Hardware Dependant Interface

Macros
#define	SND_HWDEP_DLSYM_VERSION   _dlsym_hwdep_001
#define	SND_HWDEP_OPEN_READ   (O_RDONLY)
#define	SND_HWDEP_OPEN_WRITE   (O_WRONLY)
#define	SND_HWDEP_OPEN_DUPLEX   (O_RDWR)
#define	SND_HWDEP_OPEN_NONBLOCK   (O_NONBLOCK)
#define	snd_hwdep_info_alloca(ptr)   __snd_alloca(ptr, snd_hwdep_info)
#define	snd_hwdep_dsp_status_alloca(ptr)   __snd_alloca(ptr, snd_hwdep_dsp_status)
#define	snd_hwdep_dsp_image_alloca(ptr)   __snd_alloca(ptr, snd_hwdep_dsp_image)

Typedefs
typedef struct _snd_hwdep_info	snd_hwdep_info_t
typedef struct _snd_hwdep_dsp_status	snd_hwdep_dsp_status_t
typedef struct _snd_hwdep_dsp_image	snd_hwdep_dsp_image_t
typedef struct _snd_hwdep	snd_hwdep_t

Enumerations
enum	snd_hwdep_iface_t {   SND_HWDEP_IFACE_OPL2 = 0 , SND_HWDEP_IFACE_OPL3 , SND_HWDEP_IFACE_OPL4 , SND_HWDEP_IFACE_SB16CSP ,   SND_HWDEP_IFACE_EMU10K1 , SND_HWDEP_IFACE_YSS225 , SND_HWDEP_IFACE_ICS2115 , SND_HWDEP_IFACE_SSCAPE ,   SND_HWDEP_IFACE_VX , SND_HWDEP_IFACE_MIXART , SND_HWDEP_IFACE_USX2Y , SND_HWDEP_IFACE_EMUX_WAVETABLE ,   SND_HWDEP_IFACE_BLUETOOTH , SND_HWDEP_IFACE_USX2Y_PCM , SND_HWDEP_IFACE_PCXHR , SND_HWDEP_IFACE_SB_RC ,   SND_HWDEP_IFACE_HDA , SND_HWDEP_IFACE_USB_STREAM , SND_HWDEP_IFACE_FW_DICE , SND_HWDEP_IFACE_FW_FIREWORKS ,   SND_HWDEP_IFACE_FW_BEBOB , SND_HWDEP_IFACE_FW_OXFW , SND_HWDEP_IFACE_FW_DIGI00X , SND_HWDEP_IFACE_FW_TASCAM ,   SND_HWDEP_IFACE_LINE6 , SND_HWDEP_IFACE_FW_MOTU , SND_HWDEP_IFACE_FW_FIREFACE , SND_HWDEP_IFACE_LAST = SND_HWDEP_IFACE_FW_FIREFACE }
enum	snd_hwdep_type_t { SND_HWDEP_TYPE_HW , SND_HWDEP_TYPE_SHM , SND_HWDEP_TYPE_INET }

