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Add protocl version check

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- Added protocl version check.  The caller of snd_pcm_{io|ext}plug_create()
  must fill version field with SND_PCM_{IO|EXT}PLUG_VERSION beforehand.

- Added poll_descriptors and poll_descriptors_count callbacks for ioplug.
This commit is contained in:
Takashi Iwai 2005-05-18 10:47:52 +00:00
parent 97010dbfdb
commit e61d385993
4 changed files with 80 additions and 1 deletions
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23
include/pcm_ioplug.h
View file

@ -42,8 +42,23 @@ typedef struct snd_pcm_ioplug_callback snd_pcm_ioplug_callback_t;
*/
#define SND_PCM_IOPLUG_FLAG_LISTED (1<<0) /* list up this PCM */
/**
* Protocol version
*/
#define SND_PCM_IOPLUG_VERSION_MAJOR 1
#define SND_PCM_IOPLUG_VERSION_MINOR 0
#define SND_PCM_IOPLUG_VERSION_TINY 0
#define SND_PCM_IOPLUG_VERSION ((SND_PCM_IOPLUG_VERSION_MAJOR<<16) |\
(SND_PCM_IOPLUG_VERSION_MINOR<<8) |\
(SND_PCM_IOPLUG_VERSION_TINY))
/** handle of ioplug */
struct snd_pcm_ioplug {
/**
* protocol version; SND_PCM_IOPLUG_VERSION must be filled here
* before calling #snd_pcm_ioplug_create()
*/
unsigned int version;
/**
* name of this plugin; must be filled before calling #snd_pcm_ioplug_create()
*/
@ -132,6 +147,14 @@ struct snd_pcm_ioplug_callback {
* resume; optional
*/
int (*resume)(snd_pcm_ioplug_t *io);
/**
* poll descriptors count; optional
*/
int (*poll_descriptors_count)(snd_pcm_ioplug_t *io);
/**
* poll descriptors; optional
*/
int (*poll_descriptors)(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int space);
/**
* mangle poll events; optional
*/