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    41 

    42 #include "qaudiodevicefactory_p.h"

    43 #include "qaudiosystem.h"

    44 #include "qaudiodeviceinfo.h"

    45 

    46 #include <QtCore/qmap.h>

    47 

    48 QT_BEGIN_NAMESPACE

    49 

    50 class QAudioDeviceInfoPrivate : public QSharedData

    51 {

    52 public:

    53     QAudioDeviceInfoPrivate():info(0) {}

    54     QAudioDeviceInfoPrivate(const QString &r, const QByteArray &h, QAudio::Mode m):

    55         realm(r), handle(h), mode(m)

    56     {

    57         info = QAudioDeviceFactory::audioDeviceInfo(realm, handle, mode);

    58     }

    59 

    60     QAudioDeviceInfoPrivate(const QAudioDeviceInfoPrivate &other):

    61         QSharedData(other),

    62         realm(other.realm), handle(other.handle), mode(other.mode)

    63     {

    64         info = QAudioDeviceFactory::audioDeviceInfo(realm, handle, mode);

    65     }

    66 

    67     QAudioDeviceInfoPrivate& operator=(const QAudioDeviceInfoPrivate &other)

    68     {

    69         delete info;

    70 

    71         realm = other.realm;

    72         handle = other.handle;

    73         mode = other.mode;

    74         info = QAudioDeviceFactory::audioDeviceInfo(realm, handle, mode);

    75         return *this;

    76     }

    77 

    78     ~QAudioDeviceInfoPrivate()

    79     {

    80         delete info;

    81     }

    82 

    83     QString     realm;

    84     QByteArray  handle;

    85     QAudio::Mode mode;

    86     QAbstractAudioDeviceInfo*   info;

    87 };

    88 

    89 

    90 /*!

    91     \class QAudioDeviceInfo

    92     \brief The QAudioDeviceInfo class provides an interface to query audio devices and their functionality.

    93     \inmodule QtMultimedia

    94     \ingroup multimedia

    95 

    96     \since 4.6

    97 

    98     QAudioDeviceInfo lets you query for audio devices--such as sound

    99     cards and USB headsets--that are currently available on the system.

   100     The audio devices available are dependent on the platform or audio plugins installed.

   101 

   102     You can also query each device for the formats it supports. A

   103     format in this context is a set consisting of a specific byte

   104     order, channel, codec, frequency, sample rate, and sample type.  A

   105     format is represented by the QAudioFormat class.

   106 

   107     The values supported by the the device for each of these

   108     parameters can be fetched with

   109     supportedByteOrders(), supportedChannelCounts(), supportedCodecs(),

   110     supportedSampleRates(), supportedSampleSizes(), and

   111     supportedSampleTypes(). The combinations supported are dependent on the platform,

   112     audio plugins installed and the audio device capabilities. If you need a specific format, you can check if

   113     the device supports it with isFormatSupported(), or fetch a

   114     supported format that is as close as possible to the format with

   115     nearestFormat(). For instance:

   116 

   117     \code

   118         QAudioFormat format;

   119         format.setFrequency(44100);

   120     \endcode

   121     \dots 8

   122     \code

   123         format.setSampleType(QAudioFormat::SignedInt);

   124 

   125         QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());

   126 

   127         if (!info.isFormatSupported(format))

   128             format = info.nearestFormat(format);

   129     \endcode

   130 

   131     A QAudioDeviceInfo is used by Qt to construct

   132     classes that communicate with the device--such as

   133     QAudioInput, and QAudioOutput. The static

   134     functions defaultInputDevice(), defaultOutputDevice(), and

   135     availableDevices() let you get a list of all available

   136     devices. Devices are fetch according to the value of mode

   137     this is specified by the QAudio::Mode enum.

   138     The QAudioDeviceInfo returned are only valid for the QAudio::Mode.

   139 

   140     For instance:

   141 

   142     \code

   143     foreach(const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))

   144         qDebug() << "Device name: " << deviceInfo.deviceName();

   145     \endcode

   146 

   147     In this code sample, we loop through all devices that are able to output

   148     sound, i.e., play an audio stream in a supported format. For each device we

   149     find, we simply print the deviceName().

