              
QRadioTuner Class ReferenceThe QRadioTuner class provides an interface to the systems analog radio device. More... #include <QRadioTuner> Inherits QMediaObject. Public Types
Properties
Public Functions
Reimplemented Public Functions
Public Slots
Signals
Additional Inherited Members
Detailed DescriptionThe QRadioTuner class provides an interface to the systems analog radio device. You can control the systems analog radio device using this interface, for example: radio = new QRadioTuner;
connect(radio, SIGNAL(frequencyChanged(int)), this, SLOT(freqChanged(int)));
if (radio->isBandSupported(QRadioTuner::FM)) {
radio->setBand(QRadioTuner::FM);
radio->setFrequency(yourRadioStationFrequency);
radio->setVolume(100);
radio->start();
}
The radio object will emit signals for any changes in state such as: bandChanged(), frequencyChanged(), stereoStatusChanged(), searchingChanged(), signalStrengthChanged(), volumeChanged(), mutedChanged(). You can change between the frequency bands using setBand() however it is recommended that you check to make sure the band is available first using isBandSupported(). Member Type Documentation
|
| Constant | Value | Description |
|---|---|---|
| QRadioTuner::AM | 0 | 520 to 1610 kHz, 9 or 10kHz channel spacing, extended 1610 to 1710 kHz |
| QRadioTuner::FM | 1 | 87.5 to 108.0 MHz, except Japan 76-90 MHz |
| QRadioTuner::SW | 2 | 1.711 to 30.0 MHz, divided into 15 bands. 5kHz channel spacing |
| QRadioTuner::LW | 3 | 148.5 to 283.5 kHz, 9kHz channel spacing (Europe, Africa, Asia) |
| QRadioTuner::FM2 | 4 | range not defined, used when area supports more than one FM range. |
enum QRadioTuner::Error
Enumerates radio tuner error conditions.
| Constant | Value | Description |
|---|---|---|
| QRadioTuner::NoError | 0 | No errors have occurred. |
| QRadioTuner::ResourceError | 1 | There is no radio service available. |
| QRadioTuner::OpenError | 2 | Unable to open radio device. |
| QRadioTuner::OutOfRangeError | 3 | An attempt to set a frequency or band that is not supported by radio device. |
enum QRadioTuner::State
Enumerates radio tuner states.
| Constant | Value | Description |
|---|---|---|
| QRadioTuner::ActiveState | 0 | The tuner is started and active. |
| QRadioTuner::StoppedState | 1 | The tuner device is stopped. |
enum QRadioTuner::StereoMode
Enumerates radio tuner policy for receiving stereo signals.
| Constant | Value | Description |
|---|---|---|
| QRadioTuner::Auto | 2 | Uses the stereo mode matching the station. |
| QRadioTuner::ForceStereo | 0 | Provide stereo mode, converting if required. |
| QRadioTuner::ForceMono | 1 | Provide mono mode, converting if required. |
Property Documentation
band : Band
This property holds the frequency band a radio tuner is tuned to.
Access functions:
| Band | band () const |
| void | setBand ( Band band ) |
Notifier signal:
| void | bandChanged ( QRadioTuner::Band band ) |
See also QRadioTuner::Band.
frequency : int
This property holds the frequency in Hertz a radio tuner is tuned to.
Access functions:
| int | frequency () const |
| void | setFrequency ( int frequency ) |
Notifier signal:
| void | frequencyChanged ( int frequency ) |
muted : bool
This property holds whether a radio tuner's audio output is muted.
Access functions:
| bool | isMuted () const |
| void | setMuted ( bool muted ) |
Notifier signal:
| void | mutedChanged ( bool muted ) |
searching : const bool
This property holds whether a radio tuner is currently scanning for a signal.
Access functions:
| bool | isSearching () const |
Notifier signal:
| void | searchingChanged ( bool searching ) |
See also searchForward(), searchBackward(), and cancelSearch().
signalStrength : const int
This property holds the strength of the current radio signal as a percentage.
