Base class for an audio device with synchronised input and output channels. More...

#include <juce_AudioIODevice.h>

Inheritance diagram for juce::AudioIODevice:

Collaboration diagram for juce::AudioIODevice:

Public Member Functions
virtual	~AudioIODevice ()
	Destructor. More...

virtual void	close ()=0
	Closes and releases the device if it's open. More...

virtual BigInteger	getActiveInputChannels () const =0
	Returns a mask showing which of the available input channels are currently enabled. More...

virtual BigInteger	getActiveOutputChannels () const =0
	Returns a mask showing which of the available output channels are currently enabled. More...

virtual Array< int >	getAvailableBufferSizes ()=0
	Returns the set of buffer sizes that are available. More...

virtual Array< double >	getAvailableSampleRates ()=0
	Returns the set of sample-rates this device supports. More...

virtual int	getCurrentBitDepth ()=0
	Returns the device's current physical bit-depth. More...

virtual int	getCurrentBufferSizeSamples ()=0
	Returns the buffer size that the device is currently using. More...

virtual double	getCurrentSampleRate ()=0
	Returns the sample rate that the device is currently using. More...

virtual int	getDefaultBufferSize ()=0
	Returns the default buffer-size to use. More...

virtual StringArray	getInputChannelNames ()=0
	Returns the names of all the available input channels on this device. More...

virtual int	getInputLatencyInSamples ()=0
	Returns the device's input latency. More...

virtual String	getLastError ()=0
	Returns the last error that happened if anything went wrong. More...

const String &	getName () const noexcept
	Returns the device's name, (as set in the constructor). More...

virtual StringArray	getOutputChannelNames ()=0
	Returns the names of all the available output channels on this device. More...

virtual int	getOutputLatencyInSamples ()=0
	Returns the device's output latency. More...

const String &	getTypeName () const noexcept
	Returns the type of the device. More...

virtual int	getXRunCount () const noexcept
	Returns the number of under- or over runs reported by the OS since playback/recording has started. More...

virtual bool	hasControlPanel () const
	True if this device can show a pop-up control panel for editing its settings. More...

virtual bool	isOpen ()=0
	Returns true if the device is still open. More...

virtual bool	isPlaying ()=0
	Returns true if the device is still calling back. More...

virtual String	open (const BigInteger &inputChannels, const BigInteger &outputChannels, double sampleRate, int bufferSizeSamples)=0
	Tries to open the device ready to play. More...

virtual bool	setAudioPreprocessingEnabled (bool shouldBeEnabled)
	On devices which support it, this allows automatic gain control or other mic processing to be disabled. More...

virtual bool	showControlPanel ()
	Shows a device-specific control panel if there is one. More...

virtual void	start (AudioIODeviceCallback *callback)=0
	Starts the device actually playing. More...

virtual void	stop ()=0
	Stops the device playing. More...

Protected Member Functions
	AudioIODevice (const String &deviceName, const String &typeName)
	Creates a device, setting its name and type member variables. More...

Protected Attributes
String	name

String	typeName

Detailed Description

Base class for an audio device with synchronised input and output channels.

Subclasses of this are used to implement different protocols such as DirectSound, ASIO, CoreAudio, etc.

To create one of these, you'll need to use the AudioIODeviceType class - see the documentation for that class for more info.

For an easier way of managing audio devices and their settings, have a look at the AudioDeviceManager class.

See also: AudioIODeviceType, AudioDeviceManager

{Audio}

Constructor & Destructor Documentation

◆ ~AudioIODevice()

virtual juce::AudioIODevice::~AudioIODevice ( )

virtual

Destructor.

◆ AudioIODevice()

juce::AudioIODevice::AudioIODevice	(	const String &	deviceName,
		const String &	typeName
	)

protected

Creates a device, setting its name and type member variables.

Member Function Documentation

◆ close()

virtual void juce::AudioIODevice::close ( )

pure virtual

Closes and releases the device if it's open.

Implemented in juce::iOSAudioIODevice.

◆ getActiveInputChannels()

virtual BigInteger juce::AudioIODevice::getActiveInputChannels ( ) const

pure virtual

Returns a mask showing which of the available input channels are currently enabled.

