Merge AudioServices into mainline.

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diff --git a/src/multimedia/audio/qaudiodeviceinfo.cpp b/src/multimedia/audio/qaudiodeviceinfo.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qaudiodevicefactory_p.h"
+#include <QtMultimedia/qaudioengine.h>
+#include <QtMultimedia/qaudiodeviceinfo.h>
+
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QAudioDeviceInfo
+    \brief The QAudioDeviceInfo class provides an interface to query audio devices and their functionality.
+
+    \inmodule QtMultimedia
+    \ingroup multimedia
+    \since 4.6
+
+    QAudioDeviceInfo lets you query for audio devices--such as sound
+    cards and USB headsets--that are currently available on the system.
+    The audio devices available are dependent on the platform or audio plugins installed.
+
+    You can also query each device for the formats it supports. A
+    format in this context is a set consisting of a specific byte
+    order, channel, codec, frequency, sample rate, and sample type.  A
+    format is represented by the QAudioFormat class.
+
+    The values supported by the the device for each of these
+    parameters can be fetched with
+    supportedByteOrders(), supportedChannels(), supportedCodecs(),
+    supportedFrequencies(), supportedSampleSizes(), and
+    supportedSampleTypes(). The combinations supported are dependent on the platform,
+    audio plugins installed and the audio device capabilities. If you need a specific format, you can check if
+    the device supports it with isFormatSupported(), or fetch a
+    supported format that is as close as possible to the format with
+    nearestFormat().
+
+    A QAudioDeviceInfo is constructed with a QAudioDeviceId, which is
+    an identifier for a physical device. It is used by Qt to construct
+    classes that communicate with the device--such as
+    QAudioDeviceInfo, QAudioInput, and QAudioOutput. The static
+    functions defaultInputDevice(), defaultOutputDevice(), and
+    deviceList() let you get a hold of the ids for all available
+    devices. You fetch ids based on whether you will use the device
+    for input or output; this is specified by the QAudio::Mode enum.
+    The QAudioDeviceId returned are only valid for the QAudio::Mode.
+
+    For instance:
+
+    \code
+    foreach(QAudioDeviceId audioId, QAudioDeviceInfo::deviceList(QAudio::AudioOutput)) {
+        QAudioDeviceInfo info(audioId);
+        qDebug() << "Device name: " << info.deviceName();
+    }
+    \endcode
+
+    In this code sample, we loop through all devices that are able to output
+    sound, i.e., play an audio stream in a supported format. For each device we
+    find, we simply print the deviceName().
+
+    \sa QAudioOutput, QAudioInput, QAudioDeviceId
+*/
+
+/*!
+    Construct a new audio device info and attach it to \a parent.
+    Using the audio device with the specified \a id.
+*/
+
+QAudioDeviceInfo::QAudioDeviceInfo(const QAudioDeviceId &id, QObject *parent):
+    QObject(parent)
+{
+    d = QAudioDeviceFactory::audioDeviceInfo(id);
+}
+
+/*!
+    Destroy this audio device info.
+*/
+
+QAudioDeviceInfo::~QAudioDeviceInfo()
+{
+    delete d;
+}
+
+/*!
+    Returns human readable name of audio device.
+
+    Device names vary depending on platform/audio plugin being used.
+
+    They are a unique string identifiers for the audio device.
+
+    eg. default, Intel, U0x46d0x9a4
+*/
+
+QString QAudioDeviceInfo::deviceName() const
+{
+    return d->deviceName();
+}
+
+/*!
+    Returns true if \a settings are supported by the audio device of this QAudioDeviceInfo.
+*/
+
+bool QAudioDeviceInfo::isFormatSupported(const QAudioFormat &settings) const
+{
+    return d->isFormatSupported(settings);
+}
+
+/*!
+    Returns QAudioFormat of default settings.
+
+    These settings are provided by the platform/audio plugin being used.
+
+    They also are dependent on the QAudio::Mode being used.
+
+    A typical audio system would provide something like:
+    \list
+    \o Input settings: 8000Hz mono 8 bit.
+    \o Output settings: 44100Hz stereo 16 bit little endian.
+    \endlist
+*/
+
+QAudioFormat QAudioDeviceInfo::preferredFormat() const
+{
+    return d->preferredFormat();
+}
+
+/*!
+    Returns closest QAudioFormat to \a settings that system audio supports.
+
+    These settings are provided by the platform/audio plugin being used.
+
+    They also are dependent on the QAudio::Mode being used.
+*/
+
+QAudioFormat QAudioDeviceInfo::nearestFormat(const QAudioFormat &settings) const
+{
+    return d->nearestFormat(settings);
+}
+
+/*!
+    Returns a list of supported codecs.
+
+    All platform and plugin implementations should provide support for:
+
+    "audio/pcm" - Linear PCM
+
+    For writing plugins to support additional codecs refer to:
+
+    http://www.iana.org/assignments/media-types/audio/
+*/
+
+QStringList QAudioDeviceInfo::supportedCodecs() const
+{
+    return d->codecList();
+}
+
+/*!
+    Returns a list of supported frequencies.
+*/
+
+QList<int> QAudioDeviceInfo::supportedFrequencies() const
+{
+    return d->frequencyList();
+}
+
+/*!
+    Returns a list of supported channels.
+*/
+
+QList<int> QAudioDeviceInfo::supportedChannels() const
+{
+    return d->channelsList();
+}
+
+/*!
+    Returns a list of supported sample sizes.
+*/
+
+QList<int> QAudioDeviceInfo::supportedSampleSizes() const
+{
+    return d->sampleSizeList();
+}
+
+/*!
+    Returns a list of supported byte orders.
+*/
+
+QList<QAudioFormat::Endian> QAudioDeviceInfo::supportedByteOrders() const
+{
+    return d->byteOrderList();
+}
+
+/*!
+    Returns a list of supported sample types.
+*/
+
+QList<QAudioFormat::SampleType> QAudioDeviceInfo::supportedSampleTypes() const
+{
+    return d->sampleTypeList();
+}
+
+/*!
+    Returns the name of the default input audio device.
+    All platform and audio plugin implementations provide a default audio device to use.
+*/
+
+QAudioDeviceId QAudioDeviceInfo::defaultInputDevice()
+{
+    return QAudioDeviceFactory::defaultInputDevice();
+}
+
+/*!
+    Returns the name of the default output audio device.
+    All platform and audio plugin implementations provide a default audio device to use.
+*/
+
+QAudioDeviceId QAudioDeviceInfo::defaultOutputDevice()
+{
+    return QAudioDeviceFactory::defaultOutputDevice();
+}
+
+/*!
+    Returns a list of audio devices that support \a mode.
+*/
+
+QList<QAudioDeviceId> QAudioDeviceInfo::deviceList(QAudio::Mode mode)
+{
+    return QAudioDeviceFactory::deviceList(mode);
+}
+
+QT_END_NAMESPACE
+