ALSA project - the C library reference

Functions
hwdep.c File Reference

HwDep Interface (hardware dependent) More...

## 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_open_lconf (snd_hwdep_t **hwdep, const char *name, int mode, snd_config_t *lconf)
| Opens a new connection to the HwDep interface using local configuration. More...
int | snd_hwdep_close (snd_hwdep_t *hwdep)
| close HwDep handle More...
const char * | snd_hwdep_name (snd_hwdep_t *hwdep)
| get identifier of HwDep handle More...
snd_hwdep_type_t | snd_hwdep_type (snd_hwdep_t *hwdep)
| get type of HwDep handle 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 (snd_hwdep_t *hwdep, struct pollfd *pfds, unsigned int space)
| get poll descriptors 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...
size_t | snd_hwdep_info_sizeof ()
| get size of the snd_hwdep_info_t structure in bytes More...
int | snd_hwdep_info_malloc (snd_hwdep_info_t **info)
| allocate a new snd_hwdep_info_t structure More...
void | snd_hwdep_info_free (snd_hwdep_info_t *info)
| 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...
int | snd_hwdep_info_get_card (const snd_hwdep_info_t *obj)
| get hwdep card number More...
unsigned int | snd_hwdep_info_get_device (const snd_hwdep_info_t *info)
| get hwdep device 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...
int | snd_hwdep_info (snd_hwdep_t *hwdep, snd_hwdep_info_t *info)
| get information about HwDep handle 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...
int | snd_hwdep_dsp_status (snd_hwdep_t *hwdep, snd_hwdep_dsp_status_t *info)
| 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...
size_t | snd_hwdep_dsp_status_sizeof ()
| get size of the snd_hwdep_dsp_status_t structure in bytes More...
int | snd_hwdep_dsp_status_malloc (snd_hwdep_dsp_status_t **info)
| allocate a new snd_hwdep_dsp_status_t structure More...
void | snd_hwdep_dsp_status_free (snd_hwdep_dsp_status_t *info)
| 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 *info)
| 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 ()
| get size of the snd_hwdep_dsp_image_t structure in bytes More...
int | snd_hwdep_dsp_image_malloc (snd_hwdep_dsp_image_t **info)
| allocate a new snd_hwdep_dsp_image_t structure More...
void | snd_hwdep_dsp_image_free (snd_hwdep_dsp_image_t *info)
| 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...
size_t | snd_hwdep_dsp_image_get_length (const snd_hwdep_dsp_image_t *obj)
| get the length 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...
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_length (snd_hwdep_dsp_image_t *obj, size_t length)
| set the DSP block length More...
void | snd_hwdep_dsp_image_set_image (snd_hwdep_dsp_image_t *obj, void *image)
| set the DSP block image pointer More...

## Detailed Description

HwDep Interface (hardware dependent)

Author
  Jaroslav Kysela perex.nosp@m.@per.nosp@m.ex.cz

Date
  2000-2001

HwDep (hardware dependent) Interface is designed for individual hardware access. This interface does not cover any API specification.

## Function Documentation

## ◆ snd_hwdep_name()

const char * snd_hwdep_name | ( | snd_hwdep_t * | hwdep | ) |

get identifier of HwDep handle

Parameters

  hwdep | a Hwdep handle

Returns
  ascii identifier of HwDep handle

Returns the ASCII identifier of given HwDep handle. It's the same identifier specified in snd_hwdep_open().

## ◆ snd_hwdep_open_lconf()

int snd_hwdep_open_lconf | ( | snd_hwdep_t ** | hwdep,
|  | const char * | name,
|  | int | mode,
|  | snd_config_t * | lconf
| ) |  |

Opens a new connection to the HwDep interface using local configuration.

Parameters

  hwdep | Returned handle (NULL if not wanted)
  name | ASCII identifier of the HwDep handle
  mode | Open mode
  lconf | The local configuration tree

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_type()

snd_hwdep_type_t snd_hwdep_type | ( | snd_hwdep_t * | hwdep | ) |

get type of HwDep handle

Parameters

  hwdep | a HwDep handle

Returns
  type of HwDep handle

Returns the type snd_hwdep_type_t of given HwDep handle.