/builddir/build/BUILD/alsa-lib-1.0.22/src/pcm/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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