snd_pcm_hw_param_value (9)

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

params

the hw_params instance

var

parameter to retrieve

dir

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

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