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<h1 class="title">QAudioInput Class Reference</h1>
<!-- $$$QAudioInput-brief -->
<p>The QAudioInput class provides an interface for receiving audio data from an audio input device. <a href="#details">More...</a></p>
<!-- @@@QAudioInput -->
<pre class="cpp"> <span class="preprocessor">#include &lt;QAudioInput&gt;</span></pre><p><b>Inherits: </b><a href="qobject.html">QObject</a>.</p>
<p>This class was introduced in Qt 4.6.</p>
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<li><a href="qaudioinput-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#QAudioInput">QAudioInput</a></b> ( const QAudioFormat &amp; <i>format</i> = QAudioFormat(), QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#QAudioInput-2">QAudioInput</a></b> ( const QAudioDeviceInfo &amp; <i>audioDevice</i>, const QAudioFormat &amp; <i>format</i> = QAudioFormat(), QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#dtor.QAudioInput">~QAudioInput</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#bufferSize">bufferSize</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#bytesReady">bytesReady</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qint64 </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#elapsedUSecs">elapsedUSecs</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudio::Error </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#error">error</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudioFormat </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#format">format</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#notifyInterval">notifyInterval</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#periodSize">periodSize</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qint64 </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#processedUSecs">processedUSecs</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#reset">reset</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#resume">resume</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#setBufferSize">setBufferSize</a></b> ( int <i>value</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#setNotifyInterval">setNotifyInterval</a></b> ( int <i>ms</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#start">start</a></b> ( QIODevice * <i>device</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QIODevice * </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#start-2">start</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudio::State </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#state">state</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#stop">stop</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#suspend">suspend</a></b> ()</td></tr>
</table>
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<li class="fn">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 rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#notify">notify</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qaudioinput.html#stateChanged">stateChanged</a></b> ( QAudio::State <i>state</i> )</td></tr>
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<li class="fn">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 class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QAudioInput-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QAudioInput class provides an interface for receiving audio data from an audio input device.</p>
<p>You can construct an audio input with the system's <a href="qaudiodeviceinfo.html#defaultInputDevice">default audio input device</a>. It is also possible to create QAudioInput with a specific <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a>. When you create the audio input, you should also send in the <a href="qaudioformat.html">QAudioFormat</a> to be used for the recording (see the <a href="qaudioformat.html">QAudioFormat</a> class description for details).</p>
<p>To record to a file:</p>
<p>QAudioInput lets you record audio with an audio input device. The default constructor of this class will use the systems default audio device, but you can also specify a <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a> for a specific device. You also need to pass in the <a href="qaudioformat.html">QAudioFormat</a> in which you wish to record.</p>
<p>Starting up the QAudioInput is simply a matter of calling <a href="qaudioinput.html#start">start</a>() with a <a href="qiodevice.html">QIODevice</a> opened for writing. For instance, to record to a file, you can:</p>
<pre class="cpp"> <span class="type"><a href="qfile.html">QFile</a></span> outputFile; <span class="comment">// class member.</span>
<span class="type">QAudioInput</span> <span class="operator">*</span>audioInput; <span class="comment">// class member.</span>
...