Functions
int	snd_hwdep_open (snd_hwdep_t **hwdep, const char *name, int mode)
	Opens a new connection to the HwDep interface. More...
int	snd_hwdep_close (snd_hwdep_t *hwdep)
	close HwDep handle More...
int	snd_hwdep_poll_descriptors (snd_hwdep_t *hwdep, struct pollfd *pfds, unsigned int space)
	get poll descriptors More...
int	snd_hwdep_poll_descriptors_count (snd_hwdep_t *hwdep)
	get count of poll descriptors for HwDep handle More...
int	snd_hwdep_poll_descriptors_revents (snd_hwdep_t *hwdep, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)
	get returned events from poll descriptors More...
int	snd_hwdep_nonblock (snd_hwdep_t *hwdep, int nonblock)
	set nonblock mode More...
int	snd_hwdep_info (snd_hwdep_t *hwdep, snd_hwdep_info_t *info)
	get information about HwDep handle More...
int	snd_hwdep_dsp_status (snd_hwdep_t *hwdep, snd_hwdep_dsp_status_t *status)
	get the DSP status information More...
int	snd_hwdep_dsp_load (snd_hwdep_t *hwdep, snd_hwdep_dsp_image_t *block)
	load the DSP block More...
int	snd_hwdep_ioctl (snd_hwdep_t *hwdep, unsigned int request, void *arg)
	do hardware dependent ioctl More...
ssize_t	snd_hwdep_write (snd_hwdep_t *hwdep, const void *buffer, size_t size)
	write bytes using HwDep handle More...
ssize_t	snd_hwdep_read (snd_hwdep_t *hwdep, void *buffer, size_t size)
	read bytes using HwDep handle More...
size_t	snd_hwdep_info_sizeof (void)
	get size of the snd_hwdep_info_t structure in bytes More...
int	snd_hwdep_info_malloc (snd_hwdep_info_t **ptr)
	allocate a new snd_hwdep_info_t structure More...
void	snd_hwdep_info_free (snd_hwdep_info_t *obj)
	frees the snd_hwdep_info_t structure More...
void	snd_hwdep_info_copy (snd_hwdep_info_t *dst, const snd_hwdep_info_t *src)
	copy one snd_hwdep_info_t structure to another More...
unsigned int	snd_hwdep_info_get_device (const snd_hwdep_info_t *obj)
	get hwdep device number More...
int	snd_hwdep_info_get_card (const snd_hwdep_info_t *obj)
	get hwdep card number More...
const char *	snd_hwdep_info_get_id (const snd_hwdep_info_t *obj)
	get hwdep driver identifier More...
const char *	snd_hwdep_info_get_name (const snd_hwdep_info_t *obj)
	get hwdep driver name More...
snd_hwdep_iface_t	snd_hwdep_info_get_iface (const snd_hwdep_info_t *obj)
	get hwdep protocol interface More...
void	snd_hwdep_info_set_device (snd_hwdep_info_t *obj, unsigned int val)
	set hwdep device number More...
size_t	snd_hwdep_dsp_status_sizeof (void)
	get size of the snd_hwdep_dsp_status_t structure in bytes More...
int	snd_hwdep_dsp_status_malloc (snd_hwdep_dsp_status_t **ptr)
	allocate a new snd_hwdep_dsp_status_t structure More...
void	snd_hwdep_dsp_status_free (snd_hwdep_dsp_status_t *obj)
	frees the snd_hwdep_dsp_status_t structure More...
void	snd_hwdep_dsp_status_copy (snd_hwdep_dsp_status_t *dst, const snd_hwdep_dsp_status_t *src)
	copy one snd_hwdep_dsp_status_t structure to another More...
unsigned int	snd_hwdep_dsp_status_get_version (const snd_hwdep_dsp_status_t *obj)
	get the driver version of dsp loader More...
const char *	snd_hwdep_dsp_status_get_id (const snd_hwdep_dsp_status_t *obj)
	get the driver id of dsp loader More...
unsigned int	snd_hwdep_dsp_status_get_num_dsps (const snd_hwdep_dsp_status_t *obj)
	get number of dsp blocks More...
unsigned int	snd_hwdep_dsp_status_get_dsp_loaded (const snd_hwdep_dsp_status_t *obj)
	get the bit flags of the loaded dsp blocks More...
unsigned int	snd_hwdep_dsp_status_get_chip_ready (const snd_hwdep_dsp_status_t *obj)
	get the chip status of dsp loader More...
size_t	snd_hwdep_dsp_image_sizeof (void)
	get size of the snd_hwdep_dsp_image_t structure in bytes More...
int	snd_hwdep_dsp_image_malloc (snd_hwdep_dsp_image_t **ptr)
	allocate a new snd_hwdep_dsp_image_t structure More...
void	snd_hwdep_dsp_image_free (snd_hwdep_dsp_image_t *obj)
	frees the snd_hwdep_dsp_image_t structure More...
void	snd_hwdep_dsp_image_copy (snd_hwdep_dsp_image_t *dst, const snd_hwdep_dsp_image_t *src)
	copy one snd_hwdep_dsp_image_t structure to another More...
unsigned int	snd_hwdep_dsp_image_get_index (const snd_hwdep_dsp_image_t *obj)
	get the DSP block index More...
const char *	snd_hwdep_dsp_image_get_name (const snd_hwdep_dsp_image_t *obj)
	get the name of the DSP block More...
const void *	snd_hwdep_dsp_image_get_image (const snd_hwdep_dsp_image_t *obj)
	get the image pointer of the DSP block More...
size_t	snd_hwdep_dsp_image_get_length (const snd_hwdep_dsp_image_t *obj)
	get the length of the DSP block More...
void	snd_hwdep_dsp_image_set_index (snd_hwdep_dsp_image_t *obj, unsigned int _index)
	set the DSP block index More...
void	snd_hwdep_dsp_image_set_name (snd_hwdep_dsp_image_t *obj, const char *name)
	set the name of the DSP block More...
void	snd_hwdep_dsp_image_set_image (snd_hwdep_dsp_image_t *obj, void *buffer)
	set the DSP block image pointer More...
void	snd_hwdep_dsp_image_set_length (snd_hwdep_dsp_image_t *obj, size_t length)
	set the DSP block length More...

