liso_subdev_t Struct Reference
[Sub-devices]

#include <lisodsp.h>

Detailed Description

Sub-Device info.

A sub-device is common part for any opened devices liso_reader_t and liso_writer_t. This structure must be in the first position (offset 0) in these strutures because of the chained-list mechasnisme.

Data Fields

liso_t * lisodsp

Attached lisodsp device.

int status

Current status.

semaphore lock

Lock semaphore.

wait_queue_head_t * sleepyq

Wait queue for sleeping.

wait_queue_head_t * wakeupq

Wait queue for waking up.

int channel

Channel Id.

task_struct * owner

Owner task (device opener).

struct {

   int   ok

bit#0 clear: format needs update

   liso_fmt_desc_t   desc

Current PCM format description.

   const liso_convertor_t *   convertor

Current PCM convertor.

   liso_topcm_t   topcm

to internal convertor

   liso_tofmt_t   tofmt

from internal convertor

   unsigned int   sampling

Current sampling rate (in Hz).

   int   stereo

Current Mono/Stereo flag.

   int   log2pcm

log2 number of byte per PCM

} fmt

Current PCM format informations.

struct {

   int   frag_siz

PCM per frag.

   int   log2pcm

Log2 pcm size.

   liso_topcm_t   topcm

to internal convertor

   liso_tofmt_t   tofmt

from internal convertor

} cur_frag

Current frag info.

struct {

   int   format

Requested PCM format.

   int   stereo

Requested mono/stereo.

   unsigned int   sampling

Requested smpling rate in Hz.

} req_fmt

Requested PCM format changes.

struct {

   int   cnt

Current bytes in buf.

   int   idx

Current index (reader only).

   void *   data

Temporary buffer.

} buf

Temporary buffer for kernel/user-space memory transfert.

int frag_cnt

Frag read or write so far.

int lost_cnt

Frag lost so far.

liso_frags_t frags

Fragments.

Field Documentation

int liso_subdev_t::channel

Channel Id.
For writers : the channel number the writer is binded to.
For readers : always liso_MAX_CHN

struct task_struct* liso_subdev_t::owner

Owner task (device opener).
Currently not for real used only to display task name in procfs info. Anyway may be we could use it later to force sheduler running a task when it really needs it.

struct { ... } liso_subdev_t::req_fmt

Requested PCM format changes.
Actually format changes committed at next read/write operation.

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

lisodsp.h

lisodsp developer documentation
version 0.5.0

Generated on June 2004
by doxygen 1.3.7

liso_subdev_t Struct Reference [Sub-devices]

Detailed Description

Data Fields

Field Documentation

liso_subdev_t Struct Reference
[Sub-devices]