Access functions:
| int | signalStrength () const |
Notifier signal:
| void | signalStrengthChanged ( int strength ) |
state : const State
Return the current radio tuner state.
Access functions:
| State | state () const |
Notifier signal:
| void | stateChanged ( QRadioTuner::State state ) |
See also QRadioTuner::State.
stereo : const bool
This property holds whether a radio tuner is receiving a stereo signal.
Access functions:
| bool | isStereo () const |
Notifier signal:
| void | stereoStatusChanged ( bool stereo ) |
stereoMode : StereoMode
This property holds the stereo mode of a radio tuner.
Access functions:
| StereoMode | stereoMode () const |
| void | setStereoMode ( QRadioTuner::StereoMode mode ) |
volume : int
This property holds the volume of a radio tuner's audio output as a percentage.
Access functions:
| int | volume () const |
| void | setVolume ( int volume ) |
Notifier signal:
| void | volumeChanged ( int volume ) |
Member Function Documentation
QRadioTuner::QRadioTuner ( QObject * parent = 0, QMediaServiceProvider * provider = QMediaServiceProvider::defaultServiceProvider() )
Constructs a radio tuner based on a media service allocated by a media service provider.
The parent is passed to QMediaObject.
QRadioTuner::~QRadioTuner ()
Destroys a radio tuner.
QtMultimediaKit::AvailabilityError QRadioTuner::availabilityError () const [virtual]
Reimplemented from QMediaObject::availabilityError().
Returns the availability error state.
void QRadioTuner::bandChanged ( QRadioTuner::Band band ) [signal]
Signals a radio tuner's band has changed.
void QRadioTuner::cancelSearch () [slot]
Stops scanning for a signal.
See also searchForward(), searchBackward(), and searching.
Error QRadioTuner::error () const
Returns the error state of a radio tuner.
See also errorString().
void QRadioTuner::error ( QRadioTuner::Error error ) [signal]
Signals that an error occurred.
QString QRadioTuner::errorString () const
Returns a description of a radio tuner's error state.
See also error().
void QRadioTuner::frequencyChanged ( int frequency ) [signal]
Signals that the frequency a radio tuner is tuned to has changed.
QPair<int, int> QRadioTuner::frequencyRange ( Band band ) const
Returns a frequency band's minimum and maximum frequency.
int QRadioTuner::frequencyStep ( Band band ) const
Returns the number of Hertz to increment the frequency by when stepping through frequencies within a given band.
bool QRadioTuner::isAvailable () const [virtual]
Reimplemented from QMediaObject::isAvailable().
Returns true if the radio tuner service is ready to use.
bool QRadioTuner::isBandSupported ( Band band ) const
Identifies if a frequency band is supported by a radio tuner.
Returns true if the band is supported, and false if it is not.
void QRadioTuner::mutedChanged ( bool muted ) [signal]
Signals that the muted state of a radio tuner's audio output has changed.
void QRadioTuner::searchBackward () [slot]
Starts a backwards scan for a signal, starting from the current frequency.
See also searchForward(), cancelSearch(), and searching.
void QRadioTuner::searchForward () [slot]
Starts a forward scan for a signal, starting from the current frequency.
See also searchBackward(), cancelSearch(), and searching.
void QRadioTuner::searchingChanged ( bool searching ) [signal]
Signals that the searching state of a radio tuner has changed.
void QRadioTuner::signalStrengthChanged ( int strength ) [signal]
Signals that the strength of the signal received by a radio tuner has changed.
void QRadioTuner::start () [slot]
Activate the radio device.
void QRadioTuner::stateChanged ( QRadioTuner::State state ) [signal]
This signal is emitted when the state changes to state.
void QRadioTuner::stereoStatusChanged ( bool stereo ) [signal]
Signals that the stereo state of a radio tuner has changed.
void QRadioTuner::stop () [slot]
Deactivate the radio device.
void QRadioTuner::volumeChanged ( int volume ) [signal]
Signals that the volume of a radio tuner's audio output has changed.