org.jitsi.impl.neomedia.conference

Class AudioMixingPushBufferDataSource

java.lang.Object

javax.media.protocol.DataSource

javax.media.protocol.PushBufferDataSource

org.jitsi.impl.neomedia.conference.AudioMixingPushBufferDataSource

All Implemented Interfaces:

javax.media.Controls, javax.media.Duration, javax.media.protocol.CaptureDevice, InbandDTMFDataSource, MuteDataSource

public class AudioMixingPushBufferDataSource
extends javax.media.protocol.PushBufferDataSource
implements javax.media.protocol.CaptureDevice, MuteDataSource, InbandDTMFDataSource

Represents a PushBufferDataSource which provides a single PushBufferStream containing the result of the audio mixing of DataSources.

Author:

Lyubomir Marinov

Field Summary

Fields inherited from interface javax.media.Duration

DURATION_UNBOUNDED, DURATION_UNKNOWN

Constructor Summary

Constructors

Constructor and Description
AudioMixingPushBufferDataSource(AudioMixer audioMixer) Initializes a new AudioMixingPushBufferDataSource instance which gives access to the result of the audio mixing performed by a specific AudioMixer.

Method Summary

Modifier and Type	Method and Description
void	addDTMF(DTMFInbandTone tone) Adds a new inband DTMF tone to send.
void	addInDataSource(javax.media.protocol.DataSource inDataSource) Adds a new input DataSource to be mixed by the associated AudioMixer of this instance and to not have its audio contributions included in the mixing output represented by this DataSource.
void	connect() Implements DataSource.connect().
void	disconnect() Implements DataSource.disconnect().
javax.media.CaptureDeviceInfo	getCaptureDeviceInfo() Implements CaptureDevice.getCaptureDeviceInfo().
String	getContentType() Implements DataSource.getContentType().
Object	getControl(String controlType) Implements Controls.getControl(String).
Object[]	getControls() Implements Controls.getControls().
javax.media.Time	getDuration() Implements Duration.getDuration().
javax.media.control.FormatControl[]	getFormatControls() Implements CaptureDevice.getFormatControls().
short[]	getNextToneSignal(double sampleRate, int sampleSizeInBits) Gets the next inband DTMF tone signal.
javax.media.protocol.PushBufferStream[]	getStreams() Implements PushBufferDataSource.getStreams().
boolean	isMute() Determines whether this DataSource is mute.
boolean	isSendingDTMF() Determines whether this DataSource sends a DTMF tone.
void	setMute(boolean mute) Sets the mute state of this DataSource.
void	start() Implements DataSource.start().
void	stop() Implements DataSource.stop().
void	updateInDataSource(javax.media.protocol.DataSource inDataSource) The input DataSource has been updated.

Methods inherited from class javax.media.protocol.DataSource

getLocator, initCheck, setLocator

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AudioMixingPushBufferDataSource

public AudioMixingPushBufferDataSource(AudioMixer audioMixer)

Initializes a new AudioMixingPushBufferDataSource instance which gives access to the result of the audio mixing performed by a specific AudioMixer.

Parameters:

audioMixer - the AudioMixer performing audio mixing, managing the input DataSources and pushing the data of the new output PushBufferDataSource

Method Detail

addDTMF

public void addDTMF(DTMFInbandTone tone)

Adds a new inband DTMF tone to send.

Specified by:

addDTMF in interface InbandDTMFDataSource

Parameters:

tone - the DTMF tone to send.

addInDataSource

public void addInDataSource(javax.media.protocol.DataSource inDataSource)

Adds a new input DataSource to be mixed by the associated AudioMixer of this instance and to not have its audio contributions included in the mixing output represented by this DataSource.

Parameters:

inDataSource - a DataSource to be added for mixing to the AudioMixer associate with this instance and to not have its audio contributions included in the mixing output represented by this DataSource

connect

public void connect()
             throws IOException

Implements DataSource.connect(). Lets the AudioMixer know that one of its output PushBufferDataSources has been connected and marks this DataSource as connected.

Specified by:

connect in interface javax.media.protocol.CaptureDevice

Specified by:

connect in class javax.media.protocol.DataSource

Throws:

IOException - if the AudioMixer fails to connect

disconnect

public void disconnect()

Implements DataSource.disconnect(). Marks this DataSource as disconnected and notifies the AudioMixer that one of its output PushBufferDataSources has been disconnected.

