QAbstractAudioOutput Class
The QAbstractAudioOutput class is a base class for audio backends. More...
| Header: | #include <QAbstractAudioOutput> |
| qmake: | QT += multimedia |
| Inherits: | QObject |
Public Functions
| virtual int | bufferSize() const = 0 |
| virtual int | bytesFree() const = 0 |
| virtual qint64 | elapsedUSecs() const = 0 |
| virtual QAudio::Error | error() const = 0 |
| virtual QAudioFormat | format() const = 0 |
| virtual int | notifyInterval() const = 0 |
| virtual int | periodSize() const = 0 |
| virtual qint64 | processedUSecs() const = 0 |
| virtual void | reset() = 0 |
| virtual void | resume() = 0 |
| virtual void | setBufferSize(int value) = 0 |
| virtual void | setFormat(const QAudioFormat &fmt) = 0 |
| virtual void | setNotifyInterval(int ms) = 0 |
| virtual void | setVolume(qreal volume) |
| virtual void | start(QIODevice *device) = 0 |
| virtual QIODevice * | start() = 0 |
| virtual QAudio::State | state() const = 0 |
| virtual void | stop() = 0 |
| virtual void | suspend() = 0 |
| virtual qreal | volume() const |
Signals
| void | errorChanged(QAudio::Error error) |
| void | notify() |
| void | stateChanged(QAudio::State state) |
Detailed Description
QAbstractAudioOutput implements audio functionality for QAudioOutput, i.e., QAudioOutput routes function calls to QAbstractAudioOutput. For a description of the functionality that is implemented, see the QAudioOutput class and function descriptions.
See also QAudioOutput.
Member Function Documentation
[signal] void QAbstractAudioOutput::errorChanged(QAudio::Error error)
This signal is emitted when the error state has changed.
[signal] void QAbstractAudioOutput::notify()
This signal is emitted when x ms of audio data has been processed the interval set by setNotifyInterval(x).
[signal] void QAbstractAudioOutput::stateChanged(QAudio::State state)
This signal is emitted when the device state has changed.
[pure virtual] int QAbstractAudioOutput::bufferSize() const
Returns the audio buffer size in bytes.
See also setBufferSize().
[pure virtual] int QAbstractAudioOutput::bytesFree() const
Returns the free space available in bytes in the audio buffer.
[pure virtual] qint64 QAbstractAudioOutput::elapsedUSecs() const
Returns the milliseconds since start() was called, including time in Idle and suspend states.
[pure virtual] QAudio::Error QAbstractAudioOutput::error() const
Returns the error state.
[pure virtual] QAudioFormat QAbstractAudioOutput::format() const
Returns the QAudioFormat being used.
See also setFormat().
[pure virtual] int QAbstractAudioOutput::notifyInterval() const
Returns the notify interval in milliseconds.
See also setNotifyInterval().
[pure virtual] int QAbstractAudioOutput::periodSize() const
Returns the period size in bytes.
[pure virtual] qint64 QAbstractAudioOutput::processedUSecs() const
Returns the amount of audio data processed since start() was called in milliseconds.
[pure virtual] void QAbstractAudioOutput::reset()
Drops all audio data in the buffers, resets buffers to zero.
[pure virtual] void QAbstractAudioOutput::resume()
Resumes processing audio data after a suspend()
[pure virtual] void QAbstractAudioOutput::setBufferSize(int value)
Sets the audio buffer size to value in bytes.
See also bufferSize().
[pure virtual] void QAbstractAudioOutput::setFormat(const QAudioFormat &fmt)
Set the QAudioFormat to use to fmt. Setting the format is only allowable while in QAudio::StoppedState.
See also format().
[pure virtual] void QAbstractAudioOutput::setNotifyInterval(int ms)
Sets the interval for notify() signal to be emitted. This is based on the ms of audio data processed not on actual real-time. The resolution of the timer is platform specific.
See also notifyInterval().
[virtual] void QAbstractAudioOutput::setVolume(qreal volume)
Sets the volume. Where volume is between 0.0 and 1.0.
See also volume().
[pure virtual] void QAbstractAudioOutput::start(QIODevice *device)
Uses the device as the QIODevice to transfer data.
[pure virtual] QIODevice *QAbstractAudioOutput::start()
Returns a pointer to the QIODevice being used to handle the data transfer. This QIODevice can be used to write() audio data directly.
[pure virtual] QAudio::State QAbstractAudioOutput::state() const
Returns the state of audio processing.
[pure virtual] void QAbstractAudioOutput::stop()
Stops the audio output.
[pure virtual] void QAbstractAudioOutput::suspend()
Stops processing audio data, preserving buffered audio data.
[virtual] qreal QAbstractAudioOutput::volume() const
Returns the volume in the range 0.0 and 1.0.
See also setVolume().