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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 );
- 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.
libasound.so
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.
- -EINVAL
- Invalid handle.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
snd_ctl_pcm_channel_info(),
snd_pcm_channel_info_t,
snd_pcm_plugin_info()
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