Specified by:

disconnect in interface javax.media.protocol.CaptureDevice

Specified by:

disconnect in class javax.media.protocol.DataSource

getCaptureDeviceInfo

public javax.media.CaptureDeviceInfo getCaptureDeviceInfo()

Implements CaptureDevice.getCaptureDeviceInfo(). Delegates to the associated AudioMixer because it knows which CaptureDevice is being wrapped.

Specified by:

getCaptureDeviceInfo in interface javax.media.protocol.CaptureDevice

Returns:

the CaptureDeviceInfo of the CaptureDevice of the AudioMixer

getContentType

public String getContentType()

Implements DataSource.getContentType(). Delegates to the associated AudioMixer because it manages the inputs and knows their characteristics.

Specified by:

getContentType in class javax.media.protocol.DataSource

Returns:

a String value which represents the type of the content being made available by this DataSource i.e. the associated AudioMixer

getControl

public Object getControl(String controlType)

Implements Controls.getControl(String).

Specified by:

getControl in interface javax.media.Controls

Parameters:

controlType - a String value which names the type of the control of this instance to be retrieved

Returns:

an Object which represents the control of this instance with the specified type if such a control is available; otherwise, null

getControls

public Object[] getControls()

Implements Controls.getControls(). Gets an array of Objects which represent the controls available for this DataSource.

Specified by:

getControls in interface javax.media.Controls

Returns:

an array of Objects which represent the controls available for this DataSource

getDuration

public javax.media.Time getDuration()

Implements Duration.getDuration(). Delegates to the associated AudioMixer because it manages the inputs and knows their characteristics.

Specified by:

getDuration in interface javax.media.Duration

Returns:

a Time value which represents the duration of the media being made available through this DataSource

getFormatControls

public javax.media.control.FormatControl[] getFormatControls()

Implements CaptureDevice.getFormatControls(). Delegates to the associated AudioMixer because it knows which CaptureDevice is being wrapped.

Specified by:

getFormatControls in interface javax.media.protocol.CaptureDevice

Returns:

an array of FormatControls of the CaptureDevice of the associated AudioMixer

getNextToneSignal

public short[] getNextToneSignal(double sampleRate,
                                 int sampleSizeInBits)

Gets the next inband DTMF tone signal.

Parameters:

sampleRate - The sampling frequency (codec clock rate) in Hz of the stream which will encapsulate this signal.

sampleSizeInBits - The size of each sample (8 for a byte, 16 for a short and 32 for an int)

Returns:

The data array containing the DTMF signal.

getStreams

public javax.media.protocol.PushBufferStream[] getStreams()

Implements PushBufferDataSource.getStreams(). Gets a PushBufferStream which reads data from the associated AudioMixer and mixes its inputs.

Specified by:

getStreams in class javax.media.protocol.PushBufferDataSource

Returns:

an array with a single PushBufferStream which reads data from the associated AudioMixer and mixes its inputs if this DataSource is connected; otherwise, an empty array

isMute

public boolean isMute()

Determines whether this DataSource is mute.

Specified by:

isMute in interface MuteDataSource

Returns:

true if this DataSource is mute; otherwise, false

isSendingDTMF

public boolean isSendingDTMF()

Determines whether this DataSource sends a DTMF tone.

Returns:

true if this DataSource is sending a DTMF tone; otherwise, false.

setMute

public void setMute(boolean mute)

Sets the mute state of this DataSource.

Specified by:

setMute in interface MuteDataSource

Parameters:

mute - true to mute this DataSource; otherwise, false

start

public void start()
           throws IOException

Implements DataSource.start(). Starts the output PushBufferStream of this DataSource (if it exists) and notifies the AudioMixer that one of its output PushBufferDataSources has been started.

Specified by:

start in interface javax.media.protocol.CaptureDevice

Specified by:

start in class javax.media.protocol.DataSource

Throws:

IOException - if anything wrong happens while starting the output PushBufferStream of this DataSource

stop

public void stop()
          throws IOException

Implements DataSource.stop(). Notifies the AudioMixer that one of its output PushBufferDataSources has been stopped and stops the output PushBufferStream of this DataSource (if it exists).

Specified by:

stop in interface javax.media.protocol.CaptureDevice

Specified by:

stop in class javax.media.protocol.DataSource

Throws:

IOException - if anything wrong happens while stopping the output PushBufferStream of this DataSource

updateInDataSource

public void updateInDataSource(javax.media.protocol.DataSource inDataSource)

The input DataSource has been updated.

Parameters:

inDataSource - the DataSource that was updated.