External PCM plugin SDK

Modules
	External Filter plugin SDK
	External I/O plugin SDK
Files
file	pcm_extplug.c
	External Filter Plugin SDK.
file	pcm_ioplug.c
	I/O Plugin SDK.
Defines
#define	SND_PCM_PLUGIN_ENTRY(name)   _snd_pcm_##name##_open
#define	SND_PCM_PLUGIN_SYMBOL(name)   SND_DLSYM_BUILD_VERSION(SND_PCM_PLUGIN_ENTRY(name), SND_PCM_DLSYM_VERSION);
#define	SND_PCM_PLUGIN_DEFINE_FUNC(plugin)
Functions
int	snd_pcm_parse_control_id (snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp, int *cchannelsp, int *hwctlp)
	Parse control element id from the config.

---

Define Documentation

#define SND_PCM_PLUGIN_DEFINE_FUNC

(

plugin

)

Value:

int SND_PCM_PLUGIN_ENTRY(plugin) (snd_pcm_t **pcmp, const char *name,\
                                  snd_config_t *root, snd_config_t *conf, \
                                  snd_pcm_stream_t stream, int mode)

Define the plugin

#define SND_PCM_PLUGIN_ENTRY

(

name

)

_snd_pcm_##name##_open

Define the object entry for external PCM plugins

#define SND_PCM_PLUGIN_SYMBOL

(

name

)

SND_DLSYM_BUILD_VERSION(SND_PCM_PLUGIN_ENTRY(name), SND_PCM_DLSYM_VERSION);

Define the symbols of the given plugin with versions

---

Function Documentation

int snd_pcm_parse_control_id	(	snd_config_t *	conf,
		snd_ctl_elem_id_t *	ctl_id,
		int *	cardp,
		int *	cchannelsp,
		int *	hwctlp
	)

Parse control element id from the config.

Parameters:

conf

the config tree to parse Parameters: ctl_id  the pointer to store the resultant control element id Parameters: cardp  the pointer to store the card index Parameters: cchannelsp  the pointer to store the number of channels (optional) Parameters: hwctlp  the pointer to store the h/w control flag (optional) Returns: 0 if successful, or a negative error code This function parses the given config tree to retrieve the control element id and the card index. It's used by softvol. External PCM plugins can use this function for creating or assigining their controls. cchannelsp and hwctlp arguments are optional. Set NULL if not necessary.