Detailed Description

The Hardware Dependant Interface.

Macro Definition Documentation

SND_HWDEP_DLSYM_VERSION

#define SND_HWDEP_DLSYM_VERSION   _dlsym_hwdep_001

dlsym version for interface entry callback

snd_hwdep_dsp_image_alloca

#define snd_hwdep_dsp_image_alloca

(

ptr

)

__snd_alloca(ptr, snd_hwdep_dsp_image)

allocate snd_hwdep_dsp_image_t container on stack

snd_hwdep_dsp_status_alloca

#define snd_hwdep_dsp_status_alloca

(

ptr

)

__snd_alloca(ptr, snd_hwdep_dsp_status)

allocate snd_hwdep_dsp_status_t container on stack

snd_hwdep_info_alloca

#define snd_hwdep_info_alloca

(

ptr

)

__snd_alloca(ptr, snd_hwdep_info)

allocate snd_hwdep_info_t container on stack

SND_HWDEP_OPEN_DUPLEX

#define SND_HWDEP_OPEN_DUPLEX   (O_RDWR)

open for reading and writing

SND_HWDEP_OPEN_NONBLOCK

#define SND_HWDEP_OPEN_NONBLOCK   (O_NONBLOCK)

open mode flag: open in nonblock mode

SND_HWDEP_OPEN_READ

#define SND_HWDEP_OPEN_READ   (O_RDONLY)

open for reading

SND_HWDEP_OPEN_WRITE

#define SND_HWDEP_OPEN_WRITE   (O_WRONLY)

open for writing

Typedef Documentation

snd_hwdep_dsp_image_t

typedef struct _snd_hwdep_dsp_image snd_hwdep_dsp_image_t

HwDep DSP image container

snd_hwdep_dsp_status_t

typedef struct _snd_hwdep_dsp_status snd_hwdep_dsp_status_t

HwDep DSP status container

snd_hwdep_info_t

typedef struct _snd_hwdep_info snd_hwdep_info_t

HwDep information container

snd_hwdep_t

typedef struct _snd_hwdep snd_hwdep_t

HwDep handle

Enumeration Type Documentation

snd_hwdep_iface_t

enum snd_hwdep_iface_t

HwDep interface

Enumerator
SND_HWDEP_IFACE_OPL2	OPL2 raw driver
SND_HWDEP_IFACE_OPL3	OPL3 raw driver
SND_HWDEP_IFACE_OPL4	OPL4 raw driver
SND_HWDEP_IFACE_SB16CSP	SB16CSP driver
SND_HWDEP_IFACE_EMU10K1	EMU10K1 driver
SND_HWDEP_IFACE_YSS225	YSS225 driver
SND_HWDEP_IFACE_ICS2115	ICS2115 driver
SND_HWDEP_IFACE_SSCAPE	Ensoniq SoundScape ISA card (MC68EC000)
SND_HWDEP_IFACE_VX	Digigram VX cards
SND_HWDEP_IFACE_MIXART	Digigram miXart cards
SND_HWDEP_IFACE_USX2Y	Tascam US122, US224 & US428 usb
SND_HWDEP_IFACE_EMUX_WAVETABLE	EmuX wavetable
SND_HWDEP_IFACE_BLUETOOTH	Bluetooth audio
SND_HWDEP_IFACE_USX2Y_PCM	Tascam US122, US224 & US428 raw USB PCM
SND_HWDEP_IFACE_PCXHR	Digigram PCXHR
SND_HWDEP_IFACE_SB_RC	SB Extigy/Audigy2NX remote control
SND_HWDEP_IFACE_HDA	HD-audio
SND_HWDEP_IFACE_USB_STREAM	direct access to usb stream
SND_HWDEP_IFACE_FW_DICE	TC DICE FireWire device
SND_HWDEP_IFACE_FW_FIREWORKS	Echo Audio Fireworks based device
SND_HWDEP_IFACE_FW_BEBOB	BridgeCo BeBoB based device
SND_HWDEP_IFACE_FW_OXFW	Oxford OXFW970/971 based device
SND_HWDEP_IFACE_LAST	last known hwdep interface

snd_hwdep_type_t

enum snd_hwdep_type_t

HwDep handle type

Enumerator
SND_HWDEP_TYPE_HW	Kernel level HwDep
SND_HWDEP_TYPE_SHM	Shared memory client HwDep (not yet implemented)
SND_HWDEP_TYPE_INET	INET client HwDep (not yet implemented)

