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Set the configurable parameters for a PCM channel (plugin-aware)
#include <sys/asoundlib.h>
int snd_pcm_plugin_params(
snd_pcm_t *handle,
snd_pcm_channel_params_t *params );
- handle
- The handle for the PCM device, which you must have opened by calling
snd_pcm_open()
or
snd_pcm_open_preferred().
- params
- A pointer to a
snd_pcm_channel_params_t
structure in which you've specified the PCM channel's configurable
parameters.
All members are write-only.
libasound.so
The snd_pcm_plugin_params() function
sets up the transfer parameters according to params.
You can call the function in SND_PCM_STATUS_NOTREADY
(initial) and SND_PCM_STATUS_READY states; otherwise,
snd_pcm_plugin_params() returns -EBADFD.
If the parameters are valid (i.e. snd_pcm_plugin_params() returns
zero), the driver state is changed to SND_PCM_STATUS_READY.
Zero, or a negative error code.
- -EINVAL
- Invalid handle; the data pointer is NULL, or the format is unsupported.
See the
wave.c example
in the appendix.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
This function is the plugin-aware version of
snd_pcm_channel_params().
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.
snd_pcm_channel_params(),
snd_pcm_channel_params_t,
snd_pcm_channel_setup(),
snd_pcm_open(),
snd_pcm_open_preferred(),
snd_pcm_plugin_setup()
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