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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

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diff --git a/src/multimedia/audio/qaudiooutput.cpp b/src/multimedia/audio/qaudiooutput.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QtMultimedia/qaudio.h>
+#include <QtMultimedia/qaudiodeviceinfo.h>
+#include <QtMultimedia/qaudioengine.h>
+#include <QtMultimedia/qaudiooutput.h>
+
+#include "qaudiodevicefactory_p.h"
+
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QAudioOutput
+    \brief The QAudioOutput class provides an interface for sending audio data to an audio output device.
+
+    \inmodule QtMultimedia
+    \ingroup  multimedia
+    \since 4.6
+
+    You can construct an audio output with the system's
+    \l{QAudioDeviceInfo::defaultOutputDevice()}{default audio output
+    device}. It is also possible to create QAudioOutput with a
+    specific QAudioDeviceInfo. When you create the audio output, you
+    should also send in the QAudioFormat to be used for the playback
+    (see the QAudioFormat class description for details).
+
+    To play a file:
+
+    Starting to play an audio stream is simply a matter of calling
+    start() with a QIODevice. QAudioOutput will then fetch the data it
+    needs from the io device. So playing back an audio file is as
+    simple as:
+
+    \code
+      QFile inputFile;     // class member.
+      QAudioOutput* audio; // class member.
+    \endcode
+
+    \code
+      inputFile.setFileName("/tmp/test.raw");
+      inputFile.open(QIODevice::ReadOnly);
+
+      QAudioFormat format;
+      // Set up the format, eg.
+      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);
+
+    \endcode
+
+    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 error() function.
+
+    After the file has finished playing, we need to stop the device:
+
+    \code
+      void finishedPlaying(QAudio::State state)
+      {
+        if(state == QAudio::IdleState) {
+          audio->stop();
+          inputFile.close();
+          delete audio;
+        }
+      }
+    \endcode
+
+    At any given time, the QAudioOutput will be in one of four states:
+    active, suspended, stopped, or idle. These states are described
+    by the QAudio::State enum.
+    State changes are reported through the stateChanged() 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 \c { play/pause } button. You request a state change directly
+    with suspend(), stop(), reset(), resume(), and start().
+
+    While the stream is playing, you can set a notify interval in
+    milliseconds with setNotifyInterval(). This interval specifies the
+    time between two emissions of the notify() signal. This is
+    relative to the position in the stream, i.e., if the QAudioOutput
+    is in the SuspendedState or the IdleState, the notify() signal is
+    not emitted. A typical use-case would be to update a
+    \l{QSlider}{slider} that allows seeking in the stream.
+    If you want the time since playback started regardless of which
+    states the audio output has been in, elapsedUSecs() is the function for you.
+
+    If an error occurs, you can fetch the \l{QAudio::Error}{error
+    type} with the error() function. Please see the QAudio::Error enum
+    for a description of the possible errors that are reported.  When
+    an error is encountered, the state changes to QAudio::StoppedState.
+    You can check for errors by connecting to the stateChanged()
+    signal:
+
+    \snippet doc/src/snippets/audio/main.cpp 3
+
+    \sa QAudioInput, QAudioDeviceInfo
+*/
+
+/*!
+    Construct a new audio output and attach it to \a parent.
+    The default audio output device is used with the output
+    \a format parameters.
+*/
+
+QAudioOutput::QAudioOutput(const QAudioFormat &format, QObject *parent):
+    QObject(parent)
+{
+    d = QAudioDeviceFactory::createDefaultOutputDevice(format);
+    connect(d, SIGNAL(notify()), SIGNAL(notify()));
+    connect(d, SIGNAL(stateChanged(QAudio::State)), SIGNAL(stateChanged(QAudio::State)));
+}
+
+/*!
+    Construct a new audio output and attach it to \a parent.
+    The device referenced by \a audioDevice is used with the output
+    \a format parameters.
+*/
+
+QAudioOutput::QAudioOutput(const QAudioDeviceInfo &audioDevice, const QAudioFormat &format, QObject *parent):
+    QObject(parent)
+{
+    d = QAudioDeviceFactory::createOutputDevice(audioDevice, format);
+    connect(d, SIGNAL(notify()), SIGNAL(notify()));
+    connect(d, SIGNAL(stateChanged(QAudio::State)), SIGNAL(stateChanged(QAudio::State)));
+}
+
+/*!
+    Destroys this audio output.
+*/
+
+QAudioOutput::~QAudioOutput()
+{
+    delete d;
+}
+
+/*!
+    Returns the QAudioFormat being used.
+
+*/
+
+QAudioFormat QAudioOutput::format() const
+{
+    return d->format();
+}
+
+/*!
+    Uses the \a device as the QIODevice to transfer data.
+    Passing a QIODevice allows the data to be transferred without any extra code.
+    All that is required is to open the QIODevice.
+
+    If able to successfully output audio data to the systems audio device the
+    state() is set to QAudio::ActiveState, error() is set to QAudio::NoError
+    and the stateChanged() signal is emitted.
+
+    If a problem occurs during this process the error() is set to QAudio::OpenError,
+    state() is set to QAudio::StoppedState and stateChanged() signal is emitted.
+
+    In either case, the stateChanged() signal may be emitted either synchronously
+    during execution of the start() function or asynchronously after start() has
+    returned to the caller.
+
+    \sa QIODevice
+*/
+
+void QAudioOutput::start(QIODevice* device)
+{
+    d->start(device);
+}
+
+/*!