Function Documentation

snd_hwdep_close()

int snd_hwdep_close

(

snd_hwdep_t *

hwdep

)

close HwDep handle

Parameters

hwdep

HwDep handle

Returns

0 on success otherwise a negative error code

Closes the specified HwDep handle and frees all associated resources.

snd_hwdep_dsp_image_copy()

void snd_hwdep_dsp_image_copy	(	snd_hwdep_dsp_image_t *	dst,
		const snd_hwdep_dsp_image_t *	src
	)

copy one snd_hwdep_dsp_image_t structure to another

Parameters

dst	destination snd_hwdep_dsp_image_t structure
src	source snd_hwdep_dsp_image_t structure

snd_hwdep_dsp_image_free()

void snd_hwdep_dsp_image_free

(

snd_hwdep_dsp_image_t *

info

)

frees the snd_hwdep_dsp_image_t structure

Parameters

info	pointer to the snd_hwdep_dsp_image_t structure to free

Frees the given snd_hwdep_dsp_image_t structure using the standard free C library function.

snd_hwdep_dsp_image_get_image()

const void * snd_hwdep_dsp_image_get_image

(

const snd_hwdep_dsp_image_t *

obj

)

get the image pointer of the DSP block

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure

Returns

the image pointer of the DSP block

snd_hwdep_dsp_image_get_index()

unsigned int snd_hwdep_dsp_image_get_index

(

const snd_hwdep_dsp_image_t *

obj

)

get the DSP block index

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure

Returns

the index of the DSP block

snd_hwdep_dsp_image_get_length()

size_t snd_hwdep_dsp_image_get_length

(

const snd_hwdep_dsp_image_t *

obj

)

get the length of the DSP block

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure

Returns

the length of the DSP block in bytes

snd_hwdep_dsp_image_get_name()

const char * snd_hwdep_dsp_image_get_name

(

const snd_hwdep_dsp_image_t *

obj

)

get the name of the DSP block

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure

Returns

the name string of the DSP block

snd_hwdep_dsp_image_malloc()

int snd_hwdep_dsp_image_malloc

(

snd_hwdep_dsp_image_t **

info

)

allocate a new snd_hwdep_dsp_image_t structure

Parameters

info	returned pointer

Returns

0 on success otherwise a negative error code if fails

Allocates a new snd_hwdep_dsp_image_t structure using the standard malloc C library function.

snd_hwdep_dsp_image_set_image()

void snd_hwdep_dsp_image_set_image	(	snd_hwdep_dsp_image_t *	obj,
		void *	image
	)

set the DSP block image pointer

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure
image	the DSP image pointer

snd_hwdep_dsp_image_set_index()

void snd_hwdep_dsp_image_set_index	(	snd_hwdep_dsp_image_t *	obj,
		unsigned int	index
	)

set the DSP block index

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure
index	the index value to set

snd_hwdep_dsp_image_set_length()

void snd_hwdep_dsp_image_set_length	(	snd_hwdep_dsp_image_t *	obj,
		size_t	length
	)

set the DSP block length

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure
length	the length of the DSP block

snd_hwdep_dsp_image_set_name()

void snd_hwdep_dsp_image_set_name	(	snd_hwdep_dsp_image_t *	obj,
		const char *	name
	)

set the name of the DSP block

Parameters

obj	pointer to a snd_hwdep_dsp_image_t structure
name	the name string

snd_hwdep_dsp_image_sizeof()

size_t snd_hwdep_dsp_image_sizeof

(

void

)

get size of the snd_hwdep_dsp_image_t structure in bytes

Returns

size of the snd_hwdep_dsp_image_t structure in bytes

snd_hwdep_dsp_load()

int snd_hwdep_dsp_load	(	snd_hwdep_t *	hwdep,
		snd_hwdep_dsp_image_t *	block
	)

load the DSP block

Parameters

hwdep	HwDep handle
block	pointer to a snd_hwdep_dsp_image_t structure to transfer

Returns

0 on success otherwise a negative error code

snd_hwdep_dsp_status()

int snd_hwdep_dsp_status	(	snd_hwdep_t *	hwdep,
		snd_hwdep_dsp_status_t *	info
	)

get the DSP status information

Parameters

hwdep	HwDep handle
info	pointer to a snd_hwdep_dsp_status_t structure to be filled

