Man page 9 : snd_pcm_hw_constraint_minmax

snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval

int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *  runtime , snd_pcm_hw_param_t  var , unsigned int  min , unsigned int  max );

runtime
    PCM runtime instance

var
    hw_params variable to apply the range

min
    the minimal value

max
    the maximal value

Apply the min/max range constraint to an interval parameter.

Positive if the value is changed, zero if itAqs not changed, or a negative error code.