<span class="type">void</span> startRecording()
{
outputFile<span class="operator">.</span>setFileName(<span class="string">&quot;/tmp/test.raw&quot;</span>);
outputFile<span class="operator">.</span>open( <span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>Truncate );
<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> format;
<span class="comment">// set up the format you want, eg.</span>
format<span class="operator">.</span>setFrequency(<span class="number">8000</span>);
format<span class="operator">.</span>setChannels(<span class="number">1</span>);
format<span class="operator">.</span>setSampleSize(<span class="number">8</span>);
format<span class="operator">.</span>setCodec(<span class="string">&quot;audio/pcm&quot;</span>);
format<span class="operator">.</span>setByteOrder(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>LittleEndian);
format<span class="operator">.</span>setSampleType(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>UnSignedInt);
<span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> info <span class="operator">=</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">::</span>defaultInputDevice();
<span class="keyword">if</span> (<span class="operator">!</span>info<span class="operator">.</span>isFormatSupported(format)) {
<a href="qtglobal.html#qWarning">qWarning</a>()<span class="operator">&lt;</span><span class="operator">&lt;</span><span class="string">&quot;default format not supported try to use nearest&quot;</span>;
format <span class="operator">=</span> info<span class="operator">.</span>nearestFormat(format);
}
audioInput <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QAudioInput</span>(format<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">3000</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(stopRecording()));
audioInput<span class="operator">-</span><span class="operator">&gt;</span>start(<span class="operator">&amp;</span>outputFile);
<span class="comment">// Records audio for 3000ms</span>
}</pre>
<p>This will start recording if the format specified is supported by the input device (you can check this with <a href="qaudiodeviceinfo.html#isFormatSupported">QAudioDeviceInfo::isFormatSupported</a>(). In case there are any snags, use the <a href="qaudioinput.html#error">error</a>() function to check what went wrong. We stop recording in the <tt>stopRecording()</tt> slot.</p>
<pre class="cpp"> <span class="type">void</span> stopRecording()
{
audioInput<span class="operator">-</span><span class="operator">&gt;</span>stop();
outputFile<span class="operator">.</span>close();
<span class="keyword">delete</span> audioInput;
}</pre>
<p>At any point in time, QAudioInput will be in one of four states: active, suspended, stopped, or idle. These states are specified by the <a href="qaudio.html#State-enum">QAudio::State</a> enum. You can request a state change directly through <a href="qaudioinput.html#suspend">suspend</a>(), <a href="qaudioinput.html#resume">resume</a>(), <a href="qaudioinput.html#stop">stop</a>(), <a href="qaudioinput.html#reset">reset</a>(), and <a href="qaudioinput.html#start">start</a>(). The current state is reported by <a href="qaudioinput.html#state">state</a>(). <a href="qaudiooutput.html">QAudioOutput</a> will also signal you when the state changes (<a href="qaudioinput.html#stateChanged">stateChanged</a>()).</p>
<p>QAudioInput provides several ways of measuring the time that has passed since the <a href="qaudioinput.html#start">start</a>() of the recording. The <tt>processedUSecs()</tt> function returns the length of the stream in microseconds written, i.e&#x2e;, it leaves out the times the audio input was suspended or idle. The <a href="qaudioinput.html#elapsedUSecs">elapsedUSecs</a>() function returns the time elapsed since <a href="qaudioinput.html#start">start</a>() was called regardless of which states the QAudioInput has been in.</p>
<p>If an error should occur, you can fetch its reason with <a href="qaudioinput.html#error">error</a>(). The possible error reasons are described by the <a href="qaudio.html#Error-enum">QAudio::Error</a> enum. The QAudioInput will enter the <a href="qaudio.html#State-enum">StoppedState</a> when an error is encountered. Connect to the <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal to handle the error:</p>
<pre class="cpp"> <span class="type">void</span> stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State newState)
{
<span class="keyword">switch</span>(newState) {
