snd_pcm_channel

Synopsis:

#include <sys/asoundlib.h>

int snd_pcm_channel_params( 
       snd_pcm_t *handle, 
       snd_pcm_channel_params_t *params );

Arguments:

handle: 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().
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.

Library:

libasound.so

Use the -l asound option to qcc to link against this library.

Description:

The snd_pcm_channel_params() function sets up the transfer parameters according to the params structure.

You can call the function in SND_PCM_STATUS_NOTREADY (initial) and SND_PCM_STATUS_READY states; otherwise, snd_pcm_channel_params() returns -EBADFD.

If the parameters are valid (i.e. snd_pcm_channel_params() returns zero), the driver state is changed to SND_PCM_STATUS_READY.

Note: The ability to convert audio to match hardware capabilities (for example, voice conversion, rate conversion, type conversion, etc.) is enabled by default. As a result, this function behaves as snd_pcm_plugin_params(), unless you've disabled the conversion by calling:

snd_pcm_plugin_set_disable(handle, PLUGIN_CONVERSION);

Returns:

EOK: Success.
-EINVAL: Invalid handle or params.

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes