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Get the runtime status of a PCM channel (plugin aware)
#include <sys/asoundlib.h>
int snd_pcm_plugin_status(
snd_pcm_t *handle,
snd_pcm_channel_status_t *status );
- handle
- The handle for the PCM device, which you must have opened by calling
snd_pcm_open()
or
snd_pcm_open_preferred().
- status
- A pointer to a
snd_pcm_channel_status_t
structure that snd_pcm_plugin_status() fills with information
about the PCM channel's status.
Fill in the status structure's channel member to
specify the direction.
All other members are read-only.
libasound.so
The snd_pcm_plugin_status() function
fills the status structure with runtime status information about
the PCM channel selected by handle.
Zero on success, or a negative error code.
- -EBADFD
- The pcm device state isn't ready.
- -EFAULT
- Failed to copy data.
- -EINVAL
- Invalid handle or the data pointer is NULL.
See the
wave.c example
in the appendix.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
This function is the plugin-aware version of
snd_pcm_channel_status().
It functions exactly the same way.
However, make sure that you don't mix and match plugin- and nonplugin-aware
functions in your application, or you may get undefined
behavior and misleading results.
snd_pcm_channel_status(),
snd_pcm_channel_status_t,
snd_pcm_open(),
snd_pcm_open_preferred()
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