--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/qtmobility/src/multimedia/audio/qaudiodeviceinfo.cpp Wed Jun 23 19:08:38 2010 +0300
@@ -0,0 +1,492 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "qaudiodevicefactory_p.h"
+#include "qaudiosystem.h"
+#include "qaudiodeviceinfo.h"
+
+#include <QtCore/qmap.h>
+
+QT_BEGIN_NAMESPACE
+
+class QAudioDeviceInfoPrivate : public QSharedData
+{
+public:
+ QAudioDeviceInfoPrivate():info(0) {}
+ QAudioDeviceInfoPrivate(const QString &r, const QByteArray &h, QAudio::Mode m):
+ realm(r), handle(h), mode(m)
+ {
+ info = QAudioDeviceFactory::audioDeviceInfo(realm, handle, mode);
+ }
+
+ QAudioDeviceInfoPrivate(const QAudioDeviceInfoPrivate &other):
+ QSharedData(other),
+ realm(other.realm), handle(other.handle), mode(other.mode)
+ {
+ info = QAudioDeviceFactory::audioDeviceInfo(realm, handle, mode);
+ }
+
+ QAudioDeviceInfoPrivate& operator=(const QAudioDeviceInfoPrivate &other)
+ {
+ delete info;
+
+ realm = other.realm;
+ handle = other.handle;
+ mode = other.mode;
+ info = QAudioDeviceFactory::audioDeviceInfo(realm, handle, mode);
+ return *this;
+ }
+
+ ~QAudioDeviceInfoPrivate()
+ {
+ delete info;
+ }
+
+ QString realm;
+ QByteArray handle;
+ QAudio::Mode mode;
+ QAbstractAudioDeviceInfo* info;
+};
+
+
+/*!
+ \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(), supportedChannelCounts(), supportedCodecs(),
+ supportedSampleRates(), 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(). For instance:
+
+ \code
+ QAudioFormat format;
+ format.setFrequency(44100);
+ \endcode
+ \dots 8
+ \code
+ format.setSampleType(QAudioFormat::SignedInt);
+
+ QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
+
+ if (!info.isFormatSupported(format))
+ format = info.nearestFormat(format);
+ \endcode
+
+ A QAudioDeviceInfo is used by Qt to construct
+ classes that communicate with the device--such as
+ QAudioInput, and QAudioOutput. The static
+ functions defaultInputDevice(), defaultOutputDevice(), and
+ availableDevices() let you get a list of all available
+ devices. Devices are fetch according to the value of mode
+ this is specified by the QAudio::Mode enum.
+ The QAudioDeviceInfo returned are only valid for the QAudio::Mode.
+
+ For instance:
+
+ \code
+ foreach(const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
+ qDebug() << "Device name: " << deviceInfo.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
+*/
+
+/*!
+ Constructs an empty QAudioDeviceInfo object.
+*/
+
+QAudioDeviceInfo::QAudioDeviceInfo():
+ d(new QAudioDeviceInfoPrivate)
+{
+}
+
+/*!
+ Constructs a copy of \a other.
+*/
+
+QAudioDeviceInfo::QAudioDeviceInfo(const QAudioDeviceInfo& other):
+ d(other.d)
+{
+}
+
+/*!
+ Destroy this audio device info.
+*/
+
+QAudioDeviceInfo::~QAudioDeviceInfo()
+{
+}
+
+/*!
+ Sets the QAudioDeviceInfo object to be equal to \a other.
+*/
+
+QAudioDeviceInfo& QAudioDeviceInfo::operator=(const QAudioDeviceInfo &other)
+{
+ d = other.d;
+ return *this;
+}
+
+/*!
+ Returns whether this QAudioDeviceInfo object holds a device definition.
+*/
+
+bool QAudioDeviceInfo::isNull() const
+{
+ return d->info == 0;
+}
+
+/*!
+ 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 isNull() ? QString() : d->info->deviceName();
+}
+
+/*!
+ Returns true if \a settings are supported by the audio device of this QAudioDeviceInfo.
