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Get information about a PCM channel's capabilities from a control handle
#include <sys/asoundlib.h>
int snd_ctl_pcm_channel_info(
snd_ctl_t *handle,
int dev,
int chn,
int subdev,
snd_pcm_channel_info_t *info );
- handle
- The handle for the control connection to the card.
This must be a handle created by
snd_ctl_open().
- dev
- The PCM device number.
- chn
- The channel direction; either SND_PCM_CHANNEL_CAPTURE or
SND_PCM_CHANNEL_PLAYBACK.
- subdev
- The PCM subchannel.
- info
- A pointer to a
snd_pcm_channel_info_t
structure in which snd_ctl_pcm_channel_info() stores the
information.
libasound.so
The snd_ctl_pcm_channel_info() function
fills the info structure with data about the PCM subchannel
subdev in the PCM channel chn on the sound card
selected by handle.
|
This function gets information about the complete capabilities of the system.
It's similar to
snd_pcm_channel_info()
and
snd_pcm_plugin_info(),
but these functions get a dynamic “snapshot” of the system's
current capabilities, which can shrink and grow as subchannels are
allocated and freed. |
Zero on success, or a negative error code.
- -EINVAL
- Invalid handle.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
snd_ctl_open(),
snd_pcm_channel_info(),
snd_pcm_channel_info_t,
snd_pcm_plugin_info()
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