Returns

0 on success otherwise a negative error code

snd_hwdep_dsp_status_copy()

void snd_hwdep_dsp_status_copy	(	snd_hwdep_dsp_status_t *	dst,
		const snd_hwdep_dsp_status_t *	src
	)

copy one snd_hwdep_dsp_status_t structure to another

Parameters

dst	destination snd_hwdep_dsp_status_t structure
src	source snd_hwdep_dsp_status_t structure

snd_hwdep_dsp_status_free()

void snd_hwdep_dsp_status_free

(

snd_hwdep_dsp_status_t *

info

)

frees the snd_hwdep_dsp_status_t structure

Parameters

info	pointer to the snd_hwdep_dsp_status_t structure to free

Frees the given snd_hwdep_dsp_status_t structure using the standard free C library function.

snd_hwdep_dsp_status_get_chip_ready()

unsigned int snd_hwdep_dsp_status_get_chip_ready

(

const snd_hwdep_dsp_status_t *

obj

)

get the chip status of dsp loader

Parameters

obj	pointer to a snd_hwdep_dsp_status_t structure

Returns

non-zero if all DSP blocks are loaded and the chip is ready

snd_hwdep_dsp_status_get_dsp_loaded()

unsigned int snd_hwdep_dsp_status_get_dsp_loaded

(

const snd_hwdep_dsp_status_t *

info

)

get the bit flags of the loaded dsp blocks

Parameters

info	pointer to a snd_hwdep_dsp_status_t structure

Returns

the big flags of the loaded dsp blocks

snd_hwdep_dsp_status_get_id()

const char * snd_hwdep_dsp_status_get_id

(

const snd_hwdep_dsp_status_t *

obj

)

get the driver id of dsp loader

Parameters

obj	pointer to a snd_hwdep_dsp_status_t structure

Returns

the driver id string

snd_hwdep_dsp_status_get_num_dsps()

unsigned int snd_hwdep_dsp_status_get_num_dsps

(

const snd_hwdep_dsp_status_t *

obj

)

get number of dsp blocks

Parameters

obj	pointer to a snd_hwdep_dsp_status_t structure

Returns

number of dsp blocks

snd_hwdep_dsp_status_get_version()

unsigned int snd_hwdep_dsp_status_get_version

(

const snd_hwdep_dsp_status_t *

obj

)

get the driver version of dsp loader

Parameters

obj	pointer to a snd_hwdep_dsp_status_t structure

Returns

the driver version

snd_hwdep_dsp_status_malloc()

int snd_hwdep_dsp_status_malloc

(

snd_hwdep_dsp_status_t **

info

)

allocate a new snd_hwdep_dsp_status_t structure

Parameters

info	returned pointer

Returns

0 on success otherwise a negative error code if fails

Allocates a new snd_hwdep_dsp_status_t structure using the standard malloc C library function.

snd_hwdep_dsp_status_sizeof()

size_t snd_hwdep_dsp_status_sizeof

(

void

)

get size of the snd_hwdep_dsp_status_t structure in bytes

Returns

size of the snd_hwdep_dsp_status_t structure in bytes

snd_hwdep_info()

int snd_hwdep_info	(	snd_hwdep_t *	hwdep,
		snd_hwdep_info_t *	info
	)

get information about HwDep handle

Parameters

hwdep	HwDep handle
info	pointer to a snd_hwdep_info_t structure to be filled

Returns

0 on success otherwise a negative error code

snd_hwdep_info_copy()

void snd_hwdep_info_copy	(	snd_hwdep_info_t *	dst,
		const snd_hwdep_info_t *	src
	)

copy one snd_hwdep_info_t structure to another

Parameters

dst	destination snd_hwdep_info_t structure
src	source snd_hwdep_info_t structure

snd_hwdep_info_free()

void snd_hwdep_info_free

(

snd_hwdep_info_t *

info

)

frees the snd_hwdep_info_t structure

Parameters

info	pointer to the snd_hwdep_info_t structure to free

Frees the given snd_hwdep_info_t structure using the standard free C library function.

