[alsa-devel] Support for floating point controls?

Eliot Blennerhassett linux at audioscience.com
Thu Jan 28 00:12:01 CET 2010


some of our products now have control paramters that are 32 bit floating
point values.

I wonder if a patch implementing float ctl elements would be accepted?
Note that the floats are not manipulated in the kernel at all, the
values are just passed through from the hardware to userspace (?)

Adding something like:

#define	SNDRV_CTL_ELEM_TYPE_FLOAT	((__force snd_ctl_elem_type_t) 7)

struct snd_ctl_elem_info {
  union {
	struct {
		float min;		/* R: minimum value */
		float max;		/* R: maximum value */
		float step;		/* R: step (0 variable) */
	} float;

struct snd_ctl_elem_value {
  union {
	union {
		float value[128];
	} float;

Eliot Blennerhassett
AudioScience Inc

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