<span class="keyword">case</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>StoppedState:
<span class="keyword">if</span> (audioInput<span class="operator">-</span><span class="operator">&gt;</span>error() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>NoError) {
<span class="comment">// Perform error handling</span>
} <span class="keyword">else</span> {
}
<span class="keyword">break</span>;</pre>
<a name="symbian-platform-security-requirements"></a>
<h3>Symbian Platform Security Requirements</h3>
<p>On Symbian, processes which use this class must have the <tt>UserEnvironment</tt> platform security capability. If the client process lacks this capability, calls to either overload of <a href="qaudioinput.html#start">start</a>() will fail. This failure is indicated by the QAudioInput object setting its <a href="qaudioinput.html#error">error</a>() value to <a href="qaudio.html#Error-enum">QAudio::OpenError</a> and then emitting a <a href="qaudioinput.html#stateChanged">stateChanged</a>(<a href="qaudio.html#State-enum">QAudio::StoppedState</a>) signal.</p>
<p>Platform security capabilities are added via the <a href="qmake-variable-reference.html#target-capability">TARGET.CAPABILITY</a> qmake variable.</p>
</div>
<p><b>See also </b><a href="qaudiooutput.html">QAudioOutput</a> and <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a>.</p>
<!-- @@@QAudioInput -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QAudioInput[overload1]$$$QAudioInputconstQAudioFormat&QObject* -->
<h3 class="fn"><a name="QAudioInput"></a>QAudioInput::<span class="name">QAudioInput</span> ( const <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> &amp; <i>format</i> = QAudioFormat(), <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
<p>Construct a new audio input and attach it to <i>parent</i>. The default audio input device is used with the output <i>format</i> parameters.</p>
<!-- @@@QAudioInput -->
<!-- $$$QAudioInput$$$QAudioInputconstQAudioDeviceInfo&constQAudioFormat&QObject* -->
<h3 class="fn"><a name="QAudioInput-2"></a>QAudioInput::<span class="name">QAudioInput</span> ( const <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> &amp; <i>audioDevice</i>, const <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> &amp; <i>format</i> = QAudioFormat(), <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
<p>Construct a new audio input and attach it to <i>parent</i>. The device referenced by <i>audioDevice</i> is used with the input <i>format</i> parameters.</p>
<!-- @@@QAudioInput -->
<!-- $$$~QAudioInput[overload1]$$$~QAudioInput -->
<h3 class="fn"><a name="dtor.QAudioInput"></a>QAudioInput::<span class="name">~QAudioInput</span> ()</h3>
<p>Destroy this audio input.</p>
<!-- @@@~QAudioInput -->
<!-- $$$bufferSize[overload1]$$$bufferSize -->
<h3 class="fn"><a name="bufferSize"></a><span class="type">int</span> QAudioInput::<span class="name">bufferSize</span> () const</h3>
<p>Returns the audio buffer size in milliseconds.</p>
<p>If called before <a href="qaudioinput.html#start">start</a>(), returns platform default value. If called before <a href="qaudioinput.html#start">start</a>() but <a href="qaudioinput.html#setBufferSize">setBufferSize</a>() was called prior, returns value set by <a href="qaudioinput.html#setBufferSize">setBufferSize</a>(). If called after <a href="qaudioinput.html#start">start</a>(), returns the actual buffer size being used. This may not be what was set previously by <a href="qaudioinput.html#setBufferSize">setBufferSize</a>().</p>
<p><b>See also </b><a href="qaudioinput.html#setBufferSize">setBufferSize</a>().</p>
<!-- @@@bufferSize -->
<!-- $$$bytesReady[overload1]$$$bytesReady -->
<h3 class="fn"><a name="bytesReady"></a><span class="type">int</span> QAudioInput::<span class="name">bytesReady</span> () const</h3>
<p>Returns the amount of audio data available to read in bytes.</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>
<!-- @@@bytesReady -->
<!-- $$$elapsedUSecs[overload1]$$$elapsedUSecs -->
<h3 class="fn"><a name="elapsedUSecs"></a><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> QAudioInput::<span class="name">elapsedUSecs</span> () const</h3>
<p>Returns the microseconds since <a href="qaudioinput.html#start">start</a>() was called, including time in Idle and Suspend states.</p>
<!-- @@@elapsedUSecs -->
<!-- $$$error[overload1]$$$error -->
<h3 class="fn"><a name="error"></a><span class="type"><a href="qaudio.html#Error-enum">QAudio::Error</a></span> QAudioInput::<span class="name">error</span> () const</h3>
