snd_pcm_hw_param_first (9)

int snd_pcm_hw_param_first(struct snd_pcm_substream * pcm, struct snd_pcm_hw_params * params, snd_pcm_hw_param_t var, int * dir);

pcm

PCM instance

params

the hw_params instance

var

parameter to retrieve

dir

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

Inside configuration space defined by params remove from var all values > minimum. Reduce configuration space accordingly.

The minimum, or a negative error code on failure.