Wrapper for ALSA device that use file descriptor to communicate. More...

#include <MpAlsa.h>

Inheritance diagram for MpAlsa:

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Collaboration diagram for MpAlsa:

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Public Member Functions

Creators

MpAlsa ()

Constructor. More...

~MpAlsa ()

Destructor. More...

Manipulators

OsStatus setInputDevice (MpidAlsa *pIDD)

Connect MpidAlsa class driver. More...

OsStatus setOutputDevice (MpodAlsa *pODD)

Connect MpodAlsa class driver. More...

OsStatus freeInputDevice ()

Disconnect Input driver. More...

OsStatus freeOutputDevice ()

Disconnect Output driver. More...

OsStatus attachReader ()

Enable input device. More...

OsStatus attachWriter ()

Enable output device. More...

OsStatus detachReader ()

Disable input device. More...

OsStatus detachWriter ()

Disable output device. More...

Inquiry

Parameters

deviceNames	output - list of device names
capture	input - true - get input device names false - get output device names

Returns: count of device names

UtlBoolean isDeviceValid ()

Inquire if the device is valid. More...

UtlBoolean isReaderAttached ()

Inquire if the input device is connected. More...

UtlBoolean isWriterAttached ()

Inquire if the output device is connected. More...

UtlBoolean isDevCapBatch ()

UtlBoolean isDevCapDuplex ()

UtlBoolean isDevCapMmap ()

UtlBoolean isDevCapTrigger ()

UtlBoolean isNotUsed ()

Inquire if ALSA device is free, i.e. neither input nor output is connected. More...

Static Public Member Functions
Accessors
static int	getDeviceNames (UtlContainer &deviceNames, bool capture)
	get list of available input or output Alsa device names More...

Protected Member Functions
OsStatus	initDevice (const char *devname, int samplesPerSecond)
	Pre initializations for ALSA device. More...

OsStatus	initDeviceFinal (unsigned samplesPerSec, unsigned samplerPerFrame)
	Final initializations for ALSA device. More...

OsStatus	setSampleRate (unsigned samplesPerSec, unsigned samplerPerFrame)
	Because ALSA device works in duplex mode we must ensure that input and output driver use one sample rate and perfrom final init. More...

OsStatus	doInput (char *buffer, int size)
	Perform input operation of ALSA device. More...

OsStatus	doOutput (const char *buffer, int size)
	Perform output operation of ALSA device. More...

OsStatus	doInputRs (MpAudioSample *buffer, unsigned size)
	Perform input operation of ALSA device with siutable resampler. More...

OsStatus	doOutputRs (const MpAudioSample *buffer, unsigned size)
	Perform output operation of ALSA device with siutable resampler. More...

void	noMoreNeeded ()
	Deinitialization and freeing sequences. More...

void	soundIoThread ()
	Thread subroutine. More...

Protected Attributes
UtlBoolean	mbReadCap
	Device is able to play audio. More...

UtlBoolean	mbWriteCap
	Device is able to capture audio. More...

MpidAlsa *	mReader
	Input driver. More...

MpodAlsa *	mWriter
	Output driver. More...

int	mDeviceCap
	Device capabilities. More...

volatile UtlBoolean	mStReader
	Input device is enabled. More...

volatile UtlBoolean	mStWriter
	Output device is enabled. More...

volatile UtlBoolean	mStShutdown
	Thread exit flag. More...

volatile UtlBoolean	mModeChanged
	IO settings has changed. More...

unsigned	mUsedSamplesPerSec
	Used samples rate either for IO. More...

unsigned	mUsedSamplesPerFrame
	Used frame size for IO. More...

MpAudioSample *	mResamplerBuffer
	Buffer for conversions. More...

UtlBoolean	mStereoOps
	Use stereo output. More...

pthread_t	mIoThread
	Internal IO thread. More...

sem_t	mSleepSem
	Control IO thread sleeping. More...

sem_t	mSignalSem
	Use for parameters synchronization. More...

snd_pcm_t *	pPcmOut

snd_pcm_t *	pPcmIn

int	writeBufSize

int	readBufSize

Private Member Functions
void	threadIoStatusChanged ()

void	threadWakeUp ()

void	threadKill ()

UtlBoolean	alsaSetTrigger (bool turnOn)

UtlBoolean	alsaReset ()

int	alsaSetupPcmDevice (const char *devname, bool capture, unsigned &suggestedRate)

int	alsaSetupWarning (const char devname, int err, bool cap, const char pLogString)

Static Private Member Functions
static void *	soundCardIoWrapper (void *arg)
	Thread subroutine. More...