+    Returns a pointer to the QIODevice being used to handle the data
+    transfer. This QIODevice can be used to write() audio data directly.
+
+    If able to access the systems audio device the state() is set to
+    QAudio::IdleState, error() is set to QAudio::NoError
+    and the stateChanged() signal is emitted.
+
+    If a problem occurs during this process the error() is set to QAudio::OpenError,
+    state() is set to QAudio::StoppedState and stateChanged() signal is emitted.
+
+    In either case, the stateChanged() signal may be emitted either synchronously
+    during execution of the start() function or asynchronously after start() has
+    returned to the caller.
+
+    \sa QIODevice
+*/
+
+QIODevice* QAudioOutput::start()
+{
+    return d->start(0);
+}
+
+/*!
+    Stops the audio output, detaching from the system resource.
+
+    Sets error() to QAudio::NoError, state() to QAudio::StoppedState and
+    emit stateChanged() signal.
+*/
+
+void QAudioOutput::stop()
+{
+    d->stop();
+}
+
+/*!
+    Drops all audio data in the buffers, resets buffers to zero.
+*/
+
+void QAudioOutput::reset()
+{
+    d->reset();
+}
+
+/*!
+    Stops processing audio data, preserving buffered audio data.
+
+    Sets error() to QAudio::NoError, state() to QAudio::SuspendedState and
+    emit stateChanged() signal.
+*/
+
+void QAudioOutput::suspend()
+{
+    d->suspend();
+}
+
+/*!
+    Resumes processing audio data after a suspend().
+
+    Sets error() to QAudio::NoError.
+    Sets state() to QAudio::ActiveState if you previously called start(QIODevice*).
+    Sets state() to QAudio::IdleState if you previously called start().
+    emits stateChanged() signal.
+
+    Note: signal will always be emitted during execution of the resume() function.
+*/
+
+void QAudioOutput::resume()
+{
+     d->resume();
+}
+
+/*!
+    Returns the free space available in bytes in the audio buffer.
+
+    NOTE: returned value is only valid while in QAudio::ActiveState or QAudio::IdleState
+    state, otherwise returns zero.
+*/
+
+int QAudioOutput::bytesFree() const
+{
+    return d->bytesFree();
+}
+
+/*!
+    Returns the period size in bytes.
+
+    Note: This is the recommended write size in bytes.
+*/
+
+int QAudioOutput::periodSize() const
+{
+    return d->periodSize();
+}
+
+/*!
+    Sets the audio buffer size to \a value in bytes.
+
+    Note: This function can be called anytime before start(), calls to this
+    are ignored after start(). It should not be assumed that the buffer size
+    set is the actual buffer size used, calling bufferSize() anytime after start()
+    will return the actual buffer size being used.
+*/
+
+void QAudioOutput::setBufferSize(int value)
+{
+    d->setBufferSize(value);
+}
+
+/*!
+    Returns the audio buffer size in bytes.
+
+    If called before start(), returns platform default value.
+    If called before start() but setBufferSize() was called prior, returns value set by setBufferSize().
+    If called after start(), returns the actual buffer size being used. This may not be what was set previously
+    by setBufferSize().
+
+*/
+
+int QAudioOutput::bufferSize() const
+{
+    return d->bufferSize();
+}
+
+/*!
+    Sets the interval for notify() signal to be emitted.
+    This is based on the \a ms of audio data processed
+    not on actual real-time.
+    The minimum resolution of the timer is platform specific and values
+    should be checked with notifyInterval() to confirm actual value
+    being used.
+*/
+
+void QAudioOutput::setNotifyInterval(int ms)
+{
+    d->setNotifyInterval(ms);
+}
+
+/*!
+    Returns the notify interval in milliseconds.
+*/
+
+int QAudioOutput::notifyInterval() const
+{
+    return d->notifyInterval();
+}
+
+/*!
+    Returns the amount of audio data processed by the class since start()
+    was called in microseconds.
+
+    Note: The amount of audio data played can be determined by subtracting
+    the microseconds of audio data still in the systems audio buffer.
+
+    \code
+    qint64 bytesInBuffer = bufferSize() - bytesFree();
+    qint64 usInBuffer = (qint64)(1000000) * bytesInBuffer / ( channels() * sampleSize() / 8 ) / frequency();
+    qint64 usPlayed = processedUSecs() - usInBuffer;
+    \endcode
+*/
+
+qint64 QAudioOutput::processedUSecs() const
+{
+    return d->processedUSecs();
+}
+
+/*!
+    Returns the microseconds since start() was called, including time in Idle and
+    Suspend states.
+*/
+
+qint64 QAudioOutput::elapsedUSecs() const
+{
+    return d->elapsedUSecs();
+}
+
+/*!
+    Returns the error state.
+*/
+
+QAudio::Error QAudioOutput::error() const
+{
+    return d->error();
+}
+
+/*!
+    Returns the state of audio processing.
+*/
+
+QAudio::State QAudioOutput::state() const
+{
+    return d->state();
+}
+
+/*!
+    \fn QAudioOutput::stateChanged(QAudio::State state)
+    This signal is emitted when the device \a state has changed.
+    This is the current state of the audio output.
+*/
+
+/*!
+    \fn QAudioOutput::notify()
+    This signal is emitted when x ms of audio data has been processed
+    the interval set by setNotifyInterval(x).
+*/
+
+QT_END_NAMESPACE