Collapse all Symbian^3 Product Developer Library

CBTAudioStreamer Class Reference

class CBTAudioStreamer : public CBase

BT Audio Streamer class.

This class implements the audio streaming over A2DP. It acts as an interface between the controller, BT Audio Adaptation and RTP API. It uses helper class CBTAudioStreamSender to handle the frame contruction and sending.

btaudiostreamer.lib

Since: S60 v3.1

Inherits from

CBTAudioStreamer
- CBase

Public Member Functions
	~CBTAudioStreamer()
IMPORT_C CBTAudioStreamer *	NewL()
void	NotifyBufferSent(const TDesC8 &)
void	NotifyErrorSending(const TDesC8 &)
TInt	Receive(const TDesC8 &)
TInt	Receive(const TDesC8 &, TTimeIntervalMicroSeconds)
IMPORT_C TInt	SetNewFrameLength(const TUint, const TUint)
IMPORT_C void	StartL(RSocket &, const TUint, CBTAudioStreamInputBase *, const TUint)
IMPORT_C void	Stop()

Private Member Functions
	CBTAudioStreamer()
void	ConstructL()

Inherited Functions
	CBase::CBase()
	CBase::Delete(CBase *)
	CBase::Extension_(TUint,TAny &,TAny )
	CBase::operator new(TUint)
	CBase::operator new(TUint,TAny *)
	CBase::operator new(TUint,TLeave)
	CBase::operator new(TUint,TLeave,TUint)
	CBase::operator new(TUint,TUint)
	CBase::~CBase()

Private Attributes
CBTAudioStreamInputBase *	iAudioInput
RRtpSession	iRtpSession
CBTAudioStreamSender *	iSender
TBool	iStarted

Constructor & Destructor Documentation

CBTAudioStreamer()

CBTAudioStreamer

(

)

[private]

~CBTAudioStreamer()

~CBTAudioStreamer

(

)

[virtual]

Member Functions Documentation

ConstructL()

void

ConstructL

(

)

[private]

NewL()

IMPORT_C CBTAudioStreamer *

NewL

(

)

[static]

NotifyBufferSent(const TDesC8 &)

void

NotifyBufferSent

(

const TDesC8 &

aBuffer

)

From MBTAudioStreamSenderObserver. This method is used for reporting that the referred buffer has been sent. This tells the data producer that we're ready to receive more data.

Since: S60 v3.1

Parameters

const TDesC8 & aBuffer

refers to the original bufffer that we received in Receive method.

NotifyErrorSending(const TDesC8 &)

void

NotifyErrorSending

(

const TDesC8 &

aBuffer

)

From MBTAudioStreamSenderObserver. This method is used for reporting that the buffer wasn't sent because of an error. This method then informs the error observer class.

Since: S60 v3.1

Parameters

const TDesC8 & aBuffer

refers to the original bufffer that we received in Receive method.

Receive(const TDesC8 &)

TInt

Receive

(

const TDesC8 &

aBuffer

)

From MBTAudioStreamObserver. This method receives data from the data producer.

Since: S60 v3.1

Parameters

const TDesC8 & aBuffer

contains the audio data frames.

Receive(const TDesC8 &, TTimeIntervalMicroSeconds)

TInt	Receive	(	const TDesC8 &	aBuffer,
			TTimeIntervalMicroSeconds	aTimestamp
		)

From MBTAudioStreamObserver. This method receives data and timestamps from the data producer.

Since: S60 v3.1

Parameters

const TDesC8 & aBuffer	contains the audio data frames.
TTimeIntervalMicroSeconds aTimestamp	The timestamp of the audio data frames. 34 minutes max. interval should not be a problem to us.

SetNewFrameLength(const TUint, const TUint)

IMPORT_C TInt	SetNewFrameLength	(	const TUint	aFrameLength,
			const TUint	aTargetBitrate
		)

A method for preparing the BT Audio Streamer for incoming data.

Since: S60 v3.1

Parameters

const TUint aFrameLength	Length of a single audio data frame, needed for calculating the send packet size.
const TUint aTargetBitrate

StartL(RSocket &, const TUint, CBTAudioStreamInputBase *, const TUint)

IMPORT_C void	StartL	(	RSocket &	aSocket,
			const TUint	aFrameLength,
			CBTAudioStreamInputBase *	aAudioInput,
			const TUint	aTargetBitrate
		)

A method for preparing the BT Audio Streamer for incoming data.

Since: S60 v3.1

Parameters

RSocket & aSocket	Bluetooth socket instance, needed for getting the RTP sending class instance.
const TUint aFrameLength	Length of a single audio data frame, needed for calculating the send packet size.
CBTAudioStreamInputBase * aAudioInput	The API where the data is received and where the sending of packets will be confirmed.
const TUint aTargetBitrate

Stop()

IMPORT_C void

Stop

(

)

A method for cleaning up the BT Audio Streamer after streaming data.

Since: S60 v3.1

Member Data Documentation

CBTAudioStreamInputBase * iAudioInput

CBTAudioStreamInputBase *

iAudioInput

[private]

This stores a pointer to the audio input interface. After a buffer has been processed, this interface must be informed.

RRtpSession iRtpSession

RRtpSession

iRtpSession

[private]

RTP session object that is needed for sending RTP frames.

CBTAudioStreamSender * iSender

CBTAudioStreamSender *

iSender

[private]

This points to a helper class that handles the sending of a frame. Own.

TBool iStarted

TBool

iStarted

[private]

This stores the state of the streamer.