snd_hwdep_info_get_card()

int snd_hwdep_info_get_card

(

const snd_hwdep_info_t *

obj

)

get hwdep card number

Parameters

obj	pointer to a snd_hwdep_info_t structure

Returns

hwdep card number

snd_hwdep_info_get_device()

unsigned int snd_hwdep_info_get_device

(

const snd_hwdep_info_t *

info

)

get hwdep device number

Parameters

info	pointer to a snd_hwdep_info_t structure

Returns

hwdep device number

snd_hwdep_info_get_id()

const char * snd_hwdep_info_get_id

(

const snd_hwdep_info_t *

obj

)

get hwdep driver identifier

Parameters

obj	pointer to a snd_hwdep_info_t structure

Returns

hwdep driver identifier

snd_hwdep_info_get_iface()

snd_hwdep_iface_t snd_hwdep_info_get_iface

(

const snd_hwdep_info_t *

obj

)

get hwdep protocol interface

Parameters

obj	pointer to a snd_hwdep_info_t structure

Returns

hwdep protocol interface

snd_hwdep_info_get_name()

const char * snd_hwdep_info_get_name

(

const snd_hwdep_info_t *

obj

)

get hwdep driver name

Parameters

obj	pointer to a snd_hwdep_info_t structure

Returns

hwdep driver name

snd_hwdep_info_malloc()

int snd_hwdep_info_malloc

(

snd_hwdep_info_t **

info

)

allocate a new snd_hwdep_info_t structure

Parameters

info	returned pointer

Returns

0 on success otherwise a negative error code if fails

Allocates a new snd_hwdep_info_t structure using the standard malloc C library function.

snd_hwdep_info_set_device()

void snd_hwdep_info_set_device	(	snd_hwdep_info_t *	obj,
		unsigned int	val
	)

set hwdep device number

Parameters

obj	pointer to a snd_hwdep_info_t structure
val	hwdep device

snd_hwdep_info_sizeof()

size_t snd_hwdep_info_sizeof

(

void

)

get size of the snd_hwdep_info_t structure in bytes

Returns

size of the snd_hwdep_info_t structure in bytes

snd_hwdep_ioctl()

int snd_hwdep_ioctl	(	snd_hwdep_t *	hwdep,
		unsigned int	request,
		void *	arg
	)

do hardware dependent ioctl

Parameters

hwdep	HwDep handle
request	ioctl command
arg	ioctl argument

Returns

0 on success otherwise a negative error code

snd_hwdep_nonblock()

int snd_hwdep_nonblock	(	snd_hwdep_t *	hwdep,
		int	nonblock
	)

set nonblock mode

Parameters

hwdep	HwDep handle
nonblock	0 = block, 1 = nonblock mode

Returns

0 on success otherwise a negative error code

snd_hwdep_open()

int snd_hwdep_open	(	snd_hwdep_t **	hwdep,
		const char *	name,
		int	mode
	)

Opens a new connection to the HwDep interface.

Parameters

hwdep	Returned handle (NULL if not wanted)
name	ASCII identifier of the HwDep handle
mode	Open mode

Returns

0 on success otherwise a negative error code

Opens a new connection to the HwDep interface specified with an ASCII identifier and mode.

snd_hwdep_poll_descriptors()

int snd_hwdep_poll_descriptors	(	snd_hwdep_t *	hwdep,
		struct pollfd *	pfds,
		unsigned int	space
	)

get poll descriptors

Parameters

hwdep	HwDep handle
pfds	array of poll descriptors
space	space in the poll descriptor array

Returns

count of filled descriptors

snd_hwdep_poll_descriptors_count()

int snd_hwdep_poll_descriptors_count

(

snd_hwdep_t *

hwdep

)

get count of poll descriptors for HwDep handle

Parameters

hwdep

HwDep handle

Returns

count of poll descriptors

snd_hwdep_poll_descriptors_revents()

int snd_hwdep_poll_descriptors_revents	(	snd_hwdep_t *	hwdep,
		struct pollfd *	pfds,
		unsigned int	nfds,
		unsigned short *	revents
	)

get returned events from poll descriptors

Parameters

hwdep	HwDep handle
pfds	array of poll descriptors
nfds	count of poll descriptors
revents	returned events

Returns

zero if success, otherwise a negative error code

snd_hwdep_read()

ssize_t snd_hwdep_read	(	snd_hwdep_t *	hwdep,
		void *	buffer,
		size_t	size
	)

read bytes using HwDep handle

Parameters

hwdep	HwDep handle
buffer	buffer to store the input bytes
size	input buffer size in bytes

snd_hwdep_write()

ssize_t snd_hwdep_write	(	snd_hwdep_t *	hwdep,
		const void *	buffer,
		size_t	size
	)

write bytes using HwDep handle

Parameters

hwdep	HwDep handle
buffer	buffer containing bytes to write
size	output buffer size in bytes