snd_pcm_channel_info()
Get information about a PCM channel's current capabilities
Synopsis:
#include <sys/asoundlib.h> int snd_pcm_channel_info( snd_pcm_t *handle, snd_pcm_channel_info_t *info );
Arguments:
- handle
- The handle for the PCM device, which you must have opened by calling snd_pcm_open() or snd_pcm_open_preferred() .
- info
- A pointer to a
snd_pcm_channel_info_t
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.
Library:
libasound.so
Use the -l asound option to qcc to link against this library.
Description:
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.
Returns:
Zero on success, or a negative error code.
Errors:
- -EINVAL
- Invalid handle.
Classification:
QNX Neutrino
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |