#include <pcm_ioplug.h>

Data Fields
int(*)	start (snd_pcm_ioplug_t *io)
int(*)	stop (snd_pcm_ioplug_t *io)
snd_pcm_sframes_t(*)	pointer (snd_pcm_ioplug_t *io)
snd_pcm_sframes_t(*)	transfer (snd_pcm_ioplug_t io, const snd_pcm_channel_area_t areas, snd_pcm_uframes_t offset, snd_pcm_uframes_t size)
int(*)	close (snd_pcm_ioplug_t *io)
int(*)	hw_params (snd_pcm_ioplug_t io, snd_pcm_hw_params_t params)
int(*)	hw_free (snd_pcm_ioplug_t *io)
int(*)	sw_params (snd_pcm_ioplug_t io, snd_pcm_sw_params_t params)
int(*)	prepare (snd_pcm_ioplug_t *io)
int(*)	drain (snd_pcm_ioplug_t *io)
int(*)	pause (snd_pcm_ioplug_t *io, int enable)
int(*)	resume (snd_pcm_ioplug_t *io)
int(*)	poll_descriptors_count (snd_pcm_ioplug_t *io)
int(*)	poll_descriptors (snd_pcm_ioplug_t io, struct pollfd pfd, unsigned int space)
int(*)	poll_revents (snd_pcm_ioplug_t io, struct pollfd pfd, unsigned int nfds, unsigned short *revents)
void(*)	dump (snd_pcm_ioplug_t io, snd_output_t out)
int(*)	delay (snd_pcm_ioplug_t io, snd_pcm_sframes_t delayp)
snd_pcm_chmap_query_t *()	query_chmaps (snd_pcm_ioplug_t *io)
snd_pcm_chmap_t ()	get_chmap (snd_pcm_ioplug_t *io)
int(*)	set_chmap (snd_pcm_ioplug_t io, const snd_pcm_chmap_t map)

Detailed Description

Callback table of ioplug

Field Documentation

◆ close

int(*) snd_pcm_ioplug_callback_t::close(snd_pcm_ioplug_t *io)

close the PCM; optional

◆ delay

int(*) snd_pcm_ioplug_callback_t::delay(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp)

get the delay for the running PCM; optional; since v1.0.1

◆ drain

int(*) snd_pcm_ioplug_callback_t::drain(snd_pcm_ioplug_t *io)

drain; optional

◆ dump

void(*) snd_pcm_ioplug_callback_t::dump(snd_pcm_ioplug_t *io, snd_output_t *out)

dump; optional

◆ get_chmap

snd_pcm_chmap_t *(*) snd_pcm_ioplug_callback_t::get_chmap(snd_pcm_ioplug_t *io)

get the channel map; optional; since v1.0.2

◆ hw_free

int(*) snd_pcm_ioplug_callback_t::hw_free(snd_pcm_ioplug_t *io)

hw_free; optional

◆ hw_params

int(*) snd_pcm_ioplug_callback_t::hw_params(snd_pcm_ioplug_t *io, snd_pcm_hw_params_t *params)

hw_params; optional

◆ pause

int(*) snd_pcm_ioplug_callback_t::pause(snd_pcm_ioplug_t *io, int enable)

toggle pause; optional, called inside mutex lock

◆ pointer

snd_pcm_sframes_t(*) snd_pcm_ioplug_callback_t::pointer(snd_pcm_ioplug_t *io)

get the current DMA position; required, called inside mutex lock

Returns: buffer position up to buffer_size or when SND_PCM_IOPLUG_FLAG_BOUNDARY_WA flag is set up to boundary or a negative error code for Xrun

◆ poll_descriptors

int(*) snd_pcm_ioplug_callback_t::poll_descriptors(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int space)

poll descriptors; optional

◆ poll_descriptors_count

int(*) snd_pcm_ioplug_callback_t::poll_descriptors_count(snd_pcm_ioplug_t *io)

poll descriptors count; optional

◆ poll_revents

int(*) snd_pcm_ioplug_callback_t::poll_revents(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int nfds, unsigned short *revents)

mangle poll events; optional

◆ prepare

int(*) snd_pcm_ioplug_callback_t::prepare(snd_pcm_ioplug_t *io)

prepare; optional

◆ query_chmaps

snd_pcm_chmap_query_t **(*) snd_pcm_ioplug_callback_t::query_chmaps(snd_pcm_ioplug_t *io)

query the channel maps; optional; since v1.0.2

◆ resume

int(*) snd_pcm_ioplug_callback_t::resume(snd_pcm_ioplug_t *io)

resume; optional

◆ set_chmap

int(*) snd_pcm_ioplug_callback_t::set_chmap(snd_pcm_ioplug_t *io, const snd_pcm_chmap_t *map)

set the channel map; optional; since v1.0.2

◆ start

int(*) snd_pcm_ioplug_callback_t::start(snd_pcm_ioplug_t *io)

start the PCM; required, called inside mutex lock

◆ stop

int(*) snd_pcm_ioplug_callback_t::stop(snd_pcm_ioplug_t *io)

stop the PCM; required, called inside mutex lock

◆ sw_params

int(*) snd_pcm_ioplug_callback_t::sw_params(snd_pcm_ioplug_t *io, snd_pcm_sw_params_t *params)

sw_params; optional

◆ transfer

snd_pcm_sframes_t(*) snd_pcm_ioplug_callback_t::transfer(snd_pcm_ioplug_t *io, const snd_pcm_channel_area_t *areas, snd_pcm_uframes_t offset, snd_pcm_uframes_t size)

transfer the data; optional, called inside mutex lock

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

/home/lkp/rpmbuild/BUILD/alsa-lib-1.2.16.1/include/pcm_ioplug.h

Data Fields