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pcm_route.c File Reference

PCM Route & Volume Plugin Interface. More...


Functions

int snd_pcm_route_open (snd_pcm_t **pcmp, const char *name, snd_pcm_format_t sformat, int schannels, snd_pcm_route_ttable_entry_t *ttable, unsigned int tt_ssize, unsigned int tt_cused, unsigned int tt_sused, snd_pcm_t *slave, int close_slave)
 Creates a new Route & Volume PCM.

int snd_pcm_route_determine_ttable (snd_config_t *tt, unsigned int *tt_csize, unsigned int *tt_ssize)
 Determine route matrix sizes.

int snd_pcm_route_load_ttable (snd_config_t *tt, snd_pcm_route_ttable_entry_t *ttable, unsigned int tt_csize, unsigned int tt_ssize, unsigned int *tt_cused, unsigned int *tt_sused, int schannels)
 Load route matrix.

int _snd_pcm_route_open (snd_pcm_t **pcmp, const char *name, snd_config_t *root, snd_config_t *conf, snd_pcm_stream_t stream, int mode)
 Creates a new Route & Volume PCM.


Detailed Description

PCM Route & Volume Plugin Interface.

Author:
Abramo Bagnara <abramo@alsa-project.org>
Date:
2000-2001

Function Documentation

int _snd_pcm_route_open snd_pcm_t **    pcmp,
const char *    name,
snd_config_t   root,
snd_config_t   conf,
snd_pcm_stream_t    stream,
int    mode
 

Creates a new Route & Volume PCM.

Parameters:
pcmp  Returns created PCM handle
name  Name of PCM
root  Root configuration node
conf  Configuration node with Route & Volume PCM description
stream  Stream type
mode  Stream mode
Return values:
zero  on success otherwise a negative error code
Warning:
Using of this function might be dangerous in the sense of compatibility reasons. The prototype might be freely changed in future.

int snd_pcm_route_determine_ttable snd_config_t   tt,
unsigned int *    tt_csize,
unsigned int *    tt_ssize
 

Determine route matrix sizes.

Parameters:
tt  Configuration root describing route matrix
tt_csize  Returned client size in elements
tt_ssize  Returned slave size in elements
Return values:
zero  on success otherwise a negative error code

int snd_pcm_route_load_ttable snd_config_t   tt,
snd_pcm_route_ttable_entry_t *    ttable,
unsigned int    tt_csize,
unsigned int    tt_ssize,
unsigned int *    tt_cused,
unsigned int *    tt_sused,
int    schannels
 

Load route matrix.

Parameters:
tt  Configuration root describing route matrix
ttable  Returned route matrix
tt_csize  Client size in elements
tt_ssize  Slave size in elements
tt_cused  Used client elements
tt_sused  Used slave elements
schannels  Slave channels
Return values:
zero  on success otherwise a negative error code

int snd_pcm_route_open snd_pcm_t **    pcmp,
const char *    name,
snd_pcm_format_t    sformat,
int    schannels,
snd_pcm_route_ttable_entry_t *    ttable,
unsigned int    tt_ssize,
unsigned int    tt_cused,
unsigned int    tt_sused,
snd_pcm_t   slave,
int    close_slave
 

Creates a new Route & Volume PCM.

Parameters:
pcmp  Returns created PCM handle
name  Name of PCM
sformat  Slave format
schannels  Slave channels
ttable  Attenuation table
tt_ssize  Attenuation table - slave size
tt_cused  Attenuation table - client used count
tt_sused  Attenuation table - slave used count
slave  Slave PCM handle
close_slave  When set, the slave PCM handle is closed with copy PCM
Return values:
zero  on success otherwise a negative error code
Warning:
Using of this function might be dangerous in the sense of compatibility reasons. The prototype might be freely changed in future.


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