See also: getInputChannelNames

Implemented in juce::iOSAudioIODevice.

Referenced by juce::StandalonePluginHolder::audioDeviceAboutToStart().

◆ getActiveOutputChannels()

virtual BigInteger juce::AudioIODevice::getActiveOutputChannels ( ) const

pure virtual

Returns a mask showing which of the available output channels are currently enabled.

See also: getOutputChannelNames

Implemented in juce::iOSAudioIODevice.

◆ getAvailableBufferSizes()

virtual Array<int> juce::AudioIODevice::getAvailableBufferSizes ( )

pure virtual

Returns the set of buffer sizes that are available.

See also: getCurrentBufferSizeSamples, getDefaultBufferSize

Implemented in juce::iOSAudioIODevice.

◆ getAvailableSampleRates()

virtual Array<double> juce::AudioIODevice::getAvailableSampleRates ( )

pure virtual

Returns the set of sample-rates this device supports.

See also: getCurrentSampleRate

Implemented in juce::iOSAudioIODevice.

◆ getCurrentBitDepth()

virtual int juce::AudioIODevice::getCurrentBitDepth ( )

pure virtual

Returns the device's current physical bit-depth.

If the device isn't actually open, this value doesn't really mean much.

Implemented in juce::iOSAudioIODevice.

◆ getCurrentBufferSizeSamples()

virtual int juce::AudioIODevice::getCurrentBufferSizeSamples ( )

pure virtual

Returns the buffer size that the device is currently using.

If the device isn't actually open, this value doesn't really mean much.

Implemented in juce::iOSAudioIODevice.

Referenced by juce::StandalonePluginHolder::audioDeviceAboutToStart().

◆ getCurrentSampleRate()

virtual double juce::AudioIODevice::getCurrentSampleRate ( )

pure virtual

Returns the sample rate that the device is currently using.

If the device isn't actually open, this value doesn't really mean much.

Implemented in juce::iOSAudioIODevice.

◆ getDefaultBufferSize()

virtual int juce::AudioIODevice::getDefaultBufferSize ( )

pure virtual

Returns the default buffer-size to use.

Returns: a number of samples

See also: getAvailableBufferSizes

Implemented in juce::iOSAudioIODevice.

◆ getInputChannelNames()

virtual StringArray juce::AudioIODevice::getInputChannelNames ( )

pure virtual

Returns the names of all the available input channels on this device.

To find out which of these are currently in use, call getActiveInputChannels().

Implemented in juce::iOSAudioIODevice.

◆ getInputLatencyInSamples()

virtual int juce::AudioIODevice::getInputLatencyInSamples ( )

pure virtual

Returns the device's input latency.

This is the delay in samples between some audio actually arriving at the soundcard, and the callback getting passed this block of data.

Implemented in juce::iOSAudioIODevice.

◆ getLastError()

virtual String juce::AudioIODevice::getLastError ( )

pure virtual

Returns the last error that happened if anything went wrong.

Implemented in juce::iOSAudioIODevice.

◆ getName()

const String& juce::AudioIODevice::getName ( ) const

inlinenoexcept

Returns the device's name, (as set in the constructor).

◆ getOutputChannelNames()

virtual StringArray juce::AudioIODevice::getOutputChannelNames ( )

pure virtual

Returns the names of all the available output channels on this device.

To find out which of these are currently in use, call getActiveOutputChannels().

Implemented in juce::iOSAudioIODevice.

◆ getOutputLatencyInSamples()

virtual int juce::AudioIODevice::getOutputLatencyInSamples ( )

pure virtual

Returns the device's output latency.

This is the delay in samples between a callback getting a block of data, and that data actually getting played.

Implemented in juce::iOSAudioIODevice.

◆ getTypeName()

const String& juce::AudioIODevice::getTypeName ( ) const

inlinenoexcept

Returns the type of the device.

E.g. "CoreAudio", "ASIO", etc. - this comes from the AudioIODeviceType that created it.

References juce::BlocksProtocol::deviceName.

◆ getXRunCount()

virtual int juce::AudioIODevice::getXRunCount ( ) const

virtualnoexcept

Returns the number of under- or over runs reported by the OS since playback/recording has started.