<p>Returns the error state.</p>
<!-- @@@error -->
<!-- $$$format[overload1]$$$format -->
<h3 class="fn"><a name="format"></a><span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> QAudioInput::<span class="name">format</span> () const</h3>
<p>Returns the <a href="qaudioformat.html">QAudioFormat</a> being used.</p>
<!-- @@@format -->
<!-- $$$notify[overload1]$$$notify -->
<h3 class="fn"><a name="notify"></a><span class="type">void</span> QAudioInput::<span class="name">notify</span> ()<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>
<!-- @@@notify -->
<!-- $$$notifyInterval[overload1]$$$notifyInterval -->
<h3 class="fn"><a name="notifyInterval"></a><span class="type">int</span> QAudioInput::<span class="name">notifyInterval</span> () const</h3>
<p>Returns the notify interval in milliseconds.</p>
<p><b>See also </b><a href="qaudioinput.html#setNotifyInterval">setNotifyInterval</a>().</p>
<!-- @@@notifyInterval -->
<!-- $$$periodSize[overload1]$$$periodSize -->
<h3 class="fn"><a name="periodSize"></a><span class="type">int</span> QAudioInput::<span class="name">periodSize</span> () const</h3>
<p>Returns the period size in bytes.</p>
<p>Note: This is the recommended read size in bytes.</p>
<!-- @@@periodSize -->
<!-- $$$processedUSecs[overload1]$$$processedUSecs -->
<h3 class="fn"><a name="processedUSecs"></a><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> QAudioInput::<span class="name">processedUSecs</span> () const</h3>
<p>Returns the amount of audio data processed since <a href="qaudioinput.html#start">start</a>() was called in microseconds.</p>
<!-- @@@processedUSecs -->
<!-- $$$reset[overload1]$$$reset -->
<h3 class="fn"><a name="reset"></a><span class="type">void</span> QAudioInput::<span class="name">reset</span> ()</h3>
<p>Drops all audio data in the buffers, resets buffers to zero.</p>
<!-- @@@reset -->
<!-- $$$resume[overload1]$$$resume -->
<h3 class="fn"><a name="resume"></a><span class="type">void</span> QAudioInput::<span class="name">resume</span> ()</h3>
<p>Resumes processing audio data after a <a href="qaudioinput.html#suspend">suspend</a>().</p>
<p>Sets <a href="qaudioinput.html#error">error</a>() to <a href="qaudio.html#Error-enum">QAudio::NoError</a>. Sets <a href="qaudioinput.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="qaudioinput.html#state">state</a>() to <a href="qaudio.html#State-enum">QAudio::IdleState</a> if you previously called <a href="qaudioinput.html#start">start</a>(). emits <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal.</p>
<!-- @@@resume -->
<!-- $$$setBufferSize[overload1]$$$setBufferSizeint -->
<h3 class="fn"><a name="setBufferSize"></a><span class="type">void</span> QAudioInput::<span class="name">setBufferSize</span> ( <span class="type">int</span> <i>value</i> )</h3>
<p>Sets the audio buffer size to <i>value</i> milliseconds.</p>
<p>Note: This function can be called anytime before <a href="qaudioinput.html#start">start</a>(), calls to this are ignored after <a href="qaudioinput.html#start">start</a>(). It should not be assumed that the buffer size set is the actual buffer size used, calling <a href="qaudioinput.html#bufferSize">bufferSize</a>() anytime after <a href="qaudioinput.html#start">start</a>() will return the actual buffer size being used.</p>
<p><b>See also </b><a href="qaudioinput.html#bufferSize">bufferSize</a>().</p>
<!-- @@@setBufferSize -->
<!-- $$$setNotifyInterval[overload1]$$$setNotifyIntervalint -->
<h3 class="fn"><a name="setNotifyInterval"></a><span class="type">void</span> QAudioInput::<span class="name">setNotifyInterval</span> ( <span class="type">int</span> <i>ms</i> )</h3>
<p>Sets the interval for <a href="qaudioinput.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="qaudioinput.html#notifyInterval">notifyInterval</a>() to confirm actual value being used.</p>
<p><b>See also </b><a href="qaudioinput.html#notifyInterval">notifyInterval</a>().</p>
<!-- @@@setNotifyInterval -->
<!-- $$$start[overload1]$$$startQIODevice* -->
<h3 class="fn"><a name="start"></a><span class="type">void</span> QAudioInput::<span class="name">start</span> ( <span class="type"><a href="qiodevice.html">QIODevice</a></span> * <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 transferred without any extra code. All that is required is to open the <a href="qiodevice.html">QIODevice</a>. <a href="qaudioinput.html">QAudioInput</a> does not take ownership of <i>device</i>.</p>
