snd_pcm_hw_param_value(9) centos man page | unix.com

SND_PCM_HW_PARAM_VAL(9) 					      PCM API						   SND_PCM_HW_PARAM_VAL(9)

NAME
       snd_pcm_hw_param_value - return params field var value

SYNOPSIS
       int snd_pcm_hw_param_value(const struct snd_pcm_hw_params * params, snd_pcm_hw_param_t var, int * dir);

ARGUMENTS
       params
	   the hw_params instance

       var
	   parameter to retrieve

       dir
	   pointer to the direction (-1,0,1) or NULL

RETURN
       The value for field var if it's fixed in configuration space defined by params. -EINVAL otherwise.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   SND_PCM_HW_PARAM_VAL(9)