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 );
- The handle for the PCM device, which you must have opened by calling snd_pcm_open() or snd_pcm_open_preferred() .
- A pointer to a
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.
Use the -l asound option to qcc to link against this library.
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.
- The pcm device state isn't ready.
- Failed to copy data.
- Invalid handle or the data pointer is NULL.
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.