<p>The <a href="qaudioinput.html">QAudioInput</a> will write to the device when new data is available. You can subclass <a href="qiodevice.html">QIODevice</a> and reimplement <a href="qiodevice.html#writeData">writeData()</a> if you wish to access the data. If you simply want to save data to a file, you can pass a <a href="qfile.html">QFile</a> to this function.</p>
<p>If able to successfully get audio data from the systems audio device the <a href="qaudioinput.html#state">state</a>() is set to either <a href="qaudio.html#State-enum">QAudio::ActiveState</a> or <a href="qaudio.html#State-enum">QAudio::IdleState</a>, <a href="qaudioinput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::NoError</a> and the <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p>If a problem occurs during this process the <a href="qaudioinput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::OpenError</a>, <a href="qaudioinput.html#state">state</a>() is set to <a href="qaudio.html#State-enum">QAudio::StoppedState</a> and <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p><a href="qaudioinput.html#symbian-platform-security-requirements">QAudioInput#Symbian Platform Security Requirements</a></p>
<p><b>See also </b><a href="qiodevice.html">QIODevice</a>.</p>
<!-- @@@start -->
<!-- $$$start$$$start -->
<h3 class="fn"><a name="start-2"></a><span class="type"><a href="qiodevice.html">QIODevice</a></span> * QAudioInput::<span class="name">start</span> ()</h3>
<p>Returns a pointer to a new <a href="qiodevice.html">QIODevice</a> that will be used to handle the data transfer. This <a href="qiodevice.html">QIODevice</a> can be used to <a href="qiodevice.html#read">read()</a> audio data directly. You will typically connect to the <a href="qiodevice.html#readyRead">readyRead()</a> signal, and read from the device in the slot you connect to. <a href="qaudioinput.html">QAudioInput</a> keeps ownership of the device.</p>
<p>If able to access the systems audio device the <a href="qaudioinput.html#state">state</a>() is set to <a href="qaudio.html#State-enum">QAudio::IdleState</a>, <a href="qaudioinput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::NoError</a> and the <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p>If a problem occurs during this process the <a href="qaudioinput.html#error">error</a>() is set to <a href="qaudio.html#Error-enum">QAudio::OpenError</a>, <a href="qaudioinput.html#state">state</a>() is set to <a href="qaudio.html#State-enum">QAudio::StoppedState</a> and <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal is emitted.</p>
<p><a href="qaudioinput.html#symbian-platform-security-requirements">QAudioInput#Symbian Platform Security Requirements</a></p>
<p><b>See also </b><a href="qiodevice.html">QIODevice</a>.</p>
<!-- @@@start -->
<!-- $$$state[overload1]$$$state -->
<h3 class="fn"><a name="state"></a><span class="type"><a href="qaudio.html#State-enum">QAudio::State</a></span> QAudioInput::<span class="name">state</span> () const</h3>
<p>Returns the state of audio processing.</p>
<!-- @@@state -->
<!-- $$$stateChanged[overload1]$$$stateChangedQAudio::State -->
<h3 class="fn"><a name="stateChanged"></a><span class="type">void</span> QAudioInput::<span class="name">stateChanged</span> ( <span class="type"><a href="qaudio.html#State-enum">QAudio::State</a></span> <i>state</i> )<tt> [signal]</tt></h3>
<p>This signal is emitted when the device <i>state</i> has changed.</p>
<!-- @@@stateChanged -->
<!-- $$$stop[overload1]$$$stop -->
<h3 class="fn"><a name="stop"></a><span class="type">void</span> QAudioInput::<span class="name">stop</span> ()</h3>
<p>Stops the audio input, detaching from the system resource.</p>
<p>Sets <a href="qaudioinput.html#error">error</a>() to <a href="qaudio.html#Error-enum">QAudio::NoError</a>, <a href="qaudioinput.html#state">state</a>() to <a href="qaudio.html#State-enum">QAudio::StoppedState</a> and emit <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal.</p>
<!-- @@@stop -->
<!-- $$$suspend[overload1]$$$suspend -->
<h3 class="fn"><a name="suspend"></a><span class="type">void</span> QAudioInput::<span class="name">suspend</span> ()</h3>
<p>Stops processing audio data, preserving buffered audio data.</p>
<p>Sets <a href="qaudioinput.html#error">error</a>() to <a href="qaudio.html#Error-enum">QAudio::NoError</a>, <a href="qaudioinput.html#state">state</a>() to <a href="qaudio.html#State-enum">QAudio::SuspendedState</a> and emit <a href="qaudioinput.html#stateChanged">stateChanged</a>() signal.</p>
<!-- @@@suspend -->
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