   150 

   151     \sa QAudioOutput, QAudioInput

   152 */

   153 

   154 /*!

   155     Constructs an empty QAudioDeviceInfo object.

   156 */

   157 

   158 QAudioDeviceInfo::QAudioDeviceInfo():

   159     d(new QAudioDeviceInfoPrivate)

   160 {

   161 }

   162 

   163 /*!

   164     Constructs a copy of \a other.

   165 */

   166 

   167 QAudioDeviceInfo::QAudioDeviceInfo(const QAudioDeviceInfo& other):

   168     d(other.d)

   169 {

   170 }

   171 

   172 /*!

   173     Destroy this audio device info.

   174 */

   175 

   176 QAudioDeviceInfo::~QAudioDeviceInfo()

   177 {

   178 }

   179 

   180 /*!

   181     Sets the QAudioDeviceInfo object to be equal to \a other.

   182 */

   183 

   184 QAudioDeviceInfo& QAudioDeviceInfo::operator=(const QAudioDeviceInfo &other)

   185 {

   186     d = other.d;

   187     return *this;

   188 }

   189 

   190 /*!

   191     Returns whether this QAudioDeviceInfo object holds a device definition.

   192 */

   193 

   194 bool QAudioDeviceInfo::isNull() const

   195 {

   196     return d->info == 0;

   197 }

   198 

   199 /*!

   200     Returns human readable name of audio device.

   201 

   202     Device names vary depending on platform/audio plugin being used.

   203 

   204     They are a unique string identifiers for the audio device.

   205 

   206     eg. default, Intel, U0x46d0x9a4

   207 */

   208 

   209 QString QAudioDeviceInfo::deviceName() const

   210 {

   211     return isNull() ? QString() : d->info->deviceName();

   212 }

   213 

   214 /*!

   215     Returns true if \a settings are supported by the audio device of this QAudioDeviceInfo.

   216 */

   217 

   218 bool QAudioDeviceInfo::isFormatSupported(const QAudioFormat &settings) const

   219 {

   220     return isNull() ? false : d->info->isFormatSupported(settings);

   221 }

   222 

   223 /*!

   224     Returns QAudioFormat of default settings.

   225 

   226     These settings are provided by the platform/audio plugin being used.

   227 

   228     They also are dependent on the QAudio::Mode being used.

   229 

   230     A typical audio system would provide something like:

   231     \list

   232     \o Input settings: 8000Hz mono 8 bit.

   233     \o Output settings: 44100Hz stereo 16 bit little endian.

   234     \endlist

   235 */

   236 

   237 QAudioFormat QAudioDeviceInfo::preferredFormat() const

   238 {

   239     return isNull() ? QAudioFormat() : d->info->preferredFormat();

   240 }

   241 

   242 /*!

   243     Returns closest QAudioFormat to \a settings that system audio supports.

   244 

   245     These settings are provided by the platform/audio plugin being used.

   246 

   247     They also are dependent on the QAudio::Mode being used.

   248 */

   249 

   250 QAudioFormat QAudioDeviceInfo::nearestFormat(const QAudioFormat &settings) const

   251 {

   252     if (isFormatSupported(settings))

   253         return settings;

   254 

   255     QAudioFormat nearest = settings;

   256 

   257     QList<QString> testCodecs = supportedCodecs();

   258     QList<int> testChannels = supportedChannels();

   259     QList<QAudioFormat::Endian> testByteOrders = supportedByteOrders();

   260     QList<QAudioFormat::SampleType> testSampleTypes;

   261     QList<QAudioFormat::SampleType> sampleTypesAvailable = supportedSampleTypes();

   262     QMap<int,int> testFrequencies;

   263     QList<int> frequenciesAvailable = supportedFrequencies();

   264     QMap<int,int> testSampleSizes;

   265     QList<int> sampleSizesAvailable = supportedSampleSizes();

   266 

   267     // Get sorted lists for checking

   268     if (testCodecs.contains(settings.codec())) {

   269         testCodecs.removeAll(settings.codec());