This number may be different than determining the Xrun count manually (by measuring the time spent in the audio callback) as the OS may be doing some buffering internally - especially on mobile devices.

Returns -1 if playback/recording has not started yet or if getting the underrun count is not supported for this device (Android SDK 23 and lower).

Reimplemented in juce::iOSAudioIODevice.

◆ hasControlPanel()

virtual bool juce::AudioIODevice::hasControlPanel ( ) const

virtual

True if this device can show a pop-up control panel for editing its settings.

This is generally just true of ASIO devices. If true, you can call showControlPanel() to display it.

◆ isOpen()

virtual bool juce::AudioIODevice::isOpen ( )

pure virtual

Returns true if the device is still open.

A device might spontaneously close itself if something goes wrong, so this checks if it's still open.

Implemented in juce::iOSAudioIODevice.

◆ isPlaying()

virtual bool juce::AudioIODevice::isPlaying ( )

pure virtual

Returns true if the device is still calling back.

The device might mysteriously stop, so this checks whether it's still playing.

Implemented in juce::iOSAudioIODevice.

◆ open()

virtual String juce::AudioIODevice::open	(	const BigInteger &	inputChannels,
		const BigInteger &	outputChannels,
		double	sampleRate,
		int	bufferSizeSamples
	)

pure virtual

Tries to open the device ready to play.

Parameters

inputChannels	a BigInteger in which a set bit indicates that the corresponding input channel should be enabled
outputChannels	a BigInteger in which a set bit indicates that the corresponding output channel should be enabled
sampleRate	the sample rate to try to use - to find out which rates are available, see getAvailableSampleRates()
bufferSizeSamples	the size of i/o buffer to use - to find out the available buffer sizes, see getAvailableBufferSizes()

Returns: an error description if there's a problem, or an empty string if it succeeds in opening the device

See also: close

Implemented in juce::iOSAudioIODevice.

◆ setAudioPreprocessingEnabled()

virtual bool juce::AudioIODevice::setAudioPreprocessingEnabled ( bool shouldBeEnabled )

virtual

On devices which support it, this allows automatic gain control or other mic processing to be disabled.

If the device doesn't support this operation, it'll return false.

Reimplemented in juce::iOSAudioIODevice.

◆ showControlPanel()

virtual bool juce::AudioIODevice::showControlPanel ( )

virtual

Shows a device-specific control panel if there is one.

This should only be called for devices which return true from hasControlPanel().

◆ start()

virtual void juce::AudioIODevice::start ( AudioIODeviceCallback * callback )

pure virtual

Starts the device actually playing.

This must be called after the device has been opened.

Parameters

callback the callback to use for streaming the data.

See also: AudioIODeviceCallback, open

Implemented in juce::iOSAudioIODevice.

◆ stop()

virtual void juce::AudioIODevice::stop ( )

pure virtual

Stops the device playing.

Once a device has been started, this will stop it. Any pending calls to the callback class will be flushed before this method returns.

Implemented in juce::iOSAudioIODevice.

Member Data Documentation

◆ name

String juce::AudioIODevice::name

protected

◆ typeName

String juce::AudioIODevice::typeName

protected

The documentation for this class was generated from the following file:

juce_AudioIODevice.h

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ~AudioIODevice()

◆ AudioIODevice()

Member Function Documentation

◆ close()

◆ getActiveInputChannels()

◆ getActiveOutputChannels()

◆ getAvailableBufferSizes()

◆ getAvailableSampleRates()

◆ getCurrentBitDepth()

◆ getCurrentBufferSizeSamples()

◆ getCurrentSampleRate()

◆ getDefaultBufferSize()

◆ getInputChannelNames()

◆ getInputLatencyInSamples()

◆ getLastError()

◆ getName()

◆ getOutputChannelNames()

◆ getOutputLatencyInSamples()

◆ getTypeName()

◆ getXRunCount()

◆ hasControlPanel()

◆ isOpen()

◆ isPlaying()

◆ open()

◆ setAudioPreprocessingEnabled()

◆ showControlPanel()

◆ start()

◆ stop()

Member Data Documentation

◆ name

◆ typeName