html#State-enum">QAudio::SuspendedState</a> and emit <a href="qaudiooutput.html#stateChanged">stateChanged</a>() signal.</p>
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