Stream Information

Macros
#define	snd_pcm_info_alloca(ptr)
	allocate an invalid snd_pcm_info_t using standard alloca More...

Functions
size_t	snd_pcm_info_sizeof (void)
	get size of snd_pcm_info_t More...
int	snd_pcm_info_malloc (snd_pcm_info_t **ptr)
	allocate an invalid snd_pcm_info_t using standard malloc More...
void	snd_pcm_info_free (snd_pcm_info_t *obj)
	frees a previously allocated snd_pcm_info_t More...
void	snd_pcm_info_copy (snd_pcm_info_t *dst, const snd_pcm_info_t *src)
	copy one snd_pcm_info_t to another More...
unsigned int	snd_pcm_info_get_device (const snd_pcm_info_t *obj)
	Get device from a PCM info container. More...
unsigned int	snd_pcm_info_get_subdevice (const snd_pcm_info_t *obj)
	Get subdevice from a PCM info container. More...
snd_pcm_stream_t	snd_pcm_info_get_stream (const snd_pcm_info_t *obj)
	Get stream (direction) from a PCM info container. More...
int	snd_pcm_info_get_card (const snd_pcm_info_t *obj)
	Get card from a PCM info container. More...
const char *	snd_pcm_info_get_id (const snd_pcm_info_t *obj)
	Get id from a PCM info container. More...
const char *	snd_pcm_info_get_name (const snd_pcm_info_t *obj)
	Get name from a PCM info container. More...
const char *	snd_pcm_info_get_subdevice_name (const snd_pcm_info_t *obj)
	Get subdevice name from a PCM info container. More...
snd_pcm_class_t	snd_pcm_info_get_class (const snd_pcm_info_t *obj)
	Get class from a PCM info container. More...
snd_pcm_subclass_t	snd_pcm_info_get_subclass (const snd_pcm_info_t *obj)
	Get subclass from a PCM info container. More...
unsigned int	snd_pcm_info_get_subdevices_count (const snd_pcm_info_t *obj)
	Get subdevices count from a PCM info container. More...
unsigned int	snd_pcm_info_get_subdevices_avail (const snd_pcm_info_t *obj)
	Get available subdevices count from a PCM info container. More...
snd_pcm_sync_id_t	snd_pcm_info_get_sync (const snd_pcm_info_t *obj)
	(DEPRECATED) Get hardware synchronization ID from a PCM info container More...
void	snd_pcm_info_set_device (snd_pcm_info_t *obj, unsigned int val)
	Set wanted device inside a PCM info container (see snd_ctl_pcm_info) More...
void	snd_pcm_info_set_subdevice (snd_pcm_info_t *obj, unsigned int val)
	Set wanted subdevice inside a PCM info container (see snd_ctl_pcm_info) More...
void	snd_pcm_info_set_stream (snd_pcm_info_t *obj, snd_pcm_stream_t val)
	Set wanted stream inside a PCM info container (see snd_ctl_pcm_info) More...

Detailed Description

See the PCM (digital audio) interface page for more details.

Macro Definition Documentation

snd_pcm_info_alloca

#define snd_pcm_info_alloca

(

ptr

)

allocate an invalid snd_pcm_info_t using standard alloca

Parameters

ptr	returned pointer

Function Documentation

snd_pcm_info_copy()

void snd_pcm_info_copy	(	snd_pcm_info_t *	dst,
		const snd_pcm_info_t *	src
	)

copy one snd_pcm_info_t to another

Parameters

dst	pointer to destination
src	pointer to source

snd_pcm_info_free()

void snd_pcm_info_free

(

snd_pcm_info_t *

obj

)

frees a previously allocated snd_pcm_info_t

Parameters

obj	pointer to object to free

snd_pcm_info_get_card()

int snd_pcm_info_get_card

(

const snd_pcm_info_t *

obj

)

Get card from a PCM info container.