+*/
+
+bool QAudioDeviceInfo::isFormatSupported(const QAudioFormat &settings) const
+{
+ return isNull() ? false : d->info->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 isNull() ? QAudioFormat() : d->info->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
+{
+ if (isFormatSupported(settings))
+ return settings;
+
+ QAudioFormat nearest = settings;
+
+ QList<QString> testCodecs = supportedCodecs();
+ QList<int> testChannels = supportedChannels();
+ QList<QAudioFormat::Endian> testByteOrders = supportedByteOrders();
+ QList<QAudioFormat::SampleType> testSampleTypes;
+ QList<QAudioFormat::SampleType> sampleTypesAvailable = supportedSampleTypes();
+ QMap<int,int> testFrequencies;
+ QList<int> frequenciesAvailable = supportedFrequencies();
+ QMap<int,int> testSampleSizes;
+ QList<int> sampleSizesAvailable = supportedSampleSizes();
+
+ // Get sorted lists for checking
+ if (testCodecs.contains(settings.codec())) {
+ testCodecs.removeAll(settings.codec());
+ testCodecs.insert(0, settings.codec());
+ }
+ testChannels.removeAll(settings.channels());
+ testChannels.insert(0, settings.channels());
+ testByteOrders.removeAll(settings.byteOrder());
+ testByteOrders.insert(0, settings.byteOrder());
+
+ if (sampleTypesAvailable.contains(settings.sampleType()))
+ testSampleTypes.append(settings.sampleType());
+ if (sampleTypesAvailable.contains(QAudioFormat::SignedInt))
+ testSampleTypes.append(QAudioFormat::SignedInt);
+ if (sampleTypesAvailable.contains(QAudioFormat::UnSignedInt))
+ testSampleTypes.append(QAudioFormat::UnSignedInt);
+ if (sampleTypesAvailable.contains(QAudioFormat::Float))
+ testSampleTypes.append(QAudioFormat::Float);
+
+ if (sampleSizesAvailable.contains(settings.sampleSize()))
+ testSampleSizes.insert(0,settings.sampleSize());
+ sampleSizesAvailable.removeAll(settings.sampleSize());
+ foreach (int size, sampleSizesAvailable) {
+ int larger = (size > settings.sampleSize()) ? size : settings.sampleSize();
+ int smaller = (size > settings.sampleSize()) ? settings.sampleSize() : size;
+ bool isMultiple = ( 0 == (larger % smaller));
+ int diff = larger - smaller;
+ testSampleSizes.insert((isMultiple ? diff : diff+100000), size);
+ }
+ if (frequenciesAvailable.contains(settings.frequency()))
+ testFrequencies.insert(0,settings.frequency());
+ frequenciesAvailable.removeAll(settings.frequency());
+ foreach (int frequency, frequenciesAvailable) {
+ int larger = (frequency > settings.frequency()) ? frequency : settings.frequency();
+ int smaller = (frequency > settings.frequency()) ? settings.frequency() : frequency;
+ bool isMultiple = ( 0 == (larger % smaller));
+ int diff = larger - smaller;
+ testFrequencies.insert((isMultiple ? diff : diff+100000), frequency);
+ }
+
+ // Try to find nearest
+ foreach (QString codec, testCodecs) {
+ nearest.setCodec(codec);
+ foreach (QAudioFormat::Endian order, testByteOrders) {
+ nearest.setByteOrder(order);
+ foreach (QAudioFormat::SampleType sample, testSampleTypes) {
+ nearest.setSampleType(sample);
+ QMapIterator<int, int> sz(testSampleSizes);
+ while (sz.hasNext()) {
+ sz.next();
+ nearest.setSampleSize(sz.value());
+ foreach (int channel, testChannels) {
+ nearest.setChannels(channel);
+ QMapIterator<int, int> i(testFrequencies);
+ while (i.hasNext()) {
+ i.next();
+ nearest.setFrequency(i.value());
+ if (isFormatSupported(nearest))
+ return nearest;
+ }
+ }
+ }
+ }
+ }
+ }
+ //Fallback
+ return preferredFormat();
+}
+
+/*!
+ 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 isNull() ? QStringList() : d->info->supportedCodecs();
+}
+
+/*!
+ Returns a list of supported sample rates.
+
+ \since 4.7
+*/
+
+QList<int> QAudioDeviceInfo::supportedSampleRates() const
+{
+ return supportedFrequencies();
+}
+
+/*!
+ \obsolete
+
+ Use supportedSampleRates() instead.
+*/
+
+QList<int> QAudioDeviceInfo::supportedFrequencies() const
+{
+ return isNull() ? QList<int>() : d->info->supportedSampleRates();
+}
+
+/*!
+ Returns a list of supported channel counts.
+
+ \since 4.7
+*/
+
+QList<int> QAudioDeviceInfo::supportedChannelCounts() const
+{
+ return supportedChannels();
+}
+
+/*!
+ \obsolete
+
+ Use supportedChannelCount() instead.
+*/
+
+QList<int> QAudioDeviceInfo::supportedChannels() const
+{
+ return isNull() ? QList<int>() : d->info->supportedChannelCounts();
+}
+
+/*!
+ Returns a list of supported sample sizes.
+*/
+
+QList<int> QAudioDeviceInfo::supportedSampleSizes() const
+{
+ return isNull() ? QList<int>() : d->info->supportedSampleSizes();
+}
+
+/*!
+ Returns a list of supported byte orders.
+*/
+
+QList<QAudioFormat::Endian> QAudioDeviceInfo::supportedByteOrders() const
+{
+ return isNull() ? QList<QAudioFormat::Endian>() : d->info->supportedByteOrders();
+}
+
+/*!
+ Returns a list of supported sample types.
+*/
+
+QList<QAudioFormat::SampleType> QAudioDeviceInfo::supportedSampleTypes() const
+{
+ return isNull() ? QList<QAudioFormat::SampleType>() : d->info->supportedSampleTypes();
+}
+
+/*!
+ Returns the name of the default input audio device.
+ All platform and audio plugin implementations provide a default audio device to use.
+*/
+
+QAudioDeviceInfo 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.
+*/
+
+QAudioDeviceInfo QAudioDeviceInfo::defaultOutputDevice()
+{
+ return QAudioDeviceFactory::defaultOutputDevice();
+}
+
+/*!
+ Returns a list of audio devices that support \a mode.
+*/
+
+QList<QAudioDeviceInfo> QAudioDeviceInfo::availableDevices(QAudio::Mode mode)
+{
+ return QAudioDeviceFactory::availableDevices(mode);
+}
+
+
+/*!
+ \internal
+*/
+
+QAudioDeviceInfo::QAudioDeviceInfo(const QString &realm, const QByteArray &handle, QAudio::Mode mode):
+ d(new QAudioDeviceInfoPrivate(realm, handle, mode))
+{
+}
+
+/*!
+ \internal
+*/
+
+QString QAudioDeviceInfo::realm() const
+{
+ return d->realm;
+}
+
+/*!
+ \internal
+*/
+
+QByteArray QAudioDeviceInfo::handle() const
+{
+ return d->handle;
+}
+
+
+/*!
+ \internal
+*/
+
+QAudio::Mode QAudioDeviceInfo::mode() const
+{
+ return d->mode;
+}
+
+QT_END_NAMESPACE
+