   270         testCodecs.insert(0, settings.codec());

   271     }

   272     testChannels.removeAll(settings.channels());

   273     testChannels.insert(0, settings.channels());

   274     testByteOrders.removeAll(settings.byteOrder());

   275     testByteOrders.insert(0, settings.byteOrder());

   276 

   277     if (sampleTypesAvailable.contains(settings.sampleType()))

   278         testSampleTypes.append(settings.sampleType());

   279     if (sampleTypesAvailable.contains(QAudioFormat::SignedInt))

   280         testSampleTypes.append(QAudioFormat::SignedInt);

   281     if (sampleTypesAvailable.contains(QAudioFormat::UnSignedInt))

   282         testSampleTypes.append(QAudioFormat::UnSignedInt);

   283     if (sampleTypesAvailable.contains(QAudioFormat::Float))

   284         testSampleTypes.append(QAudioFormat::Float);

   285 

   286     if (sampleSizesAvailable.contains(settings.sampleSize()))

   287         testSampleSizes.insert(0,settings.sampleSize());

   288     sampleSizesAvailable.removeAll(settings.sampleSize());

   289     foreach (int size, sampleSizesAvailable) {

   290         int larger  = (size > settings.sampleSize()) ? size : settings.sampleSize();

   291         int smaller = (size > settings.sampleSize()) ? settings.sampleSize() : size;

   292         bool isMultiple = ( 0 == (larger % smaller));

   293         int diff = larger - smaller;

   294         testSampleSizes.insert((isMultiple ? diff : diff+100000), size);

   295     }

   296     if (frequenciesAvailable.contains(settings.frequency()))

   297         testFrequencies.insert(0,settings.frequency());

   298     frequenciesAvailable.removeAll(settings.frequency());

   299     foreach (int frequency, frequenciesAvailable) {

   300         int larger  = (frequency > settings.frequency()) ? frequency : settings.frequency();

   301         int smaller = (frequency > settings.frequency()) ? settings.frequency() : frequency;

   302         bool isMultiple = ( 0 == (larger % smaller));

   303         int diff = larger - smaller;

   304         testFrequencies.insert((isMultiple ? diff : diff+100000), frequency);

   305     }

   306 

   307     // Try to find nearest

   308     foreach (QString codec, testCodecs) {

   309         nearest.setCodec(codec);

   310         foreach (QAudioFormat::Endian order, testByteOrders) {

   311             nearest.setByteOrder(order);

   312             foreach (QAudioFormat::SampleType sample, testSampleTypes) {

   313                 nearest.setSampleType(sample);

   314                 QMapIterator<int, int> sz(testSampleSizes);

   315                 while (sz.hasNext()) {

   316                     sz.next();

   317                     nearest.setSampleSize(sz.value());

   318                     foreach (int channel, testChannels) {

   319                         nearest.setChannels(channel);

   320                         QMapIterator<int, int> i(testFrequencies);

   321                         while (i.hasNext()) {

   322                             i.next();

   323                             nearest.setFrequency(i.value());

   324                             if (isFormatSupported(nearest))

   325                                 return nearest;

   326                         }

   327                     }

   328                 }

   329             }

   330         }

   331     }

   332     //Fallback

   333     return preferredFormat();

   334 }

   335 

   336 /*!

   337     Returns a list of supported codecs.

   338 

   339     All platform and plugin implementations should provide support for:

   340 

   341     "audio/pcm" - Linear PCM

   342 

   343     For writing plugins to support additional codecs refer to:

   344 

   345     http://www.iana.org/assignments/media-types/audio/

   346 */

   347 

   348 QStringList QAudioDeviceInfo::supportedCodecs() const

   349 {

   350     return isNull() ? QStringList() : d->info->supportedCodecs();

   351 }

   352 

   353 /*!