Friends
class	MpidAlsa

class	MpodAlsa

Detailed Description

Wrapper for ALSA device that use file descriptor to communicate.

Constructor & Destructor Documentation

MpAlsa ( )

Constructor.

~MpAlsa ( )

Destructor.

Member Function Documentation

OsStatus setInputDevice ( MpidAlsa * pIDD )

Connect MpidAlsa class driver.

OsStatus setOutputDevice ( MpodAlsa * pODD )

Connect MpodAlsa class driver.

OsStatus freeInputDevice ( )

Disconnect Input driver.

OsStatus freeOutputDevice ( )

Disconnect Output driver.

OsStatus attachReader ( )

Enable input device.

OsStatus attachWriter ( )

Enable output device.

OsStatus detachReader ( )

Disable input device.

OsStatus detachWriter ( )

Disable output device.

static int getDeviceNames	(	UtlContainer &	deviceNames,
		bool	capture
	)

static

get list of available input or output Alsa device names

UtlBoolean isDeviceValid ( )

inline

Inquire if the device is valid.

UtlBoolean isReaderAttached ( )

inline

Inquire if the input device is connected.

UtlBoolean isWriterAttached ( )

inline

Inquire if the output device is connected.

UtlBoolean isDevCapBatch ( )

inline

UtlBoolean isDevCapDuplex ( )

inline

UtlBoolean isDevCapMmap ( )

inline

UtlBoolean isDevCapTrigger ( )

inline

UtlBoolean isNotUsed ( )

inline

Inquire if ALSA device is free, i.e. neither input nor output is connected.

OsStatus initDevice	(	const char *	devname,
		int	samplesPerSecond
	)

protected

Pre initializations for ALSA device.

OsStatus initDeviceFinal	(	unsigned	samplesPerSec,
		unsigned	samplerPerFrame
	)

protected

Final initializations for ALSA device.

OsStatus setSampleRate	(	unsigned	samplesPerSec,
		unsigned	samplerPerFrame
	)

protected

Because ALSA device works in duplex mode we must ensure that input and output driver use one sample rate and perfrom final init.

OsStatus doInput	(	char *	buffer,
		int	size
	)

protected

Perform input operation of ALSA device.

OsStatus doOutput	(	const char *	buffer,
		int	size
	)

protected

Perform output operation of ALSA device.

OsStatus doInputRs	(	MpAudioSample *	buffer,
		unsigned	size
	)

protected

Perform input operation of ALSA device with siutable resampler.

OsStatus doOutputRs	(	const MpAudioSample *	buffer,
		unsigned	size
	)

protected

Perform output operation of ALSA device with siutable resampler.

void noMoreNeeded ( )

protected

Deinitialization and freeing sequences.

void soundIoThread ( )

protected

Thread subroutine.

void threadIoStatusChanged ( )

private

void threadWakeUp ( )

private

void threadKill ( )

private

UtlBoolean alsaSetTrigger ( bool turnOn )

private

UtlBoolean alsaReset ( )

private

static void* soundCardIoWrapper ( void * arg )

staticprivate

Thread subroutine.

int alsaSetupPcmDevice	(	const char *	devname,
		bool	capture,
		unsigned &	suggestedRate
	)

private

int alsaSetupWarning	(	const char *	devname,
		int	err,
		bool	cap,
		const char *	pLogString
	)

private

Friends And Related Function Documentation

friend class MpidAlsa

friend

friend class MpodAlsa

friend

Member Data Documentation

UtlBoolean mbReadCap

protected

Device is able to play audio.

UtlBoolean mbWriteCap

protected

Device is able to capture audio.

MpidAlsa* mReader

protected

Input driver.

MpodAlsa* mWriter

protected

Output driver.

int mDeviceCap

protected

Device capabilities.

volatile UtlBoolean mStReader

protected

Input device is enabled.

volatile UtlBoolean mStWriter

protected

Output device is enabled.

volatile UtlBoolean mStShutdown

protected

Thread exit flag.

volatile UtlBoolean mModeChanged

protected

IO settings has changed.

unsigned mUsedSamplesPerSec

protected

Used samples rate either for IO.

unsigned mUsedSamplesPerFrame

protected

Used frame size for IO.

MpAudioSample* mResamplerBuffer

protected

Buffer for conversions.

UtlBoolean mStereoOps

protected

Use stereo output.

pthread_t mIoThread

protected

Internal IO thread.

sem_t mSleepSem

protected

Control IO thread sleeping.

sem_t mSignalSem

protected

Use for parameters synchronization.

snd_pcm_t* pPcmOut

protected

snd_pcm_t* pPcmIn

protected

int writeBufSize

protected

int readBufSize

protected

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Static Private Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation