Hook Extension
[PCM Interface]

Files
file	pcm_hooks.c
	PCM Hook Interface.
Typedefs
typedef enum _snd_pcm_hook_type	snd_pcm_hook_type_t
typedef _snd_pcm_hook	snd_pcm_hook_t
typedef int(*	snd_pcm_hook_func_t )(snd_pcm_hook_t *hook)
Enumerations
enum	_snd_pcm_hook_type { SND_PCM_HOOK_TYPE_HW_PARAMS = 0, SND_PCM_HOOK_TYPE_HW_FREE, SND_PCM_HOOK_TYPE_CLOSE, SND_PCM_HOOK_TYPE_LAST = SND_PCM_HOOK_TYPE_CLOSE }
Functions
snd_pcm_t *	snd_pcm_hook_get_pcm (snd_pcm_hook_t *hook)
	Get PCM handle for a PCM hook.
void *	snd_pcm_hook_get_private (snd_pcm_hook_t *hook)
	Get callback function private data for a PCM hook.
void	snd_pcm_hook_set_private (snd_pcm_hook_t *hook, void *private_data)
	Set callback function private data for a PCM hook.
int	snd_pcm_hook_add (snd_pcm_hook_t **hookp, snd_pcm_t *pcm, snd_pcm_hook_type_t type, snd_pcm_hook_func_t func, void *private_data)
	Add a PCM hook at end of hooks chain.
int	snd_pcm_hook_remove (snd_pcm_hook_t *hook)
	Remove a PCM hook.

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Detailed Description

See the PCM (digital audio) interface page for more details.

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Typedef Documentation

typedef int(* snd_pcm_hook_func_t)(snd_pcm_hook_t *hook)

PCM hook callback function

typedef struct _snd_pcm_hook snd_pcm_hook_t

PCM hook container

typedef enum _snd_pcm_hook_type snd_pcm_hook_type_t

type of pcm hook

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Enumeration Type Documentation

enum _snd_pcm_hook_type

type of pcm hook

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Function Documentation

int snd_pcm_hook_add (  snd_pcm_hook_t **  hookp, snd_pcm_t *  pcm, snd_pcm_hook_type_t  type, snd_pcm_hook_func_t  func, void *  private_data )

Add a PCM hook at end of hooks chain. Parameters: hookp  Returned PCM hook handle pcm  PCM handle type  PCM hook type func  PCM hook callback function private_data  PCM hook private data Returns: 0 on success otherwise a negative error code Warning: an hook callback function cannot remove an hook of the same type different from itself

snd_pcm_t* snd_pcm_hook_get_pcm (  snd_pcm_hook_t *  hook  )

Get PCM handle for a PCM hook. Parameters: hook  PCM hook handle Returns: PCM handle

void* snd_pcm_hook_get_private (  snd_pcm_hook_t *  hook  )

Get callback function private data for a PCM hook. Parameters: hook  PCM hook handle Returns: callback function private data

int snd_pcm_hook_remove (  snd_pcm_hook_t *  hook  )

Remove a PCM hook. Parameters: hook  PCM hook handle Returns: 0 on success otherwise a negative error code Warning: an hook callback cannot remove an hook of the same type different from itself

void snd_pcm_hook_set_private (  snd_pcm_hook_t *  hook, void *  private_data )

Set callback function private data for a PCM hook. Parameters: hook  PCM hook handle private_data  The private data value

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