   354     Returns a list of supported sample rates.

   355 

   356     \since 4.7

   357 */

   358 

   359 QList<int> QAudioDeviceInfo::supportedSampleRates() const

   360 {

   361     return supportedFrequencies();

   362 }

   363 

   364 /*!

   365     \obsolete

   366 

   367     Use supportedSampleRates() instead.

   368 */

   369 

   370 QList<int> QAudioDeviceInfo::supportedFrequencies() const

   371 {

   372     return isNull() ? QList<int>() : d->info->supportedSampleRates();

   373 }

   374 

   375 /*!

   376     Returns a list of supported channel counts.

   377 

   378     \since 4.7

   379 */

   380 

   381 QList<int> QAudioDeviceInfo::supportedChannelCounts() const

   382 {

   383     return supportedChannels();

   384 }

   385 

   386 /*!

   387     \obsolete

   388 

   389     Use supportedChannelCount() instead.

   390 */

   391 

   392 QList<int> QAudioDeviceInfo::supportedChannels() const

   393 {

   394     return isNull() ? QList<int>() : d->info->supportedChannelCounts();

   395 }

   396 

   397 /*!

   398     Returns a list of supported sample sizes.

   399 */

   400 

   401 QList<int> QAudioDeviceInfo::supportedSampleSizes() const

   402 {

   403     return isNull() ? QList<int>() : d->info->supportedSampleSizes();

   404 }

   405 

   406 /*!

   407     Returns a list of supported byte orders.

   408 */

   409 

   410 QList<QAudioFormat::Endian> QAudioDeviceInfo::supportedByteOrders() const

   411 {

   412     return isNull() ? QList<QAudioFormat::Endian>() : d->info->supportedByteOrders();

   413 }

   414 

   415 /*!

   416     Returns a list of supported sample types.

   417 */

   418 

   419 QList<QAudioFormat::SampleType> QAudioDeviceInfo::supportedSampleTypes() const

   420 {

   421     return isNull() ? QList<QAudioFormat::SampleType>() : d->info->supportedSampleTypes();

   422 }

   423 

   424 /*!

   425     Returns the name of the default input audio device.

   426     All platform and audio plugin implementations provide a default audio device to use.

   427 */

   428 

   429 QAudioDeviceInfo QAudioDeviceInfo::defaultInputDevice()

   430 {

   431     return QAudioDeviceFactory::defaultInputDevice();

   432 }

   433 

   434 /*!

   435     Returns the name of the default output audio device.

   436     All platform and audio plugin implementations provide a default audio device to use.

   437 */

   438 

   439 QAudioDeviceInfo QAudioDeviceInfo::defaultOutputDevice()

   440 {

   441     return QAudioDeviceFactory::defaultOutputDevice();

   442 }

   443 

   444 /*!

   445     Returns a list of audio devices that support \a mode.

   446 */

   447 

   448 QList<QAudioDeviceInfo> QAudioDeviceInfo::availableDevices(QAudio::Mode mode)

   449 {

   450     return QAudioDeviceFactory::availableDevices(mode);

   451 }

   452 

   453 

   454 /*!

   455     \internal

   456 */

   457 

   458 QAudioDeviceInfo::QAudioDeviceInfo(const QString &realm, const QByteArray &handle, QAudio::Mode mode):

   459     d(new QAudioDeviceInfoPrivate(realm, handle, mode))

   460 {

   461 }

   462 

   463 /*!

   464     \internal

   465 */

   466 

   467 QString QAudioDeviceInfo::realm() const

   468 {

   469     return d->realm;

   470 }

   471 

   472 /*!

   473     \internal

   474 */

   475 

   476 QByteArray QAudioDeviceInfo::handle() const

   477 {

   478     return d->handle;

   479 }

   480 

   481 

   482 /*!

   483     \internal

   484 */

   485 

   486 QAudio::Mode QAudioDeviceInfo::mode() const

   487 {

   488     return d->mode;

   489 }

   490 

   491 QT_END_NAMESPACE

   492