Parameters

obj	PCM info container

Returns

card number otherwise a negative error code if not associable to a card

snd_pcm_info_get_class()

snd_pcm_class_t snd_pcm_info_get_class

(

const snd_pcm_info_t *

obj

)

Get class from a PCM info container.

Parameters

obj	PCM info container

Returns

class of PCM

snd_pcm_info_get_device()

unsigned int snd_pcm_info_get_device

(

const snd_pcm_info_t *

obj

)

Get device from a PCM info container.

Parameters

obj	PCM info container

Returns

device number

snd_pcm_info_get_id()

const char* snd_pcm_info_get_id

(

const snd_pcm_info_t *

obj

)

Get id from a PCM info container.

Parameters

obj	PCM info container

Returns

short id of PCM

snd_pcm_info_get_name()

const char* snd_pcm_info_get_name

(

const snd_pcm_info_t *

obj

)

Get name from a PCM info container.

Parameters

obj	PCM info container

Returns

name of PCM

snd_pcm_info_get_stream()

snd_pcm_stream_t snd_pcm_info_get_stream

(

const snd_pcm_info_t *

obj

)

Get stream (direction) from a PCM info container.

Parameters

obj	PCM info container

Returns

stream

snd_pcm_info_get_subclass()

snd_pcm_subclass_t snd_pcm_info_get_subclass

(

const snd_pcm_info_t *

obj

)

Get subclass from a PCM info container.

Parameters

obj	PCM info container

Returns

subclass of PCM

snd_pcm_info_get_subdevice()

unsigned int snd_pcm_info_get_subdevice

(

const snd_pcm_info_t *

obj

)

Get subdevice from a PCM info container.

Parameters

obj	PCM info container

Returns

subdevice number

snd_pcm_info_get_subdevice_name()

const char* snd_pcm_info_get_subdevice_name

(

const snd_pcm_info_t *

obj

)

Get subdevice name from a PCM info container.

Parameters

obj	PCM info container

Returns

name of used PCM subdevice

snd_pcm_info_get_subdevices_avail()

unsigned int snd_pcm_info_get_subdevices_avail

(

const snd_pcm_info_t *

obj

)

Get available subdevices count from a PCM info container.

Parameters

obj	PCM info container

Returns

available subdevices count of PCM

snd_pcm_info_get_subdevices_count()

unsigned int snd_pcm_info_get_subdevices_count

(

const snd_pcm_info_t *

obj

)

Get subdevices count from a PCM info container.

Parameters

obj	PCM info container

Returns

subdevices total count of PCM

snd_pcm_info_get_sync()

snd_pcm_sync_id_t snd_pcm_info_get_sync

(

const snd_pcm_info_t *

obj

)

(DEPRECATED) Get hardware synchronization ID from a PCM info container

Parameters

obj	PCM info container

Returns

hardware synchronization ID

snd_pcm_info_malloc()

int snd_pcm_info_malloc

(

snd_pcm_info_t **

ptr

)

allocate an invalid snd_pcm_info_t using standard malloc

Parameters

ptr	returned pointer

Returns

0 on success otherwise negative error code

snd_pcm_info_set_device()

void snd_pcm_info_set_device	(	snd_pcm_info_t *	obj,
		unsigned int	val
	)

Set wanted device inside a PCM info container (see snd_ctl_pcm_info)

Parameters

obj	PCM info container
val	Device number

snd_pcm_info_set_stream()

void snd_pcm_info_set_stream	(	snd_pcm_info_t *	obj,
		snd_pcm_stream_t	val
	)

Set wanted stream inside a PCM info container (see snd_ctl_pcm_info)

Parameters

obj	PCM info container
val	Stream

snd_pcm_info_set_subdevice()

void snd_pcm_info_set_subdevice	(	snd_pcm_info_t *	obj,
		unsigned int	val
	)

Set wanted subdevice inside a PCM info container (see snd_ctl_pcm_info)

Parameters

obj	PCM info container
val	Subdevice number

snd_pcm_info_sizeof()

size_t snd_pcm_info_sizeof

(

void

)

get size of snd_pcm_info_t

Returns

size in bytes