Get information about a PCM channel's current capabilities
#include <sys/asoundlib.h> int snd_pcm_channel_info( snd_pcm_t *handle, snd_pcm_channel_info_t *info );
- The handle for the PCM device, which you must have opened by calling snd_pcm_open_name(), snd_pcm_open(), or snd_pcm_open_preferred().
- A pointer to a
structure that snd_pcm_channel_info() fills with information
about the PCM channel.
Before calling this function, set the info structure's channel member to specify the direction. This function sets all the other members.
Use the -l asound option to qcc to link against this library.
The snd_pcm_channel_info() function fills the info structure with the current capabilities of the PCM channel selected by handle.
This function and the plugin-aware version, snd_pcm_plugin_info(), get a dynamic "snapshot" of the system's current capabilities, which can shrink and grow as subchannels are allocated and freed. They're similar to snd_ctl_pcm_channel_info(), which gets information about the complete capabilities of the system.
Zero on success, or a negative error code.
- Invalid handle.
|Thread||Read the Caveats|
This function is not thread safe if handle (snd_pcm_t) is used across multiple threads.
Last modified: 2014-06-24