# snd_pcm_ioplug_t Struct Reference
[External I/O plugin SDK]

## Data Fields

unsigned int | version
const char * | name
unsigned int | flags
int | poll_fd
unsigned int | poll_events
unsigned int | mmap_rw
const snd_pcm_ioplug_callback_t * | callback
void * | private_data
snd_pcm_t * | pcm
snd_pcm_stream_t | stream
snd_pcm_state_t | state
volatile snd_pcm_uframes_t | appl_ptr
volatile snd_pcm_uframes_t | hw_ptr
int | nonblock
snd_pcm_access_t | access
snd_pcm_format_t | format
unsigned int | channels
unsigned int | rate
snd_pcm_uframes_t | period_size
snd_pcm_uframes_t | buffer_size

## Detailed Description

Handle of ioplug

I/O plugin handle

## Field Documentation

snd_pcm_access_t snd_pcm_ioplug_t::access

access type; filled after hw_params is called

volatile snd_pcm_uframes_t snd_pcm_ioplug_t::appl_ptr

application pointer; read-only

snd_pcm_uframes_t snd_pcm_ioplug_t::buffer_size

buffer size; filled after hw_params is called

const snd_pcm_ioplug_callback_t* snd_pcm_ioplug_t::callback

callbacks of this plugin; must be filled before calling snd_pcm_ioplug_create()

unsigned int snd_pcm_ioplug_t::channels

number of channels; filled after hw_params is called

unsigned int snd_pcm_ioplug_t::flags

SND_PCM_IOPLUG_FLAG_XXX

snd_pcm_format_t snd_pcm_ioplug_t::format

PCM format; filled after hw_params is called

volatile snd_pcm_uframes_t snd_pcm_ioplug_t::hw_ptr

hw pointer; read-only

unsigned int snd_pcm_ioplug_t::mmap_rw

pseudo mmap mode

const char* snd_pcm_ioplug_t::name

name of this plugin; must be filled before calling snd_pcm_ioplug_create()

int snd_pcm_ioplug_t::nonblock

non-block mode; read-only

snd_pcm_t* snd_pcm_ioplug_t::pcm

PCM handle filled by snd_pcm_extplug_create()

snd_pcm_uframes_t snd_pcm_ioplug_t::period_size

period size; filled after hw_params is called

unsigned int snd_pcm_ioplug_t::poll_events

poll events

int snd_pcm_ioplug_t::poll_fd

poll file descriptor

void* snd_pcm_ioplug_t::private_data

private data, which can be used freely in the driver callbacks

unsigned int snd_pcm_ioplug_t::rate

rate; filled after hw_params is called

snd_pcm_state_t snd_pcm_ioplug_t::state

current PCM state; read-only

snd_pcm_stream_t snd_pcm_ioplug_t::stream

stream direcion; read-only

unsigned int snd_pcm_ioplug_t::version

protocol version; SND_PCM_IOPLUG_VERSION must be filled here before calling snd_pcm_ioplug_create()

The documentation for this struct was generated from the following file:

- /builddir/build/BUILD/alsa-lib-1.1.0/include/pcm_ioplug.h

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