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modem.conf Off-hook improve behavior

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Only restore the old value if it differs from the requested
value, because if it has changed restoring the old value
overrides the change.  Take for example, a voice modem with
a .conf that sets preserve off-hook.  Start playback (on-hook
to off-hook), start record (off-hook to off-hook), stop
playback (off-hook to restore on-hook), stop record (on-hook
to restore off-hook), Clearly you don't want to leave the
modem "on the phone" now that there isn't any playback or
recording active.

Signed-off-by: David Fries <david@fries.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Fries 2009-12-25 14:22:38 -06:00 • committed by Takashi Iwai
parent d3c6e2b097
commit 63acb87329
3 changed files with 24 additions and 1 deletions
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12
src/control/control.c
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@ -2248,6 +2248,18 @@ void snd_ctl_elem_value_copy(snd_ctl_elem_value_t *dst, const snd_ctl_elem_value
*dst = *src;
}
/**
* \brief compare one #snd_ctl_elem_value_t to another
* \param dst pointer to destination
* \param src pointer to source
* \return 0 on match, less than or greater than otherwise, see memcmp
*/
int snd_ctl_elem_value_compare(snd_ctl_elem_value_t *left, const snd_ctl_elem_value_t *right)
{
assert(left && right);
return memcmp(left, right, sizeof(*left));
}
/**
* \brief Get CTL element identifier of a CTL element id/value
* \param obj CTL element id/value